UNAOHM
EP2500 (Rev. 0)
31
7.19.1
Video-to-Audio Ratio
The instrument makes it possible to automatically measure in dB the ratio between the video carrier
level and that of the audio mono and stereo dual tone carriers of a television channel. The instrument
must already be exactly tuned to the video carrier. An easy way to accurately tune the video carrier of
the channels is to tune in mode channel (see section 7.6). Press
MORE
, then
V/A
: the instrument
displays the level difference between the two carriers. The multifunction key
STEREO
or
MONO
establishes whether or not the second stereo subcarrier is read. The measurement, carried out by
pressing
EXEC
, remains on the OSD until the key
BACK
is pressed.
Figure 13
V/A ratio measurement display
7.19.2
(DCP) Digital Channel Power
To measure the power of a digital channel:
1.
Tune to the center of the channel to be measured (see section 7.6).
2.
Press
MORE
, then
DCP
.
3.
If the bandwidth of the channel to be measured is not the default one (8 MHz for terrestrial and 30
MHz for SAT), press
CHBW
and set it by means of the Shaft Encoder.
4.
The measurement unit of the result may be different from the current level measurement unit. If it is
not the desired one, press
UNIT
and select it by means of the Shaft Encoder.
5.
The result appears on the display and remains there until the key
BACK
is pressed
.
NOTE:
correction coefficients are applied to this measurement, depending on the measurement
bandwidth and the type of response of the internal detector; accuracy, therefore, is guaranteed
for
digital signals only.
Figure 14
DCP measurement display
V/A
478.12 CH 22 pr 00
M20
EXEC
***
STEREO
BACK
VA1:14.4 VA2:19.7
DCP
1740 SC0:6.50 pr 00
30 CHBW 13V k M20
BER
UNIT
CHBW
BACK
-37.4 dBm
DCP
88.1 dBuV
LEV
