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35040
Operators Manual
3-8
and bias voltages, automatic leakage
compensation settings, and timer settings.
• When the Test Function screen is displayed, pressing the TEST FUNCTION button displays a
cursor that allows modification of the following settings:
- Enabling or disabling automatic leakage compensation or setting of the start and stop exposure
current thresholds
- Selecting the timer interval, count mode, and decimal places
- Specifying the effective exposure time presentation
Detector Select
The DETECTOR SELECT button displays the Detector Select screen.
Air Density
The AIR DENSITY button displays the Air Density screen. Subsequent presses advance the cursor
through the temperature, pressure, and air density correction on/off fields.
Units Select
The UNITS SELECT button displays the Units Select screen for selecting the rate divisor.
Bias Select
The BIAS SELECT button displays the Bias Select screen.
Reset/Measure
• When the Measurement screen is not displayed, pressing the RESET/MEASURE button displays
the Measurement screen and the Measurement display that was last viewed since power-up.
• When the Measurement screen is displayed:
- And when the instrument is performing exposure measurements, pressing the
RESET/MEASURE button toggles the timer
- Pressing and holding the RESET/MEASURE button for one second zeroes all exposure
measurements; the instrument also zeroes leakage measurements if leakage was being
measured
Up (S)
The function of the UP button depends on the screen displayed. It increases the temperature or pressure
setting. It toggles the state of the air density correction annunciator. For the Test Function and
Measurement screens, it displays the next information screen. It presents the next ion chamber for the
Detector Select screens. It increases the dose rate unit’s divisor. For setting the start and stop exposure
current thresholds, it increases the setting.
Down (T)
The function of the DOWN button depends on the screen displayed. It decreases the temperature or
pressure setting. It toggles the state of the air density correction annunciator. For the Test Function and
Measurement screens, it displays the previous screen. It presents the previous ion chamber for the
Detector Select screen. It decreases the dose rate unit’s divisor. For setting the start and stop exposure
current thresholds, it decreases the setting.
3.9.2 Powering Up the Model 35040 Therapy Dosimeter
Pressing the POWER button turns on the instrument. Initially, the instrument runs self-tests, restores the
ion chamber, temperature, pressure, air density correction status, exposure thresholds, and measurement
units to their previous values, and waits for the bias supply to stabilize.