For those who have a good appreciation of loop systems, the following is a
very quick guide to setting up the amplifier:
All you need is a power source, a signal source and a loop. See “Designing
Induction Loops” handbook or contact Ampetronic
for advice.
Installation
1. Turn all controls fully anti-clockwise.
2. Connect loop cable of appropriate length / gauge.
3. Connect signal input(s).
4. Connect power. See points 6 and 7 in
SAFETY
Section.
5. If rackmounted remove all rubber feet from units. DO NOT re-fit the feet
fixing screws as this may cause damage and invalidate the warranty.
Operation
6. Switch ON - Check green POWER LED flashes during self test and
illuminates continuously when checks are completed.
7. Apply input signal, and increase the input control until two green
COMPRESSION LEDs begin to light on the peaks of the signal.
8. Adjust the LOOP CURRENT control until the CURRENT LEDs illuminate
to achieve the desired peak current.
9. Repeat step 6 for the other input if used.
10.Listen to the magnetic field produced inside the loop area using a
receiving device (e.g Ampetronic ILR3), or examine the performance in
more detail with a field strength meter.
11.Adjust METAL LOSS CORRECTION to achieve a flat frequency
response.
OVERVIEW
QUICK START
M
IC
a
nd
L
IN
E:
S
cr
ew
dr
iv
er
a
dj
us
ta
bl
e
co
nt
ro
ls
w
hi
ch
s
et
th
e
le
ve
l o
f s
ig
na
l f
ed
in
to
th
e
co
m
pr
es
so
r f
ro
m
M
ic
a
nd
L
in
e
in
pu
ts
.
C
O
M
PR
ES
SI
O
N
:
S
ho
w
s
th
e
am
ou
nt
o
f g
ai
n
re
du
ct
io
n
in
de
ci
be
ls
th
at
is
a
pp
lie
d
to
th
e
in
pu
t s
ig
na
l(s
).
LO
O
P
C
U
R
R
EN
T:
S
cr
ew
dr
iv
er
a
dj
us
ta
bl
e
co
nt
ro
l w
hi
ch
s
et
s
th
e
le
ve
l o
f o
ut
pu
t c
ur
re
nt
d
el
iv
er
ed
in
to
th
e
lo
op
.
C
U
R
R
EN
T:
In
di
ca
te
s
th
e
pe
ak
c
ur
re
nt
d
el
iv
er
ed
in
to
th
e
lo
op
.
LO
O
P
M
O
N
IT
O
R
:
3
.5
m
m
ja
ck
s
oc
ke
t f
or
u
se
w
ith
s
te
re
o
he
ad
ph
on
es
to
li
st
en
d
ire
ct
ly
to
th
e
si
gn
al
in
th
e
lo
op
.
O
VE
R
LO
A
D
, O
VE
R
H
EA
T,
L
O
O
P
ER
R
O
R
:
W
ar
ni
ng
L
E
D
s,
s
ee
Tr
ou
bl
es
ho
ot
in
g
s
ec
tio
n
fo
r e
xp
la
na
tio
n
an
d
ad
vi
ce
.
PO
W
ER
:
LE
D
to
in
di
ca
te
A
C
p
ow
er
is
a
pp
lie
d
to
th
e
un
it.
I /
O
:
P
ow
er
s
w
itc
h.
R
ac
k
ea
r f
ix
in
g
sc
re
w
s
- A
P
H
2
sc
re
w
dr
iv
er
is
re
qu
ire
d.
A
C
P
O
W
ER
:
S
ta
nd
ar
d
3-
po
le
IE
C
32
0
co
nn
ec
to
r c
on
ta
in
in
g
pr
im
ar
y
fu
se
fo
r t
he
u
ni
t.
LO
O
P
O
U
TP
U
T:
2
-p
ol
e
hi
gh
c
ur
re
nt
c
on
ne
ct
io
n
to
th
e
lo
op
c
ab
le
.
