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481
Operators Manual
2
gpl01.bmp
Figure 1. Fluke 481 Ion Chamber Survey Meter
Features
The following sections describe the features of the Survey Meter.
Overrange Rate
If the instantaneous radiation rate measured by the Model 481 exceeds 50 R/h (0.5 Sv/h),
the 'R' in R/h or the 'Sv' in Sv/h displayed will blink to notify the user that the radiation
field exceeds the measuring capability of the instrument. Also, a potential error in the
integrated radiation value may exist due to this condition. The blinking will stop when
the integrated value is cleared.
Low Battery Indicator
There are about 6 hours of operation remaining when the LOW BATTERY indicator first
becomes visible. When the LOW BATTERY indicator blinks, there is less than one hour
of operation remaining. These times are for 2 batteries installed and from the first
occurrences of these indications. If the instrument is turned off during a low battery
condition, the batteries will recover somewhat, but time of operation remaining will be
less.
Audio Alarm
The audio alarm set points are set using the RS-232 COMM port connected to a computer
along with the associated software. The audio alarm set point is set in increments of 1 %
full scale. That is from 1 % to 100 % of full scale. The “A” command in the menu allows
access to the scale and percent set point. The alarm will sound when readings reach or
exceed the set point.
1.888.610.7664 sales@GlobalTestSupply.com
Fluke-Direct.com
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