Connevans AFILS User Instructions

Loop field strength meter

Table of Contents

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Connevans AFILS Loop Field Strength Meter

The Connevans 40IFSCE

Audio Frequency Induction Loop

field strength meter is a

calibrated precision

measurement device.

It is designed to meet the

requirements of BS7594.

Two different frequency response characteristics are provided: ʻNORMALʼ which

is a restricted response, similar to that of a hearing aid, and ʻFLATʼ which is a wide,

flat response, similar to that of an equalized induction loop receiver for wide-

band communication. Both filter characteristics meet the requirements of

BS7594.

The meter is calibrated in two ranges; +3dB to -24dB and -24 to -51dB with

respect to the field strength of 0.56A/m recommended by BS7594, allowing

background magnetic noise levels to be measured as well as AFILS signal

strengths. The measured audio signal may be monitored using headphones on

all range and filter combinations.

AFILS Field Strength Meter Instructions

User Instructions

Version 1.3

Table of Contents

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Page 1 The meter is calibrated in two ranges; +3dB to -24dB and -24 to -51dB with respect to the field strength of 0.56A/m recommended by BS7594, allowing background magnetic noise levels to be measured as well as AFILS signal strengths. The measured audio signal may be monitored using headphones on all range and filter combinations.
Page 2 Rechargeable batteries are not recommended for infrequently used equipment due AFILS in the UK is 0.1A/m rms. However, speech has a peak to mean ratio (or crest to self discharge, but they can be used in this equipment. Operating life will be factor) of 12 to 15dB so to maintain good speech intelligibility, a correctly set up shorter from a rechargeable battery than from an alkaline battery.
Page 3 The PPM meter allows the user to Observe the LED bargraph. The background noise level should be no more than -27dB verify in real time that an AFILS can provide sufficient field strength for good speech clarity.
Page 4 AFILS itself. If this is the case then the cause of such noise must be found and eliminated or minimised to an acceptable level no more than 27dB below the speech peaks.
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