DEXIS NOMAD Pro 2 - Calibration Checks

4140
NOMAD
7.2 Calibration Checks
The 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 NOMAD 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 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 Piranha
model 255 X-ray meter from RTI Group or 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
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 60601-2-65, 203.6.3.1.101.
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 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 manufacturer.
Test
Description
Acceptance
Limits
Timer Settings and Corresponding Acceptable Ranges
20 ms 40 ms 400 ms 600 ms 1000 ms
kVp (eff) Accuracy 60kV ±10% 54 to 66 54 to 66 54 to 66 54 to 66 54 to 66
Timer Accuracy
Setpoint
±10%, +1ms
17 to 23 35 to 45
359 to
441
539 to
661
899 to
1101
A duty cycle of 1:60 is required after each X-ray discharge to prevent over-heating
damage to the X-ray tube.