TM 11-6625-3145-14
Operating Instructions-318/338 Service
THRSH Test. To enter this test, press 8 while in the Diagnostics menu. This test verifies that the sawtooth wave or
constant threshold level signal will be generated. Refer to the Diagnostics menu or to the trouble-shooting tree in
for details. Figure 3-17 illustrates the THRSH test.
operation: When you select ALL (default) and press START, the sawtooth wave will be generated. The threshold value
will then appear on the screen.
If SINGLE is selected, then DATA ENTRY field will appear on the screen as in Figure 3-17. Set the threshold value to be
observed and press START. The constant threshold level will be generated and nothing will appear on the screen. This is
not a verification test, so you should probe the signal with an oscilloscope to verify the threshold level. To exit this test,
press the STOP key, and then X.
External Clock Probe Compensation. This test verifies that the External Clock Probe is properly compensated and
provides a way to correct any misadjustment. Note: two nearly identical P6107 probes are supplied with the 318S1/338S1,
one is called the External Clock Probe (20 pf compensation), and the other is called the Serial Data Input Probe (40 pF
compensation). Make sure you are using the probe marked External Clock.
To enter this menu, press 9 while in the Diagnostics menu. This test calibrates the P6107 External Clock probe by means
of the built-in pattern generator on the right side panel. First, set up probe as in Figure 3-18; the signals to be used are
specified to CH6 and G (ground). Figure 3-19 illustrates the External Clock Probe compensation display.
Figure 3-17. Display for the threshold test (THRSH).
Figure 3-18. Setup of probe compensation.
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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 ...
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