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GENERAL
ELECTRIC
MEDICAL
SYSTEMS
AMX-iL X-RAY UNIT
7-1576
SM A0654E
2-6
ο
|
PROBE:
2TB1-1
GND:
2TB1-3
UPPER
H:
20 ms/div
LOWER
H:
0.2 sec/div
V:
5.0-v/div x 10 (Probe)
TRIG:
INT, DC, +/- Set Point
ILLUSTRATION 4-2
Check High Voltage Transformer Primary and Battery Voltage Under Load:
The HV transformer primary voltages will vary depending upon the level of charge in the battery.
It is assumed that the battery is at 118 to 120 v (full charge with 30 minutes rest) at this time.
Make
several exposures as indicated for Illustration 4-3 and 4-4 to determine that the output of the x-ray unit
is correct.
Do not make more than one exposure per minute.
This is a function check to verify opera-
tion before proceeding further.
It is impractical to use an AC voltmeter to read HV transformer primary voltages because of the dif-
ferences in response of the various meters to the square wave voltages and because of poor damping
which results in needle oscillation during even a 2-1/2-second exposure.
Use a scope to observe these
voltages.
Verify the SON-A-LERT "Beep" and Flash of the X-RAY on Lamp during the exposure.
Record in
F3382, Test 6.
Connect a Digital Voltmeter (2 - 200 vdc) across 4A1-2(+) and 4A1-11(-) to measure battery voltage
under load.
Make an exposure at 80 kvp, 200 mas and note battery voltage drop between standby, stator load,
and x-ray load.
Voltage drop from standby to stator load should be from 1 to 1.5 volts and from standby to x-ray
load from 22 to 24 volts.
If voltage drop is in excess of 25 voits check tightness of primary terminal
and jumper lead connections to battery.
!f necessary, check each cell group voltage under x-ray load
to locate and correct cause of excessive voltage drop.
45
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