Adjustment Procedure
Deskew
Complete these
steps t o set the calibrator output for deskew.
NOTE. If you are adjusting an MSO4000B Series, and the oscilloscope prompts
you to connect the digital channels, connect the digital probe according to
the instructions in Connecting the Equipment. (See page 9, Connecting the
Equipment.)
1. Set the calibrator output signal type as follows:
a. Push the Aux front-panel button.
b. Push the Zero skew
side-bezel button.
NOTE. Selecting the deskew signal automatically turns all channels on.
2. Set the calibrator termination and output channels as follows:
a. Push the CHANNEL SELECT lower-bezel button.
b. Select
the channel(s) specified by the oscilloscope p rompt.
c. Push the LOAD lower-bezel button to highlight either 1MΩ or 50 Ω,as
speci
fied by the oscilloscope prompt.
d. Push the EXIT lower bezel button.
3. Set the calibrator amplitude as follows:
a. Select the Amplitude field using the front-panel tab key
.
b. Set the voltage specified by the oscilloscope prompt.
4. Set the calibrator frequency as follows:
a. Se
lect the Frequency field using the front-panel tab key
.
b. Set the frequency specified by the oscilloscope prompt.
5. Push the ON button and verify that the red light turns on to indicate that
the calibrator output is on.
6. On the oscilloscope, push the OK Do Next Step right-bezel button. In some
cases, the deskew can take several minutes.
CAUTION. Keep the d igital probe plugged in to the oscilloscope. Unplugging the
probe can abort the adjustment.
16 MSO4000B and DPO4000B Series Digital Phosphor Oscilloscopes Service Manual
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