HomeMy WebLinkAboutSOUND LEVEL METER MODEL4D
t�arson•Davis
2oee-2s7y7
Sound Wel Meter Model:'720 Serial ` mber: A0106
Log Linearity, Differential Linearity and. Range Data
This Type 2 Sound Level Meter (including integral PRM789 preamplifier and ADPO18 4.7 pF input adapter) was
calibrated with a reference 1 kHz sine wave at a level of 114.0 dBSPL. The instrument's Log Linerarity response
was then electrically tested using a 1 kHz sine wave from 26.5 dBSPL to 146.5 dBSPL in 0.5 dB increments .
2.0
1.7
1.4
1.0
0.7
0.4
Error
(dB) 0.0
-0.4
-0.7
-1.0
i ti - i i i i I i i I i i i ,__1
1.4
1.7
-2.0
30
40 50 60 70 80 90 100
Level (dBSPL)
110 120 130 140 150
Levl
Meas
Err
Levl
Meas
Err
Levl
Meas
Err
Levl
Meas
Err
Levl
Meas
Err
dBSPL
dBSPL
dB
dBSPL
dBSPL
dB
dBSPL
dBSPL
dB
dBSPL
dBSPL
dB
dBSPL
dBSPL
dB
-----
26.5
------
32.2
-----
5.7
-----
47.0
------
47.1
-----
0.1
-----
67.5
------
67.5
-----
0.0
-----
88.0
------
87.9
-----
-0.1
-----
108.5
------
108.4
-----
-0.1
27.0
32.5
5.5
47.5
47.6
0.1
68.0
68.0
0.0
88.5
88.4
-0.1
109.0
108.9
-0.1
27.5
32.5
5.0
48.0
48.1
0.1
68.5
68.5
0.0
89.0
88.9
-0.1
109.5
109.4
-0.1
28.0
32.7
4.7
48.5
48.5
0.0
69.0
69.1
0.1
89.5
89.4
-0.1
110.0
109.9
-0.1
28.5
32.9
4.4
49.0
49.0
0:0
69.5
69.6
0.1
90.0
89.8
-0.2
110.5
110.5
0.0
29.0
33.1
4.1
49.5
49.5
0.0
70.0
70.1
0.1
90.5
90.3
-0.2
111.0
111.0
0.0
29.5
33.1
3.6
50.0
50.0
0.0
70.5
70.6
0.1
91.0
90.8
-0.2
111.5
111.5
0.0
30.0
33.3
3.3
50.5
50.5
0.0
71.0
71.1
0.1
91.5
91.3
-0.2
112.0
112.0
0.0
30.5
33.6
3.1
51.0
51.0
0.0
71.5
71.6
0.1
92.0
91.8
-0.2
112.5
112.5
0.0
31.0
33.6
2.6
51.5
51.6
0.1
72.0
72.1
0.1
92.5
92.3
-0.2
113.0
113.0
0.0
31.5
33.9
2.4
52.0
52.1
0.1
72.5
72.5
0.0
93.0
92.8
-0.2
113.5
113.5
0.0
32.0
34.5
2.5
52.5
52.6
0.1
73.0
73.0
0.0
93.5
93.3
-0.2
114.0
114.0
0A
32.5
34.4
1.9
53.0
53.1
0.1
73.5
73.5
0.0
94.0
93.8
-0.2
114.5
114.5
0.0
33.0
34.9
1.9
53.5
53.6
0.1
74.0
74.0
0.0
94.5
94.4
-0.1
115.0
115.0
0.0
33.5
35.1
1.6
54.0
54.1
0.1
74.5
74.5
0.0
95.0
94.9
-0.1
115.5
115.4
-0.1
34.0
35.3
1.3
54.5
54.7
0.2
75.0
74.9
-0.1
95.5
95.4
-0.1
116.0
115.9
-0.1
34.5
35.8
1.3
55.0
55.2
0.2
75.5
75.4
-0.1
96.0
95.9
-0.1
116.5
116.4
-0.1
35.0
36.1
1.1
55.5
55.7
0.2
76.0
75.9
-0.1
96.5
96.4
-0.1
117.0
116.9
-0.1
35.5
36.4
0.9
56.0
56.2
0.2
76.5
76.4
-0.1
97.0
97.0
0.0
117.5
117.3
-0.2
36.0
36.8
0.8
56.5
56.8
0.3
77.0
76.9
-0.1
97.5
97.5
0.0
118.0
117.8
-0.2
36.5
37.2
0.7
57.0
57.2
0.2
77.5
77.4
-0.1
98.0
98.0
0.0
118.5
118.3
-0.2
37.0
37.6
0.6
57.5
57.6
0.1
78.0
77.9
-0.1
98.5
98.5
0.0
119.0
118.8
-0.2
37.5
38.1
0.6
58.0
58.1
0.1
78.5
78.4
-0.1
99.0
99.0
0.0
119.5
119.3
-0.2
38.0
38.5
0.5
58.5
58.6
0.1
79.0
78.9
-0.1
99.5
99.5
0.0
120.0
119.8
-0.2
38.5
39.0
0.5
59.0
59.1
0.1
79.5
79.4
-0.1
100.0
100.0
0.0
120.5
120.3
-0.2
39.0
39.4
0.4
59.5
59.5
0.0
80.0
79.9
-0.1
100.5
100.5
0.0
121.0
120.8
-0.2
39.5
39.9
0.4
60.0
60.0
0.0
80.5
80.4
-0.1
101.0
101.0
0.0
121.5
121.3
-0.2
40.0
40.3
0.3
60.5
60.5
0.0
81.0
80.9
-0.1
101.5
101.4
-0.1
122.0
121.8
-0.2
40.5
40.9
0.4
61.0
61.0
0.0
81.5
81.5
0.0
102.0
101.9
-0.1
122.5
122.3
-0.2
41.0
41.3
0.3
61.5
61.5
0.0
82.0
82.0
0.0
102.5
102.4
-0.1
123.0
122.8
-0.2
41.5
41.7
0.2
62.0
61.9
-0.1
82.5
82.5
0.0
103.0
102.9
-0.1
123.5
123.4
-0.1
42.0
42.2
0.2
62.5
62.4
-0.1
83.0
83.0
0.0
103.5
103.4
-0.1
124.0
123.9
-0.1
42.5
42.8
0.3
63.0
62.9
-0.1
83.5
83.5
0.0
104.0
103.8
-0.2
124.5
124.4
-0.1
43.0
43.2
0.2
63.5
63.4
-0.1
84.0
84.0
0.0
104.5
104.3
-0.2
125.0
124.9
-0.1
43.5
43.7
0.2
64.0
63.9
-0.1
84.5
84.5
0.0
105.0
104.8
-0.2
125.5
125.4
-0.1
44.0
44.2
0.2
64.5
64.4
-0.1
85.0
85.0
0.0
105.5
105.3
-0.2
126.0
125.9
-0.1
44.5
44.7
0.2
65.0
64.9
-0.1
85.5
85.5
0.0
106.0
105.8
-0.2
126.5
126.5
0.0
45.0
45.2
0.2
65.5
65.4
-0.1
86.0
86.0
0.0
106.5
106.3
-0.2
127.0
127.0
0.0
45.5
45.6
0.1
66.0
65.9
-0.1
86.5
86.5
0.0
107.0
106.8
-0.2
127.5
127.5
0.0
46.0
46.1
0.1
66.5
66.5
0.0
87.0
87.0
0.0
107.5
107.3
-0.2
128.0
128.0
0.0
46.5
46.6
0.1
67.0
67.0
0.0
87.5
87.5
0.0
108.0
107.9
-0.1
128.5
128.4
-0.1
Plotted per typical sensitivity of an M1 3/8" electret microphone; 16.7 mWPa & 4.7 pF.
Overload occurs at 144.3 dBSPL.
Primary indicator range: 107.7 dB (lower limit: 36.5 dBSPL to upper limit: 144.2 dBSPL).
Dynamic range: 112.8 dB (noise floor: 31.4 dBSPL to upper limit: 144.2. dBSPL).
Levl
dBSPL
129.0
129.5
130.0
130.5
131.0
131.5
132.0
132.5
133.0
133.5
134.0
134.5
135.0
135.5
136.0
136.5
137.0
137.5
138.0
138.5
139.0
139.5
140.0
140.5
141.0
141.5
142.0
142.5
143.0
143.5
144.0
144.5
145.0
145.5
146.0
146.5
This instrument is in compliance with IEC 651-1979 7.9 and 7.10, ANSI S1.4-1983 3.2 and
IEC 804-1985 9.2.1 for Type 2 sound level meters when used with a Larson -Davis Type 2 microphone.
