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HP 5304A Operating And Service Manual page 20

Timer/counter

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Model 5304 \
Operation
l(REAR)
AUTO
Figure 9D-3-7. Making Time Interval Measurements
1.
Connect ac power to 5300A ac receptacle.
6.
2.
Turn ac power "on" with 5300A SAMPLE
RATE control.
Adjust sample rate for
desired display time.
3.
Set "Function" switch to T.I. A to B,
with desired resolution.
Ensure DELAY
control is full ccw.
4.
Set ATTEN switches for both channels to
XI00; AC-DC switches and SLOPE controls
switches to settings desired; set LEVEL
controls to PSET.
5.
If Start and Stop signals are from separate
sources, connect the Start signal to INPUT
A connector and the Stop signal to INPUT
B connector, then set the COM-SEP-CHK
switch to SEP.
If the Start and Stop
signals are from a common source, connect
the signal input to INPUT A and set the
COM-SEP-CHK switch to COM.
Adjust ATTEN switches until a stable dis-
play is obtained.
Time Interval Holdoff (DELAY).
The
I)p]LAY control inserts a delay of about
100 psec to 100 msec between the triggering
of the START Channel "A" and the en-
abling of the STOP Channel "B" (see
Figure B).
This delay may be used to
measure
relay
or
other
mechanical
switch timing sequences without
error
due to contact bounce.
It may also be
used for measurements on pulse trains;
for example from the start pulse to a later
pulse, in the presence of intervening pulses.
To use the DELAY, proceed as follows:
a.
If the desired delay is known, it
may
be set
and
measured
by
selecting T.I. A to B and CHK and
setting DELAY control to the desired
delay time.
The measurement may
then be made by switching COM-
SEP-CHK in step 5.
9D-3-8

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