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Note:
Before using external decimal point selection,
solder jumper must be removed from digital board.
Location of jumper is at left of base of readout tubes.
Position is dependent on range of instrument.
q
11.
The following table depicts basic conditions which may ex
during the course of normal meter operation.
The example
given is for a one volt range meter.
APPLIED
SIGNAL
INDICATION
SIGNAL
INPUT
ON DISPLAY
OUT-RANGE
VOLTAGE
POLARITY
TUBES
INDICATION
+3.0
Normal
TXXX
42.200
Normal
+.200
+. 000 to 1. 999
Normal
. 000to 1. 999
-. 000to 1. 999
Reversed
. 000to 1. 999
-2.200
Reversed
-3.0
Reversed
12.
Digital Connector:
To maintain the last reading on the display tubes and the
BCD output terminals,
the Model 1292 is equipped with a
display hold contact on digital connector pin 48.
By
closing a switch between pin #8 and pin "J" (Digital GND),
the last display and BCD can be held for as long as de-
Sired.
By opening the switch,
normal operation is re-
sumed.
Synchronization of a number of Model 1292 units
can be obtained by controlling the hold circuitry externall
13.
To maintain the last polarity indication the Model 1292 is
equipped with a polarity hold contact on digital connector
pin #7.
By closing a switch between pin #7 on digital con-
nector and VCC (3.6V) pin "M" on analog connector.
The
last display and logic can be held for as long as desired.
Opening the switch resumes
normal operation.
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