Technician: Keith Driskill Test Date: Mar 17, 2000
Meas Err
dBSPL dB
-----
128.9 -0.1
129.4 -0.1
129.9 -0.1
130.4 -0.1
130.9 -0.1
131.3 -0.2
131.8 -0.2
132.3 -0.2
132.8 -0.2
133.3 -0.2
133.8 -0.2
134.3 -0.2
134.8 -0.2
135.3 -0.2
135.8 -0.2
136.3 -0.2
136.9 -0.1
137.4 -0.1
137.9 -0.1
138.4 -0.1
138.9 -0.1
139.5 0.0
140.0 0.0
140.5 0.0
141.0 0.0
141.5 0.0
141.9 -0.1
142.4 -0.1
142.8 -0.2
143.1 -0.4
143.5 -0.5
143.8 -0.7
144.0 -1.0
144.1 -1.4
144.3 -1.7
144.4 -2.1
0
larson•Davis
Sound el Meter Model: 720 Serial mber: A0106
Wei, kited Peak Linearity
This Type 2 Sound Level Meter (including integral PRM789 preamplifier and ADP018 4.7. pF input adapter) was
calibrated with a reference 1 kHz sine wave at a level of 114.0 dBSPL. The instrument's Weighted linearity
response was then electrically tested using a 1 kHz sine wave from 27 dBSPL to 147 dBSPL in 0.5 dB increments .
4.0
2.0
0.0
-2.0
-4.0 30 - 40 50 60 70 80 90 100 110 120 130 140 150
Plotted per typical sensitivity of an M1 3/8" electret microphone;.16.7 mWPa & 4.7 pF:
Technician: Keith Driskill Test Date: Mar 17, 2000
0
Larson•Davis
Sound el Meter Model: 720 Serial umber: A0106
UnWeighted Peak Linearity
This Type 2 Sound Level Meter (including integral PRM789 preamplifier and ADP018 4.7 pF input adapter) was
calibrated with a reference 1 kHz sine wave at a level of 1.14.0 dBSPL. The instrument's UnWeighted linearity
response was then electrically tested using a 1 kHz sine wave from 27 dBSPL to 147 dBSPL in 0.5 dB increments . .
4.0
2.0
0.0
-2.0
-4.0
30 40 50 60, 70 80 90 100 110 120 130 140 150
Plotted per typical sensitivity of an M1 3/8" electret microphone; 16.7 mWPa & 4.7 pF.
Technician: Keith Driskill Test Date: Mar 17, 2000
O
Larson•Davis
Ak
Sound Rvel Meter Model: 720 Serial umber: A0106
Certificate of A -Weight Electrical Conformance
This Type 2 Sound Level Meter (including integral PRM789 preamplifier and ADP018 4.7 pF input adapter) was
calibrated with a reference 1 kHz sine wave at a level of 114.0 dBSPL. The instrument's A -weighted response
was then electrically tested using a 0.5 volt RMS sinewave at exact frequencies as specified in IEC 651-1979
and ANSI S1.4-1983.
5.0
0.0
-5.0
-10.0
-15.0
-20.0
-25.0
-30.0
Level -35.0
(dB)
-40.0
-45.0
-50.0
-55.0
-60.0
-65.0
-70.0
-75.0 `10
31.6 100 316.2 1000
Frequency (Hz)
3162 10000 20000
Freg (Hz)
---------
Theor
-----
Measured
--------
Error
LD Tolerance
Freg (Hz)
Theor
Measured
Error
LD Tolerance
10.00
-70.4
-70.80
-----
-0.40
------------
+1.7,
-4.0
---------
631.00
-----
-1.9
--------
-1.90
-----
0.00
------------
+0.5,
-0.5
12.59
-63.4
-63.50
-0.10
+1.7,
-3.0
794.30
-0.8
-0.90
-0.10
+0.5,
-0.5
15.85
-56.7
-56.90
-0.20
+1.7,
-2.0
1000.00
0.0
0.00
0.00
+0.5,
-0.5
19.95
-50.5
-50.60
-0.10
+1.0,
-1.0
1259.00
0.6
0.60
0.00
+0.5,
-0.5
25.12
-44.7
-45.00
-0.30
+1.0,
-1.0
1585.00
1.0
1.00
0.00
+0.7,
-0.7
31.62
-39.4
-39.50
-0.10
+1.0,
-1.0
1995.00
1.2
1.10
-0.10
+0.7,
-0.7
39.81
-34.6
-34.90
-0.30
+0.7,
-0.7
2512.00
1.3
1.20
-0.10
+0.8,
-0.8
50.12
-30.2
-30.50
-0.30
+0.7,
-0.7
3162.00
1.2
1.10
-0.10
+0.8,
-0.8
63.10
-26.2
-26.30
-0.10
+0.7,
-0.7
3981.00
1.0
0.90
-0.10
+1.0,
-1.0
79.43
-22.5
-22.50
0.00
+0.7,
-0.7
5012.00
0.5
0.40
-0.10
+1.2,
-1.2
100.00
-19.1
-19.30
-0.20
+0.5,
-0.5
6310.00
-0.1
-0.40
-0.30
+1.5,
-1.5
125.00
-16.1
-16.30
-0.20
+0.5,
-0.5
7943.00
-1.1
-1.50
-0.40
+1.7,
-1.7
158.50
-13.4
-13.20
0.20
+0.5,
-0.5
10000.00
-2.5
-2.90
-0.40
+1.7,
-2.0
199.50
-10.9
-10.60
0.30
+0.5,
-0.5
12590.00
-4.3
-4.80
-0.50
+1.7,
-3.0
251.20
-8.6
-8.40
0.20
+0.5,
-0.5
15850.00
-6.6
-7.10
-0.50
+1.7,
-4.0
316.20
-6.6
-6.50
0.10
+0.5,
-0.5
19950.00
-9.3
-10.00
-0.70
+1.7,
-5.0
398.10
-4.8
-4.80
0.00
+0.5,
-0.5
25120.00
-12.4
-13.80
0.00
n/a
n/a
501.20
-3.2
-3.30
-0.10
+0.5,
-0.5
31620.00
-15.8
-18.00
0.00
n/a
n/a
This instrument is in compliance with IEC 651-1979 6.1 and 9.2.2, ANSI S1.4-1983 5.1 and 8.2.1, and
IEC 804-1985 5.1 for Type 2 sound level meters when used with a Larson -Davis Type 2 microphone.
Technician: Keith Driskill Test Date: Mar 17, 2000
0
karson•Davis
Sound el Meter Model: 720 Serial umber: A0106
Certificate of C -Weight Electrical Conformance
This Type 2 Sound Level Meter (including integral PRM789 preamplifier and ADPO18 4.7 pF input adapter) was
calibrated with a reference 1 kHz sine wave at a level of 114.0 dBSPL. The instrument's C -weighted response
was then electrically tested using a 0.5 volt RMS sinewave"at exact frequencies as specified in IEC 651-1979
and ANSI S1.4-1983.
3.0
0.0
-3.0
-6.0
Level -9.o
(dB)
12.0
-15.0
-18.0
-21.0
10
31.6
100
316.2
1000
3162
10000
20000
Frequency (Hz)
Freq (Hz)
---------
Theor
-----
Measured
Error
LD Tolerance
Freq (Hz)
Theor
Measured
Error
LD Tolerance
10.00
-14.3
--------
-14.40
-----
-0.10
------------
+1.7,
-4.0
---------
631.00
-----
0.0
--------
0.20
-----
0.20
------------
+0.5,
-0.5
12.59
-11.2
-11.30
-0.10
+1.7,
-3.0
794.30
0.0
0.20
0.20
+0.5,
-0.5
15.85
-8.5
-8.70
-0.20
+1.7,
-2.0
1000.00
0.0
0.00
0.00
+0.5,
-0.5
19.95
-6.2
-6.50
-0.30
+1.0,
-1.0
1259.00
0.0
-0.10
-0.10
+0.5,
-0.5
25.12
-4.4
-4.60
-0.20
+1.0,
-1.0
1585.00
-0.1
-0.10
0.00
+0.7,
-0.7
31.62
-3.0
-3.20
-0.20
+1.0,
-1.0
1995.00
-0.2
-0.20
0.00
+0.7,
-0.3
39.81
-2.0
-2.10
-0.10
+0.7,
-0.7
2512.00
-0.3
-0.40
-0.10
+0.8,
-0.8
50.12
-1.3
-1.20
0.10
+0.7,
-0.7
3162.00
-0.5
-0.60
-0.10
+0.8,
-0.8
63.10
-0.8
-0.70
0.10
+0.7,
-0.7
3981.00
-0.8
-1.00
-0.20
+1.0,
-1.0
79.43
-0.5
-0.30
0.20
+0.7,
-0.7
5012.00
-1.3
-1.60
-0.30
+1.2,
-1.2
100.00
-0.3
-0.10
0.20
+0.5,
-0.5
6310.00
-2.0
-2.30
-0.30
+1.5,
-1.5
125.00
-0.2
0.00
0.20
+0.5,
-0.5
7943.00
-3.0
-3.50
-0.50
+1.7,
-1.7
158.50
-0.1
0.20
0.30
+0.5,
-0.5
10000.00
-4.4
-5.00
-0.60
+1.7,
-2.0
199.50
0.0
0.30
0.30
+0.5,
-0.5
12590.00
-6.2
-6.80
-0.60
+1.7,
-3.0
251.20
0.0
0.30
0.30
+0.5,
-0.5
15850.00
-8.5
-9.20
-0.70
+1.7,
-4.0
316.20
0.0
0.30
0.30
+0.5,
-0.5
19950.00
-11.2
-12.10
-0.90
+1.7,
-5.0
398.10
0.0
0.30
0.30
+0.5,
-0.5
25120.00
-14.3
-15.70
0.00
n/a
n/a
501.20
0.0
0.20
0.20
+0.5,
-0.5
31620.00
-17.7
-20:10
0.00
n/a
n/a
This instrument is in compliance with IEC 651-1979 6.1 and 9.2.2, ANSI S1.4-19835.1 and 8.2.1, and
IEC 804-1985 5.1 for Type 2 sound level meters when used with a Larson -Davis Type 2 microphone.
