CPI Canada Inc.
Acceptance Testing
4
Use and disclosure is subject to the restrictions on the title page of this CPI document.
CMP 200
®
X-Ray Generator Service Manual Ch # 901476-06 Rev. A
Page 4-5
4.3.5
Dual Speed Starter Verification (Cont)
Step
Action
Result
3.
Select 100 kV, maximum mA, 50 ms, small
focus.
Press and hold the PREP button.
A 180 Hz waveform dropping to
less than half amplitude after
prep complete.
4.
Measure the rotor boost time.
Should agree with the value in
the dual speed starter table at
the end of chapter 2.
5.
Use a strobe or reed tachometer and verify
that the tube(s) reach operating speed at end
of boost. Use the techniques in steps 1 and 3
to select low and high-speed modes
respectively.
Low Speed
≥
3300 RPM.
High Speed
≥
9500 RPM.
6.
After a high-speed prep, verify that the
dynamic brake is applied.
Will hear the X-ray tube slow
down to 60 Hz.
4.4.0
ACCEPTANCE TESTS (kV, TIME, mA AND mAs)
Note:
A Dynalyzer is not recommended for mA measurements with this X-ray generator. Bandwidth
limitations of the Dynalyzer will result in inaccurate mA measurements at mA values less than
approximately 100 mA. mA measurements should be made with an mA / mAs meter connected
to the mA test jacks on the HT tank. Exposure times must be greater than 100 ms to ensure
accurate measurements.
Warning:
Take all appropriate precautions when connecting the mA / mAs meter to the HT tank.
Ensure mains power is switched off and all capacitors are discharged before connecting
the meter. Use the same precautions when disconnecting the meter. The mA shorting link
must be in place on the HT tank at all times except when an approved mA / mAs meter is
connected.
Note:
Test equipment tolerances must be allowed for in the measurements in the following sections.
Limits stated are the maximum allowed limits, including equipment tolerances and
measurement error.
Disregard “cable charge” spikes at the beginning of the ma waveform.
Step
Action
Result
Check
1.
Set up the kV measuring device to measure
kV as per the manufacturers instructions.
Connect the output of the kV measuring
device to channel 1 of the oscilloscope.
N/A
