14
4.3.5 EXPANDED SPECTRUM measurement mode
This measurement is selected from the SCAN mode by pressing the
F3
key. This mode
displays spectrum of the input signal in scaleable frequency range. See Figure 4.3.10:
Figure 4.3.10
On the screen you will see the following data:
1 – Frequency point indicated by the marker
2 – Command line with commands activated by
F1
,
F2
and
F3
keys
3 – Measured signal level of the frequency point indicated by the marker, in dBmV,
dBµV or dBm
4 – Status of AMP power supply (Section 4.3.8)
5 – Marker
Adjust the marker position by ◄ and ► arrows. Select frequency range scale with
F1
and
F2
keys from the following list:
a)
. Spectrum diagram shows a span resolution of 14MHz frequency range.
b)
. Spectrum diagram shows a span resolution of 28MHz frequency range.
c)
. Spectrum diagram shows a span resolution of 55MHz frequency range.
d)
.Spectrum diagram shows a span resolution of 110MHz frequency range.
You can return to SCAN measurement mode by pressing
F3
key.
AMP power supply, is controlled by pressing the
key briefly (section 4.3.8).
4.3.6 MER/BER measurement mode
The
icon in the Main menu refers to MER/BER measurement mode. Here we
see the DVB-T signal quality table of parameters. The screen view shows in Figure 4.3.11:
Figure 4.3.11
On the screen you will see the following data:
1 – Channel number
2 – Selected frequency and frequency offset in MHz
3 – Signal modulation parameters (subcarrier modulation type and subcarriers number)
4 – MER and Margin values in dB