Technician: Keith Driskill Test Date: Mar 17, 2000
0
-Larson•Davis
Sound Nvel Meter Model: 720 Serial umber: A010E
Results of Crest Factor Tests
This Type 2 Sound Level Meter (including integral PRM789 preamplifier and ADP018 4.7 pF input adapter) was
calibrated with a reference 1 kHz sine wave at a level of 114.0 dBSPL. The instrument's C -weighted response.
to specific crest factors was then electrically tested as specified in IEC 651-1979 and ANSI S1.4-1983.
***** 200 uSec pulse tests at 2, 12, 22 & 32 dB below upper limit of 144.2 dBSPL *****
This instrument is in compliance with IEC 651-1979 9.4.2 and ANSI S1.4-1983 8.4.2.
Technician: Keith Driskill Test Date: Mar 17, 2000
Pulse
Type 2
Test
OFF
Ref
Pos
Pos
Neg
Neg
Error
Crest
Level
Pulse
Time
Level
Pulse
Pulse
Pulse
Pulse
Tolerance
Factor
dBSPL
VRMS
Ampl
(ms)
dBSPL
Level
Error
Level
Error
Limits
3
142.2
4.3152
14.383
1.8
140.90
OVLD
0.00
OVLD
0.00
+/- 1.0
5
142.2
4.3152
22.439
5.0
140.90
OVLD
0.00
OVLD
0.00
+/- 1.0
3
132.2
1.3646
4.548
1.8
130.90
131.20
0.30
131.00
0.10.
+/- 1.0
5
132.2
1.3646
7.096
5.0
130.90
130.40
-0.50
130.60
-0.30
+/- 1.0
3
122.2
0.4315
1.438
1.8
121.00
121.00
0.00
120.90
-0.10
+/- 1.0
5
122.2
0.4315
2.244
5.0
121.00
'121.10
0.10
121.00
0.00
+/- 1.0
3
112.2
0.1365
0.455
1.8
111.10
110.90
-0.20
110.70
-0.40
+/- 1.0
5
112.2
0.1365
0.710
5.0
111.10
111.20
0.10
111.20
0.10
+/- 1.0
This instrument is in compliance with IEC 651-1979 9.4.2 and ANSI S1.4-1983 8.4.2.
Technician: Keith Driskill Test Date: Mar 17, 2000
0
;Larson•Davis
Sound el Meter Model: 720 Serial umber: A0106
Results of Burst Tests
This Type 2 Sound Level Meter (including integral PRM789 preamplifier and ADPO18 4.7 pF input adapter) was
calibrated with a reference 1 kHz sine wave at a level of 114.0 dBSPL. The instrument's C -weighted response
to specific bursts was then electrically tested as specified in IEC 651-1979 and ANSI S1.4-1983.
*** 2kHz tone burst (rep rate 40Hz) at 2, 12,22 & 32 dB below upper limit of 144.2 dBSPL ***
Test Cont Burst
Crest Level Ref Ampl
Factor dBSPL VRMS VRMS
------ ----- ------ ------
3 142.2 12.8825 27.6330
5 142.2 12.8825 46.0421
3 132.2 4.0738 8.7383
5 132.2 4.0738 14.5598
3 122.2 1.2883 2.7633
5 122.2 1.2883 4.6042
3 112.2 0.4074 0.8718
5 112.2 0.4074 1.4560
Burst
Burst
Type 2
ON
OFF
Ref
Meas
Error
Time
Time
Level
Burst
Burst
Tolerance
(ms)
(ms)
dBSPL
Level
Error
Limits
5.5
19.5
141.00
OVLD
0.00
+/- 1.0
2.0
23.0
141.00
OVLD
0.00,
+/- 1.0
5.5
19.5
131.00
131.40
0.40
+/- 1.0
2.0
23.0
131.00
131.10
0.10
+/- 1.0
5.5
19.5
121.10
121.20
0.10
+/- 1..0
2.0
23.0
121.10
121.30
0.20
+/- 1.0
5.5
19.5
111.20
111.10
-0.10
+/- 1.0
2.0
23.0
111.20
111.50
0.30
+/- 1..0
This instrument is in compliance with IEC 651-1979 9.4.2 and ANSI S1.4-1983 8.4.2.
Technician: Keith Driskill Test Date: Mar 17, 2000
arson• Davis
Sound el Meter Model: 720 Serial umber: A0106
Results of Detector Tests
This Type 2 Sound Level Meter (including integral PRM789 preamplifier and ADPO18 4.7 pF input adapter) was
calibrated with a reference 1 kHz sine wave at a level of 114.0 dBSPL. The instrument's C -weighted Detector
Burst response was. then electrically tested as specified in IEC 651-1979 and ANSI S1.4-1983.
*** Slow detector tests 4,24&44 dB below upper limit of 144.2 dBSPL ***
Test
Ref
Meas
Type 2
Level
Level
Burst
Level
Actual
Theor
Tolerance
dBSPL
dBSPL
Dur (ms)
dBSPL
Diff-
Diff
Error
Limits
-----
140.2
-----
139.50
-----
500.0
-----
135.20
-----
-4.30
-----
-4.10
-----
-0.20
-------
-2.0 2.0
120.2
119.40
500.0
115.00
-4.40
-4.10
-0.30
-2.0 2.0
100.2
99.50
500.0
95.10
-4.40
-4.10
-0.30
-2.0 2.0
*** Fast detector tests 4,24&44 dB below upper limit of 144.2 dBSPL ***
Test
Ref
Meas
Type 2
Level
Level
Burst
Level
Actual
Theor
Tolerance
dBSPL
dBSPL
Dur (ms)
dBSPL
Diff
Diff
Error
Limits
140.2
139.50
200.0
138.00
-1.50
-1.00
-0.50
-2.0 1.0
120.2
119.40
200.0
117.90
-1.50
-1.00
-0.50
-2.0 1.0
100.2
99.50
200.0
97.90
-1.60
-1.00
-0.60
-2.0 1.0
*** Impulse
detector
tests 0,20,&40 dB
below
upper
limit of
144.2 dBSPL ***
Single Burst
Tests
Test
Ref
Meas
Type 2
Level
Level
Burst
Level
Actual
Theor
Tolerance
dBSPL
dBSPL
Dur (ms).dBSPL
Diff
Diff
Error
Limits
144.2
142.60
20.0
138.60
-4.00
-3.60
-0.40
-2.0 2.0
144.2
142.60
5.0
133.50
-9.10
-8.80
-0.30
.-3.0 3.0
144.2
142.60
2.0
130.40
-12.20
-12.60
0.40
n/a n/a
124.2
123.50
20.0
119.50
-4.00
-3.60
-0.40
-2.0 2.0
124.2
123.50
5.0
114.00
-9.50
-8.80
-0.70
-3.0 3.0
124.2
123.50
2.0
110.40
-13.10
-12.60
-0.50
n/a n/a
104.2
103.20
20.0
99.20
-4.00
-3.60
-0.40
;-2.0 2.0
10.4.2
103.20
5.0
94.00
-9.20
-8.80
-0.40
,-3.0 3.0
104.2
103.20
2.0
89.50
-13.70
-12.60
-1.10
n/a n/a
*** Impulse
detector
tests 0,20,&40 dB
below
upper
limit of
144.2 dBSPL ***
Repetitive
Burst
Tests
Test
Ref
Meas
Type 2
Level
Level
Repeat
Level
Actual
Theor
Tolerance
dBSPL
dBSPL
Frq (Hz)
dBSPL
Diff
Diff
Error
Limits
-----
144.2
-----
142.60
-----
100.0
-----
139.90
-----
-2.70
-----
-2.70
-----
-0.00
-------
-1.0 1.0
144.2
142.60
20.0
135.00
-7.60
-7.60
-0.00
-2.0.2.0
144.2
142.60
2.0
133.60
-9.00
-8.80
-0.20
-3.0 3.0
124.2
123.50
.100.0
120.70
-2.80
-2.70
-0.10
-1.0 1.0
124.2
123.50
20.0
115.90
-7.60
-7.60
0.00
.-2.0 2.0
124.2
123.50
2.0
114.50
-9.00
-8.80
-0.20
-3.0 3.0
104.2
103.20
100.0
100.60
-2.60
-2.70
0.10
-1.0 1.0
104.2
103.20
20.0
95.60
-7.60
-7.60
0.00
-2.0 2.0
104.2
103.20
2.0
94.20
-9.00
-8.80
-0.20
-3.0 3.0
This instrument is in compliance with IEC 651-1979 9.4.2 and ANSI S1.4-19838.4.2.
