Fluke Biomedical 07-492 - Manual (Page 14)

Nuclear Associates 07-492
Operators Manual
3-4
If an oscilloscope is used to measure the voltage
divider, an independent voltmeter should be used
to measure scope sensitivity before each operation
check.
Data with a kVp test cassette would be useful. Note positioning error and film usage when applying the
cassette.
3. At installation, record all parameters of the measurement in a bound notebook. Also record
geometry, cable connections, tube I.D., generator I.D., divider and kVp meter oscilloscope
waveform pictures, oscilloscope and voltmeter I.D, and any other information that may prove useful
for periodic operation checks.
4. Periodically (every six months), or whenever a serious discrepancy in kVp operation is noted, the
above tests should be repeated to determine if the unit is operating properly. The kVp meter,
divider, cassette result, and x-ray settings should be examined for consistency.
3.7 Multiple X-Ray Machine Method
If a voltage divider is not available, use the following procedure to perform initial and periodic operation
checks of the kVp meter:
1. Choose several x-ray systems suited for the test. If possible, choose at least two different systems,
i.e. three phase vs. one phase, falling load vs. not, etc. Choosing dissimilar x-ray machines for the
check reduces the possibility of systematic errors.
2. Make comparative measurements of the x-ray systems using the kVp meter.
Data with a kVp test cassette would be useful. Note positioning error and film usage when applying the
cassette.
3. At installation, record all parameters of the measurement in a bound notebook. Also record
geometry, cable connections, tube I.D., generator I.D., kVp meter oscilloscope waveform pictures,
oscilloscope I.D, and any other information that may prove useful for later periodic operation
checks.
4. Periodically (every six months), or whenever a serious discrepancy in kVp operation is noted, the
above tests should be repeated to determine if the unit is operating properly. The kVp meter,
cassette result, and x-ray settings should be examined for consistency. If the kVp meter suddenly
produces different results from previous tests on a specific x-ray machine, then there is a strong
probability that the kVp meter is operating properly. However, if all of the x-ray measurements
suddenly change, then the kVp meter may be malfunctioning.
NOTE