 |
|||
|
|
|||
|
Page Title:
Calibration of Receiver Meter 2A15A2M1 |
|
||
| ||||||||||
|
|  TM 11-5820-695-35
cabinet 2A15 (fig. 3-20).
f.
Observe the LEVEL METER on AN/USM-
i.
On TS-656/U, hold the TEST switch in
207. If it reads in the green zone, proceed to step h
TEST (up) position and turn the DECREASE/
below. Otherwise, proceed to step g below.
INCREASE control in INCREASE direction (clockwise)
g.
Alternately set the upper and lower
until meter 2A15A2M1 indicates 200.
converter attenuator switches on AN/USM-207 to the
j.
With the TEST switch on TS-656/U in the
left, one position at a time, until LEVEL METER
up position, the TS-656/U meter should indicate 60 +e.0
indication is in the green zone.
microamperes. If it does not, replace meter 2A15A2M1
h.
On the front of radio transmitter modulator
1A8, remove the blue caps on switch S1 and capacitor
k.
Turn the TS456/U off and disconnect the
C15. Press switch S1 and hold it depressed while
test leads.
performing step i below.
l.
Set POWER ON/OFF switch 2A15A2S2 on
i.
Using the tuning tool, adjust capacitor C15
meter panel assembly 2A15A2 to ON.
(clockwise to reduce frequency; counterclockwise to
increase frequency) for a 50 MHz +5 kHz digital display
3-64. Calibration of R-1467(P)/GRC-144 (V) and R-
on AN/USM-207.
1467(P)A/GRC-144(V) Traffic Metering Circuit
j.
Release switch S1. Digital display on AN/
a.
Set POWER ON/OFF switch 2A15A2S2 on
USM-207 shall be 50 MHz +20 kHz. If it is not, repeat
meter panel assembly 2A15A2 to OFF.
steps h and i. If repeated attempts to adjust the
b.
Remove alarm monitor 2A12 from plate
modulator frequency within 50 MHz +20 kHz fails, refer
assembly 2A16 (TM 11-5820-695-12)'.
to the troubleshooting chart (para 3- , item No. 35) for
b
corrective action.
c.
Turn Test Set, Electrical Meter TS-656/U on
and allow a 5-minute warmup period.
k.
Replace the blue caps removed in step h.
d.
On the TS-656/U, set the FUNCTION switch
l.
Turn off the AN/USM-207 and disconnect
to DIR CUR, the CURRENT switch to 100 MICRO-AMP,
the test equipment.
and turn the DECREASE/ INCREASE control fully
m.
Connect coaxial cable 1A6W2 to the J1
counterclockwise until mechanical stop is reached.
connector on radio transmitter modulator 1A8.
e.
Connect the connector adapter (part of MK-
n.
Connect coaxial cable 1A8W1 to the A1J1
1207/GRC) to connector 2A16WlXA12A (fig. 3-18).
connector on transmitter frequency mixer stage 1A9.
f.
Connect the red test lead' supplied with
3-63. Calibration of Receiver Meter 2A15A2M1
TS656/U between the DIR CUR terminal on TS656/U
a.
Set POWER ON/OFF switch 2A15A2M1 on
and the red test. jack on the connector adapter.
meter panel assembly 2A15A2 to OFF.
g.
Connect the black test lead supplied with
b.
Turn meter selector switch 2A15A2S1 on
TS-656/U between the COMMON terminal on TS-656/U
meter panel assembly 2A15A2 to OFF (TRANSIT).
and the black test jack on the connector adapter.
c.
Using a screwdriver, adjust the screw on the
h.
Turn meter selector switch 2A15A2S1 on
front of meter 2A15A2M1 for a zero meter indication.
meter panel assembly 2A15A2 to TRAFFIC.
d.
Turn meter selector switch 2A15A2S1 on
i.
On TS-656/U, hold the TEST switch in
meter panel assembly 2A15A2 to TEST LEAD (+).
TEST (up) position and turn the DECREASE/
INCREASE control in INCREASE direction (clockwise)
e.
Turn Test Set, Electrical Meter TS-56/U on
until a reading of 50 microamperes is observed on TS-
and allow a ,5-minute warmup period.
656/U meter.
f.
On the T656/U, set the FUNCTION switch
j.
Remove the protective plate over the
to DIR OUR, the CURRENT switch to 100 MICRO-AMP,
potentiometer bracket and adjust potentiometer
and
turn
the
DECREASE/INCREASE
control
2A15A2R7 (fig. 3-18) for a 2A15M1 meter indication of
counterclockwise until mechanical stop is reached.
100. If a meter indication of 100 cannot be obtained,
g.
Connect the red test lead supplied with TS-
refer to the troubleshooting chart
66/U between the DIR CUR terminal on T656/U and the
TEST LEAD jack on meter panel assembly 2A15A2.
h.
Connect the black test lead supplied with
TS-656/U between the COMMON terminal on TS-656/,U
and the E2 CAB GRD lug on top of electrical equipment
Change 6
3-80
|
|
Privacy Statement - Press Release - Copyright Information. - Contact Us |
Click
here for thousands of PDF manuals