7.5 Optional Calibration Checks
The NOMAD Pro is factory calibrated and tested prior to release (see your Certificate of Conformance)
and there are no adjustment options. A self-diagnostics is completed each time the device is powered
up. However, the optional checks listed below may be performed by a qualified technician as desired.
Setup a calibrated Performance Meter (such as the Victoreen NERO, mAx model 8000) according to
manufacture’s specifications to detect and report the following: X-ray Tube Voltage [kV Effective Mode],
Radiation Time [ms Effective Mode], and Dose [mR Average Mode]. The filter card for the Test
Detector should be in the 50-100kVp position.
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; NOMAD Pro 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, using the NERO mAx 8000 X-ray
meter. 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.
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 are observed.
Enable the NOMAD Pro and, with the cone perpendicular to the Test Detector, make exposures into
the Test Detector and capture the resulting data.
Compare the result with the factory release parameters (indicated in the chart below). For results
outside these parameters, discontinue use and contact your dealer/distributor or Aribex.
Test
To Next Page
Loading...
