TM 11-5820-890-30-4
3-8.
TEST ADAPTER. Continued
Table 3-1. Test Adapter Switches Continued
NAME (NUMBER)
LOGIC (S4)
STIMULUS (S5)
RESPONSE (S6)
MOD GEN (S7)
LOAD (S8)
TEST EQPT
INPUT (S9)
CAL (S12)
PTT (S13)
STIM SEL (S14)
RESP SEL (S15)
FUNCTION
Selects different combinations of voltage and GND to be sent to UUT.
Selects paths for input of function generator or handset signals into
UUT or REF RT.
Two-deck switch which selects signal from UUT or REF RT for testing
by the test equipment.
When ON, this switch routes the function generator’s modulation
generator output to the UUT.
Sets resistance loads on the test equipment measurement inputs.
The loads are:
1
620 ohms
2
510 ohms
3
220 ohms
4
150 ohms
The load resistors are mounted on the test adapter power supply CCA.
Selects between testing signals from external probe or from RESPONSE
switch.
Selects to send either the function generator or the modulation
generator signal to the frequency counter and scope 2 for calibration.
Provides Push-To-Talk (PTT) signal (GND) to UUT or REF RT.
Selects either function generator or handset signals to be sent to
STIMULUS switch.
Selects deck 1 or deck 2 of RESPONSE switch for source of test signals.
g. Test Points. There are 12 TEST POINT jacks mounted on the front panel. They provide access to test
adapter signals. The test point signals are:
TEST POINT
SIGNAL FROM
TP1
Pin F of UUT connector
TP2
Pin b of UUT connector
TP3
TP4
TP5
TP6
TP7
TP8
TP9
TP10
TP11
TP12
Not connected
Test power supply input: 27.5 V dc
Pin V of UUT connector
Test power supply input: 27.5 V dc
28 V switch output: 27.5 V dc when ON
Voltage regulator U3 output: 13 V dc
13V switch output: 13 V dc when ON
Voltage regulator U1 output: 6.75 V dc
Voltage regulator U2 output: 5 V dc
Chassis ground
3-19
