Fluke Biomedical 440RF - Manual (Page 5)

General Information
Product Description
1
1-1
Section 1
General Information
1.1 Product Description
The Model 440RF/D Low Energy RF Shielded Survey Meter (Figure 1-1) is designed to measure low
intensity gamma or x-ray radiation fields. In addition, it can be utilized as a beta detector. Response to
gamma energy over a range of 6 keV to 1.2 MeV is achievable in fields as low as 0.1 mR/h. Upper limit
measurable exposure rate is 100 mR/h.
The instrument is especially valuable when used for x-ray leakage detection, chiefly in the vicinity of
electronic equipment with large electromagnetic fields.
The Model 440RF/D is a portable RF shielded, radiation exposure rate measuring system. The
instrument is composed of a detector (or transducer) and electronics which provide amplification, meter
response and computer interface (when used with a communicator device).
The detector is a guarded, unsealed air ionization chamber. The small DC signal produced by the ion
chamber is monitored by a sealed, evacuated preamplifier and is processed using the latest CMOS
microprocessor and support chip technologies.
The processed signal is then passed through a transistor-pulsing circuit to produce a standard analog
meter readout.
Using the communicator option, data entry verification, test, or calibration can be performed. In addition,
the instrument can be adjusted to meet environmental factors.
Figure 1-1. Model 440RF/D Low Energy RF Shielded Survey Meter