Contacta Loop-FSM Bedienungsanleitung

Model - LOOP - FSM

User Manual

Audio Frequency Induction Loop Field Strength Meter

CONTENTS

Meter Design goals 2

Meter Operation Basics 3

Background Noise Tests 4

Program RMS/Peak Levels 5

Evaluating Frequency Response 6

Headphone/Flat spectrum output 7

Line In Flat Response 8

Meter Specifications / Calibration 9

Thank you for choosing our Field Strength Meter. It has been designed

to ensure that Hearing Loop (Induction Loop) Systems be installed and certified

to the new IEC 60118-4 standard. When these standards are met the user expe-

rience will be of equal quality wherever they have the opportunity to use their T-

coils. Our design team interviewed many installers throughout the industry which

resulted in the following design goals:

1. Very accurate and easy to read

2. Simple/straightforward operation

3. Based on the IEC 60118-4 specification

4. Headphone output

5. Flat spectrum output

6. Built to last and be reliable

As you follow through this manual, we will review how the meter should be used

to certify that the requirements of the IEC specification have been met.

Again, Thank you

Contacta Design and Engineering Team

Meter Design Goals

Meter Specifications:

Measurement Range: -62dB to +9dB (0dB = 400mA/m)

True-RMS Crest Factor: <3

Resolution: <0.1dB resolution for levels

over –32dB

Displayed resolution: 0.1 dB

Detection Type: True RMS on all features

Sensor: Pickup Coil

Direction of Sensitivity: Length-wise of meter’s longer dimension

and Parallel to meter face (Position noted

on Product)

Calibration: Calibrated at 1,000 Hz (sine) to read 0

dB at 5.03 mG

Frequency Response: Flat ±1dB from 50 Hz to 10,000 Hz

A-Weighted: Class 2 meter specified in IEC 61672-1

Power Source: Single 9v Battery & External Power

Jack

Headphone Jack: Output A-Weighted or Flat selectable

Display: 16x2 LCD Character Display

Backlight: Variable brightness blue LED

Calibration and Warranty:

This meter has been calibrated with equipment that is traceable back to the National Bureau

of Standards. Under general use this meter should not require regular calibration, however if

you return the unit to Contacta, the calibration can be checked and supplied with a calibration

curve. Please call to get a service number and check the costs involved.

Contacta, Inc. 332 E. Lakewood Blvd #400, Holland, MI 49424 Phone: (616) 392-3400

Email: support@contactainc.com.

This meter is warranted to be free of component, design and manufacturing defects for a

period of one year. Contacta accepts no responsibility for system designs or installations

where this meter was used for test and calibration purposes. Please contact us if you have

any questions. Thank you.

Line In Flat Response Mode:

On the top of the unit is a new feature, audio dBV

level. The readings and the display help determine

what level of signal is Coming from the house feed.

Levels between -10dBV and +4dBV are considered

to be line level signals. Often a poor loop system

Sound comes from a very low level facility feed.

This input uses the last mode on the FSM and dis-

plays an accurate level which can then be demon-

strated to the facility. We prefer a level between -

10dBV and 0dBV.

To use this feature cycle through the various mode

until you see Line In Flat Response on the display.

Now connect up the XLR adapter which has an

XLR female on one end and an 1/8” TRS connector

on the other end. If you wish to make up your own

adapter use the following information.

1/8 in TRS connector XLR female connector

Tip --------------------------------------------- Pin 2

Ring ------------------------------------------ Pin 3

Sleeve ---------------------------------------- Pin 1

Meter Operation Basics

Turning the meter ON and Off

On - Press and hold button A until the screen lights

Off - Press and continue to hold button “A” until the Powering

Down process is finished and the screen goes dark

Selecting the meter mode

When you press Button “A” it first displays the current mode

and the next press advances to the next meter mode:

1. Background Noise Test with Max indication

2. Signal Strength “A weighted” RMS / Peak

3. Field Strength “Flat” RMS / Max

4. Third Octave Levels 100, 200, 500, 1K, 2.5K, 5KHz

“B” Button functions

 In modes 1 - 3 pressing the “B” button reset the

MAX or PEAK readings

 In mode 4 pressing the “B” button advances the

center frequency of the third octave filters

Sensor Location

Button “A” On/Off and Mode con-

trol

Button “B” Reset/Select and Fre-

quency advance

Use / Menu

Switch

Background Noise Level Test

After turning the meter on it comes up in the Background

Noise “A weighted” measurement mode. The display will indicate

the RMS reading on the first line and the MAX reading on the second

line. Pressing button “B” resets the MAX reading.

How to test for background noise:

When testing a new facility for background noise first turn on

all lights, fans, sound system and other electrical equipment which

is normally on when the facility is in use. Usually the loop system has

not been installed yet, however if you are certifying an installation

this test is done without the hearing loop system turned on.

