Tektronix DPO3000 Series, Service Manual

Page: 33 / 79

Adjustment Procedures
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.
For any nonzero voltage : Before you select the voltage, you must fi rst
ensure that the calibrator is in direct mode. Push the lower-bezel
button until 1.0 is selected.
For 6 V or -6 V :
a. Push the AUX front panel button.
b. Push the side-bezel button for a 6 V signal or push the
side-bezel button for a -6 V signal. The polarity will be indicated only
by the icon that appears in the upper-left corner of the calibrator screen.
c. Set the amplitude to either 6 V or -6 V.
d. Set the Pulse/Energy setting to 7.2 Joules (the time should show 10s).
e. When all of the parameters are set and you ensure that the output is
ON, push the
Trig Pulse side-bezel and IMMEDIATELY push the
OK Do Next Step side-bezel button on the oscilloscope.
CAUTION. Once you push the Trig Pulse button on the calibrator,
you have only 9 seconds to push the OK Do Next Step button on the
oscilloscope. If the instrument fails one of these tests, go all the way back
to the
fi rst 6 V test (6 V on channel 1) and start that sequence over again.
7. Ensure that the red light is illuminated to indicate that the output is on. If not,
push the
ON button, as shown below:
8. On the oscilloscope, push the OK Do Next Step side-bezel button.
MSO3000 and DPO3000 Series Digital Phosphor Oscilloscopes Service Manual 3–7