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. Match Channel 1
and
Channel 2
as
follows:
4-4
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 a 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 VOL
TS/mV
and POSITION controls for 3
to
6
divisions of
amplitude and superimposed displays.
7. Set SEC/DIV to 5
ns.
8.
Pull
out 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
DL
Y 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
X1
0 MAG
On
and adjust the A control until the two fast edges are
superimposed
horizontally.
NOTE
The
.d
REF
OR DL Y
pas
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.
2465A/2455A/2445A Operators
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