Televes Serie H-30 - Manual (Page 16)

H30 - CATV & DOCSIS3.0 Meter / Analyzer
16
6.1. Main window
Below is a capture of a Constellation window with
a brief explanation of its features:
Modulation
List of measurements
with pass/fail indicators
Constellation
diagram
Selected channel
Change using
6.2. Setup
Press to change Constellation options.
- Zoom: OFF, 1 st , 2 nd , 3 rd , 4 th .
Select a quadrant of the constellation to be
represented for more detailed view. Select
Zoom OFF for the full constellation.
- Parameters:
Bandwidth: Auto, 6 MHz, 7MHz, 8MHz
Symbol Rate: Auto, 6111, 5156, Other
Constellation: Auto, 4QAM, 16QAM,
32QAM, 64QAM, 128QAM, 256QAM
Standard: ITU J.83-A, J.83-B, J.83-C
DFE: OFF, ON.
- Tuning: Channel, Frequency
- Save datalog: Saves the current scan
measurements. You can see the datalogs
using the remote control application.
7. CTB & CSO
Cable TV networks are generally located in densely
populated areas or extend over large geographical
regions. This makes cascading large numbers of
amplifiers a frequent necessity that can be the
cause of quality of service to drop below minimum
acceptable levels.
Composite second order (CSO) and composite
triple beat (CTB) are commonly used quality
parameters that can be measured with the H30
to ensure the best possible quality video for
customers receiving analog signals.
In order to get an accurate measurement of CTB
and CSO, the meter must be tuned to an analog
channel with unmodulated video and audio
carriers. Many operators will choose to leave an
unmodulated channel on the system to allow for
this measurement at any time without affecting
customers.
7.1. Main window
Below is a capture of a CTB & CSO window with a
brief explanation of its features: