Fluke Biomedical 10100AT - Manual (Page 11)

General Information
Specifications
1
1-5
Measurement Modes
Dosimeter Operation Only: In use when the Model 35080/80A/80B kVp Divider is not connected or
turned on.
Full-sensitivity Exposure: Automatic drift and offset compensation, and automatic post-exposure
display hold are performed in this mode. Measurement range covers a span from low-level image
intensifier inputs to unattenuated direct beams. Autoranging over five decades. Display updates at the
end of each exposure. When the Automatic Reset option is enabled, exposure start and end detection
are based on the exposure rate level crossing a 0.25 pA threshold. When the Automatic Reset option is
disabled, exposure start detection is based on the exposure rate level crossing a 0.25 pA threshold but
the exposure measurement is only reset by pressing the Reset/Measure key.
Full-sensitivity Exposure Rate: Automatic offset compensation and nonlinear digital filtering are
performed in this mode. Autoranging provides five decades of sensitivity ranges. The measurement
range covers a span from low-level image intensifier inputs to unattenuated direct beams. Display
updates once per second. Differentiation between exposure on and off condition based on 0.25 pA
threshold.
Very Low Dose Rate (VLDR): This mode is only for making very low dose rate measurements. Nonlinear
digital filtering and autoranging provide five decades of sensitivity ranges. Display updates once per
second. In this mode, automatic current offset and drift compensation is disabled. As a result, the system
leakage (includes dosimeter, cable and ion chamber) is displayed and must be compensated for. This
option should only be used with ion chambers suitable for very low dose rate measurements.
Dosimeter with kVp and Time Readout Operation: In use when the Model 35080/80A/80B kVp Divider
is connected and a filter pack is selected from the Model 35050AT Dosimeter's front panel.
Tri-measurement Exposure: A single shot, direct beam measurement of exposure, kVp, and time.
Autoranging across three-decade ranges and auto reset between exposures. Display updates following
each exposure. Exposure start and stop based on detection of voltage from the Model 35080/80A/80B
kVp Divider in excess of minimum kV for selected pack. A measurement delay of up to 999 ms may be
used to skip over unwanted portions of an exposure. To prevent measurement of spurious signals, the
35050AT Dosimeter can be set to ignore exposures of less than 5ms.
Dual-measurement Exposure Rate: A simultaneous measurement of kVp and exposure rate. The
display updates once per second. Autoranging across three-decade ranges provide adequate sensitivity
for direct beam measurements. Display updates approximately once each second.
Customization
A customization program, contained on a compact disk, is included as part of a Model 10100AT TRIAD
Field Service Kit.
The customization program runs on any IBM-PC or compatible computer. A cable and adapters are also
furnished with the kit and provide means of interconnecting the computer's and the Model 35050AT
Dosimeter's serial communications ports.
The program allows the user to modify the contents of the Model 35050AT Dosimeter's non-volatile
memory, and thus determine a number of important operating parameters for the Model 35050AT
Dosimeter. These are listed below:
1. All electrical calibration factors
2. All unit, ion chamber, and kV filter pack descriptions and conversion factors
3. Temperature and pressure unit types for use with air density corrections:
In degrees Fahrenheit, Celsius and Kelvin
In inches of Hg, mm of Hg, milliBars, hectoPascal, feet relative to sea level, and meters relative to
sea level