TM 11-6625-486-14&P
Control Settings
Step
No.
Test Equipment
Equipment under test
Test Procedure
Performance Standard
1
AN/USM-26(*)
POWER: ON.
FUNCTION SW: CHK
Observe readout frequency on
Frequency should be between
FUNC T I O N:
RANGE SW: A.
AN/USM-26(*).
999,995 and 1,000,005 Hz.
FREQUENCY.
STD FREQ: 10 MC.
STD GATE TIME: 1.
MIXING FREQ. MCS:
0.
2
Same as step No. 1. FUNCTION SW: CHK
Observe readout frequency on
Frequency should be between
RANGE SW: C.
AN/USM-26(*).
2,499,988 and 2,500, 012
Hz.
6-34. Crystal Checkpoint and Vfo Calibration
c. Procedure. Follow the procedures given in
a. Test Equipment and Materials. Headset H-
216/U.
b. Test Connections and Conditions. Plug in headset.
Step
Equipment under test
No.
Control settings
Test Procedure
Performance Standard
1
FUNCTION SW: CHK.
a. Allow equipment to warm up for 5
a. None.
RANGE SW: A.
minutes before proceeding. Plug
in Headset HS-216/U.
b. Starting from 125-kHz checkpoint,
b. Zero beat should be obtained at
adjust TUNING knob and
each checkpoint.
CORRECTOR control for a zero
beat on all checkpoints within
range A of filmstrip.
2
FUNCTION SW: CHK.
Starting from 5,000-kHz checkpoint,
Zero beat should be obtained directly
RANGE SW: B.
Adjust TUNING and
at each checkpoint.
CORRECTOR controls for zero
beat on all checkpoints within
RANGE B of the filmstrip.
3
FUNCTION SW: CHK.
Starting from 130-MHz checkpoint,
Zero beat should be obtained directly
adjust TUNING and
at each checkpoint.
CORRECTOR controls for zero
beat on all checkpoints within
range C of filmstrip.
Frequency Meter FR-149(*)/USM-159 from its case and
6-35. Frequency Range of Corrector
connect the equipment as shown in figure 6-18.
a. Test Equipment and Materials.
Frequency
Meter
AN/USM-26(*)
with
Frequency
Meter
Subassembly MX-1637A/U.
b. Test Connections and Conditions. Remove
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