Technician: Keith Driskill Test Date: Mar 17, 2000
O
iarson•Davis
Sound Wel Meter Model: 720 Serial umber: A0106
Summary Test Data
dB Offset (added to dBuV readings for dBSPL): 9.5
NoiseFloor: 21.9 (31.4 SPL)
Overload: 134.8 (144.3 SPL)
LogLin Reference: 104.7 (114.2 SPL)
Weighted Peak Reference: 107.4 (116.9 SPL)
Unweighted Peak Reference: 107.6 (117.1 SPL)
Overload: 134.8 (144.3 SPL)
LowerRange (max (noisefloor, w/in limits, w/in diff linearity)): 27.0'(36.5 SPL)
UpperRange (min (overload, w/in limits, w/in diff linearity)):.134.7 (144.2 SPL)
UpperLimit (Overload - 0.1): 134.7 (144.2 SPL)
Primary indicator range: 107.7 dB (Minimum Allowed: 103.0)
Dynamic range: 112.8 dB (Minimum Allowed: 110.0)
LogLin Test Run Date: Fri Mar 17 09:17:21 2000. Passed
A Weight Test Run Date: Fri Mar 17 09:34:48 2000. Passed
C Weight Test Run Date: Fri Mar 17 09:36:26 2000. Passed
Crest Test Run Date: Fri Mar 17 09:38:01 2000. Passed
Burst Test Run Date: Fri Mar 17 09:40:46 2000. Passed
Detector Test Run Date: Fri Mar 17 09:44:27 2000. Passed
From: Richard Craig To: Brian Larsen
• Date: 03/08/2000 Time: J52 AM
Page 2 of'
LARSON DAVIS LABS
.1681 W. 820 N. VOID AFTER 30 DAYS UNLESS OTHERWISE
NOTIFIED AND SUBJECT TO ALL CONDITIONS ON
Provo, UT 84601 THE FACE AND SUPPLEMENTS OF THIS
Ph: 801-375-0177 QUOTATION
TERMS: Net 30 Days pending credit approval
Fax: 801-375-0182 F.O.B CARSON 3*
IS
Unless Otherwise Stated
Date
3/8/2000 Quote No., 5003056
�� FOR FURTHER INFORMATION CONTACT:BUTTE CO. DEV. SVCS. CEIV 7 Count Center RERichard Craig
Y Drive Z� LARSON DAVIS,
Oroville , CA 95965 '1'089 4th Ave.
BUTTE COUNTY Napa, CA 94559
DEPpgTME sER�ICEs Ph: 707-265-7885
Attn. Brian Larsen DEVSLOPMENT Fax-. 707-265-7886
ItemQty Model No.
DescriptionDelivery
DEMONSTRATION EQUIPMENT: _
Unit Price Price Days ARO
-
#720 Environmental Logging Sound Level Meter
1 1 720
2 1. DISCOUNT
-----------------------------------------------------------_----
SOUND LEVEL METER, T2, EXCEDNCE,, W/SOFT
`DISCOUNT, DEMONSTRATION
1,980.00 , 1 980.00 30
EQUIPMENT,' -30%
-594.00 -594.00 30
OPTIONAL
3 1 CAL150 .
4 1 CBL038
--------------------------------------=-------------------------
CALIBRATOR, 3/8" or 1/4", 94-114dB, 1kHz, T2
300.00 300.OQ 30
CABLE, INTERFACE, RS -232 & PWR ( ) 820 to PC
55.00 55.00
30-
0-NOTES:
NOTES,1. Demonstration Equip. is sold on a first-come
first-served basis and may not be available.
2. Demonstration Equip. carries a 1 year
warranty. (instead of.2 yr. as new).
3_ Demonstration Equip. may have minor
cosmetic flaws (not affecting operation).
4. Demonstration Equip. is guaranteed to
meet published specifications at date,of mfg_
Quote Totalo
$1,741.00
Important:
When favored with a purchase order,
please refer,to LDL Quote # 5003056
Phone # 530-538-7464
Fax # 530-538-7470
LARSON DAVIS assumes no responsibility
any error, inaccuracy or ommission appearing
herein.
Buy Date Code
50 / 500 / E
76#, b6 S,62 OP � 'Gt.Llnn.c,,A
From: Richard Craig To: Brian Larsen
Date: 03/08/2000 Time: 11:21,52 AM
' • • Page 1 of 2
LARSON DAVIS
Tel: 707-265-7885
Fax: 707-265-7886
To: Brian Larsen From: Richard Craig
Fax #: 1,530-538-7470
Company: BUTTE CO. DEV. SVCS.
Subject: PROPOSAL ON SOUND LEVEL METER
Sent: 03/08/2000 at 8:21:50 AM Pages: 2 (including cover)
MESSAGE:
Brian
Attached find a proposal outlining the Sound Level Meter (Type 720) we discussed yesterday. We do
have two used units on the shelf that have a 30% discount. The 720 is a "type 2" meter and if you can
get the calibrator (Type CAL150)_you can quickly check the meter at 94 dB or 114 dB. The meter can
be left out overnight (or longer) and will automatically store measurements at user defined periods (like
every hour on the hour). The data is easily downloaded into your PC via its comm port with the "free"
utility software (included). Normally "excel" (or other spreadsheet software) is used to view the level
against time. The meter is small and easy to use and I'm sure it will be a usful tool in your planning
department.
Thahks and regards, -RE- ED _
Richard Craig �j��, �l
BUTTE COUNTY
DE DEP LopE ENT
SF,RVICEc
Win Fax PRO Cover Page
r
///////�-a:•::+f�'a4:>.�::ai.V.=vt>.�::J'4�.��_::.�:%^c.\�.�_—�ti::.�._�..N.._�^--•�vS:���i4':i`...�'—�.'\it..—._i•:v!•!_=-.hi5't+_� ..%�'v.�.vc:�_..L
Certificate of Calibration and Conformance r f
Certificate Number 2000-25747 '
Instrument Model 720; Serial Number 0106, was calibrated 'on 03717-2000. The
instrument meets factory specifications according to Larson ' Davis. Test
Procedure TP -1021, ISO 10012, ANSI S1.4 1983, IEC 651 -Type 2 1979, and -
IEC 804 -Type 2.1985.
�( Instrument found to be in calibration as received: YES s '
Date Calibrated: 03-17-2000 `
Calibration due: 03-17-2001
Calibration Standards Used
MAKH1FACTIIRFR Mr)r1F1 RGRIAI A11111ARFA IAITCA\/AI rA I IMC TDA!`CAQII ITV win
Certified Reference Standards are traceable to the National Institute of Standards and Technology (NIST) '
Calibration Environmental Conditions
Temperature: 24 ° Centigrade Relative. Humidity: 21 %
Affirmations
This Certificate attests that this instrument has.been calibrated under the stated conditions with Measurement and Test -
Equipment (MBTE) Standards traceable to the National Institute of Standards and Technology (NIST)., All of the Measurement'
Standards have been calibrated to their manufacturers' specified accuracy / uncertainty. Evidence of traceability and accuracy
is on file at Larson • Davis Corporate Headquarters. An acceptable accuracy ratio between the Standard(s) and the item
calibrated has been maintained. This instrument meets or exceeds the manufacturer's published specification unless noted.
This calibration complies with ISO 10012. The collective uncertainty of the Measurement Standard used does not exceed 25_%
of the applicable tolerance for each characteristic calibrated unless otherwise noted.
Due to state-of-the-art limitations, 4:1 calibration ratios are not possible on pressure measurement standards, microphones
and acoustic calibrators. Calibration ratios for these types of devices are limited to 1:1. F
The results documented in this certificate relate only to the item(s) calibrated or tested. Calibration interval assignment and
adjustment are the responsibility of the end user. This certificate may not be reproduced, except in full, without the written
approval of Larson • Davis Laboratories. r
A
Technician: Keith Driskill r
Service Center: Larson • Davis Laboratories, Utah Signed:
LARSON • DAVIS LABORATORIES
• 1681 West 820 North Provo; Utah • 84601 Phone (801)'375-0177
.: • if, ..
Larson • Davis
910B
0304
12 Months
04/14/2000
1999-19637
Larson • Davis
900B
2178
12 Months
04/14/2000.
