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Model 5304A
Operation
Figure 9D-3-7. Making Time Interval Measurements (Continued)
b.
If the input signals are pulse trains,
it is possible to select a pulse out of
the train by increasing the DP]LAY
from full ccw; the measured time
interval will increase in steps as the
delay falls after successive pulses
in the train.
c. For maximum flexibility and ease of
interpretation, an oscilloscope may be
used to set up the measurement (as
shown in Figure A).
The DELAY
OUTPUT is used to trigger (he time
base and intensity modulate the dis-
play (see Figure A). For a repetitive
waveform, the Channel A input may
fall during the display cycle, and
therefore might not initiate a meas-
urement. The GATE output may be
substituted for the DELAY OUTPUT;
this allows intensifying the actual
measurement rather than the delay.
If the inputs are common, the GATE
OUTPUT or DELAY O U T P U T can
be displayed on the second channel
(or a third channel of a four-channel
scope), and the other of these two
used to intensity modulate.
d. Set oscilloscope controls as follows:
HP 1801 A:
Set A and B Channel
controls for a display of both input
signal. Set DISPI AY to A+B.
HP 182!A:
Set TRIGGER to EXT.
SLOPE to -.
Coupling to ACF.
SWEEP MODE to NORM.
Time/CM for one cycle of measured
Time Interval.
e. Set DELAY slightly out of full ccw
and selcct the time interval delay.
The SWEEP TIME may have to be
readjusted.
f. Adjust INTENSITY to view only the
time interval measured.
g. Oscilloscope time display and 5300A
time readout should be the same.
Figure B: Example of Delay Control
CH A
INPUT
SIGNAL
CH B
INPUT
SIGNAL
GATE
SIGNAL
DELAY
OUT
S I G N A L
J U L
'
I
{
I
'
I
. T I M E INTERVAL
HOLDOFF
DELAY
TIME INTERVAL DELAY
SETTING
Figure A: Delay Control Setup
1
'DELAY OUT i
5 0 OHM
TERMINATIONS
EXT
INPUT
T I STOP SIGNAL
T. 1. START SIGNAL
S I G N A L
SOURCE
H P I 8 0 A
OSCILLOSCOPE
9! KM)
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