To Adjust The Time Base (Sweep Speed) - HP 54620A User's And Service Manual

Getting Started

To adjust the time base (sweep speed)

To adjust the time base (sweep speed)
•
To increase the sweep speed (decrease the amount of time per
division on the display), turn the Time/Div knob clockwise.
•
To decrease the sweep speed (increase the amount of time per
division on the display), turn the Time/Div knob counterclockwise.
The sweep speed is adjustable from 5 ns/div to 1 s/div in 1, 2, 5 increments.
Turning on in the Main/Delayed menu gives finer increments.
Vernier
When using the HP 54620A/C, and Auto Glitch Detect is disabled, you can
adjust the sweep speed to 2 s/div and 5 s/div. "GL" is not displayed if the logic
analyzer Auto Glitch Detect is disabled.
The current sweep speed setting affects other instrument operating
parameters. For example:
•
The sampling period is a function of the Time/div setting, but changes only
when a new acquisition begins.
•
To avoid missing fast events or short pulses, the analyzer automatically
switches to glitch mode at all time base settings slower than 1 µs/div. The
glitch mode indicator "GL" will appear in the status line.
•
In advanced triggering, the minimum limit for a pattern duration trigger is
two sample periods. Because the sampling rate depends on the Time/Div
setting and Auto Glitch Detect setting, the minimum duration and
resolution of the duration will change as the Time/Div setting changes, or
as the Auto Glitch Detect setting changes.
See chapter 4, "Ensuring Accurate Measurements," for more information.
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