1999-19636
Larson • Davis
2900
290DA0522
12 Months
08/05/2000
1999-21485
Larson • Davis
2559
2108
12 Months
11/29/2000
1999-23614
r
Larson • Davis
2540
1615
12 Months
11 /29/2000
1999-23615
Larson • Davis
LDSi Gnr2209
0277/0109
12 Months
01/25/2001
2000-24798
Certified Reference Standards are traceable to the National Institute of Standards and Technology (NIST) '
Calibration Environmental Conditions
Temperature: 24 ° Centigrade Relative. Humidity: 21 %
Affirmations
This Certificate attests that this instrument has.been calibrated under the stated conditions with Measurement and Test -
Equipment (MBTE) Standards traceable to the National Institute of Standards and Technology (NIST)., All of the Measurement'
Standards have been calibrated to their manufacturers' specified accuracy / uncertainty. Evidence of traceability and accuracy
is on file at Larson • Davis Corporate Headquarters. An acceptable accuracy ratio between the Standard(s) and the item
calibrated has been maintained. This instrument meets or exceeds the manufacturer's published specification unless noted.
This calibration complies with ISO 10012. The collective uncertainty of the Measurement Standard used does not exceed 25_%
of the applicable tolerance for each characteristic calibrated unless otherwise noted.
Due to state-of-the-art limitations, 4:1 calibration ratios are not possible on pressure measurement standards, microphones
and acoustic calibrators. Calibration ratios for these types of devices are limited to 1:1. F
The results documented in this certificate relate only to the item(s) calibrated or tested. Calibration interval assignment and
adjustment are the responsibility of the end user. This certificate may not be reproduced, except in full, without the written
approval of Larson • Davis Laboratories. r
A
Technician: Keith Driskill r
Service Center: Larson • Davis Laboratories, Utah Signed:
LARSON • DAVIS LABORATORIES
• 1681 West 820 North Provo; Utah • 84601 Phone (801)'375-0177
.: • if, ..
4D
Larson•Davis
SoundTevel Meter Model: 720 Seria umber: A0106
Log Linearity, Differential Linearity and Range Data
This Type 2 Sound Level Meter (including integral PRM789 preamplifier and ADPO18 4.7 pF input adapter) was
calibrated with a reference 1 kHz sine wave at a level of 114.0 dBSPL. The instrument's Log Linerarity response
was then electrically tested using a 1 kHz sine wave from 26.5 dBSPL to 146.5 dBSPL in 0.5 dB increments .
2.0
1.7
1.4
1.0
0.7
0.4
Error
(dB) 0.0
-0.4
-0.7
-1.0
I I I I I I I__\ - V-1 11- I
mi
-2.0'-
30
40 50 60 70 80 90 100 110 120 130
Level (dBSPL)
140 150
Levl
Meas
Err
Levl
Meas
Err
Levl
Meas
Err'
Levl
Meas
Err
Levl
Meas
Err
Levl
Meas
Err
dBSPL
-----
dBSPL
------
dB
-----
dBSPL
-----
dBSPL
------
dB
-----
dBSPL
-----
dBSPL
------
dB
dBSPL
dBSPL
dB
dBSPL
dBSPL
dB
dBSPL
dBSPL
dB
26.5
32.2
5.7
47.0
47.1
0.1
67.5
67.5
-----
0.0
-----
88.0
------
87.9
-----
-0.1
-----
108.5
------
108.4
-----
-0.1
-----
129.0
------
128.9
-----
-0.1
27.0
32.5
5.5
47.5
47.6
0.1
68.0
68.0
0.0
88.5
88.4
-0.1
109.0
108.9
-0.1
129.5
129.4
-0.1
27.5
32.5
5.0
48.0
48.1
0.1
68.5
68.5
0.0
89.0
88.9
-0.1
109.5
109.4
-0.1
130.0
129.9
-0.1
28.0
32.7
4.7
48.5
48.5
0.0
69.0
69.1
0.1
89.5
89.4
-0.1
110.0
109.9
-0.1
130.5
130.4
-0.1
28.5
32.9
4.4
49.0
49.0
0.0
69.5
69.6
0.1
90.0
89.8
-0.2
110.5
110.5
0.0
131.0
130.9
-0.1
29.0
33.1
4.1
49.5
49.5
0.0
70.0
70.1
0.1
90.5
90.3
-0.2
111.0
111.0
0.0
131.5
131.3
-0.2
29.5
33.1
3.6
50.0
50.0
0.0
70.5
70.6
0.1
91.0
90.8
-0.2
111.5
111.5
0.0
132.0
131.8
-0.2
30.0
33.3
3.3
50.5
50.5
0.0
71.0
71.1
0.1
91.5
91.3
-0.2
112.0
112.0
0.0
132.5
132.3
-0.2
30.5
33.6
3.1
51.0
51.0
0.0
71.5
71..6
0.1
92.0
91.8
-0.2
112.5
112.5
0.0
133.0
132.8
-0.2
31.0
33.6
2.6
51.5
51.6
0.1
72.0
72.1
0.1
92.5
92.3
-0.2
113.0
113.0
0.0
133.5
133.3
-0.2
31.5
33.9
2.4
52.0
52.1
0.1
72.5
72.5
0.0
93.0
92.8
-0.2
113.5
113.5
0.0
134.0
133.8
-0.2
32.0
34.5
2.5
52.5
52.6
0.1
73.0
73.0
0.0
93.5
93.3
-0.2
114.0
114.0
0.0
134.5
134.3
-0.2
32.5
34.4
1.9
53.0
53.1
0.1
73.5
73.5
0.0
94.0
93.8
-0.2
114.5
114.5
0.0
135.0
134.8
-0.2
33.0
34.9
1.9
53.5
53.6
0.1
74.0
74.0
0.0
94.5
94.4
-0.1
115.0
115.0
0.0
135.5
135.3
-0.2
33.5
35.1
1.6
54.0
54.1
0.1
74.5
74.5
0.0
95.0
94.9
-0.1
115.5
115.4
-0.1
136.0
135.8
-0.2
34.0
35.3
1.3
54.5
54.7
0.2
75.0
74.9
-0.1
95.5
95.4
-0.1
116.0
115.9
-0.1
136.5
136.3
-0.2
34.5
35.8
1.3
55.0
55.2
0.2
75.5
75.4
-0.1
96.0
95.9
-0.1
116.5
116.4
-0.1
137.0
136.9
-0.1
35.0
36.1
1.1
55.5
55.7
0.2
76.0
75.9
-0.1
96.5
96.4
-0.1
117.0
116.9
-0.1
137.5
137.4
-0.1
35.5
36.4
0.9
56.0
56.2
0.2
76.5
76.4
-0.1
97.0
97.0
0.0
117.5
117.3
-0.2
138.0
137.9
-0.1
36.0
36.8
0.8
56.5
56.8
0.3
77.0
76.9
-0.1
97.5
97.5
0.0
118.0
117.8
-0.2
138.5
.138.4
-0.1
36.5
37.2
0.7
57.0
57.2
0.2
77.5
77.4
-0.1
98.0
98.0
0.0
118.5
118.3
-0.2
139.0
138.9
-0.1
37.0
37.6
0.6
57.5
57.6
0.1
78.0
77.9
-0.1
98.5
98.5
0.0
119.0
118.8
-0.2
139.5
139.5
0.0
37.5
38.1
0.6
58.0
58.1
0.1
78.5
78.4
-0.1
99.0
99.0
0.0
119.5
119.3
-0.2
140.0
140.0
0.0
38.0
38.5
0.5
58.5
58.6
0.1
79.0
78.9
-0.1
99.5
99.5
0.0
120.0
119.8
-0.2
140.5
140.5
0.0
38.5
39.0
0.5
59.0
59.1
0.1
79.5
79.4
-0.1
100.0
100.0
0.0
120.5
120.3
-0.2
141.0
141.0
0.0
39.0
39.4
0.4
59.5
59.5
0.0
80.0
79.9
-0.1
100.5
100.5
0.0
121.0
120.8
-0.2
141.5
141.5
0.0
39.5
39.9
0.4
60.0
60.0
0.0
80.5
80.4
-0.1
101.0
101.0
0.0
121.5
121.3
-0.2
142.0
141.9
-0.1
40.0
40.3
0.3
60.5
60.5
0.0
81.0
80.9
-0.1
101.5
101.4
-0.1
122.0
121.8
-0.2
142.5
142.4
-0.1
40.5
40.9
0.4
61.0
61.0
0.0
81.5
81.5
0.0
102.0
101.9
-0.1
122.5
122.3
-0.2
143.0
142.8
-0.2
41.0
41.3
0.3
61.5
61.5
0.0
82.0
82.0
0.0
102.5
102.4
-0.1
123.0
122.8
-0.2
143.5
143.1
-0.4
41.5
41.7
0.2
62.0
61.9
-0.1
82.5
82.5
0.0
103.0
102.9
-0.1
123.5
123.4
-0.1
144.0
143.5
-0.5
42.0
42.2
0.2
62.5
62.4
-0.1
83.0
83.0
0.0
103.5
103.4
-0.1
124.0
123.9
-0.1
144.5
143.8
-0.7
42.5
42.8
0.3
63.0
62.9
-0.1
83.5
83.5
0.0
104.0
103.8
-0.2
124.5
124.4
-0.1
145.0
144.0
-1.0
43.0
43.2
0.2
63.5
63.4
-0.1
84.0
84.0
0.0
104.5
104.3
-0.2
125.0
124.9
-0.1
145.5
144.1
-1.4
43.5
43.7
0.2
64.0
63.9
-0.1
84.5
84.5
0.0
105.0
104.8
-0.2
125.5
125.4
-0.1
146.0
144.3
-1.7
44.0
44.2
0.2
64.5
64.4
-0.1
85.0
85.0
0.0
105.5
105.3
-0.2
126.0
125.9
-0.1
146.5
144.4
-2.1
44.5
44.7
0.2
65.0
64.9
-0.1
85.5
85.5
0.0
106.0
105.8
-0.2
126.5
126.5
0.0
45.0
45.2
0.2
65.5
65.4
-0.1
86.0
86.0
0.0
106.5
106.3
-0.2
127.0
127.0
0.0
45.5
45.6
0.1
66.0
65.9
-0.1
86.5
86.5
0.0
107.0
106.8
-0.2
127.5
127.5
0.0
46.0
46.1
0.1
66.5
66.5
0.0
87.0
87.0
0.0
107.5
107.3
-0.2
128.0
128.0
0.0
46.5
46.6
0.1
67.0
67.0
0.0
87.5
87.5
0.0
108.0
107.9
-0.1
128.5
128.4
-0.1
Plotted per typical sensitivity of an M1 3/8" electret microphone; 16.7 mWPa & 4.7 pF.
