Use of the Output Socket
The GA112 is equipped with a three-pin lemo connector on the right
hand side of the instrument. The connector provides an AC and a
DC signal output (see figure 4).
The AC output is a logarithmic output and is direct representation of
the sound present at the microphone. This output is actually suitable
for recording the noise by means of a tape recorder for analysis at a
later date. A full-scale deflection on the meter corresponds to a
120mV rms signal into a 10kohm loading.
The DC output is a linear signal suitable for chart recorders. A volt-
age of 1.5V is given for a full-scale deflection on the meter, zero on
the meter corresponds to approximately zero volts. The DC output is
designed to drive a load of 10kohm.
A suitable connector for the lemo socket is the, LEMO type
FGGOB303LAD52Z.
Figure 4 – LEMO socket connections
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Summary of Contents for GA112
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