11
15� Set field strength
(6)
to -3dB to 0dB at the peaks� If
Peak
(8)
LED flickers only
momentarily the connection is acceptable� If
Peak
LED indicates continuously, try
rewireing the connections in the junction box in subsequent order:
II)
one wire single
turn and then
III)
two parallel wires single turn�
With this procedure the unit will operate with the highest output possible without
generating any heat�
Note
: To quickly set up the field strength for a real program source, a PPM instrument
is helpful� The Univox Listener has a calibrated level indicator that quickly finds the
highest peak�
Note
: When adjusting the field strength peaks, -2dB field strength works best, due to
different dynamic headrooms in hearing aids�
16� Check basic frequency response according to IEC 60118-4, using a field strength meter,
e�g FSM 2�0� If necessary, follow
Frequency adjustment procedure
(see page 12)�
17� Check the sound quality by using an external listening device (Listener or FSM 2�0),
Monitor speaker connector
(14)
or
Monitor
(9)
for headphone (volume control on rear
panel
Monitor
(13)
)� When operating at maximum output on low impedance, i�e single
turn loops, the automatic limit protection circuit may cut programme peaks� This can
be avoided by changing to a 2-turn loop or reduce the output current setting�
18� Start the
Commissioning
process to certify the installation (see page 9)�
I) 2-turn serial
connection
II) one wire single turn
III) two parallel wires
single turn
