Fluke Biomedical TNT 12000 - Manual (Page 123)

TNT 12000WD kVp, Exposure, and Exposure Time Measurement
Dental Waveform Analysis
E
E-3
Dental Waveform Analysis
In the Dental mode, waveform analysis of exposure time and kV measurements is done
as follows:
Dental with Filament Preheat (Single Phase)
Exposure time in milliseconds is calculated between the first and the last zero crossings
of the kV waveform plus 4 ms (compensates for the waveform time that does not produce
x-rays) after the preheat. Exposure time in pulses is measured between the first and the
last zero crossings of the kV waveform after the preheat.
Average kVp is measured on the pulses in the central 80 % of the kV waveform after the
preheat. Maximum kV and PPV are measured for the complete waveform after the
preheat. Exposure is measured from the start of the exposure to the end of the exposure.
Dental without Filament Preheat (Single Phase)
Exposure time in milliseconds is calculated between the first and last zero crossings of
the kV waveform plus 4 ms (compensates for the waveform time that does not produce x-
rays). Exposure time in pulses is measured between the first and last zero crossings of the
kV waveform.
Average kVp is measured on the pulses in the last 75 % of the kV waveform, less the last
peak. Maximum kV and PPV are measured for the complete waveform. Exposure is
measured from the start of the exposure to the end of the exposure.
Three Phase
Exposure time in milliseconds is calculated between the 75 % points on the rising and
falling edges of the kV waveform.
Average kVp is measured on the peaks in the central 80 % of the kV waveform.
Maximum kV and PPV are measured for the complete waveform. Exposure is measured
from the start of the exposure to the end of the exposure.
HF (High Frequency)
Exposure time in milliseconds is calculated between the 90 % points on the rising and the
falling edges of the kV waveform.
Average kVp is measured on peaks in the central 80 % of the kV waveform. Maximum
kV and PPV are measured for the complete waveform. Exposure is measured from the
start of the exposure to the end of the exposure.