Threshold is at limit
The threshold setting is used by the HP 54645D oscilloscope digital channel
input comparators to decide whether a signal is a logic high or logic low. The
threshold must be set to a value between –6.00 V and +6.00 V inclusive.
Time/Div is at limit
The time per division must be set to a value between 50 s/div and 2 ns/div
inclusive.
Use ’Recover Screen’ in Setup menu to restore the display
If you inadvertently change the Volts/Div on a given analog channel, that
analog channel will disappear from the display. If you change the
Volts/Div back to the original setting, the last scope display of that
channel re-appears on the screen. You can also choose to recover the
screen by pressing
Setup
, then the
Recover Screen
softkey.
Messages
10-8
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