NR-900S
Operation Manual
16
NR-900S WORKABILITY TEST
-
Use button
ATT
to
set maximal sensitivity of the receivers (every
LED at the
ATT
scale are ON).
-
Use button ‘
P
’ to adjust maximal output power of the probing
signal (all 3 red LEDs are ON).
-
Put on the headphone.
-
Analyze the interference environment aiming antenna system to
different directions.
-
In case of noticeable interference antenna unit should be oriented
so that the interference signal is not heard in the headphones
.
-
Make sure that no
2
-nd
, no
3
-rd
harmonic reply is indicated by
corresponding LEDs or audio signals (use
2/3
button to check this).
-
Use
P
button to adjust the device minimum output.
-
Place the test
unit vertically 0.4 m
in front of the device
antenna unit.
-
The interrupted audio signal should be heard in the headphone, as
well as 6 red & 6 green LEDs shine at the corresponding bar-graph
scales.
-
Altering the target imitator location in front of antenna system try
to obtain the full
2
nd
harmonic LED-scale indication.
-
Use 2/3 button to switch headphone for 3-rd harmonic reply and
check the device operation in this mode (this manipulation should
be confirmed by audio signal of a higher tone)
0.4 m
Imitator
Fig. 14 NR-900S operation test
by means of standard imitator
