Checks and Adjustments
Matching Channel
2
Delay
The apparent signal delay in Channel 2 may be adjusted up to ±
500
ps to
match the apparent delay present in any of the other three channels. This
adjustment is most commonly used to eliminate delay differences between Channel
1 and Channel 2 that may be introduced by the probes. It has no effect on
common-mode rejection when ADD Vertical Mode is selected. It also has no effect
on time interval measurements with either the CTT or Parametric Measurements.
Match Channel
1
and Channel 2 as follows:
1.
Connect two 10X probes supplied with the instrument to the CH
1
OR X
and CH 2 inputs.
2.
Check and adjust, if necessary, the probe's low-frequency compensation.
Refer to "Probe Compensation" in this section.
3. Connect both probes via hook tips to the same fast-rise pulse generator
output.
4.
Select both CH 1 and CH 2 Vertical mode displays.
5. Press AUTO Setup to obtain a display.
6. Set the CH
1
and CH 2 VOLTS/DIV and POSITION controls for 3 to
6 divisions of amplitude and superimposed displays.
7. Set SEC/DIV to 5 ns.
8. Pull the SEC/DIV knob and observe the message CH 2 DELAY—TURN A
in the upper right-hand corner of the screen.
NOTE
If
the message CH
2 DLY DISABLED
appears
in
the
readout,
the instrument
has been set to
disable
the
delay-offset adjusting
feature.
If
adjustment
of
the delay
matching
is
disabled,
refer the
adjustment
to a qualified
service
technician.
9. Set X10 MAG On and adjust the A control until the two fast edges are
superimposed horizontally.
NOTE
The
J
REF OR DL Y POS
control
can
also be
used
to
make
the
adjustment.
10.
Push in the SEC/DIV switch. The adjustment is then permanently stored for
future operation, even when power is interrupted.
2465B/2455B/2445B Operators
4-5
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