HP 54522A - Page 259

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Trigger
Specifications and Characteristics
Operating Characteristics
Pan and Zoom Changing the Time/div and/or Delay values once
acquisition is stopped allows access to all captured data on each
acquisition in the real-time sampling mode only.
The record length control sets the number of points (512 to 32,768) acquired
with each acquisition. The auto adjust softkey allows setting the sample rate
independent of the time base. The entire record length may be displayed
when the oscilloscope is in the run mode.
Delay Between Channels You can null out differences in delay
between channels to compensate for differences in input cables or probe
length using the probe null feature.
Reference Location You can set the reference point at the left edge,
center, or right edge of the display. The reference point is the trigger
point plus the delay time.
Auto Trigger Auto trigger provides an acquisition when no trigger is
present. When set to auto, if the instrument does not see a trigger within
about 20 ms, it will automatically start an acquisition. When set to trg’d,
it will wait for the next qualified trigger.
Trigger Holdoff Trigger can be held off either by time or events over
the ranges:
e time: 40 ns - 320 ms
e@ events: 2 - 16,000,000
An event is defined as the specified trigger condition. A separate holdoff
setting (time or events) is available for each trigger mode except delayed
trigger, which is set to 40 ns. Holdoff is not available for the auxiliary or line
trigger. The maximum event counting rate is 70 MHz.
Noise Reject Trigger Reject provides improved triggering on noisy
signals by increasing trigger hysteresis (internal trigger only). When set
on, noise reject is active for all trigger modes.
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