NOMEX
Operating Manual - Measurements with the NOMEX Multimeter
D909.131.00/02 en
53
7 Measurements with the NOMEX Multimeter
7.1
Preparing Measurements
RAD/FLU/DENT and MAM Applications
The measurement area of the NOMEX multimeter
must be located in the radiation beam of the X-ray
unit and the detector area must be
fully irradi-
ated
(refer to
CT or DENT-PAN Application
The measurement area with a width of 3 mm must
be
fully irradiated
(gray area in
). The
bar with a width of approx. 1 mm (
4
) indi-
cates the center of the measurement area.
NOTE
To obtain the most accurate kV measurement
results possible, the dose rate selected on the
X-ray unit should not be too small. The NOMEX
software does not require any special settings,
because the NOMEX multimeter automatically
selects the optimal dose rate measuring range.
NOTE
Rotation of the CT and DENT-PAN X-ray units
is not permitted. The X-ray tube must be posi-
tioned vertically above the NOMEX multimeter.
During irradiation, the tube voltage value in kV is
determined for an exposure time corresponding
to the maximum storage time. The maximum stor-
age time depends on the selected sampling rate,
e.g. maximum storage time of 3.2 s at a sampling
rate of 2 kHz.
Only the values stored in the log memory are
taken into account in the calculation of the kV
measured value.
Dose and time are measured continuously.
All readings are updated at 0.5 s intervals.
