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Page Title:
COMPARATOR-DECODER (A4) ALIGNMENT. |
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 T.O. 12P4-2APX-192
NAVAIR 16-35TS1843-1
TM 11-6625-1646-25
HORIZONTAL DISPLAY
"'A" DEL/D BY
7-5. COMPARATOR-DECODER (A4) ALIGNMENT.
"B"
7-6. Comparator-decoder (A4) alignment must be performed
DELAY-TIME MULTIPLIER
0.3
when a new A4 module is installed into the TS-1843A APX.
PLUG-IN UNIT MODE
ALT
Proceed as follows:
4. Place AN/APM-239A controls and switches in the following
NOTE
positions:
While performing the alignment procedure
POWER MODE
AC DC
the extender card for A4 must not be used
6 AMP POWER circuit
ON
and the TS843A APX side covers must be in
breaker
place.
METER SELECT
DC
1. Make test connections per figure 7-2.
DC CONTROL
Adjust for 28
2. Place AN UPM-98A switches and controls in the following
volts dc.
positions:
METER SELECT
AC
POWER (2 switches)
ON
AC CONTROL
Adjust for 115
CAL-CONTROL panel
500 PRF
volts ac.
METER SELECT
TEST CONDITION
VOLTS
XTAL MARK & SYNC panel
ALTITUDE DIGITIZER
OUT
PRF
Adjust for CAL-
5. Place C-6280(P) APX or C-6280A(P) APX controls and
CONTROL panel
switches in the following positions:
meter indica-
MASTER
STBY
tion of 400.
IDENT OUT MIC
OUT
SYNC SELECT
INT
M-1
ON
TRIGGER DELAY RANGE
1-11
M-2
ON
TRIGGER DELAY FINE
1
M-3 A
ON
SIF CODER panel
M-C
ON
CODE A through D
0
MODE 1
73
SUB PULSE SELECT
SP
MODE 3 A
7700
FUNCTION
N
RAD
MON
LEVEL
HI
6. Observe the first bracket pulse on oscilloscope. Vary AN
PULSE WIDTH
.45
UPM-98A XTAL MARK & SYNC panel TRIGGER DELAY and
AMPLITUDE
8
the oscilloscope DELAY TIME MULTIPLIER controls until
3. Set oscilloscope controls as follows:
waveform A (figure 7-3) is displayed at a convenient reference
TIME BASE A
point on oscilloscope.
TRIGGERING MODE
EXT.
7. Vary oscilloscope DELAY TIME MULTIPLIER control
TRIGGERING LEVEL
Fully clockwise
counting the number of time marks passing the oscilloscope
TIME CM
.1 usec
reference point. Align the 20th time mark 50 c point on the
TIME BASE B
oscilloscope reference point. Note that the DELAY TIME
TRIGGERING MODE
EXT.
MULTIPLIER control is positioned at approximately 1.3. This
TRIGGERING LEVEL
Fully clockwise
point is exactly 20.0 usec from the first bracket pulse. The
TIME CM OR DELAY
20 usec
second bracket pulse should be visible.
TIME
Figure 7-3. Bracket Spacing Alignment Waveforms
7-3
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