Phoenix ILA-1000 User manual

™
ILA-1000 —INDUCTION LOOP AMPLIFIER
Instruction manual
ILA-1000
INDUCTION LOOP AMPLIFIER
Now with „MLC“ correction for frequency errors, COMPRESSOR, loop impedance monitoring
and SPEAKON output jack.
ENGLISH
Made in EU
For Systems
according to
EN 60118-4
IEC 118-4
Phoenix Professional Audio GmbH
Gewerbepark Markfeld 5
D-83043 Bad Aibling / Germany
Tel.: [phone]
Fax: [phone]
www.phoenix-pa.com
www.phoenix-pa.com/shop
© Copyright 2018 Phoenix Professional Audio GmbH
www.phoenix-pa.com / www.phoenix-pa.com /shop
Phoenix logo is registered with the DE Patent and Trademark Ofce (TM)
All trademarks are the property of their respective owners DOC-050720
Features:
• Digital automatic audio signal compressor
• Loop detector for automatic measurement and power matching to loop
impedance
• Equalization by 2-point LF/HF EQ
• „MLC“ control for frequency error correction
• All controls are recessed and provide protection against incorrect operation

The exclamation mark in a triangle is intended to alert the user to the presence of
important operating and maintenance instructions in this manual.
The symbol consisting of a lightning bolt with an arrowhead in a triangle is intended to
alert the user to the presence of non-isolated, dangerous voltages within the housing
that may be strong enough to give off an electric shock.
CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT REMOVE THE
COVER. USE QUALIFIED PERSONNEL FOR ALL MAINTENANCE WORK.
EXPLANATION OF GRAPHIC SYMBOLS
1. Read this manual carefully.
2. Keep this manual in a safe place.
3. Observe all warnings.
4. Follow all instructions.
5. WARNING: To reduce the risk of re or electric shock, do not expose this equipment to rain or moisture.
Do not use this device near water.
6. Clean only with a dry cloth.
7. Do not cover any ventilation openings.
8. Do not install near heat sources such as radiators, air vents, stoves or other equipment (including ampliers) that
radiate heat.
9. Do not override the safety function of the polarity reversal protection or earthing contact plug. A connector with polarity
reversal protection has two pins, one wider than the other (USA / Canada only). A safety plug has two pins and a ground
terminal. If the supplied plug does not t into your outlet, it will be outdated and must be replaced by an electrician.
10. Route the power cord so that nobody can step on it or get caught. This particularly applies to plugs, sockets and the
point where the cable exits the device.
11. Use only Phoenix Professional Audio GmbH products and specied accessories.
12. Have maintenance performed by qualied service personnel only. The device must always be serviced if it has been
damaged in any way, for example, if the power cord or plug is damaged, liquids have been spilled on the product, or objects
have fallen into the product, the product has been exposed to rain or moisture, is not working normally, or has been dropped.
© Copyright 2018, Phoenix Professional Audio GmbH, www.phoenix-pa.com
Phoenix logo is registered with the DE Patent and Trademark Ofce (TM)
All trademarks are the property of their respective owners
IMPORTANT SAFETY INSTRUCTIONS & SYMBOL DECLARATION
ILA-1000
Instruction manual
- 1 -
™

