User Guide

PAMS
Technical Documentation
NHB–3
Service Software Instructions
Original 26/97
Page 36
3.5 – External Audio Loop
The first item selects the interface (internal/external).
The sent audio signal level has constant value which depends on the interface.
The frequency is changed, the received signal strength is measured and if too
big difference to expected values is noticed, error message is displayed. Three
different frequencies are used.
When make a measurement is selected, the received signal strength is dis-
played (square root of the received value) on the separate window. If any of the
shown signal values are out of the below presented accepted scale, the OUT
OF RANGE message will be shown.
Frequency HS interface ref./accepted value HF interface ref./accepted value
300
1000
3000
25 / 15...35
32 / 22...42
32 / 22...42
63 / 53...73
68 / 58...78
68 / 58...78
Received level data fields have no value before measurement results are re-
ceived. Below is the separate window where results are shown:
FREQUENCY/Hz 300 1000 3000
RECEIVED LEVEL 120 122 179 OUT OF RANGE
Received level value has scale from 0 to 256.