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16 CHAPTER 2. GETTING STARTED
Figure 2.5: Startup Display Showing 189 Stored Data Records
If the Sigma Audio option is selected, the unit will display a countdown from :08 to :01 (in
seconds) as the unit measures background radiation levels.
The instrument will then move to normal operation, displaying the current rate for the Pri-
mary units (factory default: mR/h). This boot-up process takes about 12 seconds plus an-
other 8 seconds if Sigma Audio is enabled.
2.4 Instrument Operational Test
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.
If at any time the instrument fails to read within 20% of the reference reading when using
the dedicated check source, it should be removed from service and sent to a calibration fa-
cility for recalibration and/or repair. If desired, multiple readings may be taken at different
distances and/or with different sources so that other scales are checked.
Example of a Check Source reading:
Check Source # Rate Units
Once this procedure has been completed, the instrument is ready for use.
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