Univox 230450, User Manual

Page: 7 / 16

7
Use Listener as a testing
device
Turn on Listener using the on/off switch. When Listener
is on, the red LED on the front is flashing.
Yellow light indicates -6 dB (re 400 mA/m) and green
indicates 0 dB. If the green light is flashing the field
strength level meets the international IEC standard.
A yellow light indicates that the loop is working but
the field strength level does not meet the IEC-standard
requirement.
To measure the magnetic field strength levels more
exactly and to carry out other important measurements
(for example background noise and frequency
distribution) a professional measuring instrument, like
the Univox FSM 2.0 has to be used.
It may be difficult to monitor the LED if wearing the
Listener around the neck by the strap. We therefore
recommend to hold the Listener in front of you at the
height where you want to check the field strength.
A hearing aid is approximately located 120 cm above the