B&K Precision 4045B - Manual - Manual (Page 25)

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delivered from the function generator.
Output Connector
Use this connector to transfer the main output signal from
the function generator.
Trig In Connector
Use this connector to apply an external trigger or gate
signal, depending on the waveform generator setting, to
the generator. When the built-in frequency counter is
enabled, this connector becomes an input for the counter.
Sync Out Connector
Use this connector to output a positive TTL sync pulse
generated at each waveform cycle.
Modulation In Connector
5V p-p signal for 100% modulation, 10Kohms input
impedance with DC - >20 KHz bandwidth.
3.5 Output Connections
The waveform generator output circuits operate as a
50 Ω voltage source working into a 50 Ω load. At
higher frequencies, non-terminated or improperly
terminated output causes aberrations on the output
waveform. In addition, loads less than 50 Ω reduce
the waveform amplitude, while loads more than 50 Ω
increase waveform amplitude.