Model 831 Manual Model 831 Specifications A-15
AC/DC Output
The purpose of the AC output is to drive a headset to listen to live and recorded sounds. It may be used
for other purposes, but may not function as expected as a source for additional analysis equipment.
The output is amplified for listening purposes and therefore is limited in its maximum output to be less
than the instrument’s maximum input level. For connection to external analysis equipment use the
adapter ADP015 and cable EXC006 to extract the signal directly from the preamplifier output. When
using the PRM831 preamplifier, there will be a DC bias on the output of the BNC connector of the
ADP015 of approximately + 17 Volts.
AC/DC Output Connector 2.5 mm Sub-Miniature Phone Jack
Tip: DC Output
Ring: AC Output
Sleeve: Ground
AC Output Voltage Range Vpeak maximum output
0.5 mV to 1.6 Vrms sine wave
~70 dB dynamic range
AC Output Gain
(relative to instrument input)
+ 19.2 dB
AC Output Frequency Weighting Signal is unweighted with frequency limitations imposed by
hardware design (see below)
AC Output Frequency Response 20 Hz to 23.6 kHz (-3 dB), R
L
= 10 k
21 Hz to 23.6 kHz (-3 dB), R
L
= 600
95 Hz to 23.6 kHz (-3 dB), R
L
= 16
AC Output Recommended Loads Headset with 16 or greaterspeaker impedance
Resistive loads greater than 600 for maximum frequency
response range.
AC Output Impedance Low impedance headset speaker driver with 100 F coupling
capacitor. Z = 1.5 + 1592/f, where Z is output impedance in
(Ohms) and f is frequency in Hz.
Instrument readings are not affected by AC output loading
although a short circuit when there is a large signal output
may draw excessive power such that the instrument could
power off.
AC Output Phase and Delay - 180relative to input, 128 s digital delay
DC Output Frequency Weighting Follows the SLM Frequency Weighting: A, C or Z
Table A-12 AC/DC Output
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