TM 11-6625-486-14&P
Control Settings
Step
No.
Test Equipment
Equipment under test
Test Procedure
Performance Standard
CN-16/U:
CN-16/U:
1
Voltage control: 103.
FUNCTION SW: OPER. a. Adjust voltage control until
a. None.
TS-352B/U:
RANGE SW: B.
output measured on TS-
FUNCTION:
AC
DIAL LOCK: 5000 kHz
352B/U is 103 volts.
VOLTS.
(5 MHz).
b. Allow AN/USM-26(*) to
b. None.
Range sacle: 250V AC.
AUDIO GAIN: As
warm up for 15 minutes
AN/USM-26(*):
required.
before proceeding.
POWER: ON.
FUNCTION:
FREQUENCY.
STD FREQ: 10 MC.
STD GATE TIME: 1.
MIXING FREQ. MCS:
0.
AN/USM-159(*)
c. Adjust control to obtain a
c. None.
heterodyne beat difference
frequency between 2,000
and 4,000 Hz as indicated
on AN/USM-26(*).
d. Record frequency readout on
d. None.
AN/USM-26(*) and
proceed to step No. 2.
CN-16/U:
CN- 16/U:
2
Voltage control to 230V.
Same as step No. 1.
a. Adjust voltage control until
a. None.
Same as step No. 1.
output measured on TS-
352B/U is 230 volts.
b. Observe readout frequency
b. Frequency indication should
on AN/USM-26(*) and
be same as in step a above
compare with indication in
within '+ 0.005%.
step No. 1.
3
Same as step No. 1.
Same as step No. 1.
a. Unplug power cable from a. None.
power outlet.
b. Observe readout frequency
b. Frequency indication should
on AN/USM-26(*) and
be same as in step No. 1
compare with indication in
above within0.005%.
step 1.
4
Same as step No.1
Same as step No. 1.
Same as step No. 1.
None.
except:
RANGE SW: C.
DIAL: 80 MHz.
5
Same as step No. 1
Same as step No. 4.
Same as step No. 2.
Frequency indication should be
the same as in step No. 1
above within 0.005 %.
6
Same as step No. 1.
Same as step No. 4
Same as step No. 3.
Frequency indication should be
the same as in step No. 1
above within 0.005%.
6-33. Crystal Oscillator Frequency Test
b. Test Connections and Conditions.
Remove
Frequency Meter FR-149(*)/USM-159 from its case and
connect the equipment as shown in figure 6-17.
AN/USM-26(*) with Frequency Meter Subassembly MX-
1637A/U.
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