Acceptance Tests (Kv, Time, Ma And Mas) - CPI CMP 200 Series Service Manual

CPI Canada Inc.
4.3.5 Dual Speed Starter Verification (Cont)
3. Select 100 kV, maximum mA, 50 ms, small
focus.
Press and hold the PREP button.
4. Measure the rotor boost time.
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.
6. After a high-speed prep, verify that the
dynamic brake is applied.
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
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.
Use and disclosure is subject to the restrictions on the title page of this CPI document.
®
CMP 200 X-Ray Generator Service Manual
Step
Action
Ch # 901476-06
Acceptance Testing
Action
A 180 Hz waveform dropping to
less than half amplitude after
prep complete.
Should agree with the value in
the dual speed starter table at
the end of chapter 2.
≥ 3300 RPM.
Low Speed
High Speed ≥ 9500 RPM.
Will hear the X-ray tube slow
down to 60 Hz.
Result
N/A
Rev. A
4
Result
Check
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