Overload occurs at 144.3 dBSPL.
Primary indicator range: 107.7 dB (lower limit: 36.5 dBSPL to upper limit: 144.2 dBSPL).
Dynamic range: 112.8 dB (noise floor: 31.4 dBSPL to upper limit: 144.2 dBSPL).
This instrument is in compliance with IEC 651-1979 7.9 and 7.10, ANSI S1.4-1983 3.2 and
IEC 804-1985 9.2.1 for Type 2 sound level meters when used with a Larson -Davis Type 2 microphone.
Technician: Keith Driskill Test Date: Mar 17, 2000
0
Larson•Davis
Sound evel Meter Model: 720 Seria umber: A0106
Certificate of A -Weight Electrical Conformance
This Type 2 Sound Level Meter (including integral PRM789 preamplifier and ADPO18 4.7 pF input adapter) was
calibrated with a reference 1 kHz sine wave at a level of 114.0 dBSPL. The instrument's A -weighted response
was then electrically tested using a 0.5 volt RMS sinewave at exact frequencies as specified in IEC 651-1979
and ANSI S1.4-1983.
5.0
0.0
-5.0
-10.0
-15.0
-20.0
-25.0
-30.0
Level -35.0
(dB)
-40.0
-45.0
-50.0
-55.0
-60.0
-65.0
-70.0
-750
10
31.6 =.
100
316.2
1000
3162
10000
20000
Frequency (Hz)
Freq (Hz)
Theor
Measured
Error
LD Tolerance
Freq (Hz)
Theor
Measured Error
LD Tolerance
---------
10.00
-----
-70.4
--------
-70:80
-----
-0.40
------------
+1.7,
-4.0
---------
631.00
-----
-1.9
--------
-1.90
-----
0.00
------------
+0.5,
-0.5
12.59
-63.4
-63:50
-0.10
+1.7,
-3.0
794.30
-0.8
-0.90
-0.10
+0.5,
-0.5
15.85
-56.7
-56.90
-0.20
+1.7,
-2.0
1000.00
0.0
0.00
0.00
+0.5,
-0.5
19.95
-50.5
-50'.60
-0.10
+1.0,
-1.0
1259.00
0.6
0.60
0.00
+0.5,
-0.5
25.12
-44.7
-45.00
-0.30
+1.0,
-1.0
1585.00
1.0
1.00
0.00
+0.7,
-0.7
31.62
-39.4
-39.50
-0.10
+1.0,
-1.0
1995.00
1.2
1.10
-0.10
+0:7,
-0.7
39.81
-34.6
-34.90
-0.30
+0.7,
-0.7
2512.00
1.3
1.20
-0.10
+0.8,
-0.8
50.12
-30.2
-30.50
-0.30
+0.7,
-0.7
3162.00
1.2
1.10
-0.10
+0.8,
-0.8
63.10
-26.2
-26.30
-0.10
+0.7,
-0.7
3981.00
1.0
0.90
-0.10
+1.0,
-1.0
79.43
-22.5
-22.50
0.00
+0.7,
-0.7
5012.00
0.5
0.40
-0.10
+1.2,
-1.2
100.00
-19.1
-19.30
-0.20
+0.5,
-0.5
6310.00
-0.1
-0.40
-0.30
+1.5,
-1.5
125.00
-16.1
-16:30
-0.20
+0.5,
-0.5
7943.00
-1.1
^-1.50
-0.40
-1.7
158:50
-13.4
-13.20
0.20
+0.5,
-0.5
10000.00
-2.5
-2.90
-0.40
1+1.7,
+1.7,
-2.0
199.50
-10.9
-10.60
0.30
+0.5,
-0.5
12590.00
-4.3
-4.80
-0.50
+1.7,
-3.0
251.20
-8.6
-8.40
0.20
+0.5,
-0.5
15850.00
-6.6
-7.10
-0.50
+1.7,
-4.0
316:20
-6.6
-6.50
0.10
+0.5,
-0.5
19950.00
-9.3
-10.00
-0.70
+1.7,
-5.0
398.10
-4.8
-4.80
0.00
+0.5,
-0.5
25120.00
-12.4
-13.80
0.00
n/a
n/a
501.20
-3.2
-3.30
-0.10
+0.5,
-0.5
31620.00
-15.8
-18.00
0.00
n/a
n/a
This instrument is in compliance
with IEC
651-1979 6.1
and 9.2.2,
ANSI S1.4-1983
5.1 and
8.2.1, and
IEC 804-1985
5.1 for Type 2 sound level meters when
used with a
Larson
-Davis Type 2 microphone.
Technician: Keith Driskill Test Date: Mar 17, 2000
0
Larson•Davis
Sound evel Meter Model: 720 Seria umber: A0106
Certificate of C -Weight Electrical Conformance
This Type 2 Sound Level Meter (including integral PRM789 preamplifier and ADP018 4.7 pF input adapter) was
calibrated with a reference 1 kHz sine wave at a level of 114.0 dBSPL. The instrument's C -weighted response
was then electrically tested using a 0.5 volt RMS sinewave at exact frequencies as specified in IEC 651-1979
and ANSI S1.4-1983.
3.0
0.0
-3.0
-6.0
Level -9.0
(dB)
-12.0
-15.0 /Z
-18.0
-21.0
10 31.6 100 316.2 1000 3162 10000 Pnnnn
Frequency (Hz)
Freq (Hz)
---------
Theor
-----
Measured
Error
LD Tolerance
Freq (Hz)
Theor
Measured
Error
LD Tolerance
10.00
-14.3
--------
-14.40
-----
-0.10
------------
+1.7,
-4.0
---------
631.00
-----
0.0
--------
0.20
-----
0.20
------------
+0.5,
-0.5
12.59
-11.2
-11.30
-0.10
+1.7,
-3.0
794.30
0.0
0.20
0.20
+0.5,
-0.5
15.85
-8.5
-8.70
-0.20
+1.7,
-2.0
1000.00
0.0
0.00
0.00
+0.5,
-0.5
19.95
-6.2
-6.50
-0.30
+1.0,
-1.0
1259.00
0.0
-0.10
-0.10
+0.5,
-0.5
25.12
-4.4
-4.60
-0.20
+1.0,
:1.0
1585.00
-0.1
-0.10
0.00
+0.7,
-0.7
31.62
-3.0
-3.20
-0.20
+1.0,
-1..0
1995.00
-0.2
-0.20
0.00
+0.7,
-0.7
39.81
-2.0
-2.10
-0.10
+0.7,
-0.7
2512.00
-0.3
-0.40
-0.10
+0.8,
-0.8
50.12
-1.3
-1.20
0.10
+0.7,
-0.7
3162.00
-0.5
-0.60
-0.10
+0.8,
-0.8
63.10
-0.8
-0.70
0.10
+0.7,
-0.7
3981.00
-0.8
-1.00
-0.20
+1.0,
-1.0•
79.43
-0.5
-0.30
0.20
+0.7,
-0.7
5012.00
-1.3
-1.60
-0.30
+1.2,
-1.2
100.00
-0.3
-0.10
0.20
+0.5,
-0.5
6310.00
-2.0
-2.30
-0.30
+1.5,
-1.5
125.00
-0.2
0.00
0.20
+0.5,
-0.5
7943.00
-3.0
-3..50
-0.50
+1.7,
-1.7
158.50
-0.1
0.20
0.30
+0.5,
-0.5
10000.00
-4.4
-5.00
-0.60
+1.7,
-2.0
199.50
0.0
0.30
0.30
+0.5,
-0.5
12590.00
-6.2
-6.80
-0.60
+1.7,
-3.0
251.20
0.0
0.30
0.30
+0.5,
-0.5
15850.00
-8.5
-9.20
-0.70
+1.7,
-4.0
316.20
0.0
0.30
0.30
+0.5,
-0.5
19950.00
-11.2
-12.10
-0.90
+1.7,
-5..0
398.10
0.0
0.30
0.30
+0.5,
-0.5
25120.00
-14.3
-15.70
0.00
n/a
n/a
501.20
0.0
0.20
0.20
+0.5,
-0.5
31620.00
-17.7
-20.10
0.00
n/a
n/a
This instrument is in compliance with IEC 651-1979 6.1 and 9.2.2, ANSI S1.4-1983 5.1 and 8.2.1, and
IEC 804-1985 5.1 for Type 2 sound level meters when used with a Larson -Davis Type 2 microphone. _
Technician: Keith Driskill Test Date: Mar 17, 2000
Q.A FINAL INSPECTION
Larson -Davis Laboratories (•
1681 West 820 North
Provo, Utah 84601
77
(801)-375-0177, FAX (801)-375-8864
Inspected by
r� r
Q.A FINAL INSPECTION
Larson -Davis Laboratories
1681 West 820 North
Provo, Utah 84601
(801)-375-0177, FAX (801)-375-8864
Inspected by dz�
N
VVAKKAIV I Y REGISTRATION CARD
Larson -Davis (801) 375-0177 FAX (801) 375-0182
In order to provide efficient service and inform you of future updates, please complete,
this card and return it to Larson•Davis within 10 days of purchase.
