Chapter 2
GSM Call Mode Operation
GSM tests
4460 GSM System Option and 4468 EDGE System Option
Version 12.20
87
Audio measurements
The audio signal generator and the audio measurements are accessible with a
push on the
Audio
softkey. Alternatively, the measurements are also accessible
through the
T
OOLS
>
Audio
keys.
The audio functions can be started after setting up a voice call, i.e. when the
mobile phone is frequently transmitting and receiving a signal over either a TCH/
FS, a TCH/EFS or a TCH/HS. Please read more about the audio functionality in the
Tools chapter on
page 229
.
Display markers
The 4400 offers two markers for easy reading of the graphic displays...
Test parameters
These entry fields offer the possibility to easily alter the following important test
parameters.
...of the phase/frequency test menu
On the Bit entry fields, you set the markers to the
required horizontal positions (= bit values). The cor-
responding result fields (deg) show the measurement
values obtained for the two positions in degrees.
The third row shows the difference between the
selected bit positions and the difference between
the two corresponding measurement values.
...of the burst test menu
On the μs entry fields, you set the markers to the
required horizontal positions (= time positions, rela-
tive to the beginning of the burst). The correspond-
ing result fields (dB) show the measurement values
obtained for the two positions in dB.
The third row shows the difference between the
selected time positions and the difference between
the two corresponding measurement values.
By changing the value of the Resolution selection
field, you can easily modify the vertical resolution of
the graphic display.
Smaller values provide a higher resolution and thus
more details; higher values provide a better over-
view.
Note:
This selection field is available in the phase/
frequency test menu only.
