Model 831 Manual 831 Components 3-3
• I/O Connector for Peripherals and External Power:
typically used with external devices. For more
information, see “I/O Connector Specification” on
page A-9:
•CBL143 and CBL151 cables: these cables permit the
Model 831 to be powered from external 12 V batteries
•CBL154 cable: used to obtain power from a battery
when used with the 426A12
•831-INT: integrates the Model 831 with outdoor
microphone units (426A12 and PRM2100K) and
weather transducers
•426A12 and PRM2101K: Model 831 provides control
signals to these outdoor microphone units when not
used with 831-INT
Microphones and Microphone Preamplifiers
The Model 831 is designed for use with prepolarized
microphones. The following microphone preamplifier is
used:
For information on using the Model
831 with the PRM2103 preamplifier,
see the PRM2103 Manual.
• PRM831 1/2” Microphone Preamplifier
The most commonly used microphones, which can be used
with either of these preamplifiers are as follows:
• 1/2” Free Field Microphone with nominal sensitivity of
50 mV/Pa
• 1/2” Random Incidence Microphone with nominal
sensitivity of 50 mV/Pa
• 1/4” Free Field Microphone with nominal sensitivity of
3.16 mV/Pa (ADP043 adaptor required)
• 1/4” Pressure Microphone with nominal sensitivity of 1
mV/Pa (ADP043 adaptor required).
There are two equivalent electrical impedance adaptors
available. These are discussed in Chapter 1 "Optional
Accessories" on page 1-5.
Display
The Model 831 has a 160 x 240 graphic, liquid crystal
greyscale display. The display is backlit to provide
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