Fluke Biomedical 10100AT - Manual (Page 14)

10100AT
Operators Manual
1-8
Customization Kit: (37594) includes software on CD and a 6 ft (2 m) RS-232 interface cable with adapters
for PC- and AT-type computers.
Instruction Manuals: Model 10100AT TRIAD Field Service Kit Operator's Instruction Manual (38651).
HVL Filter Set: (37668) set of nine aluminum filters for half-value layer measurements: one -- 2 mm, two -
- 1 mm, two -- 0.5 mm, three -- 0.1 mm, and one -- 0.2 mm.
Kit Carrying Case: (37500D) high-density polyethylene (HDPE) plastic absorbs impact to protect contents.
Molded parallel ribs for strength. Corrosion-resistant hardware and locks. Custom-cut, high-quality foam
interiors surround and protect standard kit equipment and accessories. The case is gasketed to exclude
dust and moisture.
Environment
Operating: 0° to 50°C; relative humidity 20% - 80% non-condensing
Storage: -25° to 65°C
Kit Dimensions, Weight
Approximately 46 cm long x 33 cm wide x 15 cm deep (18 in x 13 in x 6 in); approximately 6.4 kg (14 lb).
kVp Measurement Accuracy and Method
The Model 35050AT Dosimeter will typically add an uncertainty of ± 2 mV to the voltage produced by the
Model 35080/80A/80B kVp Divider for a well behaved (quiet and constant) voltage waveform. The
accuracy of the peak detection method will be dependent upon both the shape of the kV waveform, and
the amount of noise present in the signal produced by the kVp divider. Based on sampling the output of
the kVp divider at a rate of 5 kHz, the peak voltage is determined by examining a 50 ms wide segment of
these samples. In selecting the data segment to be analyzed, a delay of one-tenth of the total exposure
time is inserted. When a measurement delay is used, this occurs after the measurement delay time
elapses or with the first rising edge after the delay time elapses. Before peak detection occurs, the signal
is passed through a digital filter with 1 ms time constant. The digital filter is not used with the Mobile filter
pack
Exposure Time Measurement Accuracy and Method
When seconds are selected as exposure time units, the exposure time accuracy is ± 0.1% of reading ±
0.2 ms. The measurement method is based on a kV threshold crossing. The threshold is set at 75% of
the kVp, or the minimum kVp for the filter pack in use, whichever is greater. The maximum exposure time
is six seconds and the measurement resolution is 0.2 ms.
When pulses are selected as exposure time units, the exposure time accuracy is ± 1 pulse. The
measurement method is based on a kV threshold crossing; pulses are counted by detecting each
passage through a threshold on the rising and falling edges each pulse in the output waveform.
When a negative measurement delay is specified, the TRIAD TnT Dosimeter does not include the delay
time in the measured exposure time. A negative measurement delay should be used in cases when x-ray
generator filament preheat pulses or other waveform anomalies should be excluded from kV and
exposure time measurements.
When the measurement delay is positive, the TRIAD TnT Dosimeter includes the delay time in its
measured exposure time. A positive measurement delay should be used in cases when the kV waveform
contains leading edge overshoot or other waveform anomalies that should be excluded from kV
measurements but included in the exposure time measurement.
* Specifications subject to change without notice.