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35040
Operators Manual
3-16
Figure 3-23. The Bias Select Screen With the Bias Set to a Positive Voltage
Figure 3-24. The Bias Select Screen With the Bias Turned Off
Figure 3-25. The Bias Select Screen With the Bias Set to a Negative Voltage
In the example of Figures 3-23 to 3-25, the maximum voltage setting is 300.0 V. Thus, 300.0 V is 100%
of 300.0 V and -150.0 V is -50% of 300.0 V.
Use the UP and DOWN buttons to scroll through the customized bias settings. When the bias setting is
selected, wait for the bias voltage to match the selection before pressing the RESET/MEASURE button.
The top line of the display will read “WAIT Bias Not Ready” until the measured voltage matches the
selection. If the RESET/MEASURE button is pressed while the bias voltage is changing, the bias may be
set to the wrong voltage. While the bias voltage is changing, a current is produced that may cause an
“Internal Reset Error”, see Section 3.9.12.
Changing the bias setting automatically zeroes all
measurement readings.
To prevent an electrical shock, the Model 35040
Therapy Dosimeter bias should always be set to 0
volts or the instrument turned off when connecting
or disconnecting an ion chamber or triaxial cable.
Set:
300.0 V 100%
Central Electrde Pos
IC Bias: 300.0 V CEP
ADC
Set:
0.0 V 0%
Bias Off
IC Bias: 0.0 V OFF
ADC
Set:
-150.0 V -50%
Central Electrde Neg
IC Bias:-150.0 V CEN
ADC
NOTE
WARNING