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 ALT 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 DLY 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 DLY and TRIG
A DLY (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. If two channels are
used,
only those two channels should be displayed.
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.
2-24
2465B/2455B/2445B Operators
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