Tektronix DPO3000 Series, Service Manual

Page: 36 / 79

Adjustment Procedures
Troubleshooting Refer to the following table for common issues encountered during the calibration
procedure.
Problem Things to try
The instrument fails a test
Are the channels hooked up properly, routed to the right channels, and turned on
Is the signal set to the correct waveform, frequency, and termination (if applicable to the test)
Is the output set to
ON (the red light will be illuminated)
If you make a correction or fi nd that everything appears to be correct, click the Go back a
step button to try the test again.
I can’t set the amplitude to 0 V, as
speci
fi ed in the prompt
Ground the signal by pushing the lower-bezel button.
I can’t fi nd the parameters that I
need to set
Is the waveform set correctly
Is the grounding button on? When this is active, you will not be able to make a channel
selection, so in some cases you might need to temporarily deselect the grounding option
while you make a channel selection.
If you can
fi nd the termination settings, click the CHANNEL SELECT lower-bezel button.
I can’t set the voltage to 625 Hz Set the time marker to 1.6 Ms. This will automatically set the voltage to 625 Hz.
I can’t set the signal to all channels If you are unable to set the signal to all channels, try setting the signal to Channel 1.
I’m having trouble with tests that
require 6 V or -6 V Follow the steps for 6 V and -6 V that appear in Step 6 of the DC Voltage test. (See page 3-6,
DC Voltage .)
Ensure that the polarity is correct, by referring to the icon that appears in the upper-left corner
of the calibrator screen.
If the instrument fails a test, go all the way back to the
fi rst 6 V test (6 V on Channel 1) and
start the sequence over again.
The Sine Signal test failed If the prompt speci fi ed Channel 4, try setting the signal to Channel 5, instead.
3–10 MSO3000 and DPO3000 Series Digital Phosphor Oscilloscopes Service Manual