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tolerance is 1 Vp-p ± 1% into a specified load (50 or 75 W) for an RF
video input modulated 87,5% with 100% white video.
Some difference in the tuning frequency is permitted if it is in the
range between 151.25 MHz and 283.25 MHz. If you use a different tuning
frequency, you must use that frequency also on the UUT.
In the procedure, the term "VMU tuner" refers to the RD-AX8308-01 VMU
tuner and to the alternative receiving equipment.
B. Test Setup
Refer to Figure 103 for the setup necessary for the functional testing.
CAUTION: MAKE SURE THAT ALL UNITS ARE DE-ENERGIZED BEFORE YOU MAKE THEIR
CONNECTIONS.
(1) Video Input Connection
(a) Connect a BNC tee adapter T1 to the VIDEO INPUT CH1 connector of
the tester.
(b) Connect the output of the video pattern generator to the BNC tee
adapter T1 with a video cable (VC1).
NOTE: You can use the RD-AM8285-01 impedance converter as shown
in Figure 103. If you use this converter, set its switch
to 50W.
(c) Connect the CH1 input of the oscilloscope to the BNC tee adapter
T1 with a video cable (VC2).
NOTE: It is important to use the same oscilloscope to measure
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.
Page 120
Aug 20/2002
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.
VIDEO PATTERN
GENERATOR
PERSONAL
VMU TESTER
RS-232 NULLUUT
TEST HARNESS
RD-AM9341
SPECTRUM
ANALYZER
RF OUTPUT
20dB RF
VMU TUNER
VIDEO
MONITOR
OSCILLOSCOPE
ATTENUATOR
(50 )
RF1
J1
J1
COMPUTER (PC)
COM1
RF2
RF3
RF4
VIDEO INPUT
J2
RS232C I/F
RF1
RF2
RF3
RF4
TO VMU
50-
TERMINATORS
VC2
50- INPUT
AC POWER IN
115 V, 400 Hz
VC1
RD-AX8308
RD-AX8308-01 *2
VIDEO OUT RF IN
TEST HARNESS
RD-AM9341-01 *1
BNC TEE
T1
BNC TEE
T2
W
W
(75 W ) W
ADD THIS HARNESS
BETWEEN VC1
AND T1 FOR 100-W
VIDEO INPUT
MONITOR
RFC1
RFC2
RFC3
CABLE
CH1 THRU CH12
MODEM CABLE
*1- THE RD-AM9341-01 TEST HARNESS IS NECESSARY IF THE UUT IS RD-AA5002-23 OR
RD-AA5002-25. REFER TO SHEET 2 FOR AN ALTERNATIVE INPUT CIRCUIT.
*2- 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.
VMU TEST SETUP
Figure 103 (Sheet 1)
Page 121
Feb 20/2002
Matsushita Avionics Systems Corporation
COMPONENT MAINTENANCE MANUAL
PART NUMBER RD-AA5002 SERIES
23-32-47
YOU CAN USE THE RD-AM9341-01 TEST HARNESS TO DO A TEST OF 100-W VIDEO INPUTS AS
SHOWN BELOW. THE RD-AM9341-01 TEST HARNESS CONNECTS A 100-W RESISTANCE IN
PARALLEL WITH THE VIDEO INPUT.
VIDEO PATTERN
GENERATOR
VC1
RD-AX8308
RD-AM9341-01
VMU TESTER
VIDEO INPUT
BNC TEE
T1 CH12 FOR RD-AA5002-23
CH7-12 FOR RD-AA5002-25
AS AN ALTERNATIVE, YOU CAN ALSO USE THE RD-AM8285 IMPEDANCE SELECTOR TO DO A
TEST OF 100-W VIDEO INPUTS AS SHOWN BELOW. THE RD-AM8285 IMPEDANCE SELECTOR
CONNECTS A 50-W RESISTANCE IN SERIES WITH THE VIDEO INPUT.
VIDEO PATTERN
GENERATOR
RD-AX8308
VMU TESTER
VIDEO INPUT
OUT
50
IMPEDANCE
CONVERTER
IN RD-AM8285
*3
AC POWER IN
115 V, 400 Hz
W
RD-AM8285-01
75W
IMPEDANCE
SELECTOR
IN OUT
VC1
VC1A
VC1B
BNC TEE
T1 CH1 THRU CH12
*3- THE RD-AM8285 IMPEDANCE CONVERTER IS NOT NECESSARY IF THE OUTPUT IMPEDANCE
OF THE VIDEO PATTERN GENERATOR IS 50 W.
VMU TEST SETUP
Figure 103 (Sheet 2)
Page 122
Aug 20/2002
Matsushita Avionics Systems Corporation
COMPONENT MAINTENANCE MANUAL
PART NUMBER RD-AA5002 SERIES
23-32-47
(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 tester's RS232C I/F connector (DB25F) to the PC's
COM1 connector (DB9M or DB25M) with an RS-232 null-modem cable.
(d) Printer
You can connect a printer to the PC's LPT1 connector if it is
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COMPONENT MAINTENANCE MANUAL Video Modulator Unit (VMU)(31)
