Performance Tests
TDS 420A, TDS 430A & TDS 460A Service Manual
4-33
Display the live/reference
waveforms for all four channels
Note their overlapping ground
references.
Read the
results here.
Identify the time reference
points of the waveforms.
Turn on the cursor and align
the V bar cursors to the time
reference points.
1
2
3
4
Figure 4- 9: Measurement of Channel Delay
h. Check CH 1 to CH 2 and CH 3 to CH 4 against limit:
H Press WAVEFORM OFF four times to remove all waveforms.
H Press CH 1.
H Press MORE; then press the main-menu button Ref 2.
H Measure the delay between CH 1 and Ref 2 using the method
described in substep f above.
H CHECK that the cursor readout on screen is ≤200 ps.
H If you are testing a TDS 430A, skip to step 3.
H Press WAVEFORM OFF twice to turn off CH 1 and Ref 2; then
press CH 4 to turn on CH 4.
H Press MORE; then press the main-menu button Ref 3 to display the
CH3waveformstoredinRef3.
H Measure the delay between Ref 3 and CH 4 using the method
described in substep f above.
H CHECK that the cursor readout on screen is ≤200 ps.
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