Calibration Checks - KaVo NOMAD PRO 2 Operator's Manual

7.2 Calibration Checks

The KaVo NOMAD PRO 2 is factory calibrated and tested prior to release (see your
Certificate of Conformance) and there are no adjustment options.
Prior to checking the PRO 2 calibration performance, please review the information
provided below.
The following is a detail of the testing equipment, used at the factory, to check
conformance of the KaVo NOMAD PRO 2. Using other test instruments may yield differing
results. Please contact Customer Care for additional testing guidelines.
Measurement Method: Final performance measurements are made using a NERO
mAx model 8000 X-ray meter from Victoreen. Tube current (mA) is sensed across a series
connected resistor with an accuracy of ±1% and measured using a digital multimeter, prior
to encapsulation; the KaVo NOMAD PRO 2 has no provision for external measurement
of beam current after final manufacture. Exposure time is measured during the entire
exposure, referenced to 75% rise/fall. Accelerating voltage (kV) is measured at both peak
(kVp) conditions and effective conditions (kVeff), which is the equivalent kV as if the kV
were constant through the whole exposure time. Linearity is calculated per IEC 60601-2-7,
50.102.2a.
Keep the Box: This X-ray unit may be dangerous to testing technician and any bystanders
unless safe test exposure factors, such as placing the test detector in a lead lined box or
the use of a protective lead apron and thyroid collar, are observed.
This X-ray unit may be dangerous to the testing technician and any bystanders unless safe
test exposure factors, such as placing the test detector in a lead lined box or using a
protective lead apron and thyroid collar, are observed.
Enable the KaVo NOMAD PRO 2 and, with the cone perpendicular to the test detector, make
exposures into the test detector and capture the resulting data.
Compare the results with the factory release parameters (indicated in the chart below). For
results outside these parameters, discontinue use and contact your dealer/distributor or
KaVo.
Test
Description
kVp (eff) Accuracy
Timer Accuracy
A duty cycle of 1:60 is required after each X-ray discharge to prevent over-heating
damage to the X-ray tube.
Timer Settings and Corresponding Acceptable Ranges
Acceptance
Limits
20 ms
60kV ±10% 54 to 66
Setpoint
17 to 23
±10%, +1ms
40 ms 400 ms
54 to 66 54 to 66
359 to
35 to 45
441
600 ms 1000 ms
54 to 66 54 to 66
539 to 899 to
661 1101
37