audiophony BM-Control User manual

USER GUIDE
H11388 - Version 1 / 05-2022
Magnetic field meter
BM-Control
H11388
Appareil de mesure de boucle magnétique
Magnetic loop measuring device
BM-
MADE IN FRANCE
Distributed by HITMUSIC S.A.S
Zone Cahors Sud
46230 FONTANES - FRANCE
BM-
A
Norm
0dB
-20dB
0dB
-20dB
>+8
+5
+4
+3
+2
0
- 1
- 2
- 3
- 4
- 6
- 8
- 10
- 13
<- 15
> - 12
- 15
- 16
- 17
- 18
- 19
- 20
- 21
- 22
- 23
- 24
- 26
- 28
- 30
- 33
- 43
+1
For optimal use of the loop measuring device, hold your device vertically.
Pour une utilisation optimale du mesureur de boucle magnétique, tenez votre appareil verticalement.
OFF
ON
LowBat
ON
Magnetic loop measuring device
BM-
H11388
hold
upright
Stickers & Polycarbonate
OP-FSM
Supplier Ref.
Subject
Sample Ref.
HIMUSIC Ref.
HIMUSIC Name
Creation date
Version
Scale
1
2022-05
BM-Control
H11388
N/A
1/1
Mesureur de boucle magnétique
Emballage
Signalétique
Polycarbonate

BM-Control - Magnetic field strenght meter
Page 10
English
2 - Packaging content
3 - Advise and security
The eld measurer has been designed to ensure that magnetic loop systems are
installed and certied according to the new IEC 60118-4 standard. When these
standards are respected, the comfort of the user will be identical wherever he is using
his prosthesis equipped with the T position.
The BM-Control makes it possible to commission an installation and certify its conformity.
To do so, please follow the procedure for receiving the magnetic loops in the appendix.
You can then complete the certicate of compliance.
This ergonomic instrument has two calibrated measuring functions and two types of
lters for removing background noise and magnetic eld intensity. Using a headset, the
BM-Control allows you to listen to and control the installation of your magnetic loop.
• A BM-Control eld meter,
• 2 LR06 battery,
• The user guide
Use only LR06 type batteries.
Do not put the meter in contact with water. Inltration of water in the case can damage
the electrical components that compose it.
Do not keep the device outdoors.
Use only a dry cloth - never use cleaning agents or water.
1 - Role of the measurer

AUDIOPHONY PUBLIC ADDRESS
Page 11
English
Volume
H11388
Appareil de mesure de boucle magnétique
Magnetic loop measuring device
BM-
MADE IN FRANCE
Distributed by HITMUSIC S.A.S
Zone Cahors Sud
46230 FONTANES - FRANCE
BM-
A
Norm
0dB
-20dB
0dB
-20dB
>+8
+5
+4
+3
+2
0
- 1
- 2
- 3
- 4
- 6
- 8
- 10
- 13
<- 15
> - 12
- 15
- 16
- 17
- 18
- 19
- 20
- 21
- 22
- 23
- 24
- 26
- 28
- 30
- 33
- 43
+1
For optimal use of the loop measuring device, hold your device vertically.
Pour une utilisation optimale du mesureur de boucle magnétique, tenez votre appareil verticalement.
OFF
ON
LowBat
ON
Magnetic loop measuring device
BM-
H11388
hold
upright
Stickers & Polycarbonate
OP-FSM
Supplier Ref.
Subject
Sample Ref.
HIMUSIC Ref.
HIMUSIC Name
Creation date
Version
Scale
1
2022-05
BM-Control
H11388
N/A
1/1
Mesureur de boucle magnétique
Emballage
Signalétique
Polycarbonate
Battery-low indicator
On/O indicator
Color-coded display of the eld strength
On/O switch
Measurement range selection switch
Volume control for the headphones
Headphone jack
Filter selection switch
4 - Description

