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Operating Instructions; Initial Control Settings; Normal Mode; Trigger Mode - HP 8081A Operating And Service Manual

300mhz rate generator module
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3-27
In Normal mode, the repetition rate genera-
tor is free-running at the frequency set on the rate con·
trois. The pulse output is the same as on the oscilloscope
(the trigger output is identical to the pulse output). The
pulse duty cycle is 40-60%.
3-20
Set BOB1 A mode switch 3 to EXT. GATE
and press the MAN pushbutton. The repetition rate
should start when the button is pressed and stop when
the button is released. When the button is pressed, i. e.
when the gate opens, the first pulse should always start
at the beginning. However, when the button is released,
i. e. the gate closes, the last pulse may be cut short.
3-26
Normal Mode.
3-21
OPERATING INSTRUCTIONS
3-28
Trigger Mode
3-22
A suggested equipment setup for the Operat-
ing Instructions is shown in figure 3-3.
The B081 A Rate Generator must be mounted in an
BOBOA Mainframe. The following procedure is designed
to give a full understanding of the function of each of
the 8081 A operating modes.
3-23
Set the LINE switch on the 8080A Main-
frame to ON.
3-29
In TRIGGER mode, the repetition rate of
the output is independent of the internal repetition rate
generator. The output is, in fact, a pulse-shaped version
of the input signal. The input can be either external via
the EXT INPUT
(-j)
or local using the MAN pushbut-
ton
®.
For external triggering, an external signal source
is required. The test set is as shown in figure 3-3. The
changes in control settings are as follows.
3-24
Initial Control Settings
8081A
CD
RATE range switch
1 MHz-100 KHz
~
Rate VERNIER
CCW
~
Mode switch
NORM
@
EXT INPUT LEVEL
+1 V
@
NEG-paS-MAN switch
pas
Oscilloscope:
Timebase
2 psec/div
Trigger
Channel A internal
Pulse Generator: switched off.
8081A:
@
Mode switch
TRIG
@
NEG-POS·MAN switch
pas
Pulse Generator:
Switch pulse generator on.
Set pu Ise period to about 15 fJ.sec.
Set pulse width to about 8 fJ.sec.
Set pulse amplitude to 2V and polarity to
pas.
Set the oscilloscope to trigger from chan-
nel B internally.
3-25
modes:
The 8081 A has four different operating
Normal (NORM)
Trigger (TRIG)
External Gate (EXT GATE)
Internal Gate (INT GATE)
3-30
The oscilloscope display should be as shown
in figure 3-4. The 8081 A output should only be
delayed on the external input by the internal circuitry
delay of the 8081 A
EXTERNAL
I
L
INPUT
Ov
-L
I
RATE
ov
II
GENERATOR
-O.6V
I
OUTPUT
II
f
I
I
---J
!--
fixed delay
Figure 3-4. Rate Generator Output in Trigger Mode.

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