© Copyright 2018, Phoenix Professional Audio GmbH, www.phoenix-pa.com
Phoenix logo is registered with the DE Patent and Trademark Ofce (TM)
All trademarks are the property of their respective owners
GENERAL INFORMATION
Instruction manual
- 2 -
ILA-1000
™
The ILA-1000 Induction Loop Amplier for audio transmission is widely used to provide hearing aids with
inductive audio signals.
The ILA-1000 Phoenix Induction Loop Amplier was developed as a high-quality LOOP amplier for medium
induction loops.
The system is characterized by its easy installation and customer-oriented operation with optimal performance.
Induction loop ampliers are very often used in churches, theaters, outlets, libraries, press rooms, lecture
halls, courtrooms, bank counters, interpreter systems or DRIVE IN / DRIVE-THROUGHs so that hearing aid
wearers can hear much better in severe acoustic conditions (background noise, reverberation etc) without
disturbing noises.
System advantages:
Due to the inductive coupling of hearing aids, the useful signal (audio transmission) can be heard much better
without disturbing noises. By transmitting an audio signal through the induction loop, an acceptable signal-to-
noise ratio is achieved.
Useful Information:
A purely acoustic, direct sound transmission (between loudspeaker and hearing aid) due to reverberation and
background noises considerably worsens the perception of the useful signal by the hearing aid wearer.
Receiver ILA-E:
The ILA-E Induction Loop Receiver makes it easy to quickly and easily check or maintain a loop system.
The ILA-E loop receiver is used wherever an induction transmission is installed or particularly suitable for peo-
ple who need a high quality „wireless“ hearing aid without having to use a real hearing aid, such as in channel
interpreter systems.
Planning the loop design:
Not everywhere where it would be desirable acceptable or good conditions for the installation of the induction
loop can be found. Therefore, it is necessary in the planning phase to examine a proposed location in terms of
the following conditions:
- Magnetic interference of electrical systems, for example, heating systems in the oor or in the roof area and
electronic controls of lighting systems (especially in cinemas, theaters, etc.).
- Inuence of magnetically or electrically conductive materials in the building structure, especially where the loop is
to be laid.
- Presence of other induction loops in the neighborhood whose signals can interfere with those of the scheduled loops.

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Phoenix logo is registered with the DE Patent and Trademark Ofce (TM)
All trademarks are the property of their respective owners
Instruction manual
- 3 -
ILA-1000
™
Unfortunately, it is still common practice to equip 100 V power ampliers with the additional audio transformer.
Such systems are fundamentally wrong, since they have an unfavorable frequency behavior. Such a system
conguration increases the inductance with an increasing frequency, so that the high frequencies important
for speech intelligibility can no longer be radiated.
Induction loop ampliers do not have this disadvantage. Therefore, by using dynamic processors and special
amplier technology (constant current source), they are best suited for generating a constant eld strength.
Monitoring
All important functions of the ILA induction loop amplier are monitored.
This means that the ILA-1000 induction loop amplier monitors its internal power output stage, the functio-
nality of the connected induction loop with a pilot tone pulse. If a monitored function fails, the yellow LED on
the front of the induction loop amplier will not light up and the error contact „INFO LOOP OK“ [15VDC] will
be de-energized.
Compatibility according to EN 60118-4:
The ILA-1000 induction loop amplier has been designed to be compliant with the EN 60118-4 standard, so
that a loop construction according to a „LOOP SEGMENT“ system is made possible.
In a „LOOP SEGMENT“ system, two ILA-1000s always work together to form a magnetic eld. As a result, a
uniform eld strength of the magnetic eld is always achieved over the entire area.
The magnetic eld outside the intended range loses strength rather quickly and drops to zero. This is done by
coupling a phase shifter FS-1, which is connected between the two ILA-1000, which in turn generates a signal
phase difference of 90 degrees in the electrical ow through two adjacent induction loops.
Further notes on loop laying with the use of a phase shifter FS-1 are described in detail in the following chap-
ters.
GENERAL INFORMATION

Before putting the induction loop amplier ILA-1000 into operation, we ask you to carefully read the safety
instructions.
We ask you to perform the installation according to the following guidelines:
In a highly visible position, an INDUCTIVE COUPLING sign should be located near the entrance to the area
where an induction loop is installed.
1 - Always place the amplier on a at and stable surface.
2 - Choose a dry environment and do not put liquids on the amplier.
3 - Avoid the proximity of heat sources.
4 - Never open the case of the amplier without disconnecting the power plug from the socket.
5 - Only connect the device to 230 VAC mains voltage.
- Heat sink with a temperature-controlled fan control
- Short Circuit Protection - Overheat Protection - Open Circuit Protection - Overload Protection and
Overload Protection
- LED level display „compressor“
- LED level display „output level“
- LED display loop detector „ERROR“
- LED - display temperature „TEMP“
- LED display overload „OVERLOAD“
- LED display „System POWER-ON“
- SOFT START and MEASURING with ashing „POWER LED“
- Balanced microphone / line inputs
- INSERT PORT Input/Output
- Phoenix connections for LOOP line
- Phoenix connection for LOOP CONTROL
- Separate volume control for all inputs
- Recessed volume controls, LF/HF EQ controls and MLC front panel controls
- Compression LED display 3 to 33 dB
- Output level LED display -27 to 0 dB
- Switchable phantom power (DIP switch on the back)
- Connectable GAIN system (signal increase by + 15dB)
- 19“ brackets can be removed for table version
- Space-saving 1 U housing version
- Monitoring of the loop impedance in the range from 0.5 ohms to 3.0 ohms
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Phoenix logo is registered with the DE Patent and Trademark Ofce (TM)
All trademarks are the property of their respective owners
Instruction manual
- 4 -
ILA-1000
™
SAFETY INSTRUCTIONS
KEY FEATURES

