Operation
Measure a Time Interval Defined
by
the B Trigger
1.
Follow the first five steps
of
the procedure
in
"Measure Time
or
Frequency with Delta-Delay-Time: earlier
in
this section.
2.
If the interval is a propagation delay
or
other two-signal measurement,
select
AL
T Vertical Mode and
be
sure A-Trigger Source is a single
channel.
Note that A REF controls the intensified zone on the
CH
1
trace.
3.
Select TRIG A DL Y B-Trigger Mode. For the special case
of
a
measurement on one
signal where the beginning and end
of
the interval
have the same slope and threshold, select TRIG AFT DL Y and TRIG
A DL Y (both indicators on).
4.
Set B-Trigger Source to VERT. If the measurement is limited to one
signal and more than one signal is displayed, either deselect the other
signals
or
set Source to the appropriate channel.
5. Set B-Trigger Coupling
to
DC. For unusual applications, other couplings
may be preferred.
6.
Press INIT@50%. If necessary, adjust LEVEL for the desired trigger
threshold.
7.
Select TRIG AFT DLY Mode and repeat step 6. (For the special case
noted
in
step
3,
skip this step.)
8.
If required, readjust A REF and A to intensify the transitions that mark
the beginning and end
of
the interval. In some cases, A-Trigger
or
B-
Trigger settings may need to change
in
order
to
trigger on the beginning
of
the interval.
9. Turn SEC/DIV clockwise
to
magnify the ends
of
the interval and
readjust LEVEL as required
to
superimpose them. (Skip this step if
signal transition times are much shorter than the required accuracy.)
10. Read the measurement from the readout when "SET" disappears.
2465A/2455A/2445A Operators 2-19
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