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35040
Operators Manual
3-20
Figure 3-32. Annunciator positions
Table 3-2 lists the indicators the instrument uses to signal that a measurement quantity has not been
compensated for leakage or is not available due to the specified condition.
Table 3-2. Measurement Indicators and Conditions
Indicator Measurement Condition
? (left of value) All Non-leakage
1
Automatic leakage compensation is enabled, but
the exposure started before a leakage
measurement was available.
-.--- Leakage
Automatic leakage compensation is enabled, but
the exposure started before a leakage
measurement was available.
INVALID Effective Time
The calculated effective time is longer than the
actual exposure. This condition occurs when a
large amount of charge is injected at the
beginning of the exposure.
NA Leakage
The leakage measurement is not available since
automatic leakage compensation is disabled.
OVER Non-leakage
1
The quantity or one of its dependents has
exceeded the maximum value. Refer to Table 3-
3 for more information.
1
All non-leakage measurements (e.g., charge, current, dose, rate, effective time, etc.)
Table 3-3 specifies the conditions that cause the Model 35040 Therapy Dosimeter to display an
overrange indicator (OVER) for a measurement quantity.
Table 3-3. Overrange Conditions
Condition Overranged Measurement
1
charge > 19.999 mC
• charge
• average current
• accumulated charge
• effective exposure time
accumulated charge > 1.0000 C
• accumulated charge
current > 1.000 μA • current
current > 1.200 μA • all non-leakage
time > 19,999.9 s
• effective exposure time
1
Includes radiological measurements derived from electrical measurements.
39.995 nC
59.891 s
659.8 pA
ADC LoBias Tmr ALC