GE Brivo OEC 715, Service Manual

Page: 222 / 551

Calibration
4-11
5. mA accuracy in Radiography Mode:
Measure the voltage of TP7 (MA-SMP) on MCB board with oscilloscope:
mA measured=Sample Voltage (TP7) (unitV)*1000/200ohm
mA real=mA accuracy measure
mA accuracy=[(mA set – mA actual )/mA set]*100%
Set the exposure mode and parameter to check to the voltage (TP7) values. The voltage of TP7 should be
in the range of the form below. Otherwise, mA calibration procedures should be performed until all the
voltage values meet the requirement in the list.
For power input: 100V/110V/120V (
Setting in Exposure Management )
Exposure mode KV and mAs value setting mA value Voltage (TP7)
minimum (V)
Voltage (TP7)
maximum (V)
Radiography 40KVp@40mAs 10mA -2.20 -1.80
110KVp@40mAs 10mA -2.20 -1.80
For power input: 200V/220V/230V/240V (
Setting in Exposure Management
)
Exposure mode KV and mAs value setting mA value Voltage (TP7)
minimum (V)
Voltage (TP7)
maximum (V)
Radiography 40KVp@80mAs 20mA -4.40 -3.60
110KVp@40mAs 20mA -4.40 -3.60