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5. MAINTENANCE page 35
Model BM-286A
Connect the DVM between TP16(-) and TP17(+).
Connect the oscilloscope between TP16(ground) and TP15(input).
Place
137
Cs source as close to the center of the detector under test.
Refer to Drawing 20 (Appendix F.) for an example of a typical pulse profile.
Adjust the oscilloscope controls to provide a similar display.
Adjust R42 for 1.0 volts peak pulse amplitude.
Verify that TP17 is <14 volts.
Set oscilloscope: 2 volts VOLTS\DIV
Move oscilloscope probe to TP13. Adjust R5 for 4 volts peak pulse amplitude.
NOTE:
Pulses of all amplitudes will be observed on the scope. Refer to the typical pulse profile
on Drawing 20 (Appendix F.). However there should be a noticeable increase in the display
intensity for those pulses having amplitudes of 4.5 volts or less relative to those of greater
amplitudes. If this is not readily apparent, try adjusting the scope intensity control.