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the video input to the UUT and to measure the video output
from the VMU tuner. This keeps the effect of the
oscilloscope precision to a minimum.
(2) Connection of UUT and PC
(a) Connect the test harness to the J1 connector of the UUT.
(b) Connect the test harness to the J1, J2, and RF1 thru RF4
connectors of the tester.
(c) Connect the P3 connector of the test harness to the RS-232C I/F
connector of the tester.
T&FI-2
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Matsushita Avionics Systems Corporation
COMPONENT MAINTENANCE MANUAL
PART NUMBER RD-AA5002 SERIES
23-32-47
WARNING: TO PREVENT ELECTRICAL SHOCK, MAKE SURE THAT THE FRAMES AND EXTERNAL
METAL PARTS OF TEST EQUIPMENT ARE CORRECTLY GROUNDED.
PERSONAL
VMU TESTER
VMU
TEST HARNESS
RD-AM9341-02
RF OUTPUT
RF1
J1
J1
COMPUTER (PC)
COM1/2
RF2
RF3
RF4
J2
RS232C I/F
RF1
RF2
RF3
RF4
TO VMU
50
TERMINATORS
AC POWER IN
115 V, 400 Hz
RD-AX8308
SPECTRUM
ANALIZER
RD-AX8308-01
VMU TUNER
RF IN VIDEO OUT BNC TEE
BNC TEE
RFC1
20 dB RF
ATTENUATOR
RFC2
RFC3
OSCILLOSCOPE
CH1
*3 T2
VIDEO MONITOR,
75-OHM INPUT
MONITOR
AC POWER IN
115 V, 400 Hz
50 INPUT
VIDEO
GENERATOR
VIDEO INPUT
PATTERN
CH1 THRU CH12
75
OUT
T1
OUT
50
IMPEDANCE
CONVERTER
IN RD-AM8285
*2
AC POWER IN
115 V, 400 Hz
*1
*1
W
W
RD-AM8285-01
75W
RS232-RS485
SELECTOR
PERSONAL
COMPUTER (PC)
COM1/2
IF COM1/2 CONECTOR IS
25-PIN TYPE:
IF COM1/2 CONECTOR IS
9-PIN TYPE:
SERIAL PORT
ADAPTER
(25P TO 9P)
IMPEDANCE
SELECTOR
P3
P4
P4
W W
VC4
IN OUT
VC1
VC2
VC3
RS232-RS485 SELECTOR
INCLUDED IN TEST HARNESS
TOP RIGHT
FRONT VIEW
IS SHOWN IN
CORNER.
CABLE
OFF
ON
POWER
RS232
RS485
RD-AM9341-02
P1
P2
RS-232 NULLMODEM
CABLE
*1- IF YOU USE AN NTSC VIDEO PATTERN GENERATOR, USE AN NTSC VIDEO MONITOR. IF YOU USE A PAL
VIDEO PATTERN GENERATOR, USE A PAL VIDEO MONITOR.
*2- THE RD-AM8285 IMPEDANCE CONVERTER IS NOT NECESSARY IF THE OUTPUT IMPEDANCE OF THE VIDEO
PATTERN GENERATOR IS 50 W.
*3- YOU CAN USE YOUR RF VIDEO RECEIVING EQUIPMENT (TOSHIBA TT-GC9 OR TT-GC10 TV TUNER, VCR,
ETC.) THAT YOU USE FOR TESTING OF THE RD-AA5002 SERIES VIDEO MODULATOR UNITS AS AN
ALTERNATIVE FOR THE RD-AX8308-01 VMU TUNER.
FUNCTIONAL TEST SETUP
Figure 111
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COMPONENT MAINTENANCE MANUAL
PART NUMBER RD-AA5002 SERIES
23-32-47
(d) Connect the P4 connector of the test harness to the RS-232 nullmodem
cable.
(e) Connect the RS-232 null-modem cable to the serial port (COM1 or
COM2) of the PC as follows:
PC's SERIAL PORT CONNECTION
25-Pin Type Directly connect the cable connector to the
PC's serial port.
9-Pin Type Connect the cable connector to the PC's
serial port through a serial port adapter
cable (DB-25M to DB-9F).
(f) Make sure that the PC is prepared as given in A. above.
(3) RF Output Connections
(a) Connect the RF OUTPUT RF1 connector of the tester to the input
of the spectrum analyzer with an RF cable (RFC1).
(b) Connect the RF OUTPUT RF2 connector of the tester to the input
of the 20-dB RF attenuator with an RF cable (RFC2).
(c) Connect the output of the 20-dB RF attenuator to the RF IN
connector (input) of the VMU tuner with an RF cable (RFC3).
(d) Connect a BNC tee adapter T2 to the VIDEO OUT connector of the
VMU tuner.
(e) Connect the input of the video monitor to the BNC tee adapter T2
with a video cable (VC5).
(f) Disconnect the RFC2 cable from the RF OUTPUT RF2 connector of
the tester.
(g) Connect BNC 50-W terminators to the RF OUTPUT RF2, RF3 and RF4
connectors of the tester.
T&FI-2
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Matsushita Avionics Systems Corporation
COMPONENT MAINTENANCE MANUAL
PART NUMBER RD-AA5002 SERIES
23-32-47
C. Warm-up and Adjustments
(1) Initial Conditions
(a) Make sure that the power switches of all units in the test setup
are set to OFF.
(b) Set the switches as follows:
Impedance Selector
SWITCH POSITION
Impedance selector 50W
RS232-RS485 Selector of Test Harness
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COMPONENT MAINTENANCE MANUAL Video Modulator Unit (VMU)(64)
