HP AC-4A User Manual

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Resetting all Decade Counters to NINE (or more properly -1) may
be desirable if the operation of a gate circuit puts an extra pulse
into the counter circuits. A manual pushbutton used with this
circuit should be connected to supply a positive pulse to the IN-
PUT of the Reset Thyratron.
680
INPUT 0>--------111---------"I
_j_ R21
470K
-195
+300
RESET PULSE
TO
AC-4A
(BASE PIN 2)
---y-
1000
IN34
500
Fig. 9.
Circuit to Reset AC-4A Decade Counter Units to Nine
NOTE:
A positive pulse at the input to this circuit delivers
a 200 volt negative reset pulse with fast fall and
slow rise to reset all AC-4A Decade Counters to
NINE simultaneously. This circuit will function
if R21 is removed and R20 is returned to approxi-
mately -30 volts.
The AC-4A can be reset to NINE with a manual push-
button if the leads connecting the GND and RESET
buses to the base plug are reversed where they join
the printed circuit board. Refer to the reset cir-
cuit of Fig. 8 for details .
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12/58

HP AC-4A Specifications

General

Brand	HP
Model	AC-4A
Category	Cash Counter
Language	English