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 3.3.3
(Cont'd)
B. Rear Panel Connections (Cont'd)
EXT. COUNT ON/OFF - Consecutive contact closures may be used on this line to start and stop
the GATE interval. Contact closures should be made to COMMON. Bounce protection is
provided. Reset occurs automatically at the end of display time.
C. Rear Panel Controls
A/FLOW Switch - Not used in this mode.
EXT. T. B./INT. T. B. Switch - See Section 3.3.1, E.
3.3.4
TEST
With the selector switch in the TEST mode, the counter accumulates counts at a selected rate for the
duration determined by the setting of the thumbwheel switches.
A. Readout
The TEST mode of operation displays the number of repetitive occurrences of an internally
generated signal accumulated over the duration of the gate time set in the thumbwheel switches.
Reset occurs automatically at the end of the cycle and a new count begins. (See DISPLAY TIME
Control below.)
B. Test Frequency Selection
This is accomplished only by the front panel multiplier switch (X1, X10, X1000).
The count
frequencies for the various positions are:
X1
100
KHz
X10
10
KHz
X100
1
KHz
X1000
100
Hz
C. Other Front Panel Controls
RESET Pushbutton - See Section 3.3.1, C.
DISPLAY TIME CONTROL - Adjust for desired time setting. At conclusion of display, reset occurs
automatically and the internal logic is prepared to accept a new start pulse. When in HOLD
position, only one reading will be taken and reset must be actuated manually or by remote
methods in order to prepare for a new count cycle.
3-8
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