Model 831 Manual Frequency Response A-57
Model PRM831
The Larson Davis PRM831 is an electret microphone preamplifier for use with a Larson Davis Model
831 Sound Level Meter. It requires very little supply current and will drive 300 feet of cable. The
preamplifier operates over wide temperature and humidity ranges. It has very little attenuation for use
with 50 mV/Pa sensitivity microphones up to 140 dBSPL.
Specifications
Frequency response
with respect to the response at 1 kHz with 1 Volts rms input and 12 pF equivalent microphone.
8 Hz to 16 Hz +0.1, -0.2 dB
16 Hz to 100 kHz +0.1, -0.1 dB
Lower -3 dB limit < 1.5 Hz
Attenuation
0.1 dB (typical)
Input Impedance
10 G Ohm // 0.16 pF
Output Impedance
50 Ohm
Maximum Output
28 Vpp
143 dB peak for microphones with 50 mV/Pa sensitivity
Maximum Output Current
12 mA peak
Distortion
Harmonics <-70 dBC with 8 Volt rms output at 1 kHz
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