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Page Title: Table 2-2. Digital Tester Controls. indicators, and Connectors
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TM 11-6625-2937-13
Table 2-2. Digital Tester Controls, Indicators, and Connectors-Continued
Control, indicator, or connector
Function
TEST RATE PER SEC switch
Eight-position rotary switch that controls test pattern rate. Switch setting of 100, IOK (10
thousand), 100K, 200K, 400K, 1M (1 million), 2M, or 4M can be selected.
NUMBER OF TESTS switch
Twelve-position rotary switch that controls number of tests performed during test sequence.
Switch setting of IOK (10 thousand), 20K, 40K, 100K, 200K, 400K, 1M (1 million), 2M,
4M, 10M, 20M, or 40M can be selected.
DISPLAY switch
Twenty-position rotary switch that controls which input and output signals of card under test
contribute to count indicated on counter display. In PASS/FAIL position, all input and out-
put signals of card under test contribute to count on counter display. In positions 1-8
through 121-128, only input and output signals of card under test for pins corresponding to
switch setting contribute to count on counter display. IN + PULSE WIDTH or - PULSE
WIDTH position, counter display is appropriate positive or negative pulsewidth in microsec-
onds. In PROBE position, only input counts from logic probe are indicated on counter dis-
play.
PASS/FAIL indicators
Red FAIL indicator comes on when card being tested fails est. Green PASS indicator comes
on when card being tested passes test. PASS/FAIL indicators operate only when DISPLAY
switch is set to PASS/FAIL.
PROBE THRESHOLD switch
Five-position rotary switch that selects minimum voltage threshold required to activate logic
probe. Switch setting of IV, 2V, 5V, 7V, or 9V can be selected. Setting normally used is 2V
(TTL). Other settings are used with other logic families.
Counter display
Provides eight digit display of total transition counts or pulse-width in microseconds after test
sequence, depending upon setting of display switch.
READY/ERROR indicator
Lights (white) when test program has been loaded into tester correctly or duplicate action is
completed. Red READY/ERROR indicator is on if no program is currently in tester memo-
ry, test program has been loaded into tester incorrectly, or power dropout has occurred.
PROGRAM ENTER switch-indicator
Pressing this momentary switch to down position loads program on program card in card reader
slot to be loaded into tester memory. Red indicator is on during program enter period.
Card reader slot
Provides interface between program card and tester. Programs may be loaded into tester from
program card, or programs previously loaded into tester memory may be duplicated on
blank cards.
DUPLICATE switch
Keylock switch that provides capability of duplicating program previously loaded into tester
memory on magnetic stripe of program card
LOCKED/OPEN lever
In OPEN position, allows connector adapter to be inserted into or removed from interface con-
nector. In LOCKED position, locks connector adapter to interface connector.
Interface connector
Provides interface between control-interface unit and digital tester.
Logic probe
Indicates logic levels in card under test. Also provides input to digital tester to permit monitor-
ing transition counts or pulse-widths (positive or negative). Lamp near tip of logic Probe is
off when logic 0 (negative voltage or ground) is probed. Lamp is on when logic I (positive
voltage or open) is probed. Lamp flashes at I 0-Hz rate when pulse are present at probe in-
put.
10A FAST fuse holder
Houses 10-ampere, 125-volt line fuse.
115-230 VAC 47440 Hz power receptacle
Provides for connecting line power to tester.
EXTERNAL POWER SUPPLIES receptacle
Provides for connecting external power to unit under test via front panel interface connector
and connector adapter.
PROGRAMING PANEL interface connector
Provides interface between tester and optional programming panel.
2-7

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