BM-Control - Magnetic field strenght meter
Page 12
English
(-20db) Measuring range for background noise
Increases the sensitivity of the device. Used to detect stray magnetic elds or
a magnetic pollution zone. We advise to carry out your measurements with a
maximum of devices in operation (neon, sound sources, screen, electrical rooms and
transformers, etc) to reproduce as well as possible a normal use of the equipped place
and to evaluate in real condition the zones likely to be polluted .
This feature also allows you to determine the crosstalk of loops to test their privacy.
Measurement range from -43 to -12 dB.
(0 dB) Measuring range for magnetic eld strength
Broadband measurement range to control the eld strength that the induction loop
emits.
Filter A
Evaluates the values measured on the basis of the listening curve of human ears.
Filter Norm
Evaluates all the values measured in the same way on the basis of their physical units.
5.1 Using the meter
Before starting any calibration, be sure to determine a reference point in the loop
(usually in the middle of the magnetic loop being placed). Then we advise you to
determine a minimum of 6 measurement points.
BM-Control incorporates a receiver
coil placed vertically in the unit, so
it is important to maintain the unit
upright throughout the operation.
Respect also the distance between
the ground and the meter, it will
depend on the application of the
loop. The meter should be held at
head height (where the future user's
hearing instrument will be).
For example, for standing use, hold
the meter at approximately 1m70. For
seated use, approximately 1m20.
5 - Measerement functions

AUDIOPHONY PUBLIC ADDRESS
Page 13
English
We advise you to note all your measurement statements on a document and return
it to the establishment manager (end customer). This statement will certify that the
installation complies with the restrictions of IEC-60118-4 (if measurements and settings
are good).
Audiophony Public Address has created a compliance report to gather all your
measurements, you can download the model on the BM-Control product page:
https://audiophony-pa.com/en/produit/bm-control/
5.2 Step-by-step instructions
For optimum adjustment of the magnetic induction loop, use signals at 100Hz, 500Hz,
1KHz, 2.5KHz, 5KHz and pink noise in order to make an accurate adjustment with the
maximum of possible measurements.
You can download these signals from the BM-Coontrol product page: https://
audiophony-pa.com/en/produit/bm-control/
Measurement Signal
required
Measurement range
and lter selection
switch
Point
d'alignement
Valeurs de
références
mesurées
Step 1 Basic setting Amplier o BM-Control
o
BM-Control
o None
All controls
turned as far to
the left as pos-
sible (amplier)
Step 2 Background
noise Amplier o -20dB A Several points
inside the loop
Maximum <-
30dB
Ideal <-43dB
Step 3 Magnetic eld
strength Signal 1 KHz 0dB Norm Loop power 0dB +/- 3dB at
1000Hz
Step 4 Magnetic eld
strength Signal 1 KHz 0dB Norm Adjust loop
power
0dB +/- 3dB at
1000Hz
Step 5
Magnetic
eld strength
(mesure again)
Signal 100Hz,
2,5KHz and
5KHz
0dB Norm 0dB +/- 3dB at
1000Hz
Step 6 Reproduction
quality
Current signal
e.g. micro-
phone
0dB Norm Line IN control
(amplier)
-3 to +3 dB in
the peaks
To obtain accurate measurements, always keep the BM-Control upright.

BM-Control - Magnetic field strenght meter
Page 14
English
6 - Specifications
Scale calibration
Operating mode -20dB -20dB = 0,043A/m
Operating mode 0dB 0dB = 0,4A/m
Type de measurement True RMS 125ms
Frequency response
Filter A/Flat
30Hz ~ 500Hz -3dB ~ -4dB
500Hz ~ 2500Hz +/-0,25dB
2500 ~ 10kHz +/3dB
Outputs
Display Color-coded LED dot display
Headphone 3,5mm stereo Jack
Power supply
Batteries 2 x LR6 - AA
Indicator lights LED
Service life 100h
Dimensions
Dimensions (L x H x P) 83 x 126 x 35 mm
Weight Approx 300g
5.3 Notes and requirements of Standard 60118-4
The standard states that the signal level in the loop area should not vary by more than ± 3dB. Once
conrmed, the signal level from the normal building program should peak at 0 dB as referenced
at 400mA/m. This conrms that there is adequate loop current to produce both maximum and
average signal levels (average is de-12dB or 100ma/m) for hearing instruments equipped with
the T position.

