TM 11-6625-3145-14
Verification and Adjustment Procedures-318/338 Service
CHECK 4.
THRESHOLD VOLTAGE
1.
Connect all the data and ground leads of the P6451 Parallel Data probes (Pods A through D) together and connect
them to the instrument ground.
2.
Press the THRESHOLD menu key (normal operating mode).
Threshold Level TTL
a.
Set INPUT Thresholds to TTL for Pods A through D.
b.
Press the START key. The trigger position (indicated by T) will be displayed on the screen. The trigger position
will be <T= 7W>, <T = 127W>, or <T = 247W> depending on the trigger position setting in the Trigger menu
(begin, center, or end).
c.
Check that all data acquired are O’s.
Threshold Level V1
a.
Set Threshold LEVEL V1 to +0.3 V.
b.
Set Pods A through D equal to V1.
c.
Press the START key. The trigger position displayed on the screen will be <T=7W>, <T=127W>, or <T=247W>
depending on the trigger position setting in the Trigger menu.
d.
Check that all data acquired are O’s.
e.
Set Threshold LEVEL V1 to -0.3 V.
f.
Press the START key. The trigger position displayed on the screen will be <T=7W>, <T=127W>, or <T=247W>
depending on the trigger position setting in the Trigger menu.
g.
Check that all data acquired are l’s.
Threshold Level V2
a.
Set Threshold LEVEL V2 to +0.3 V.
b.
Set Pods A through D equal to V2.
c.
Press the START key. The trigger position is displayed on the screen will be <T=7W>, <T=127W>, or <T=247W>
depending on the trigger position setting in the Trigger menu.
d.
Check that all data acquired are O’s.
e.
Set Threshold LEVEL V2 to -0.3 V.
f.
Press the START key. The Trigger position displayed on the screen will be <T=7W>, <T= 127W>, or <T=247W>
depending on the trigger position setting in the Trigger menu.
g.
Check that all data acquired are 1’s.
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Summary of Contents for 318
Page 119: ...318 VERIFICATION AND ADJUSTMENT PROCEDURES ...
Page 182: ...338 VERIFICATION AND ADJUSTMENT PROCEDURES ...
Page 253: ...318 ___________________ TROUBLESHOOTING TREES ...
Page 344: ...338 TROUBLESHOOTING TREES ...
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Page 518: ...TM 11 6625 3145 14 318 338 4434 924 338 Block Diagram ...
Page 519: ...TM 11 6625 3145 14 318 338 4434 925 318 Acquisition Module Wiring Diagram ...
Page 520: ...TM 11 6625 3145 14 318 338 4434 926 318 338 Mainframe Wiring Diagram ...
Page 521: ...TM 11 6625 3145 14 318 338 4434 926 338 Acquisition Module Wiring Diagram ...
Page 522: ...TM 11 6625 3145 14 318 338 4434 928 Figure 9 1 318 A01 Input A Board Component Locations ...
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Page 528: ...TM 11 6625 3145 14 Figure 9 3 318 338 A03 ACQ Control Board Component Locations ...
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Page 542: ...TM 11 6625 3145 14 Figure 9 8 318 338 A10 CRT Board Component Locations ...
Page 544: ...TM 11 6625 3145 14 Figure 9 9 318 338 A11 Inverter Board component Locations ...
Page 546: ...TM 11 6625 3145 14 Figure 9 10 318 338 A12 Regulator Board Component Locations ...
Page 551: ...TM 11 6625 3145 14 Figure 9 12 338 A01 Input A Board Component Locations ...
Page 553: ...TM 11 6625 3145 14 318 338 SERVICE ...
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