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Model 8012A
Section III
Remember the following points about the square wave
output:
Output pulse width equals half the selected pulse period,
Output pulse rate is one-half that of the rate generator
(or input trigger pulse).
The delay between input trigger pulse and square wave
output is fixed.
The output pulse is symmetrical above and below
ground.
3—13
Gating
3—14
The trigger and output pulses obtained in
the
normal
mode may be gated by
applying an
appropriate gate pulse (see specifications) to the GATE
INPUT socket 18; the operation is indicated in figure
3-9.
Figure 3-9 Output Waveforms: Normal Mode - Gating.
3-15
RZ MODE
3-16
External
pulses
(applied to the
INPUT
socket 22 on the rear panel) trigger the delay generator
directly (figure 3-10) and the shape of the output
pulses is determined by the pulse forming circuits
following the delay generator.
The output pulses cannot be gated and, as explained in
paragraph 3—19, are independent of the pulses at the
TRIGGER OUTPUT socket 17.
c.
Set the PULSE WIDTH switch 10 to
the required range, then adjust the
VERNIER 11 for the exact pulse
width.
d.
Set the amplitude, risetime, falltime,
polarity and offset of the output
pulses as described in paragraph 3-6.
OFf$cr >j
VMMW U
Figure 3-10 Operation Block Diagram: RZ Mode.
f~«>.■*1.
i > 7nS
Variable Delay
*
Variable
1
< 36nS to IS.
Width
RZ input pubs period * output pulse period.
RZ input pulses
(INPUT 22!
Positive output pulses
(OUTPUT 20).
Output pulses may also be
negative.The baseline
may be offset.
Figure 3-11 Output Waveform: RZ Mode.
3-17
EXTERNAL WIDTH MODE
The following procedure should be used to obtain
outputs similar to those indicated in figure 3—11.
a.
Set the Mode Selector 21 to RZ.
b. Set the delay between the external
applied pulses and the resulting out¬
put pulses by selecting the range
required
on
the
PULSE
DELAY
switch 6 and adjusting the VERNIER
7.
3-18
External
pulses (applied to the
INPUT
connector 22 on the rear panel) trigger the transition
time circuit (figure 3-12). The output thus obtained
cannot be gated and, as explained in paragraph 3-19, is
independent
of
the
TRIGGER
OUTPUT
17.
The
following procedure should be used to obtain outputs
similar to those shown in figure 3—11.
a.
Set the Mode Selector 21 to EXT.
WIDTH.
Page 3—4
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