Larson Davis SoundAdvisor 831C Reference Manual page 196

Table B.7 SLM Noise Levels (Continued) (Sheet 2 of 2)
Self Generated Electrical
Self Generated Total Noise
Note: Combination of the electronic noise and the thermal noise of the 377B02
j) Highest Sound Pressure Level
The highest sound pressure level the Larson Davis 831C is designed to accommodate at the level of overload is 140
dB. The maximum peak-to-peak voltage is 28 Vpp input through the ADP090.
k) Battery Power Voltage Range
The battery power supply voltage range for which the 831C conforms to this standard:
16.8 Volts maximum
The 831C will shut down if the battery is below 4.0 Volts when used with alkaline batteries. Therefore
from 4.0 to 16.8 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:
For a temperature change of 5 °C then 30 minutes are required.
For a static pressure change of 5 kPa then 15 seconds are required.
For a humidity change of 25% (non-condensing) then 30 minutes are required.
m) Field Strength > 10 V/m
The 831C was not measured for field strengths greater than 10 V/m.
n) Radio Frequency Emission
The mode of operation of the 831C that produces the greatest radio frequency emission levels is with the 831C set
to run with the LCD backlight on, an external charger (PSAA20R-120 charger), Ethernet dongle, and USB cable
attached and with an EXC020 (20' microphone extension cable) between the PRM831 and meter.
o) AC Power and Radio Frequency Susceptibility
The mode of operation of the 831C that produced the least immunity to the effects of exposure to AC power-
frequency and radio frequency field is with the 831C set to run with the LCD backlight on, an external charger
(PSAA20R-120 charger), Ethernet dongle, and USB cable attached and with an EXC020 (20' microphone extension
cable) between the PRM831 and meter.
SoundAdvisor Model 831C
Noise
C
Z
Weighting Typical (dB)
A
C
Z
microphone at 68 °F (20 °C) measured in a sealed and vibration isolated cav-
ity with an averaging time of 60 seconds. Electronic noise of the instrument
with an ADP090 (12 pF) in place of the microphone highest anticipated self-
generated noise.
0 dB Gain
13 16
22 25
0 dB Gain
Max (dB) Typical (dB)
16 19
17 20
23 26
20 dB Gain
12 15
22 25
20 dB Gain
Max (dB)
16 17
16 19
23 26
B-10