Tektronix 4000 Series, Service Manual

Page: 32 / 78

Adjustment Procedures
3- 8
Tektronix 4000 Series Digital Phosphor Oscilloscopes Service Manual
Completing the Procedure
Instructions for completing the DC Voltage, Time Mark, Deskew and Sine Signal
tests are below. For each step in the calibration procedure, start at the beginning
of the numbered instructions for the specific test type, and carefully complete
each step.
If the oscilloscope fails a step, consult the
Troubleshooting
section at the end of
this chapter, revert to the previous step and try again. If the step fails again,
return to the first step in the calibration procedure and try the entire procedure
again. If the procedure fails, there could be problem with the oscilloscope.
Consider seeking customer support.
The DC Voltage test is the first test to appear on the prompts, and it usually
makes up the majority of the calibration procedure tests. For each DC Voltage
test, complete all 8 steps listed below to best ensure that the test will pass.
1. Push the DC/Square button.
2. Push the WAVEFORM lower--bezel button, and then push the DC Positive
right--bezel button.
3. Push the CHANNEL SELECT lower--bezel button.
4. Push the LOAD lower--bezel button to highlight either 1M
Ω
or 50 M
Ω
.
5.
Select the specified channels, by using the side--bezel buttons, and then click
the
EXIT lower --bezel button.
6. If the amplitude field is not selected, use the front panel scroll buttons. Type
the specified voltage, and then push the appropriate unit in the right--bezel
menu.
H
For 0 V : ground the signal by pushing the grounding lower--
bezel button. 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 the prompt
requires all channels and the signal is grounded, The calibrator screen
will default to Channel 1.
H
For any non--zero voltage : Before you select the voltage, you must first
ensure that the calibrator is in direct mode. Push the
1 2
5
1.Ø
lower--bezel
button until 1.0 is selected.
H
For 6 V or --6 V :
a.
Push the AUX front panel button.
DC Voltage