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Ampetronic FSM User Handbook Manual

Field strength meter
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Handbook Contents
Safety
•
Introduction
•
Overview of unit
•
Operation of unit
•
Signal cables
•
•
AFILS Test / Commissioning
•
Procedure
1.
2.
3.
4.
5.
6.
7.
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Test CD track listing
•
This symbol is used to alert the user to important
operating or maintenance instructions.
The Lightning bolt triangle is used to alert the user
to the risk of electric shock.
SAFETY
1.
It is important to read these instructions, and to follow them.
2.
Keep this instruction manual in an accessible place.
3.
Clean only with a dry cloth. Cleaning fluids may effect the equipment.
4.
Refer all servicing to qualified personnel. Servicing is required when the apparatus has been
damaged in any way, such as a power supply cord or plug is damaged, liquid has been spilled
or objects have fallen into the apparatus, the apparatus has been exposed to any rain or
moisture, does not operate normally or has been dropped.
5.
WARNING - To reduce the risk of fire or electric shock, do not expose this apparatus
to rain or moisture. The apparatus shall not be exposed to dripping or splashing and no
objects filled with liquids, such as vases, shall be placed on the apparatus.
Box Contents
1 x FSM
2 x Batteries
1 x Pouch
1 x CD of test signals
1 x 'User Handbook' inc AFILS Test /
1 x 'Designing Induction Loops
1 x Certificate of conformity
TO PREVENT ELECTRIC SHOCK DO NOT REMOVE THE
COVER. THERE ARE NO USER SERVICABLE PARTS
INSIDE. REFER SERVICING TO QUALIFIED PERSONNEL.
1
Commissioning Procedure
Handbook'

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Summary of Contents for Ampetronic FSM

  • Page 1: Table Of Contents

    Handbook Contents Box Contents 1 x FSM Safety • 2 x Batteries Introduction • 1 x Pouch Overview of unit • 1 x CD of test signals Operation of unit • 1 x ‘User Handbook’ inc AFILS Test / Signal cables •...
  • Page 2 INTRODUCTION The Field Strength Meter (FSM) has been designed as a high quality piece of test equipment incorporating true RMS detection for evaluating the performance of Audio Frequency Induction Loop Systems (AFILS) to the international standard IEC 60118-4. It is simple to use with all types of installation from simple counter loops through to low spill designs.
  • Page 3 OVERVIEW OF UNIT Power Volume Headphone control socket Power O / I Switch Frequency Band Meter mode scales in Overload Switch dB relative to 0.4A/m indication Field Background strength noise Pick-up coil >+8 >-12 Frequency Absolute level is response Meter not important, Meter Mode Scales - only relative...
  • Page 4 Method of use For most applications it is the vertical component of the magnetic field that is received by the hearing aid, as a result the FSM is designed to be used while held vertically as shown: Standing or seated depending on system use.
  • Page 5 Note: It is possible to test a system by connecting only one channel (left or right) of the CD to the equipment. This will not be a problem with the FSM test signals disk as both channels (Left and Right) are identical.

  • Page 6: Volume Of Use

    AFILS TEST AND COMISSIONING PROCEDURE This procedure is intended to be used in conjunction with an Ampetronic Certificate of Conformity for AFILS according to IEC60118-4 Volume of use (3 dimensions not sound level) PURPOSE - define and record the three dimensional useful magnetic field volume for the loop system and determine a series of reference measurement points.

  • Page 7: Background Noise

    • On the FSM: Select ‘Background noise’ mode. • Locate and note maximum reading levels / positions on the Certificate ensuring the FSM pick-up coil is orientated the same as the hearing aid telecoils (usually vertical). If a noisy zone is found a minimum of 30 sec should be taken to establish a maximum reading.

  • Page 8: Field Strength

    • Increase the input gain to achieve compression (6dB / 12dB LED on the loop driver front panel for Ampetronic amplifiers). • Select a typical listening position, and increase drive current until FSM reads approximately 0dB during the bursts of 1kHz sine wave. The reading is the maximum LED illuminated over 60 seconds.

  • Page 9: Frequency Response

    PURPOSE – check the frequency response is acceptable and adjust if necessary • On the FSM: Select ‘Frequency response’ mode. • Use pink noise (CD track 2) as an input to the loop system. • At each measurement position (A-F), measure the readings with the frequency filter set to 100Hz, 1kHz and 5kHz –...

  • Page 10: Field Strength

    PURPOSE – make a final check, and readjust the field strength if necessary. Not required if there has been no adjustment in step 4. • On the FSM: Select ‘Field strength’ mode. • Select Combination signal (CD track 1). • Re-test the system at one or more measurement points. Re-adjust if necessary to ensure the levels match the ‘final’...

  • Page 11: Overspill

    15dB from the white scale (Field strength mode) reading. o For more detailed analysis of spill and noise issues, the use of more comprehensive audio test kit may well be required such as an NTI Minilyzer and Ampetronic CMR3 probe.

  • Page 12: System Use

    • Ensure the programme signal activates the compression on the loop driver. If not, adjust input gain until compression is achieved. • Use the FSM in ‘Field strength’ mode to check the room for levels, and signal quality. Ensure the pick up coil is orientated the same as the hearing aid telecoil –...

  • Page 13: Troubleshooting

    No Headphone signal Check the FSM switched ON Check the headphones are plugged in, and the volume control is turned up. Check the >+8dB / >-12dB LED is not illuminated – the headphones are automatically disabled when this LED is illuminated to protect the user.

  • Page 14: Technical Specifications

    Background Noise -42dB to -12dB A-weighted reference All measurement modes are true RMS 125ms detection. The FSM is defined as a Class 2, Type 2 meter according to IEC60118-4 and IEC61672-1 (where relevant). Overall gain change <0.5dB OUTPUTS Headphone socket 3.5mm stereo jack connector.

  • Page 15: Accessories

    The FSM is calibrated during manufacturing test, and is valid until one year from the date the equipment leaves Ampetronic. Initial re-calibration is recommended one year from this date.

  • Page 16: Basic Commissioning Procedure

    COMBINATION (30 mins) Pink noise with 1s bursts of 1kHz Sine Track 2: PINK NOISE (30 mins) Bandlimited as per IEC60118-4 Track 3: 1kHz SINE (1 min) Contact information Website: www.ampetronic.com Technical: support@ampetronic.com Sales: sales@ampetronic.com Tel: +44 (0) 1636 610062 UP14301-7...

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