TM 11-6625-3145-14
Verification and Adjustment Procedures-318/338 Service
TEST 5 - EXTERNAL TRIGGER INPUT
Equipment Required
1 BNC to Mini-Jack Cable, 175-1178-00
1 Oscilloscope
1 Pulse Generator
1 10X Probe
1 BNC-to-Probe Adapter
1 50 ohm Terminator
1.
Connect a 50 ohm terminator to the pulse generator OUTPUT.
2.
Connect a 10 OX probe from the oscilloscope CH1 to the 50 12 terminator at the pulse generator OUTPUT using a
BNC-to-probe Adapter.
3.
Setup the oscilloscope as follows:
TRIGGERING
AUTO, AC, INT, CH1
TIME/DIV
5 ns (Use 10OX Magnifier if necessary)
CH1 VOLTS/DIV
1.0 V DC
CH1 POSITION
0 V (GND) set to the middle of screen
4.
Set the pulse generator as follows:
BACK TERM
OUT
OUTPUT
NORM
PERIOD
.1
µ
S
HIGH LEVEL
+2.80 V
LOW LEVEL
0.00 V
DURATION
20 nS @ +-1.4 V level
5.
Remove the 10X Probe and BNC-to-probe adapter from the pulse generator.
6.
Connect a BNC-to Mini-jack Cable from the 50 ohm terminator at the pulse generator’s OUTPUT to the TRIG INPUT
mini-jack on the right-side panel. Connect the cable braid lead to the GND mini-jack, also on the right-side panel.
7.
Power-up and setup the as follows:
TRIGGER MENU
SOURCE EXT
TRIG
EXT TRIG POL=
↑
8.
Press the START key and check that the 338 triggers.
9.
Set pulse generator PERIOD to EXT TRIG and ensure no cables are connected to the pulse generator External
Trigger Input.
10.
Press the START key and then press the pulse generator’s MAN TRIG.
11.
Check that the 338 triggers only after the PG502 MAN TRIG button is pushed.
12.
Set EXT TRIG POL to negative and the pulse generator’s OUTPUT to COMPLEMENT.
13.
Repeat steps (10) and (11).
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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 536: ...TM 11 6625 3145 14 ...
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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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Page 555: ...PIN 058584 ...