Ziehm Imaging, Inc.
Vision Installation Manual
MAN 06-0015, Rev. A
Page 14
M a i n t e n a n c e R e p o r t : C h e c k Tu b e C u r r e n t
Check Tube
Current
1. Tube current must be checked in each of the three fluoroscopic modes:
(1) Extremities, (2) Head, Spinal Column, and Pelvis, and (3) Thorax.
Rejection Criteria:
•
At 0.2 to 1.2 mA, reject if mA readings in multimeter and control panel display are dif-
ferent by 15% or greater.
•
At 1.3 to 8.0 mA, reject if mA readings in multimeter and control panel display are dif-
ferent by 10% or greater.
Test
1. Turn off the
Z I E H M V I S I O N
and disconnect the power cord from the wall
power supply.
2. Remove the tube head cover.
3. Remove the mA bridge and insert a multimeter probe in place of the jumper.
4. Adjust the multimeter to the lowest scale that displays a full 40 mAs.
5. Connect the system power cord to the wall power supply and turn on the system.
6. Select the Extremities mode, and press the hand switch or foot switch.
7. Observe the mA value displayed on the multimeter and compare to the value
shown in the control panel display. If the difference between the values equals or
exceeds the rejection criteria, then the generator must be replaced.
8. Write the mA value displayed by the multimeter in the box below.
9. Repeat steps 5 through 8 for the other two fluoroscopic modes.
Check
Radiographic Tube
Current
Rejection Criteria:
•
The mA value must be within 10% of the fixed 20 mA radiography value.
Test
1. Turn off the
Z I E H M V I S I O N
and disconnect the power cord from the wall
power supply.
2. Remove the tube head cover.
3. Remove the mA bridge and insert a multimeter probe in place of the jumper.
4. Adjust the multimeter to the lowest scale that displays a full 40 mAs.
5. Connect the system power cord to the wall power supply and turn on the system.
6. Select 75 kVp and 3 seconds of exposure time.
7. Press the hand switch to release exposure.
Extremities
Chest
Pelvic
40 kV
110 kV
