Brief description
Measurement start up
pag. 20
ST2 User’s Manual
TV Mode
The MEAS key starts the measurements available for the tuned channel. In this section we de-
scribe all the measurements available for a digital TV channel. If you repeatedly press the MEAS
key, the display shows, in sequence, (see next paragraph) all the measurements carried out on
the selected Channel as a numerical value and with a graphics bar that varies its length propor-
tionally to the represented measurement. This bar memorises the peak measurement value.
Tuning:
The upper part of the display shows the tuning parameters for the TV channel.
The displayed parameters are those of the active channel. To change them use
the SELECT [10] key to highlight the fields to be changed and use the UP [7]
and DOWN [9] keys to modify their value. The parameters that can be modified
are: Channel Number, frequency, signal modulation (FM Radio, analogue or
digital TV), audio carrier and its relevant modulation type (this only applies to
analogue signals) and power feed on the RF input. It is only possible to obtain
all the tuning parameters in the first measurement level (see note below).
Measurements:
The lower part of the display shows all the measurements available for the
tuned channel. See section “Useful Suggestions” at the beginning of this User’s
Guide for more details.
Repeatedly press the “MEAS” [6] key to see the following measurements for
analogue signals:
• Measurement level 1: measures the digital power (PWR) (ref. par. 4.1),
• Measurement level 2: measures the Noise Margin (N. MARG.), the signal
quality (QLTY), the MER and SNR with a relevant graphic bar (ref. par. 4.2),
• Measurement level 3: measures the bBER (Pre BER) and aBER (Post
BER) with relevant graphic bars (ref. par. 4.3),
• Measurement level 4: Eye Constellation diagram and all the basic tuning pa-
rameters are displayed (ref. par. 4.4).
• Measurement level 5: all data provided by the NIT card: FEC, Network name,
(NETW NAME), bouquet name (BOUQ. NAME), and DATE (ref. par. 4.5).
NOTE:
• It is possible to vary all the tuning parameters, memory plan, channel number, frequency and channel type (FM
Radio, analogue or digital TV) only when in the first level measurement display. In all other measurement levels only
the memory plan number, the channel or the frequency values may be changed this, only for the user generated
plans. For the Standard TV channel plans (Television) only the channle may be changed, frequncy en RF power
feed can be changed.
• The status bar at the bottom of the display always shows the basic information regarding the measured signal. For
a digital MUX: the network name, the encryption system and a lock icon that indicates if the digital MUX is locked. If
the active channel is digital, a “D” will be displayed on top of the “DIG” writing on the display front panel label.
4.0 TV DIGITAL SIGNAL MEASUREMENTS: MEAS