UserName....................................................................
6. Purchase Date .........................................................
Company......................................................................
Category that Describes Your Industry and
Street Address..............................................................
Application— Check all that Apply
City/State/Zip.............................................
❑ ENVIRONMENTAL NOISE
Telephone Number........
CI Airports ❑ Highways ❑ Industrial
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❑Other..........................................................
Fax Number..................................................................
❑ INDUSTRIAL HYGIENE '
Email ..................... .........................:.............................
❑ Personal Noise Exposure ❑ Area Survey
Instrument Model & Serial #
❑ Other..........................................................
........................................
Cl LABORATORY/R&D
Preamplifier Model & Serial #......................................
❑ Noise Reduction O Vibration Analysis
Microphone Model & Serial #......................................
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1. Was this your first purchase from Larson -Davis?
❑ Other..........................................................
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❑ SPEECH AND HEARING
2. Did you receive all the items that you ordered?
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Organization Type
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in good working condition? Yes ❑ No ❑
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D2140.0007 Rev A
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( S�tl�;iA�.WAW1�t1Sie�i1..,5 .fi't•,:�ii�tifii^�i•� ti 1�H`�� tY'/ : � ,��,' /'� +4'^-••.•'v �^ r_,-"�':,.y, l:,'�^• .r.!. •1.•�f,, rV+;
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Certificate, of • • and Conformance
- -
•-r 2000-24968
Instrument••- 1 Serial Number11 • -• on 02-02-2000.
-The instrument meets factory•- • • • • • Larson - Davis
Procedure D0001.8081', ISO 10012.
New Instrument
•. 02-02-2000
rrCalibration04-02-2001
Calibration, Standards Used
Larson • Davis
2530
1258
12 Months 02/10/2000
1999-18582
Hewlett Packard.
3478A
2911 A68319
12 Months
03/05/1000
0305991
Fluke
21
52270730
12 Months
04/05/2000
040599-1
Hewlett Packard
34401A
3146A10352
12 Months
04/2311000
154974 r
Larson • Davis
2200CM
200106
12 Months
05/0711000
1999-20025
Larson • Davis
9006
2533
12 Months
06/16/2000
1999-20725
Larson • Davis
CAL250
140012
Months
09/2211000
1999 22303
Schaevitz
P3061-15PSI
4987
12 Months I
10/20/2000
154975
Certified Reference Standards are traceable to the National Institute of Standards and Technology (NIST)
' Calibration Environmental Conditions
Temperature: 21 o Centigrade ' Relative Humidity: 23 %
Affirmations
This Certificate attests that this instrument has been calibrated under the stated conditions with Measurement and Test
Equipment (M&TE) Standards traceable to the National Institute of Standards and Technology (NIST). All of the Measurement
Standards have been calibrated to their manufacturers' specified accuracy / uncertainty. Evidence of traceability and accuracy
is on file at Larson • Davis Corporate Headquarters. An acceptable accuracy ratio between the Standard(s) and the item
calibrated has been maintained. This instrument meets or exceeds the manufacturers published specification unless noted.
This calibration complies with ISO 10012. The collective uncertainty of the Measurement Standard used does not exceed 25%
of the applicable tolerance for each characteristic calibrated unless otherwise noted.
Due to state-of-the-art limitations, 4:1 calibration ratios are not possible on pressure measurement standards, microphones
and acoustic calibrators. Calibration ratios for these types of devices are limited to 1:1.,
The results documented in this certificate relate only to the ftem(s) calibrated or tested. Calibration intervalassignment and
adjustment are the responsibility of the end user. This certificate may not be reproduced, except in full,•wfthout the written
approval of Larson • Davis Laboratories.
Technician: Scott Montgomery. - _
Service Center: Larson • Davis Laboratories, Utah Sign — ,
4 LARSON • DAVIS LABORATORIES =
t;
# 1681 West 820 North Provo, Utah 84601 - Phone (801) 3750177_
t v
r
15 Sep. 1999
CAL150*2001
Relative SPL vs..Temp at 36% RH
With a 2530 Mic used to*check levels •
-10 0 10 20 30 40 50
Temperature (deg C)
0:6
04
0.2
a�
0.0
.�
-0.2
r-+
-0.4
a
-0.6
-0.8
-1 0
CAL150*2001
Relative SPL vs..Temp at 36% RH
With a 2530 Mic used to*check levels •
-10 0 10 20 30 40 50
Temperature (deg C)
The LarsoneDavis Model CA150 is a precise microphonecali-
brator intended for the LarsoneDavis .3/8" dianeter
microphones typically used on the Model 700, 710, 712,and
720 SLM/Dosimeters and the Model 705 Noise Badger" . The
CA150 provides a choice of calibration sound pressure Levels,
94.0 and 114.0 dB (switch selectable) at a frequency of 1 <Hz.
The optional adaptor AD110 is available to permit refer--nce
measurements of the CA150 to be made using the Larson •EiDavis
Models 2520 and 2530 1/4" condenser microphones.
Using the Calibrator
1. Select the desired calibration sound pressure level usi-i- the
switch mounted on the side of the calibrator. Wher, the
atmospheric pressure differs from 1013 millibars, acd the
pressure correction listed on the CA150 back label _o the
nominal sound pressure level of 94 or 114 dB to deter -nine
the actual level.
2. Insert the 3/8" microphone fully into the micro _)•-ione
opening at the top of the calibrator. For level verifi:3tion
with 1/4" microphones, insert the ADI 10 adaptor into the
microphone opening and then insert the microphone fully
into the adaptor.
3. With the microphone connected to the instrument being
calibrated, press the CA150's ON button.. With a fresh
battery, the calibrator.will emit an accurate tone for more
than 60 seconds before automatically shutting off.
4. Make a reading. If the reading is not within tolerance, refer
to the instrument's manual for instructions on how to adjust
the instrument.
Note 1: When making a sequence of measurements, a
calibration check and an adjustment (if necessary) of the
instrument should be made at the beginning. At the end of the
measurements, calibration should be checked again. The
inaccuracy of the measurements will be at least the difference
between the beginning and ending calibration values. .
5. Keep a calibration history of all adjustments.
Calibration history keeping can be minimized if adjustments
to the instrument are made only when the tolerance is
exceeded. This is a user decision, but reasonable values
might be ±0.5, ±1.0 or ±1.5 dB for Type 2 measurements.
Calibration History
Larson* Davis strongly recommends that a history report of each
calibration adjustment be kept for each piece of equipment.
Normally, most modern equipment requires little or no adjust-
ment once the initial calibration is performed. But systematic
drifts are possible, and these should be recorded for corrective
action.
The LarsoneDavis Models 712, 720, and 705 automatically
keep a calibration history that can be printed out before an over-
all reset. The Models 700 and 710 provide in the printout offset
values that directly relate to the gain in decibels needed to keep
these instruments in calibration, and these offsets can serve as a
calibration history.
Battery Replacement
At the 114 dB calibration level, the battery will last for approxi-
mately 42 hours, which corresponds to about 1,7.00
calibrations. When using the 94 dB calibration level, the battery
will last for approximately 63 hours, corresponding to about
.2,500 calibrations. As the battery becomes weaker, the calibra-
tion accuracy will not degrade in accuracy, but the operating
time will decrease until the time is too short to accomplish an
adequate calibration. At this time, the battery should be
replaced.
