Operating Procedures for Differential Test

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specified by the calibration book for the unit under

the transmitter under test to test adapter cable G

test.

(QB86030-1).

j. C h e c k t o s e e t h a t i n d i c a t o r B 2 0 2 t r a c k s t h e t e s t

c. C o n n e c t p o w e r s o u r c e c a b l e F ( Q B 8 6 0 3 2 - 1 ) f r o m

the disconnect aircraft cable to adapter cable B

transmitter

within

acceptable

tolerances.

(QB86063), and connect the adapter cable to POWER-

k. T u r n P O W E R 1 7 s w i t c h S 2 0 4 t o o f f .

INPUT 10 connector.

l. D i s c o n n e c t a l l t e s t c a b l e s .

d. S e t T E S T S E L 2 s w i t c h t o T R A N S .

m. Reconnect the aircraft cable to the transmitter

e. With aircraft power available, set POWER 17

under test.

switch to ON. Check to see that POWER 16 indicator

Operating

Procedures

for

Differential

lights. Allow the test aet a l-minute warmup interval.

Test

f. C h e c k f o r 2 6 v o l t s a c 1 0 p e r c e n t a c r o s s 2 6 V

The operating procedure for differential test is identi-

b i n d i n g posts 18 and 19.

cal with the transmitter test (para 2-9) except the

g. Check for 10,8 volts sc 10 percent across 10.8V

TEST SEL 2 switch is set to DIFF.

b i n d i n g posts 19 and 20.

Operation

Under

Unusual

Conditions

h. R o t a t e A M P L I F I E R G A I N 8 c o n t r o l f u l l y c l o c k -

wise.

Operation under unusual conditions does not differ

from those procedures used for normal operation.

i. R o t a t e t h e t r a n s m i t t e r u n d e r t e s t t o t h e a n g l e s

2-5