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RATE
• - - N H I . -
-k.ti::r-
-"'1:---
300-100-10'" • -100-10 - 1 -100 - 10
1
. 3 3 - 10 • 1 - 1· 10 - , - 1
~
10-\00
PERIOD
VERNIER
2
'f)(T tNPU1 l.fVEL
GATE
!
/::'~
NORM TRIG
EXT
tNt
, . . .,
3
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4
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5..
~AN
6.
=
EXT
INPUT
TRIGGER OUTPUT(-)
o
EXT INPUT LEVEL control: determines the
threshold voltage of the external trigger input.
Adjustable from -1 V to +1 V.
@
NEG-POS-MAN switch: for selecting the slope
polarity and/or source of external trigger signals.
In the POS and NEG positions, signals are appl ied
via the EXT INPUT connector. In the MAN posi-
tion, the MAN pushbutton is used as the trigger.
G)
RATE switch: for selecting the range of pulse
repetition rate.
G
Rate VERNIER: for continuous adjustment of the
repetition rate within the range selected on the
RATE switch. Clockwise rotation increases the
pulse period (reduces the rate).
In
TRIGGER
mode, the rate controls have no effect.
o
Mode switch: for selecting the mode of operation
of the rate generator:
NORM-
rate generator free-running at selected repetition
rate.
TRIG-
rate generator output is shaped version of input.
Input is either via the MAN pushbutton or an
external signal into the EXT INPUT connector.
EXT GATE-
gate signal turns rate generator on synchronously.
Repetition rate as selected on rate controls. Gate
'iignal either via the MAN pushbutton or the EXT
INPUT connector. Max. gate frequency 150 MHz.
INT GATE-
external input is disconnected. Gate signal is pro-
vided internally by the word generator module and
Figure 3-1. 8081 A Controls and Connectors
(~)
turns the rate generator on synchronously. Repeti-
tion rate as selected on the rate controls.
MAN pushbutton: for generat;ng external trigger
signals when in TRIG and EXT GATE modes. The
NEG-POS-MAN switch must be in the MAN posi-
tion.
EXT INPUT connector: DC coupled input to
which external trigger/gate signals are applied.
Input impedance is 50 ohms.
Maximum input
level ;s
±
6V.
TRIGGER OUTPUT connector: provides negative
output pulses in all modes of operation. In TRIG.
mode the output pulses are related to the trigger
input and not the repetion rate generator. Maxi-
mum external voltage ;s ± 2V.
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