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Phoenix logo is registered with the DE Patent and Trademark Ofce (TM)
All trademarks are the property of their respective owners
Instruction manual
- 5 -
ILA-1000
™
FRONT
1.- MIC.-1
This control determines the sensitivity of the „MIC-1“ input.
2.- MIC.-2/LINE
This control determines the sensitivity (volume) of the „MIC-2/LINE“ input.
3.- LINE
This control determines the sensitivity (volume) of the „LINE“ input.
4.- MASTER
This control adjusts the electrical current ow of the loop.
5.- MLC „METAL LOSS CORRECTION“
Regulator for correcting frequency response errors caused by metals near the induction loop.
Useful information:
Rotate the MLC control to get the best playback / transmission of the audio signal on the induction loop while
monitoring the audio signal via the headset with the ILA-E receiver. Repeat the measurement procedure for all
ILA-1000 induction loop ampliers or induction loops bound in the system
6.- LOW-EQ lter (+-12dB)
Separate LF control of the individual microphone or LINE inputs.
7.- HIGH-EQ lter (+-12dB)
HF-EQ control in the range (+/- 12 dB), HF control of the individual microphone or LINE inputs.
8.- COMPRESSOR
LED display (3 dB to 33 dB)
9.- OUTPUT LEVEL
Output level LED display (-27 dB to 0 dB).
IMPORTANT:
In the event of a system malfunction (ERROR LED burning), no output level is displayed!
1 2 3 4 5 6 7 8 9 10 11 12 13 14

10.- ERROR
Loop impedance fault indication (Impedance not in the range of 0.5 - 3.0 ohms).
IMPORTANT:
After eliminating the fault, always reset the loop amplier ILA-1000 by switching off the amplier with the
POWER button, wait 3 seconds and turn it on again with the POWER button.
The measuring cycle (PILOT TONE) is reactivated and the POWER LED ashes..
11.- TEMP
Error message display; the amplier temperature is too high (in this state the amplier is deactivated)
12.- POWER - Power indicator
State-1 LED ashes, system measurement is in progress and the turn-on delay is active.
State-2 LED is lit, the system is activated and loop impedance measurement is completed.
13.- OVERLOAD
Overload indicator, LED lights or ashes when overload is detected, the LIMITER is activated.
14.- ON/OFF - Power switch
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Phoenix logo is registered with the DE Patent and Trademark Ofce (TM)
All trademarks are the property of their respective owners
Instruction manual
- 6 -
ILA-1000
™
FRONT
1 2 3 4 5 6 7 8 9 10 11 12 13 14

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All trademarks are the property of their respective owners
Instruction manual
- 7 -
ILA-1000
™
REAR SIDE / CONNECTIONS
1.- LOOP CABLE
SPEAKON socket 2-pin, the loop cable should be connected to the terminals (+ pin) and (- pin).
2.- AMPLIFIER/LOOP CONTROL
Fault signaling output 15VDC. The contact remains potential-free, if the amplier and the induction loop are
working without interruption. The contact is supplied with 15VDC voltage as long as there is a system fault or
loop fault.
3.- DC OUTPUT (+15VDC/-15VDC)
Balanced output voltage +/- 15VDC, used to connect or power a phase shifter FS-1.
4.- INSERT
The INSERT socket is unbalanced. It is used to connect external signal processing equipment such as additional
EQ‘s or FS-1 phase shifter. If the plug is not plugged in or if no additional device is connected to INSERT, the
signal path is bridged.
5.- LINE OUTPUT [LINE-OUT]
Balanced audio signal output to JACK socket (0 dB maximum).
6.- MODE-SWITCH MIC.-LINE
This switch determines the sensitivity of the MIC.2/LINE input.
Switchable between microphone level and line level.
Attention:
Always set the correct input sensitivity, otherwise an excessive signal level is reached at the input despite the
automatic device (setting on MIC and input signal with LINE level) so that the amplier can not process the
signal properly and the signal is distorted at the loop output
1 2 3 4 5 6 7 8 9 10

