Keysight N774-C & 8162-C Series User’s Guide 45
Getting Started 2
Electrical Connectors
Rear Panel Trigger BNC Connectors
There are two BNC connectors on the rear panel of your N774-C
instrument. These are the Trigger Out and the Trigger In connectors.
Front Panel Analog Output BNC Connector
The BNC head connectors are available on the front panel of your N774-C
instruments (except N7744C and N7745). It provides the possibility to
create an linear or logarithmic analog output.
The analog voltage is always in the range between 0 and 2 V. For linear
output, 1 V corresponds to the nominal value of the current range (like
100 µW in the -10 dBm range) and 0 V corresponds to zero signal.
For logarithmic output, the voltage represents the optical power
independent of the current range. For power meters with a maximum
range of +10 dBm, 2 V corresponds to +20 dBm, 1.8 V to +10 dBm, 1.6 V to
0 dBm, 1.4 V to -10 dBm,... 0 V to -80 dBm. For power meters with a
maximum range of +20 or +30 dBm, the scale is shifted by 10 dB, so 2 V
represents +30 dBm and 0 V is – 70 dBm. For the 81628C with a +40 dBm
maximum range, 2 V is +40 dBm and 0 V is -60 dBm.
The Trigger In is a TTL input. A maximum of 5 V can be applied as an
external voltage to this input connector.
The Trigger Output is a TTL output. Do not apply an external voltage to
this connector.
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