Fluke-biomedical 451P User Manual download pdf (Page 15)

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 Survey Meter exceeds 5 R/h,

the 'R' in 'mR/h' or the 'Sv' in 'Sv/h' displayed will blink to notify the user that a

potential error in the integrated radiation value exists. The blinking will stop when

the integrated value is cleared. This, however, may also clear the log data RAM.

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 1 hour of operation remaining. These times are for two batteries

installed and from the first occurrences of these indications. If the Survey Meter

is turned off during a low battery condition, the batteries will recover somewhat,

but time of operation remaining will be less. The LCD low battery indicator is

disabled during communication mode. Be sure to use fresh batteries when

calibrating the Survey Meter.

 Warning

For safe operation and maintenance of the product, note the

chamber bias from the self-test. If chamber bias is LO, the

Product cannot measure high radiation rates accurately. The

Product requires service, contact Fluke.

Verify the chamber bias is low. Turn off the Survey Meter and replace with new

9 volt batteries. Turn on the Survey Meter. After the self-test, if blinking low

battery reoccurs, the bias is low.

Warm-up Time

The pressured ion chamber collection potential is 105 Vdc and is derived from

the 5 lithium cells. The warm-up time for a Survey Meter that has been off

12 hours or more is about 4 minutes for readings less than 20 °R/h in a 10 μR/h

or less background.

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Fluke-biomedical 451P User Manual Page 15