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Phoenix logo is registered with the DE Patent and Trademark Ofce (TM)
All trademarks are the property of their respective owners
Instruction manual
- 8 -
ILA-1000
™
REAR SIDE / CONNECTIONS
1 2 3 4 5 6 7 8 9 10
7.- SWITCH/DIP Switch GAIN/PHANTOM
DIP-1 (ON) —the sensitivity of the input is increased by +15 dB;
DIP-1 (OFF) — default sensitivity of input is set;
DIP-2 (ON) — the MIC.-2 / LINE input is supplied with 15VDC phantom power for condenser microphones;
DIP-2 (OFF) —phantom power is disabled.
8.- MIC.2/LINE INPUT
The input is balanced (+2), (-3), (1-shielding) - see diagram.
The input sensitivity is set on the front panel with separate MIC.2/LINE control and via DIP-1 or
MODE-SWITCH.
MODE-SWITCH MIC.-LINE
This switch sets the sensitivity of the MIC.2/LINE input between microphone and line level.
DIP-1 (ON) —the sensitivity of the input is increased by +15 dB.
DIP-1 (OFF) —Default sensitivity of input is set.
ATTENTION
All XLR inputs have a switchable phantom power 15VDC, DIP-2 (ON position).
If unbalanced, dynamic microphones are connected to the audio inputs, a coupling capacitor must be inserted
or the phantom power switched off, DIP-2 (OFF position).
Unbalanced inputs: Strip the wire conductors by 6 mm and
connect them to the terminals as shown. The center pin
must be connected to the shielding pin as shown. Tighten
the screws.
1 GND
2 +IN
3 -IN
1 GND und wire bridge to 3
2 +IN
Balanced inputs: Strip the wire conductors by 6 mm
and connect them to the terminals as shown. Tighten
the screws.

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Instruction manual
- 9 -
ILA-1000
™
REAR SIDE / CONNECTIONS
1 2 3 4 5 6 7 8 9 10
9.- SWITCH/DIP Switch GAIN/PHANTOM
DIP-1 (ON) —the sensitivity of the input is increased by +15 dB;
DIP-1 (OFF) — default sensitivity of input is set;
DIP-2 (ON) — the MIC.-2 / LINE input is supplied with 15VDC phantom power for condenser microphones;
DIP-2 (OFF) —phantom power is disabled.
10.- MIC.1 INPUT
The input is balanced (+2), (-3), (1-shielding) - see diagram.
The input sensitivity is set on the front panel with separate MIC.2/LINE control and via DIP-1 or
MODE-SWITCH.
ATTENTION
All XLR inputs have a switchable phantom power 15VDC, DIP-2 (ON position).
If unbalanced, dynamic microphones are connected to the audio inputs, a coupling capacitor must be inserted
or the phantom power switched off, DIP-2 (OFF position).

© Copyright 2018, Phoenix Professional Audio GmbH, www.phoenix-pa.com
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All trademarks are the property of their respective owners
Instruction manual
- 10 -
ILA-1000
™
In order to also provide users of hearing aids with a perfect sound signal, so-called induction loops are laid. In
this case, the signal is transmitted by inductive means of a laid-in-space loop in a receiver coil located in the
hearing aid.
The induction loop must be laid in such a way that it encloses the intended area of use. The impedance of the
loop is approximately equal to the direct current resistance.
When laying the loop in concrete, PVC protective pipe should be used, UNDER NO CIRCUMSTANCES STEEL
TUBE. In the case of difcult structural conditions, a test loop must rst be designed and the supply checked.
NOTE:
Directly above the loop wires the reception is worst, because the eld lines run horizontally there.
CONSTRUCTION SIMPLE LOOP SYSTEM „Single Array System“
A simple induction loop system consists of a LOOP amplier ILA-1000 and one or more equal size induction
loops, see drawing.
Figure 1.1 shows single loop Figure 1.2 shows double loop
Wire cross-section Min. cable length Max. cable length
0.5 mm215 meters 90 meters
1.0 mm230 meters 130 meters
1.5 mm242 meters 160 meters
2.5 mm271 meters 180 meters
4.0 mm2115 meters 190 meters
TECHNICAL APPENDIX
ILA-1000 LOOP- AMP ILA-1000 LOOP- AMP

