CTB offset : 0 MHz
CSO-3 offset: -0.75MHz
CSO-4 offset: -1.25MHz
The CX380S-D3.1 first measures the signal levels at those frequency offsets of a live carrier then prompts the user to either use a channel
blocker or remove the carrier. The same frequency offsets will be measured after the carrier is removed or blocked and they are used to
compare with the previously measured results with a live carrier to determine the final CSO/CTB values.
Alternatively, the CX380S-D3.1 can measure the CSOs of a live carrier without using a channel blocker or removal of the carrier by
selecting the GATED CSO mode. In this mode, the CX380S-D3.1 measures the noise level at the frequency offsets during the sync pulse
period where the carrier signal is quiet then compare with the measured levels during the non sync pulse period.
7.1.2 Digital Channel Measurements
When testing a digital channel, the unit first tries to lock onto the QAM signal. Once the QAM signal is locked, the unit starts displaying the
digital measurement results as well as the constellation diagram.
Note: QAM unlock
If the unit is unable to lock onto the digital channel, the following icon is displayed.
Always ensure QAM lock is achieved prior to making Constellation and related digital measurements.
SLM button:
The following measurement information is provided for digital signals:
Channel number (defined in the channel table)
Channel frequency (defined in the channel table)
Channel or program name
Modulation type measured
QAM Power Level in dBmV/dBuV including graphic bar indication
Modulation Error Ratio (MER) in dB
Pre BER & Pre Error Second ratio
Post BER & Post Error Second ratio
Severely Error Second count
Max Adjacent Channel Delta in dB
Graphic limit indicators are provided for all graphically displayed signal levels. Numeric data that is outside of limits are displayed in red.
SLM Measurement (Digital Carrier)
Summary of Contents for VEPAL CX350S-D3.1
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