Approved Document No. DAU0000567 Rev 5 • Page 1 of 4
Approved Document No. DAU0000567 Rev 5 • Page 4 of 4
PL1
PORTABLE INDUCTION LOOP AMPLIFIER
USER INSTRUCTIONS
Please read ALL of these instructions before use - failure to do so may result in poor performance
What is an induction loop system?
Audio frequency induction loop systems (AFILS) work by transmitting amplified sound to
NHS hearing aids. Most hearing aids have a ‘T’ or ‘MT’ switch which allows them to pick up
the electromagnetic signal generated by an induction loop system. The hearing aid converts
this signal into a sound suited to its users specific hearing requirements, allowing them to
participate more fully in general conversation, ordering goods or services, etc.
The PL1 is a compact audio-frequency induction loop amplifier capable of generating a loop
listening field of more than 100mA/M (the level required by BS 7594 : The code of practice for
audio-frequency induction loop systems) at distances greater than 1m from the unit itself.
Suitable for counter, table or desktop use, it is ideal for restricted person to person contact in
areas such as banks, post offices, small meeting rooms, reception desks, open plan offices and
ticket booths.
Its portable, lightweight design and simple one button operation allows it to be moved
easily from location to location and ready for use within seconds, facilitating easy and
economical compliance with the Disability Discrimination Act.
Portable Induction Loop System Specification
©
Errors and omissions excepted. These instructions are general and cannot be considered to cover every aspect of AFILS installation.
No responsibility can be accepted by the manufacturer or distributors of this equipment for any misinterpretation of an instruction
or guidance note or for the compliance of the system as a whole. The manufacturer of this equipment operates a policy of continuous
improvement and reserves the right to alter product specifications at its discretion and without prior notice.
Charging the amplifier
To ensure the amplifier is ready for use at short notice it should
be regularly charged using the PL1/PSU1 plugtop charger.
Simply connect the lead from the PL1/PSU1 plugtop charger to
the socket marked
charger
on the rear of the amplifier and
the charger itself to a standard 13A mains socket (see right).
Whilst charging, the
charging
indicator on the rear of the
amplifier will be lit green and the
batt.status
indicator will
flash yellow. When the
batt. status
indicator goes out the
amplifier is fully charged and ready for use.
The amplifier can be used as normal when charging or, if desired, remain permanently
connected to the charger with no adverse effects.
To maintain the battery in good condition the amplifier should be charged overnight at least
once a month or more regularly if its usage demands it.
You must charge the amplifier whenever the PL1’s
batt.status
light is lit yellow as this indicates
the battery is low.
Under normal circumstances, there will be enough battery capacity to use the
amplifier for a period of time before it shuts down due to insufficient charge.
If left unused for long periods, e.g. six months, a fully charged battery will slowly discharge itself.
If the amplifier is stored away for over a year without recharging, the battery WILL completely
discharge itself and will need replacing. This will be indicated by the yellow
batt. status
indicator
being permanently lit after repeated attempts to fully recharge it. Note that a fully discharged
battery must be replaced by a suitably qualified engineer.
Accessories & spares available from your distributor
TEAR-P
“AFILS available” sticker;
CASE1
Robust plastic storage/carry case;
AMT
Remote desk/tie
microphone;
PL1/PSU1
Replacement PL1 plugtop charger, UK type;
PL1
Replacement PL1
amplifier (PSU not included);
PL1/BATT
Replacement battery for PL1;
AHHM/H
FoSmeter ‘H’
combined magnetic field strength meter/loop listening device;
HEAD1
Headphones for use with
AHHM/H.
Only use the PL1/PSU1
plugtop charger
!
• Internal 12V VRSLA (Valve Regulated Sealed Lead Acid) battery - monitored against deep discharge.
• Expected battery life five years under normal operating/charging conditions.
• 230v a.c. separate plugtop charger included in PL1/K1, PL1/K2, PL1/K3 and PL1/K4 kits.
• Automatic shut-off timer (nominally set to 10 minutes, adjustable to 30 minutes or 60 minutes).
• 0.5m optimum internal microphone operating distance.
• 100Hz-5Khz frequency response and fully automatic compressor (up to 5:1 max).
• Nominal 1 metre operating range at 1KHz providing an AFILS field strength of >100mA/M.
• <1% Total harmonic distortion of output current @1Khz, 1M distance & 100mA/M field strength.
• PL1 dimensions (WxHxD) = 250 x 300 x 100mm approx.
• PL1 weight (including battery) = 1.7kg
PL1/
PSU1
!
IMPORTANT: The amplifier must be charged for up to 24 hours upon delivery.
Note that the amplifier can be used as normal whilst it is charging.
