Portable loop tester with leaded hand held microphone
The Portable loop kit A covers up to 70 square metres. The built in AGC circuit maintains a clear and constant level of sound; this helps pre-vent the hearing aid from distorting.

Features
Constant Current Output - Compensating
automatically for changes in loop impedance.
Conforms to BS6083 pt4.
Auto compensates for field strength changes
Loop sizes from 1m2 to + 70m2
Single and twin turn loop
Twin microphone input or one microphone one auxiliary input

Automatic Gain Control (AGC)
To optimise sound quality the DLS70 induction loop amplifier has AGC. The AGC circuit increases the level of quite sounds and decreases extra loud sounds. This enables the output of the induction loop to maintain a clear and constant level of sound for the hearing aid user.

Loop drum
Loop drum for 70m2 system 35m of loop cable
Dimensions H:220mm Dia:80mm
Weight:

Specifications
Power supply 220-240Volt 50-60Hz
Frequency range 100-7000Hz +3dB
Maximum output current
(0.1 Ohm) 2ms > 30amp peak
5ms 20amp peak
continuous 5.3amp peak
Microphone input 1 with built in phantom power
Microphone input 2 with built in phantom power
Line input 30mV-10Volt
Tone control Bass 0 + 12dB
Tone controlTreble 0 + 9dB
Automatic Gain Control
(AGC) Working range > 70db
Attack time 2-20mS
Release time 0.5-10dB/s
Distortion < 1%
Aluminium case dimensions L:457mm W:330mm H:152mm
Weight: g

Dual function induction loop field strength meter
The FSM is designed to allow the accurate measurement of loop field strength within an area covered by an induction loop (AFILS) system. The FSM has many features which make it ideal for surveying, commissioning and periodically testing all induction loop installations. The LOW range setting is provided for measuring cross talk between loop systems and interference from mains equipment such as lighting, dimmers and computer equipment. An "A weight" filter is provided allowing measurements of the audio as the loop is heard by the human ear, this also rejects mains hum allowing accurate assessment of loop installations in areas of high electrical noise. All measurements are taken with 0dB defined as 100mAM-1 RMS using a 125mS PPM response rectifier in line with IEC118.

Using the FSM held vertically, walk through the area covered and note the average level of the loop field, adjusting the loop amplifier if necessary so that the average field strength is between -3dB and +3dB over 90% of the area. It is also wise to mark on a plan areas of poor coverage or high background noise so hearing aid users can be directed away from these areas.

Features
Low range: (-40dB) High
High range (+9dB) Ranges
Selectablerange: "A" Weight and Flat
Filter Conforms to IEC118
Belt Clip

Specification
Display Type: 10 LEDs
Battery: 9V PP3
Field sensitivity: 1mAM-1
Display Range: 30dB
Low Range: -40dB to -13dB
High Range -21dB to +6dB
0dB reference 100mAM -1

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