Keysight Infiniium 8000 Series, Service Manual

Page: 52 / 162

Chapter 3: Testing Performance
To verify threshold accuracy
52
f Select Measure from the menu bar and then select Markers...
g Set the mode to Track Waveforms.
h Set the position of both markers to center screen by selecting the 0 buttons for
each marker.
i Close the Marker Setup window.
j Display the states of the digital bits at the markers in both hexadecimal and
binary forms by selecting the Logic tab in the marker display area at the bottom
of the LCD display.
Note: The data in the left column shows the states of the digital inputs at the
Cursor A position and the data in the right column shows the states of the digital
inputs at the Cursor B position.
k Set the oscilloscope digital threshold to the value being tested (e.g. +5V, 0V or -
5V) as follows:
From the menu bar, select Setup, then select Digital..., then select the Threshold
tab. Make the following settings for both pods:
Set the Logic Family to User Defined.
Set the Threshold for both pods to the value being tested. Start with the first
Select here
Select here
Select the
logic tab