TM 11-5840-281-35/1
Control settings
Step No. Test equipment Equipment under test
Test procedure
Performance standard
Differential voltmeter
6
As last
WARNING. Be careful when
NULL: VTVM, 10 to 1
indicated ----
performing the procedures In a
in progressive steps.
through e below. Test points
A, B, C, D, E: As
TP103 and TP104 are 130 vdc
required.
above ground potential.
a. None.
a. Connect differential voltmeter
negative (-) test lead to
(-) testpoint TP104 on
Radar Receiver-Transmitter
RT-818/TPN-18.
b. None.
b. Connect differential voltmeter
positive (+) test lead to (+)
testpoint TP103 on Radar
Receiver-Transmitter RT-
818/TPN-18.
c. Voltage indication on
c. On differential voltmeter,
differential voltmeter is
position A, B, C, D, and E
10 times current stamped
controls to obtain null.
on ferrite switch S102.
Example: Ferrite
switch is stamped 450
MA, 450 X 10 = 4500
mv=4.5v.
d. None.
d. Disconnect differential volt-
meter test leads.
Strong radar video returns
7 ------------------- As last indicated, except:
On Control-Indicator, C-6988/
Radar Receiver-
present on azimuth and
TPN-18, observe radar video
elevation displays.
Transmitter RT-
returns on azimuth and eleva-
818/
tion displays.
TPN-18
NOTE. Do not replace covers
SCAN: ON
on Radar Receiver-Transmitter
HV: OPERATE
RT-818/TPN-18 until tests are
Master Pulse
completed.
O-1333/TPN-18
SCAN MODE: NORM
SCAN: ON
TRANSMITTER: Thru
WIDE to HV ON.
IF GAIN-AZ: Fully cw
IF GAIN-EL: Fully cw
EL TARGET: Fully ccw
4-7. Testing Electronic Filters and
(3) Clinometer MP3502 (clinometer)
Pretrigger Frequency
b. Equipment Conditions.
(1) Radar Set AN/TPN-18 turned on.
(2) Front and rear covers removed from
a. Test Equipment Required.
Radar Receiver-Transmitter RT-818/TPN-18.
(1) Multimeter ME-26A/U (vtvm)
(3) Clinometer MP3502 installed on elevation
(2) Oscilloscope AN/USM-140B (oscillo-
Antenna AS1291/TP1--8.
scope).
c. Procedure.
Control settings
Step No. Test equipment Equipment under test
Test procedure
Performance standard
Vivm
Radar Receiver-
a. Manually position elevation
a. None
1
Antenna AS-1291/TPN-18
Transmitter RT-818/
SELECTOR: +
to scan angle of -1 as indi-
RANGE: 10v
TPN-18 control panel
cated on clinometer.
SCAN: OFF
4-8
Previous Page