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Instruction manual
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ILA-1000
™
Please lead parallel lines close together.
A signicantly better result (constant eld strength) than with single loops is achieved by laying LOOP SEGMENT
loops. The individual segments must be the same size, the distances should be between 2 meters and 5 meters.
Application examples: rows of seats in the theater, church, schools, etc.
IMPORTANT:
Disadvantage of a LOOP SEGMENT loop without phase shifter:
Wherever two loop lines run parallel, the eld strength is equal to „0“! The area of the „0“ eld strength can be
between a few centimeters to one meter.
IMPORTANT:
Rooms and areas where an induction loop has been installed should be marked accordingly.
CONSTRUCTION SIMPLE LOOP SYSTEM „Single Array System“

The example shows an induction loop with limitation of the induction eld to the adjoining room. The additional
limiting loop is mainly used where a space division by e.g. plaster boards has been performed where two
independent variable loops are to be processed with different audio signals.
The length of the additional turn of the limiting loop should be in the ratio of about 1:11.
Details are referring to a square space!
IMPORTANT:
Rooms and areas where an induction loop has been installed should be marked accordingly.
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All trademarks are the property of their respective owners
Instruction manual
- 12 -
ILA-1000
™
LOOP SYSTEM WITH DELETION OF THE MAGNETIC FIELD

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Instruction manual
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ILA-1000
™
The best result (constant eld strength) is achieved by laying a „DOUBLE LOOP SEGMENT“ with phase shift.
Compatibility according to EN 60118-4.
Such double LOOP SEGMENT induction loops are recommended for large areas and with large induction eld
inuence by metallic objects (walls and oors) in the concrete.
Application examples: large churches, exhibition halls, railway stations, schools, gyms etc.
Since the laying of the double LOOP SEGMENT induction loop is associated with quite a lot of effort, this type
of induction loops is usually only possible in new buildings or with general renovation of buildings.
The advantage of the DOUBLE LOOP SEGMENT induction loop is the up to 4 times lower loss of the induction
eld (low power - large area).
For dual LOOP SEGMENT induction loops, the audio signal is connected to the rst ILA-1000 LOOP amplier.
This in turn supplies the rst loop in the system.
Due to the phase modulation, the audio signal is shifted by 90˚ phases and forwarded to the second ILA-1000.
The second ILA-1000 then has to supply the second parallel induction loop throughout the system.
All LOOP segments should be equal and should not exceed ranges of 2 to 5 meters.
Compatibility according to EN 60118-4
In a „LOOP SEGMENT“ system, two ILA-1000s are always working together to form a magnetic eld.
As a result, a uniform eld strength of the magnetic eld is always achieved over the entire surface.
The magnetic eld outside the intended range loses strength rather quickly and drops to zero. This is done by
coupling a phase shifter FS-1, which is connected between the two ILA-1000, which in turn generates a signal
phase difference of 90 degrees in the electrical ow through two adjacent induction loops.
LOOP SYSTEM WITH 90 DEGREES PHASE SHIFT according to EN 60118-4
f
Re
Im
Phased Array System

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Instruction manual
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ILA-1000
™
Example of a simple LOOP SEGMENT induction loop system with two ILA-1000 (MASTER / SLAVE) and
FS-1 90 degree phase shifter. It is important that the induction loops are approximately the same size.
System with single loops
System with several loops „COMB-SYSTEM“
LOOP SYSTEM WITH 90 DEGREES PHASE SHIFT according to EN 60118-4
Phased Array System
MASTER 0oSLAVE 90o
MASTER 0o
SLAVE 90o
MASTER 0o
SLAVE 90o
ILA-1000 LOOP- AMP
ILA-1000 LOOP- AMP
ILA-1000 LOOP- AMP
ILA-1000 LOOP- AMP

