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TM 11-6625-3145-14
Verification and Adjustment Procedures-318/338 Service
PARALLEL ANALYZER
4. ADJUST THRESHOLD VOLTAGES ON THE A02 INPUT-B BOARD
Equipment Required
1 Regulated DC Power Supply
1 Digital Multimeter (DMM)
1 Oscilloscope
NOTE
Before starting the following procedures, make sure that all probes are connected
properly.
EXT CLK Threshold Adjustment
Setup
1. Make sure that all four P6451 Parallel Data Probes are connected.
2. Connect the oscilloscope channel 1 probe tip to TP100 on the A01 INPUT-A board.
3. Set the oscilloscope triggering source to channel 1 and the sweep rate to 1 AS/div.
4. Set the EXT CLK Threshold to V1.
5. Set CLK to EXTT.
6. Select the Trigger menu and set the EVENTS field to 00000:WA OFF:WB OFF:WC. This will cause the 338 to
acquire data without triggering.
DC Balance
1. Ground the P6107 External Clock probe tip.
2. Set Threshold LEVEL V1 to 0.0 V.
3. Press the START key.
4. Turn EXT CLK DC BALANCE R284 on the A02 INPUT-B board to the counterclockwise end.
5. Turn R284 clockwise slowly while observing the oscilloscope waveform and mark the point where the
waveform moves from stationary-high level to stationary-low level.
6. Then turn R284 to the clockwise end.
7. Turn R284 counterclockwise slowly while observing the oscilloscope waveform and mark the point where the
waveform moves from stationary-low level to stationary-high level.
8. Adjust R284 to the center position between the points you marked in procedures (5) and (7).
9. Press the STOP key.
5-84
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Страница 521: ...TM 11 6625 3145 14 318 338 4434 926 338 Acquisition Module Wiring Diagram ...
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Страница 542: ...TM 11 6625 3145 14 Figure 9 8 318 338 A10 CRT Board Component Locations ...
Страница 544: ...TM 11 6625 3145 14 Figure 9 9 318 338 A11 Inverter Board component Locations ...
Страница 546: ...TM 11 6625 3145 14 Figure 9 10 318 338 A12 Regulator Board Component Locations ...
Страница 548: ...TN 11 6625 3145 14 Figure 9 11 318S1 338S1 A07 Serial RS232 Non Volatile Memory Board Component Locations ...
Страница 551: ...TM 11 6625 3145 14 Figure 9 12 338 A01 Input A Board Component Locations ...
Страница 553: ...TM 11 6625 3145 14 318 338 SERVICE ...
Страница 554: ......
Страница 555: ...PIN 058584 ...