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35040
Operators Manual
3-6
Use the predicted timed charge or dose
measurement to diagnose a problem at the onset of
a timed measurement for sources that deliver at a
constant exposure rate. If the predicted timed
measurement is drastically different from the
expected value, there is no reason to wait for the
complete timer interval to expire before
investigating the cause of the discrepancy.
To differentiate the predicted and non-predicted
timed measurements, the instrument alternates the
display of time with a “PREDICT” indicator on the
predicted timed
measurement lines.
3.7.4 Using Other Ion Chambers
You may make measurements using electrical units of coulombs and amperes and manually calculate the
radiological values from known ion chamber and air density factors. Or you may use the Customization
software to add the new ion chamber’s description and calibration factor to the list available for
DETECTOR SELECT. See Section 3.10 for details.
3.8 Battery Care
To maximize both the life and the performance from the rechargeable battery, deep discharge should be
avoided. The battery will maintain peak performance through out the life of the product if the following
practices are adopted.
1. Store the instrument connected to the AC line power source if possible. This will maintain the
batteries at their full charge level and insure that the instrument is ready to go anytime it is needed.
2. If the instrument cannot be connected to AC line power during storage, fully recharge the batteries
at the beginning of the storage interval and store the instrument at 25°C or less if possible. For
extended storage, fully recharge the batteries at least annually to compensate for their self-
discharge characteristics. Decrease the time between maintenance recharges by one-half for each
10°C increase in the storage temperature above the 25°C baseline.
3. If possible, begin charging the batteries as soon as the “LoBat” annunciator appears and avoid
setting the automatic power down interval to a value greater than 15 minutes so that the batteries
will not become fully discharged if the instrument is left unattended.
4. Charge the batteries immediately if the instrument is allowed to operate to the 5.4 V automatic
power down level. This will avoid self-discharge to levels below which an extended recovery period
may be required.
5. If the instrument is used primarily from battery power, provide an extended charging period (24
hours or longer) for every 5 to 10 fast charge cycles.
The instrument will not operate when the battery voltage is below the 5.4 V automatic cutoff level. If the
battery voltage level is allowed to drop below this level due to self-discharge, an extended charge period
on the order of hours may be required to bring the voltage up to the 5.4 V level. During this period, the
NOTE
NOTE