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35040
Operators Manual
B-2
Refer to the following sections for details on the timed measurements:
• Section B.3.2, Making Timed Exposure Measurements, presents an overview on configuring and
using the timer.
• Section B.4.1, Front Panel Controls: RESET/MEASURE, discusses how to start and stop the timer
as well as zero measurements.
• Section B.4.4, Timer Setup, provides details on the timer configuration.
• Section B.5, THEORY OF OPERATION, specifies how the instrument performs timed
measurements.
• Section B.7, CUSTOMIZATION, provides information on customizing the measurement displays
and timer intervals.
B.2.3 Specifications Update
This section lists the specification changes with respect to the Model 35040 Therapy Dosimeter
Instruction Manual.
Charge Measurements
Range, Resolution, and Repeatability:
Full Scale Range Display Resolution
Repeatability
(± counts)
200.00 pC 0.01 pC 5
2.0000 nC 0.0001 nC 1.5
20.000 nC 0.001 nC 2.5
200.00 nC 0.01 nC 1
2.0000 μC 0.0001 μC
1
20.000 μC 0.001 μC
1
200.00 μC 0.01 μC
1
2.0000 mC 0.0001 mC 1
20.000 mC 0.001 mC 1
Timed Charge Measurements
Range and Resolution: Same as charge measurements.
Measurement Method: The timed charge measurement is derived by monitoring the charge integrated
over a time interval that begins with the activation of the timer. The timer automatically stops when the
elapsed time is equal to the timer interval setting or the exposure is over. Interpolation is used to
determine the charge at an integral number of seconds.
Measurement Accuracy: Same as charge measurements assuming that the rate of charge delivery does
not dramatically change within the interpolation window interval. Refer to Section B.5 for calculation
details.
Current Measurements
Range, Resolution, and Noise:
Full Scale Range Display Resolution
Noise
(± counts)
200.0 pA 0.1 pA 2
2.000 nA 0.001 nA 2
20.00 nA 0.01 nA 1
200.0 nA 0.1 nA 1