B&K Precision 4052-4055 - Manual - Manual (Page 48)

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6. Select Source and choose between Internal, External, or Manual.
Internal – Internal trigger source. Burst will be controlled by the specified
burst period.
External – External trigger source. Users can connect an external signal into
the rear BNC terminal labeled ExtTrig/Gate/FSK/Burst to trigger the burst.
This is for both Ncycle and Gated burst operations.
Manual – Manual trigger source.
7. If Gated option is selected, a Polarity option will be available. Toggle the
corresponding menu function key to select between Positive or Negative.
Positive – The positive polarity (High level) will cause the gated burst output.
Negative – The negative polarity (Low level) will cause the gated burst
output.
8. Press the 1/2 option to go to the second page of the menu.
If Internal source is selected previously, the Trig On option will be available.
On – A square waveform with 50% duty cycle will output from the ExtTrig
BNC connector at the beginning of the burst. The frequency corresponds to