B-10 Sections 5, 6, 7 and 9 (except 9.3) Model 831 Manual
h) Electrical Insert Signals
The electrical design of the input device to insert electrical signals into the preamplifier is a series
12pF ± 5% capacitor. The Larson Davis ADP090 is used for this purpose. The ADP090 can be used
for noise floor measurements by attaching the included short on the front of the ADP090.
i) Self-generated Noise
Self-generated noise of the Model 831 is shown in Table B-10.
Table B-1: Self-generated Noise Levels
j) Highest Sound Pressure Level
The highest sound pressure level the Larson Davis 831 is designed to accommodate at the level of
overload is 140 dB. The peak-to-peak voltage at this level is 28 Vpp input through the ADP090.
k) Battery Power Voltage Range
The battery power supply voltage range for which the 831 conform to this standard:
6.4 Volts maximum
The 831 will shut down if the battery is below 4.0 Volts when used with alkaline batteries. Therefore
from 4.0 to 6.4 Volts is the usable range of battery voltage. The instrument will shut off to ensure that
no data is taken that would not meet the requirements of IEC 61672.
l) Typical Stabilization Time
The typical time interval needed to stabilize after changes in environmental conditions.
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