Maintenance - Fluke 481 Operator's Manual

In addition to FREEZE, the other message that can appear on the display is
LOW BAT. When the LOW BAT message appears, the batteries should be
changed within 1 hour.
The display will indicate HI for good chamber voltage bias condition.
The program in the Survey Meter ROM is proprietary to Fluke. The firmware
version appears in the digital part of the LCD display (prior to the "all elements
on" display) when the Survey Meter is turned on. The firmware program consists
of three main parts: operation, communication, and monitoring.
The operation portion of the firmware performs all of the control functions needed
to read and control the electrometer and range change amplifier, calculate
radiation rate, and display the calculated values on the LCD Display. In addition,
the measured data are smoothed and displayed in an exponential manner with
time that simulates the rise and fall time of an ordinary meter display. Range
changing is performed automatically. If a large increase in signal is detected, the
range changing skips to higher ranges bypassing exponential rise with time to
get to the new reading quickly. The Survey Meter continually integrates the
detected radiation signal and saves the accumulated amount that may be read
by the operator at any time. The operator may also reset the integration process.

Maintenance

Very little maintenance is required for the Survey Meter, but some periodic
attention may be necessary, especially if the Survey Meter is used in harsh
industrial conditions. The desiccant must be renewed and replaced periodically.
See the How to Contact Fluke section in this manual.
To prevent possible electrical shock, fire, or personal injury:
•
Batteries contain hazardous chemicals that can cause
burns or explode. If exposure to chemicals occurs, clean
with water and get medical aid.
•
Do not operate the Product with covers removed or the case
open. Hazardous voltage exposure is possible.
•
Use only specified replacement parts.
•
Have an approved technician repair the Product.
•
Use care when handling, the surface below the High Voltage
Board is conductive!
•
Many components on the printed circuit board are static
sensitive. Obey all ESD precautions when you touch the
printed circuit board assembly.
Install fresh batteries prior to performing any calibration on the
Survey Meter.
 Warning
Note
Ion Chamber Survey Meter
Maintenance
15