Preliminary Kvp, Timer, And Load Check; Timer Check And Adjustment - GE AMX-II Service Manual

GENERAL ELECTRIC MEDICAL SYSTEMS AMX-il X-RAY UNIT
8-3179 SM A0654E
SECTION 12. PRELIMINARY KVP, TIMER, AND LOAD CHECKS
Initial Conditions:
a. Circuit breaker and keyed switch OFF. =
b. Tube unit shielded and x-ray port blocked
(from Section 10).
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Hi i
c. H. V. Divider connected (from Section 10). il ply 1444
Instrumentation: | +
a. Connect scope to H. V. Divider, refer to I
Mustration 4-11-30. 그 上 A
Scope to be grounded through line cord
and scope ground connected to AMX-110 25282-P10
chassis. Use external trigger circuit per ,
iNustration 4-11-31. Or INT, DC, +. ILLUSTRATION 411-33
b. Digital voltmeter across battery voltage Timer: 80 KVP, 10 MAS
(from Section 11). У = 20 KV/DIV
H = 10 MS/DIV
_ Xray tub t itored by 0-150 DCMA TRIG = Ext. Trigger Circuit or Int, DC, T
é meter (from 'Section 11 or Y NOTE: Deep discharge pulses as shown above
" appear on scopes with faster writing rates.
12-1 Timer Check And Adjustment Older scopes wil! appear as in Ill. 4-11-34.
1. Turn circuit breaker and keyed switch ON. +
4,82. Select 80 KVP, 10 MAS. Make an exposure and +
record exposure duration from scope waveform - +
measure time interval at 75% of maximum KVP
(60 KVP for a selected 80 KVP). See Ill. 4-11-33. teto ed eo
4,43. Select 80 KVP, 100 MAS. Make another ex-
posure and note exposure duration on scope. | 3
See (If. 4-11-34. 3
4. Ifnecessary adjust 3A1R7 for exposure interval | | ? | | |
within +/-2% of .10 second at 10 mAs and 21514P1Q
1.0 seconds at 100 mAs.
a ILLUSTRATION 4-11-34
5. Select 80 kVp, 1 mAs. Make another exposure .
and only if necessary, adjust 3A1R9 for Timer: 80 KVP, 100 MAS
exposure interval of 10 MS. V = 20KV/DIV
H = 200 MS/DIV
A6. Turn keyed switch and circuit breaker OFF. TRIG = Ext. Trigger Circuit
411-29