Configuring The Mixed-Signal Oscilloscope; To Change The Logic Threshold For Input Signals - HP 54645A User's And Service Manual

Configuring the Mixed-Signal Oscilloscope

This section describes how to configure the following items for the
HP 54645D Mixed-Signal Oscilloscope, including changing the logic
threshold for input signals.

To change the logic threshold for input signals

Press
1
Label/Threshold
Press the Threshold Menu
2
which you want to set the logic threshold, and the available logic
thresholds.
Press the Set softkey to select a group of digital channels.
3
You can set thresholds for digital channels D0-D7 and D8-D15.
Press the TTL , CMOS , or
4
To set a different threshold, press the softkey just to the right of the
5
ECL softkey (see the following figure). Then, vary the threshold voltage from
-6.00 V to 6.00 V with the Entry knob.
If you want to set the threshold for the other group of channels,
6
select the other group and do steps 4 and 5 again.
You can exit the threshold setting menu by pressing Previous Menu or
another front-panel key.
.
softkey to display the range of channels for
ECL softkey to choose a preset threshold.
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