Walk throughout the seating area where the loop system will

be used, holding the meter in a vertical position at the listening

plane height. The important reading will be the MAX reading, Howev-

er it is important to watch the RMS reading. If the MAX reading ex-

ceeds –32dBA (readings above –32dBA will have a lower negative

number ex. –30dBA means there is more background noise than

–35dBA), you will need to document the areas where those higher

noise levels are found.

IEC 60118-4 Notes and Requirements

The standard as revised in 2004 notes that any background

noise level lower than –47dBA will result in a excellent signal to

noise ratio, however levels below –32dBA are acceptable and do

meet the requirements of the standard. If the background noise lev-

el is above –32dBA, then the facility management should be notified

and the source of the interference found and repaired.

Method II - Pink noise signal Cont.

Record the RMS level readings for each of the frequencies`.

As in method I if the level does not vary by more than ±3dB the sys-

tem as installed will meet the IEC specification. This method was

requested by the field engineer so they could run the test with one

instrument without continually adjusting the frequency source. It

also makes it easy to conduct the test in more than one location.

Headphone / Full Spectrum Output

The headphone output jack serves two purposes: First it can

be used to monitor the loop program and gives you an “A Weighted”

output signal that can be listened to with standard 1/8” stereo head-

phones. To change the headphone volume slide the Use/Menu

switch to Menu and use the Mode button to advance to Headphone

Volume. Pressing the Select button advances to the volume adjust

screen where the top button raises the volume and the bottom but-

ton lowers it. Once adjusted sliding the switch back to Use will save

the setting.

A full (flat) spectrum output can be sent from this same con-

nector which could then feed a spectrum analyzer. This would show

the signal level at the various frequencies and help to both confirm

proper operation and asses the frequency and level of any interfer-

ences.

To switch from “A-Weighted” to Flat: With the meter turned

on slide the Use/Menu switch over to Menu. Press the Mode button

“A” once and you will advance to the Headphone Jack setup screen.

Then pressing the Select button “B” you can choose either A-

Weighted or Flat Spectrum.

Menu Adjustments

In the Menu mode, selected by the slide switch, the following items

can be adjusted: Backlight level, Headphone output type, Head-

phone volume, Display units (dB, mG, uT) and Power timeout (5 to

30, or none.

Measuring Frequency Response

Detailed below are two processes that can be used to con-

firm the system properly reproduces all of the required frequencies

equally in the bandwidth of 100 to 5KHz. A test signal generator

such as the Contacta Loop-TSG will be required to perform these

tests and both methods will yield very accurate results.

Method I - Sine wave signal

Send at a minimum the following sine wave signals through

the hearing loop system without adjusting any of the audio or loop

level controls: 100Hz, 250 Hz, 500 Hz, 1000 Hz, 2500 Hz, and 5000

Hz. Using the Flat Spectrum mode record the RMS level generated

by each of these. To meet the IEC specification the levels should not

vary by any more than ±3dB.

Method II - Pink noise signal

Send a pink noise signal into the hearing loop system and

select the Third Octave mode on the meter. It will initially start at a

1000Hz center frequency.

Pressing button “B” will cycle through the frequencies of

100Hz, 200Hz, 500Hz, 1000Hz, 2500Hz and 5000Hz.

IEC 60118-4 Notes and Requirements

The standard as revised notes that within the frequencies of

100Hz to 5000Hz the hearing loop system should equally reproduce

all signals. At a minimum the systems is to be tested at 100Hz, 1KHz

and 5KHz.

Program RMS/Peak Levels

The second mode is used to set up the hearing loop signal

level using an A-Weighted filter. It is very difficult to set the field

strength to an average of –12dBA as it will constantly vary based on

the program used to set up the system. We will use the PEAK read-

ing to confirm that both our design and equipment meet the IEC

specification. Pressing button “B” resets the PEAK reading.

How to test then adjust the loop system level:

Once the hearing loop system has been installed, play some

bandwidth limited (100Hz to 5KHz) pink noise or 1KHz sine (use the

driver manufacturers recommendation) though the loop system.

Walk throughout the audience area holding your meter vertically.

Note the readings and confirm that the A-RMS level does not vary by

more than ± 3dBA. This lets you know that the perceived signal level

in the hearing aids will be the same, no matter where the person is

sitting.

Next: using program audio similar to what is normally used in

the facility, adjust the audio program level to a level just above

“normal”. Now turn on the hearing loop system and adjust the drive

level until a –3dBA to 0dBA PEAK level is obtained in the center of

the loop. Reset the PEAK level and confirm this level averages 0

dBA across the audience listening plane.

IEC 60118-4 Notes and Requirements

The revised standard states that the signal level across the

loop area should not vary by more than ±3dB. Once that is confirmed

the signal level based on the facility’s normal program should peak

at 0 dB as referenced to a 400mA/m. This will confirm there is ade-

quate loop current to produce both the peak and average (Avg. is

-12dB or 100ma/m) signal levels that work well with T-coil equipped

hearing aids.

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