AUDIOPHONY PUBLIC ADDRESS
Page 15
English
Standard EN 60118-4 of March 2007
This standard defines 4 very precise parameters.
The following procedure is recommended:
•The peak magnetic field must reach 400mA/m (integration time 0.125ms).
•Frequency responses should not vary more than 3dB between 100Hz and 5000Hz.
•The signal-to-noise ratio must be 47 dB (A-weighting).
•The magnetic field must be uniform throughout the listening area.
The type-approval procedure
•
•
•
Recommendation
Thanks to the law of February 2005, establishments receiving the public (ERP) are gradually equip-
ping themselves with magnetic induction loops in order to facilitate listening for people with hearing
difficulties. To be effective these systems must be carefully calibrated to verify that the installation
has been made in compliance with standard EN60118-4. We recommend the delivery of a certifi-
cate of conformity to this standard, according to the model enclosed, signed by the installer.
To allow a good listening it is necessary to check all these conditions.
The respect of the magnetic field intensity guarantees that the sound intensity is sufficient, the
responses frequency control ensure that the entire sound spectrum is perceived in the same way
and the signal-to-noise ratio measures the impact of interference magnetic disturbances on intelligi-
bility. Despite the installation of adequate equipment, many factors can disturb these parameters:
the presence of metallic structures causes the magnetic field to drop, transformers or current at
50Hz in the proximity cause magnetic noises. The size and the form of the room can make it difficult
to meet the recommended values at all points.
Procedure for receiving
magnetic loops
Room managers must ensure that, when installing any magnetic induction loop, the installer delivers
this certificate of conformity. Even if the room manager does not have the competence to judge the
result of the measurements, this "installation report" should be able to be consulted at any time for a
possible control by a team of auditors.
About the room, determine the points where the measurements will be taken ( center, extremities,
points near metal structures or noise sources).
Measurements by the installer, after the adjustment of the installed equipment, of the various
parameters set by the standard.
Delivery of this document signed by the installer to the room manager.

BM-Control - Magnetic field strenght meter
Page 16
English
Certificate of conformity
to IEC 60118-4 standard
Definition of the listening area for the hearing impaired
Standard: 1m to 1.4m
Standard: 1m to 2m
Area of use
1
Sketch of the room and listening area (indicate scale and dimensions)
Customer: ...........................................Installer: .................................. Équipement : .................................
Location:.........................................Room: ..................................................Serial N°: .................................
Comments: ........................................................................................................................................................
.............................................................................................................................................................................
I declare that the installation
complies with the IEC 60118-4 standard
Installer's signature :Date : //
Indicate 4 to 6 points (A to F) inside the room to perform the measurements – centre, corners, sides, front back, etc.
search for listening areas
with background noise
Zones > -22dB
Zones > -32dB
Background noise
2
A B C D E F G H I J K
Measurement points
Height (in meters) =
Magnetic field intensity
after adjustment
3
Magnetic field measurement
after adjustments
5
7Testing with end users
100Hz
500Hz
1kHz
2.5kHz
5kHz
Frequency response
after adjustments
4
Existence of other
systems nearby
Yes
No
Interferences
6

La société AUDIOPHONY® apporte le plus grand soin à la fabrication de ses produits pour vous garantir la meilleure qualité. Des
modifications peuvent donc être effectuées sans notification préalable. C'est pourquoi les caractéristiques techniques et la configuration
physique des produits peuvent différer des spécifications et illustrations présentées dans ce manuel.
Pour bénéficier des dernières informations et mises à jour sur les produits AUDIOPHONY® connectez-vous sur www.audiophony-pa.com
AUDIOPHONY® est une marque déposée par HITMUSIC SAS - Parc d'activités Cahors Sud - En teste - 46230 FONTANES - FRANCE
Because AUDIOPHONY® takes the utmost care in its products to make sure you only get the best possible quality, our products are
subjects to modifications without prior notice. That is why technical specifications and the products physical configuration might differ from
the illustrations.
Make sure you get the latest news and updates about the AUDIOPHONY® products on www.audiophony-pa.com
AUDIOPHONY® is a trademark of HITMUSIC SAS - Parc d'activités Cahors sud - 46230 FONTANES - FRANCE
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