TM 11-6625-3145-14
Verification and Adjustment Procedures-318/338 Service
A. Oscilloscope Setup
1. Install the modules into the 7904 oscilloscope main frame; 7A26 amplifier in the left vertical slot, 7B85 time base in
Horizontal slot A and 7B80 time base in Horizontal slot B.
2. Connect a 50
Ω
terminator to the pulse generator OUTPUT. Connect a BNC T-connector to the 50
Ω
terminator.
Connect the CH1 oscilloscope probe to one side of the BNC T-connector.
3. Connect the P6107 External Clock probe tip to the other side of the BNC T-connector.
4. Setup the oscilloscope as follows:
7904 Mainframe
Horizontal Mode B
7A26
Position
Rising edge at center screen
Channel 1
VOLTS/DIV
20 mv (200 mV with 10X probe)
Trigger Source
CH 1
Display Mode
ALT
Position
0 v at mid screen
Channel 2
VOLTS/DIV
50 mV (500 mV with 10X probe)
Position
0 v 2.4 divisions above midscreen (-1.4 V at midscreen)
7B85
Slope
+
Triggering
Mode Coupling Source
Auto AC INT
Magnification
1 X
Hold Off
at minimum
B Delay Mode
B Starts after DLY
Time/DIV
50 ns (5 ns with magnifiction)
Trace Sep
On, minimum
∆
Time
zero
7B80
slope
+
Triggering
Mode Coupling Source
Auto AC INT
Position
rising edge at center screen
Hold Off
at minimum
Time/Div
10 ns (1 ns with magnification)
5. Set the pulse generator as follows:
Termination
BACK TERM
(pull switch out)
Period
0.1
µ
s
Duration
10 ns (5 ns X 2)
High level
+0.35 V
Low level
- 0.35 V
6. Select the A timebase and place the rising edge of the channel 1 waveform on the center graticule on the
oscilloscope screen.
7. Select the B timebase.
8. Connect the oscilloscope channel 2 probe tip to TP108 on the A01 INPUT-A board.
9. Enter the Threshold menu and set EXT CLK to V3 (0.00V).
10. Select the TRIGGER Menu and set the events field to: 00000*WA OFF:WB OFF:WC. This will cause the 318 to
acquire data without triggering.
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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 ...
Page 517: ...TM 11 6625 3145 14 318 338 4434 923 318 Block Diagram ...
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 ...
Page 526: ...TM 11 6625 3145 14 ...
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 ...
Page 554: ......
Page 555: ...PIN 058584 ...