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Section III
Model 8012A
SECTION III
OPERATING INSTRUCTIONS
3-1
INTRODUCTION
3-2
Figure 5-1
shows the location of the
controls and connectors; the reference numbers used
appear when appropriate in the following text in bold
type. As previously explained, there are three operating
modes and the necessary operating procedure for each
will now be described. Reference may also be made to
the block diagram, figure 5-2.
3-3
NORMAL MODE
3—4
There are five ways of operating in the
normal mode:
1. Where the repetition rate is determ¬
ined by the internal oscillator, inter¬
nally triggered.
2. As above, but with the oscillator
triggered externally.
3.
Manually triggered,
4.
In each of the above, square wave
output (pulse width = pulse period/2)
may
be
selected
instead
of
the
variable pulse width.
5. The outputs obtained above may be
gated.
All
output pulses are preceded by a trigger pulse
(TRIGGER OUTPUT socket 17). The delay is fixed at
35nS for square waves but may otherwise be adjusted by
the PULSE DELAY switch 6 and VERNIER 7.
3-5
Internal Trigger
3—6
The appropriate circuits and controls are
shown in figure 3-1. Use the following procedure to
obtain an output similar to that shown in figure 3—2.
a.
Set the Mode Selector 21 to N.
b. Set the PULSE PERIOD switch 1 to
the range required, then adjust the
VERNIER 2 to obtain the exact pulse
period.
c.
Set the PULSE DELAY switch 6 to
the range required, then adjust the
VERNIER 7 until the delay time
required
between
the trigger and
output pulses is obtained. The delay
time must always be less than the
pulse period.
d.
Set the PULSE WIDTH switch 10 to
the range required, then adjust the
VERNIER
11 to obtain the exact
pulse width.
e.
Set the AMPLITUDE switch 4 to the
range
required,
then
adjust
the
VERNIER
9
to obtain the exact
amplitude.
f.
Set the TRANSITION TIME switch 3
to the range required, then adjust the
RISETIME vernier 8 and FALLTIME
vernier 12 for the exact risetime and
falltime required.
g.
Set the POLARITY switch 19 to the
position + to obtain positive output
pulses or to — to obtain negative
output pulses,
h.
If the baseline of the output pulses is
to be zero volts, set the OFFSET
switch 13 to OFF.
If the baseline is to be positive or
negative, set the OFFSET switch 13
to ON and rotate the vernier 14 until
the
required
offset
voltage
is
obtained.
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Figure 3-1 Operation Block Diagram: Normal Mode -
Internal Trigger
Page 3—1
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