Larson -Davis Laboratories - CA150 Brochure November 30, 1995
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The LarsoneDavis Model CA150 is a precise microphonecali-
brator intended for the LarsoneDavis .3/8" dianeter
microphones typically used on the Model 700, 710, 712,and
720 SLM/Dosimeters and the Model 705 Noise Badger" . The
CA150 provides a choice of calibration sound pressure Levels,
94.0 and 114.0 dB (switch selectable) at a frequency of 1 <Hz.
The optional adaptor AD110 is available to permit refer--nce
measurements of the CA150 to be made using the Larson •EiDavis
Models 2520 and 2530 1/4" condenser microphones.
Using the Calibrator
1. Select the desired calibration sound pressure level usi-i- the
switch mounted on the side of the calibrator. Wher, the
atmospheric pressure differs from 1013 millibars, acd the
pressure correction listed on the CA150 back label _o the
nominal sound pressure level of 94 or 114 dB to deter -nine
the actual level.
2. Insert the 3/8" microphone fully into the micro _)•-ione
opening at the top of the calibrator. For level verifi:3tion
with 1/4" microphones, insert the ADI 10 adaptor into the
microphone opening and then insert the microphone fully
into the adaptor.
3. With the microphone connected to the instrument being
calibrated, press the CA150's ON button.. With a fresh
battery, the calibrator.will emit an accurate tone for more
than 60 seconds before automatically shutting off.
4. Make a reading. If the reading is not within tolerance, refer
to the instrument's manual for instructions on how to adjust
the instrument.
Note 1: When making a sequence of measurements, a
calibration check and an adjustment (if necessary) of the
instrument should be made at the beginning. At the end of the
measurements, calibration should be checked again. The
inaccuracy of the measurements will be at least the difference
between the beginning and ending calibration values. .
5. Keep a calibration history of all adjustments.
Calibration history keeping can be minimized if adjustments
to the instrument are made only when the tolerance is
exceeded. This is a user decision, but reasonable values
might be ±0.5, ±1.0 or ±1.5 dB for Type 2 measurements.
Calibration History
Larson* Davis strongly recommends that a history report of each
calibration adjustment be kept for each piece of equipment.
Normally, most modern equipment requires little or no adjust-
ment once the initial calibration is performed. But systematic
drifts are possible, and these should be recorded for corrective
action.
The LarsoneDavis Models 712, 720, and 705 automatically
keep a calibration history that can be printed out before an over-
all reset. The Models 700 and 710 provide in the printout offset
values that directly relate to the gain in decibels needed to keep
these instruments in calibration, and these offsets can serve as a
calibration history.
Battery Replacement
At the 114 dB calibration level, the battery will last for approxi-
mately 42 hours, which corresponds to about 1,7.00
calibrations. When using the 94 dB calibration level, the battery
will last for approximately 63 hours, corresponding to about
.2,500 calibrations. As the battery becomes weaker, the calibra-
tion accuracy will not degrade in accuracy, but the operating
time will decrease until the time is too short to accomplish an
adequate calibration. At this time, the battery should be
replaced.
Larson -Davis Laboratories - CA150 Brochure November 30, 1995
J
Environmental Precautions
While the CA150 will perform normally under a variety of grad-
ually changing environmental conditions, some precautions
should be taken when sudden changes occur:
1.. The temperature of the CA150 should 'be stable. If the
temperature changes suddenly, such as moving.outdoor to
indoor, provide a stabilization time of"15'minutes. This will
ensure that the temperature compensation sensors are at the
.same temperature as the rest of the unit. Similarly, if the
temperatures of the calibrator and the microphone of the
sound.level meter are different, they should be permitted to
equalize before performing the calibration.
2. While humidity will not affect the CA150, avoid condensing
moisture. Also avoid environments over 90% relative
humidity which may adversely affect the microphone' If this
is not possible, calibration should be rechecked in better
conditions.
The CA150 is insensitive to magnetic fields; however, the
instrument being tested may not be. Therefore, calibration
should not be done near motors, dynamos, high voltage
wires, transformers, or other sources of electromagnetic
fields.
Calibrator Certification .
The American National Standards Institute (ANSI) says, "An
acoustical calibrator should be recalibrated at least annually by
the instrument manufacturer or an acoustical test laboratory
qualified to perform calibration.". Specification for Acoustical
Calibrators. (ANSI 51.40, 1984, par. 5.2.)
Larson•Davis believes the frequency of recalibration depends
on the number of calibrators being used and the number of
instruments .being calibrated. With this in mind, the following
guidelines are presented for your consideration:
1. For one calibrator and one instrument, the CA150 should be
.certified at least yearly, and even more often would not be
unreasonable for critical applications. 1
If a systematic drift of several dB occurs, there is no reliable
way to verify which instrument is at fault, although it is more
likely to be the instrument. We recommend that the CA150
be checked against another calibrator at this time.
For one calibrator and several measurement instruments,
one certification a year is recommended. But if no
systematic drift occurs, every two years might be
satisfactory.
If the CA150 is being used to calibrate several instruments,
then the history of calibration adjustments can usually
pinpoint which instrument is drifting. If all the measurements
are drifting the same direction by an amount you consider
significant, then the CA150 should be recertified.
3. For several calibrators and several instruments, one
certification per year is recommended.
If several instruments and several calibrators are in use, then
the history..°of .calibration adjustments would precisE;iy
pinpoint any problem pieces of equipment. Furthermore, it is
probably satisfactory -to recalibrate only one of the calibrators
each.year..
Specifications
Calibration Sound
94.0 and 114.0 d6 re: 20.µPa
Pressure Level
(±0.5 dB) ® 1013 millibars and
20° C
Frequency
1 kHz ±1 %
Harmonic Distortion
<3%
Stabilizing Time
± 0.2 dB after 2 seconds
Barometric Pressure
650 to 1080 mbar
Range
Corrected SPL will be within
±0.5 dB.
Barometric pressure may have
±10% uncertainty.
Temperature Range
SPL variation ±0.4 dB (typically
0.005 dB/* C)
Frequency variation ±2% over the
range -10 to 50° C
Humidity Range
SPL variation ±0.3 dB
Frequency variation ±2% over the
range 10 to 95% relative humidity
Storage Temperature
-40 to 60.0° C
Storage Humidity
0 to 99% relative humidity (non -
condensing)
Effective Volume of
2.64 cm (0.16in')
Calibrator & Micro-
phone
Battery
9 V NEDA 1604A or IEC 6LR61
With sufficient battery voltage, cal-
ibrator will run (after releasing ON
button) for 1 to 1.5 minutes before
automatic shutdown. With insuffi-
cient battery voltage, calibrator will
not remain ON after release of but-
ton.
Traceability
Utilize the Larson•Davis AD110
1/4" microphone adaptor and a
Larson•Davis Model 2520 or 2530
precision condenser microphone
in conjunction with other traceable
measuring instruments to establish
traceability of the output level and
frequency of the Model CA150.
Standards met
ANSI 51.40-1984 - Specifications
for Acoustic Calibrators
IEC 942-1988 Class 2 - Sound Cali-
brators
.Larson -Davis Laboratories,- CA150 Brochure November 30, 1995
GII
MOOEL CAL150 ACOUSTIC CBRATOR EMC INFORMATION C E
Electromagnetic Compatibility Information
Mode! CAU 50 Precision Acoustic Calibrator
Pursuanttmthe.standards.• • compliance: -
Pursuant
• •Pursuant to the standards route to compliance of. the Electromagnetic Compatibility
Regulations 1992, as amended by the Electromagnetic Compatibility (Amendment)
Regulations 1994, Larson Davis, Inc certify that the following relevant apparatus:
Model CAL 150 Acoustic Calibrator
has been tested in representative configuration with:
PRM910 preamplifier, ECX010 extension cable, 2520 microphone and Model 870 Type
1 Precision Sound Level Meter (test instrument. not subject to RF field)
in relation with the following applicable EMC standards:
BS EN 50081-1:1992 Electromagnetic compatibility - Generic emission standard, Part 1.
Residential, Commercial and. light industry
BS EN 50082-1:1992 Electromagnetic oompatibility - Generic immunity standard, Part 1.
Residential, Commercial and light industry
and when used in accordance with the intended purpose as contained in its instruction
manual, including: a) appropriate level corrections are performed for ambient pressure,
b) for battery operation only and c) no exposure to electromagnetic fields exceeding
those specified in listed immunity standard(s) as may for example occur within 1m of
hand held radio transmitting equipment, or near other RF generating equipment such as
RF sealers, welders, etc.
has been found to conform with the general protection requirements of Council Directive
89r336/EEC on the approximation of the -laws of the Member States relating to
electromagnetic compatibility. Issued in the United Kingdom.
Spec ificationfor ••r.• of •
The Model CAL150 Acoustic Calibrator equivalent SPL deviation limit during immunity .
tests was within t0.2 dB of nominal level as specified in the proposed ANSI S1.14 -199X
specification. for RADIO FREQUENCY ELECROMAGNIETIC SUSCEPTIBILfTY OF
ACOUSTICAL INSTRUMENTS.
-• tic •D •• -n-•