Fluke Biomedical 440RF - Manual (Page 10)

Victoreen 440RF/D
Operators Manual
2-2
Once the battery check has been successfully completed, rotate the function/range switch to the first
exposure rate range (100 mR/h) or dose equivalent range (1000 μSv/h). If the instrument has just been
turned on, there may be an upscale indication on this range, but it should decay rapidly. When the
indication on this range is, or has decayed to, less than one-third of full scale, switch to the 30 mR/h (or
300 μSv/h) range. Continue switching ranges until a steady indication greater than one-third full scale, or
until the 1 mR/h (10 μSv/h) range is attained. If the instrument has not been in use for some time, this
procedure may take a few minutes.
Figure 2-1. Exposure Rate Measuring System 440RF/D Battery Compartment
If the instrument is brought closer to a radiation source, or if radiation is intensified until the meter needle
pegs above full scale, the function/range switch can be rotated to less sensitive operating positions. To
enable accuracy, set the function/range switch so that the maximum on-scale indication is visible.
2.3 Instrument Positioning and Scanning
In general, after warm-up and range selection, the measuring system is placed is some specific location
and attitude to obtain a reading. Operator knowledge of radiation source locations, special geometry
applications, physical placement problems, etc., will affect exactly how and where the instrument is
positioned. Because the instrument’s low energy response is best when photons enter the case through
Series 9 V – 18 V Chamber
Voltage – Replace Both
Paralled 9 V for 9 V Electronics
Supply – Replace all Three