E4990A Help
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Negative Edge
Detect external trigger with negative edge.
Positive Edge
Detect external trigger with positive edge.
The setting for trigger polarity is NOT valid for the
external trigger from the 24 Bit I/O (Hander).
Setting with Trigger Delay
Set the external trigger delay time at each point. The trigger delay works
when the trigger source is set to external.
1. Press Trigger > Trig Delay.
2. Enter an external trigger delay time.
See the timing chart for sweep.
Trigger Delay Time and Point Trigger Interval
External trigger pulses which are supplied until the next measurement
becomes ready after the start of a one-point measurement, are ignored,
and the next trigger is generated by a pulse supplied after the completion
of the one-point measurement.
The time until the next trigger can be accepted after the start of a one-
point measurement depends on the IFBW and other settings of the
analyzer. For example, in the case of a frequency's zero-span
measurement, the time until the next measurement is ready after the start
of a one-point measurement is obtained by dividing the time required for a
single sweep in On Sweep mode, instead of On Point mode, by the number
of measurement points. If you use the point trigger function with external
trigger pulses that are wider than this time, point trigger measurement is
performed at each pulse input.
The figure below shows the timing chart of an external trigger when the
point trigger function is on.
Timing chart of external trigger (trigger source = external)
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