Larson Davis SoundAdvisor 831C Reference Manual page 155

Table A.6 Certificate of Conformance; PRM831
Frequency response of this model PRM831 preamplifier was tested at a level of 1 Vrms with 12pF microphone
capacitance and driving a short cable. Output level at 1kHz is 0.9878 Vrms (-0.107 dBV), uncertainty 0.033 dB.
Results are displayed relative to the level at 1kHz.
Level
(dB)
Freq (Hz) Measured (dB) Uncert (dB)
--------- ------------- -----------
Noise floor data: 1kHz (1/3 Octave) = 0.42 uV, -7.6 dBuV, uncertainty = 0.47 dB
Uncertainties are given as expanded uncertainty at ~95% confidence interval (k = 2).
Technician: Leroy Harbaugh
SoundAdvisor Model 831C
Preamplifier Model: PRM831 Serial Number: 10123
0.5
0.0
-0.5
-1.0
-1.5
-2.0
2.5 5 10 20
2.51 -1.05 0.075
3.16 -0.70 0.058
3.98 -0.46 0.058
5.01 -0.30 0.036
6.31 -0.20 0.036
7.94 -0.13 0.036
10.00 -0.09 0.016
12.59 -0.06 0.016
15.85 -0.04 0.016
19.95 -0.03 0.016
25.12 -0.03 0.016
31.62 -0.02 0.016
39.81 -0.02 0.016
50.12 -0.02 0.016
63.10 -0.01 0.016
79.43 -0.01 0.016
100.00 -0.01 0.016
125.89 -0.01 0.016
158.49 -0.01 0.016
199.53 -0.01 0.016
251.19 -0.01 0.016
316.23 -0.01 0.016
398.11 -0.00 0.016
501.19 -0.00 0.016
Flat (20Hz-20kHz) = 4.3 uV, 12.6 dBuV, uncertainty = 0.47 dB
Awt = 1.8 uV, 4.9 dBuV, uncertainty = 0.46 dB
Test Date: 10OCT2007
Certificate of Electrical Conformance
50 100 200 501 1000
Frequency (Hz)
Tolerance (dB) Freq (Hz) Measured (dB) Uncert (dB)
-------------- --------- ------------- -----------
-0.82, -1.26 630.96
-0.54, -0.86 794.33
-0.34, -0.58 1000.00
-0.21, -0.39 1258.90
-0.12, -0.26 1584.90
-0.07, -0.19 1995.30
-0.03, -0.15 2511.90
-0.01, -0.11 3162.30
+0.01, -0.09 3981.10
+0.02, -0.08 5011.90
+0.02, -0.08 6309.60
+0.03, -0.07 7943.30
+0.03, -0.07 10000.00
+0.04, -0.06 12589.00
+0.04, -0.06 15849.00
+0.04, -0.06 19953.00
+0.04, -0.06 25250.00
+0.04, -0.06 31500.00
+0.05, -0.05 39750.00
+0.05, -0.05 50000.00
+0.05, -0.05 63000.00
+0.05, -0.05 79500.00
+0.05, -0.05 100000.00
+0.05, -0.05 126000.00
1995 5012 10000 19953 50000 100000
Tolerance (dB)
--------------
-0.00 0.016
-0.00 0.016
0.00 0.016
0.00 0.016
0.00 0.016
0.00 0.016
0.00 0.016
0.00 0.016
0.01 0.016
0.00 0.016
0.00 0.016
0.00 0.016
0.01 0.016
0.01 0.016
0.01 0.016
0.01 0.016
0.01 0.022
0.01 0.022
0.01 0.022
0.01 0.022
0.00 0.047
0.00 0.047
0.00 0.047
0.00 0.063
+0.05, -0.05
+0.05, -0.05
+0.05, -0.05
+0.05, -0.05
+0.05, -0.05
+0.05, -0.05
+0.05, -0.05
+0.05, -0.05
+0.05, -0.05
+0.05, -0.05
+0.05, -0.05
+0.05, -0.05
+0.05, -0.05
+0.05, -0.05
+0.05, -0.05
+0.05, -0.05
+0.05, -0.05
+0.05, -0.05
+0.05, -0.05
+0.06, -0.06
+0.07, -0.07
+0.08, -0.08
+0.09, -0.09
+0.10, -0.10
A-9