2.3. INSTRUMENT OPERATIONAL TEST
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The instrument then displays the battery voltage. Please see Figure below.
Figure 2.3: Battery Voltage Display
The instrument then displays the number of stored records if datalogging is enabled. Please
refer to the figure below.
Note:
The instrument may display "- - -" while it determines how many log records have
been saved. This should take no longer than a few seconds.
Figure 2.4: Startup Display Showing 189 Stored Data Records
The instrument will then move to normal operation, displaying the current rate (factory de-
fault: cpm). This boot-up process takes about 5 seconds.
Ensure that the low-battery indicator is not present. If the low-battery indicator is present,
replace the batteries as soon as possible. Should the instrument detect a battery voltage that
is high enough to power on, but too low to safely operate, the display will blank and the low-
battery icon will flash. Normal operation will not be available until the batteries have been
replaced. Under extreme low-battery conditions, be aware that the unit may not even turn
on or may turn itself off abruptly.
To assure proper operation of the instrument and detectors(s) between calibrations, an in-
strument operational check including battery test and instrument test should be performed
at least daily or prior to use, whichever is less frequent. A reference reading (or readings)
with a dedicated check source should be obtained with the detector(s) in a constant and re-
producible manner at the time of calibration or at the time the instrument is received in the
field.
December 2021
