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TV MEASUREMENT
Note
LEVEL OVERFLOW AND UNDERFLOW
At a level < 30 dBµV the LC display indicates an underfl ow.
LC display:
• Channel: CH 05
• Operating mode: Analogue cable TV
• Level: underfl ow
At a level > 120 dBµV the LC display indicates an overfl ow.
LC display:
• Channel: CH 05
• Operating mode: Analogue cable TV
• Level: Overfl ow
Levels of DVB-C and DVB-T-/H signal can only be measured if
Digital reception has been set.
AUDIO CARRIER SPACING AND LEVEL
TV stations can transmit on a second audio carrier - FM-modulated
(analogue) - or in Nicam format (digital). Depending on the set
standard the audio carriers are assigned various frequencies (see
table). After channel and frequency entry audio carrier 1 is always
set.
Standard TT1 TT2 Nicam
B/G 5.5 MHz 5.74 MHz 5.85 MHz
D/K 6.5 MHz 6.26 MHz 5.85 MHz
I 6.0 MHz ----- 6.552 MHz
L AM 6.5 MHz ----- 5.85 MHz
In audio carrier measurement the signal spacing between audio
and video carrier in dB is measured fi rst, then the absolute audio
carrier level in dBµV. During the measurement the speaker is
mute. After completion of the measurement the modulation of the
audio carrier last measured can be heard.
COMMAND OVERVIEW FOR “MEASURE TV AUDIO CARRIER FREQUENCY”
Switch to audio carrier menu
... Switch between TT1 and TT2 (see table)
Audio carrier measurement while button is
pressed
Switch to Nicam reception