HP 212A - Page 29

The best position for a particular instrument is
the one which gives least jitter. If plate to plate
coupling is used, C 103 must be approximately
50 wp,£d.
If plate to cathode coupling is used,
C PO3 must be 30 pCLfd.
Replace CR102.
Check maximum pulse delay.
Replace CR103.
Replace V16. Check trailing edge of output
pulse and PULSE LENGTH calibration.
Replace V8. Check trailing edge of output
pulse.
Replace V108, Check PULSE LENGTH
calrbr ation.
Replace V109.
Replace V 107.
Replace V6. Check rise time and PULSE
LENGTH calibration.
Replace V16.
Check trailing edge of output
pulse and PULSE LENGTH calibration.
16. NO LENGTH CONTROL,
PULSE ROLLS OFF AT
10.5 TO 11 hsecs.
e
17, DRIFT OF PULSE
LENGTH FOLLOWING
CHANGE IN PULSE
RATE
CR 102
CR103
Vlb
V8
V 108
V 109
V 107
V6
Vlb
Vl08
V 109
V8
V107
Replace V108. Check PULSE LENGTH
calibration.
Replace V109.
Replace V8.
Check trailing edge of output
pulse.
Replace V107. Check PULSE LENGTH
calibration,
CRlO6
GR105
Only as last resort replace this crystal as it
may require calibration of a new PULSE
LENGTH dial.
Replace CR105,