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  TM 11-6625-539-14-4
7-25. Test Set Safety Check
than 100 millivolts may be considered
insignificant.
These safety checks determine if the power ap-
plied to the device under test is within limits that
a. Test Equipment and Materials.
are safe for the device. Check power in all modes
(1) Multi meter AN/USM-223.
of operation described below.
(2) Resistor, Decade ZM-16/U.
b. Test Connections and Conditions. As indi-
NOTE
cated below.
During all device safety checks, measure
c. Procedure.
both ac and dc voltages. Voltages of less
Control settings
Step
Test procedures
Performance standard
No.
Test
Equipment
under test
equipment
1
Multimeter: AC
Record voltage across jacks in
FUNCTION switch:
Measure voltage between B, G
VOLTS and DC
BETA mode.
BETA.
and E, S remote test jacks.
VOLTS.
R A N G E switch: X
0.1.
POLARITY switch:
PNP or NPN.
2
ZM-16/U: 100 ohms.
If voltage is half or more than
Same.
Connect ZM-16/U across B, G
that measured in step 1, cal-
and E, S remote test jacks.
culate power using formula:
Check voltage across jacks.
If voltage is less than half of
that noted in step 1, increase
setting of ZM-16/U until volt-
age is one-half that noted in
step 1 and apply values in
above formula to determine
power. Total power shall not
exceed 20 milliwatts.
3
Total power shall not exceed 20
Same.
R A N G E switch: X
Repeat steps 1 and 2 in remain-
milliwatts in any range.
1.0 and X 10.
ing two ranges.
Total power shall not exceed 20
4
` ame.
Same.
S
Repeat steps 1 through 3 and
milliwatts in any range of
check voltage across C, D and
B, G remote test jacks, then
any jack combination.
across C, D and E, S jacks.
V o l t a g e in OHMS function
5
FUNCTION switch:
Measure voltage across B, G
Multi meter: AC
must be less than 100 milli-
VOLTS and DC
OHMS.
and E, S remote test jacks.
volts.
POLARITY switch:
VOLTS.
E-B.
R A N G E switch: X
0.1.
I C E S ZERO/OHMS
ADJ: fully CW.
Voltage must be less than 100
6
Measure voltage across C, D
Same.
Same except PO-
millivolts.
LARITY switch:
and B, G remote test jacks.
C-B.
Voltage must be less than 100
7
Same except PO-
Measure voltage across C, D
Same.
millivolts.
LARITY switch:
and E, S remote test jacks.
E-C.
Record voltage across jacks in
8
FUNCTION switch:
Multi meter: AC
Measure voltage across B, G
FET mode.
VOLTS and DC
FET.
and E, S remote test jacks.
POLARITY switch:
VOLTS.
NPN or PNP.
R A N G E switch. X
0.1.
Determine power by applying
ZM-16/U as required.
9
Same.
Connect ZM-16/U B, G and E, S
f o r m u l a given in step 2.
r e m o t e test jacks. Adjust
Power must not exceed 20
ZM-16/U so that voltage is
milliwatts.
one-half that noted in step 8.
7-16
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