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Sound Level Meters – User Manual
8.5
Electrical outputs
8.5.1 AC output
The AC output is provided on the 3.5 mm jack socket at the bottom of the instrument.
Do not use a stereo jack plug in this socket. Only use a 3.5 mm mono jack plug.
The AC output has four settings: a combination of high or low levels and a 0 dB or +20 dB
gain.
Voltages and full-scale levels are as follows:
High levels (70-140 dB)
0 dB gain
1.3 Vpk-pk (450 mVrms) at full scale 140 dB
+20 dB gain 1.7 Vpk-pk (600 mVrms) at full scale 132 dB
Low levels (20-90 dB)
0 dB gain
400 mVpk-pk (140 mVrms) at full scale 90 dB
+20 dB gain 1.3 Vpk-pk (450 mVrms) at full scale 90 dB
The output is unweighted, i.e. Z-weighted.
AC output cables
The AC output should be used with a ZL:174, ZL:177 or ZL:185 cable.
These cables are available from Cirrus Research plc or your local distributor. Do not use any
other cable with the instrument. This may damage the instrument and invalidate your warranty.
8.5.2 DC output
The DC output is provided on the 18-pin Multi-IO socket at the bottom of the instrument. The
output is set to 25 mV/db with LAF updated 16 times per second.
DC output cables
The DC output is available using a ZL:174 output cable.
This cable is available from Cirrus Research plc or your local distributor. Do not use any other
cable with the GPS. This may damage the instrument and invalidate your warranty.
Summary of Contents for Optimus+
Page 1: ...Instrument Handbook Optimus GPS Sound Level Meters...
Page 22: ...Page 22 Optimus Sound Level Meters User Manual A pin identifies the measurement location...
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