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Instruction manual
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ILA-1000
™
Example of a multiple LOOP SEGMENT induction loop system with (MASTER / SLAVE) conguration to cover
very large areas of constant magnetic eld strength.
Important information:
It is important that the induction loops MASTER and SLAVE are approximately the same size and have a width
of approx. 50 - 66% of the loop length.
System components:
4 x ILA-1000 Induction loop amplier
2 x FS-1 90oPhase shifters
IMPORTANT:
Rooms and areas where an induction loop has been installed should be marked accordingly.
LOOP SYSTEM WITH 90 DEGREES PHASE SHIFT according to EN 60118-4
Phased Array System
ILA-1000 LOOP- AMP
ILA-1000 LOOP- AMP
ILA-1000 LOOP- AMP
ILA-1000 LOOP- AMP
MASTER 0o
SLAVE 90o
SLAVE 90o
MASTER 0o

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Instruction manual
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ILA-1000
™
Due to the phase modulation, the audio signal is shifted by 90˚ phases and forwarded to the second ILA-1000
or to the second induction loop. The second ILA-1000 then has to supply the second parallel induction loop in
the entire inductive hearing aid system.
The rst LOOP amplier of the entire induction loop system works without phase shift with 0˚.
The rst ILA-1000 supplies the rst parallel induction loop in the entire inductive hearing aid system.
In a „LOOP SEGMENT“ system, two ILA-1000s are always working together to form a magnetic eld. As a re-
sult, a uniform eld strength of the magnetic eld is always achieved over the entire area.
The magnetic eld outside the intended range loses strength rather quickly and drops to zero.
This is done by coupling a phase shifter FS-1, which is connected between the two ILA-1000, which in turn
causes a signal phase difference of 90 degrees in the electrical ow through two adjacent induction loops.
LOOP 0oLOOP 90o
ILA-1000
MASTER
ILA-1000
SLAVE
FS-1
PHASE SHIFTER
AUDIO
INPUT
+/-15VDC
INSERT
INSERT
INSERT „A“
INSERT „B“
Phased Array System
LOOP SYSTEM WITH 90 DEGREES PHASE SHIFT according to EN 60118-4

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Instruction manual
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ILA-1000
™
Phased Array System
LOOP SYSTEM WITH 90 DEGREES PHASE SHIFT according to EN 60118-4
MASTER 0o
SLAVE 90o
FS-1 network side
SIGNAL INPUT

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Instruction manual
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ILA-1000
™
MATHEMATICAL CALCULATION OF INDUCTION LOOPS
Induction loop type calculation: double LOOP SEGMENT
1.- First the room length is set (less 10-20 cm of the total length for other installations).
2.- Please set the preferred segment width (between 2 meters and 5 meters, depending on eld loss).
3.- Now the coefcient „X“ can be calculated.
„L“= room length
„S“= preferred segment width
From the table in column „G“, please take the value closest to the calculated value „X“.
The coefcient values P 1 and P 2 indicate the number of segments for both loops.
Calculation of segment width „A“
„L“= room length
„G“= value closest to the calculated value „X“
Calculation of the distance between two segments „B“
Calculation of the shift between the two loops „C“
X= L
S
A= L
G
B=1.6 xA
C= B
2
2.6
3.4
4.2
5.0
5.8
6.6
7.4
8.2
9.0
9.8
10.6
11.4
12.2
13.0
13.8
14.6
15.4
16.2
17.0
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
10
10
11
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
10
10
G P 1 P 2

Calculation example:
Space measuring 25 meters x 8.0 meters; the preferred segment width is 3.0 meters.
„X“ should be calculated:
From the table in column „G“ we take a value of 8.2
The coefcient values P 1 and P 2 show:
P 1 =5
P 2 =5
„A“ should be calculated:
Now the exact distance at the beginning of the two loop segments „B“ / „A“ should be calculated:
Calculation of the shift between the two loops „C“:
X=L
S=25
3 =8.3
A=L
G=25
8.2=3.05 (meters)
B=1.6 xA=1.6 x3.05=4.88 (meters)
C= B
2=4.88
2 = 2.44 (meters)
2.6
3.4
4.2
5.0
5.8
6.6
7.4
8.2
9.0
9.8
10.6
11.4
12.2
13.0
13.8
14.6
15.4
16.2
17.0
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
10
10
11
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
10
10
G P 1 P 2
Instruction manual
- 19 -
ILA-1000
™
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MATHEMATICAL CALCULATION OF INDUCTION LOOPS