M
ET
A
L
LO
SS
C
O
R
R
EC
TI
O
N
:
S
cr
ew
dr
iv
er
a
dj
us
ta
bl
e
co
nt
ro
l
w
hi
ch
c
om
pe
ns
at
es
fo
r t
he
fr
eq
ue
nc
y
de
pe
nd
en
t e
ffe
ct
s
of
m
et
al
.
SL
AV
E
I/O
:
P
os
t c
om
pr
es
so
r s
ig
na
l f
or
u
se
w
ith
a
nc
ill
ar
ie
s.
±1
5V
1
50
m
A
D
C
O
U
TP
U
T:
3
-p
in
p
ow
er
M
in
i D
IN
LI
N
E
IN
PU
T:
6
.4
m
m
J
ac
k
so
ck
et
fo
r b
al
an
ce
d
lin
e
le
ve
l s
ig
na
ls
.
M
IC
IN
PU
T:
X
LR
s
oc
ke
t f
or
u
se
w
ith
b
al
an
ce
d
m
ic
ro
ph
on
es
.
G
A
IN
B
O
O
ST
:
In
cr
ea
se
s
ga
in
o
f M
IC
in
pu
t b
y
15
dB
.
PH
A
N
TO
M
:
A
pp
lie
s
+1
5V
p
ha
nt
om
p
ow
er
to
M
IC
in
pu
t.
D
C
INTRODUCTION
The ILD500 Induction Loop Driver has been designed as a high quality
amplifier for use with conference rooms, stadia, theatres, sports halls,
confidential rooms, lecture halls and cinemas. Depending on a number of
factors regarding the installation of the loop and set-up of the amplifier, the
2
ILD500 can provide compliance with IEC60118-4 for areas > 700m .
Ease of installation and use have been major factors in the design,
combined with optimised performance, and freedom from R.F.I
generation.
The ILD500 has two inputs which allow connection to a standard line
level signal and a balanced microphone.
For more complex installations, you may need additional ancillary
equipment such as microphone pre-amplifier(s), adaptor(s) for use
with 100V Line, or signal processing units. See
Accessories
, or
contact Ampetronic for advice.
O
V
E
R
LO
A
D
O
V
E
R
H
E
AT
P
O
W
E
R
C
U
R
R
E
N
T
2.
8
3.
6
4.
5
5.
7
7.
1
9.
0
A
pe
ak
LO
O
P
M
O
N
IT
O
R
M
IC
LI
N
E
LO
O
P
C
U
R
R
E
N
T
C
O
M
P
R
E
S
S
IO
N
6
12
1
8
24
3
0
36
dB
IN
D
U
C
TI
O
N
LO
O
P
D
R
IV
ER
IL
D
50
0
LO
O
P
E
R
R
O
R
1
2
3
AC
P
OW
ER
LO
O
P
O
U
TP
U
T
IN
D
U
C
TI
O
N
L
O
O
P
D
R
IV
ER
IL
D
50
0
D
es
ig
ne
d
an
d
E
ng
in
ee
re
d
in
th
e
U
K
IN
P
U
T
23
0V
45
-
65
H
z
P
ow
er
: 8
5W
Fu
se
: T
6
30
m
A
L
S
LA
V
E
I/
O
±1
5V
1
50
m
A
D
C
O
U
TP
U
T
LI
N
E
IN
P
U
T
M
IC
M
E
TA
L
LO
S
S
C
O
R
R
E
C
TI
O
N
0
0.
5
1.
0
1.
5
2.
0
2.
5
3.
0
dB
/
O
ct
av
e
Gai
n b
oos
t
Pha
nto
m
S
er
ia
l N
º
R
IS
K
O
F
EL
EC
TR
IC
S
H
O
C
K
D
O
N
O
T
O
PE
N
C
A
U
TI
O
N
S
IN
G
LE
–
T
U
R
N
LO
O
P
O
N
LY
Lo
op
re
si
st
an
ce
M
in
:0
.3
W
M
ax
:2
.0
W
Fo
r d
et
ai
ls
c
on
su
lt
in
st
ru
ct
io
ns
o
r
w
w
w
.a
m
pe
tro
ni
c.
co
m