VeEX VePal CX350, User Manual

Page: 23 / 81

7.0 Test Applications
7.1 Single Channel Measurement
7.1.1 Analog Channel Measurements
7.1.2 Digital Channel Measurements
7.1.3 Constellation Measurements
7.1.4 Impairment Measurements
7.2 Tilt Analysis
7.3 System Scan
7.4 Spectrum Analysis
7.5 Cable Modem
7.6 Upstream Signal Generator (USG)
7.7 Installation Check
7.8 Advanced Tools
7.8.1 Return Path Analysis
7.8.2 Sweep Operations
7.8.3 Remote Operations
7.8.4 R-Server
7.8.5 RP Balancing
7.8.6 TDR
7.8.7 DS1
7.8.8 OFDM
7.1 Single Channel Measurement
Overview:
The Single Channel SLM function performs a level measurement of a user-selected frequency or a channel that is defined in the selected and active channel table. The
contents of the Single Channel screen will depend upon whether the selected channel contains an analog or digital signal.
In analog mode, both video and audio levels including Video/Audio (V/A) and Carrier to Noise (C/N) ratios are indicated. In digital mode, the average power of the QAM
channel is measured and MER and BER performance and other related parameters are displayed.
The channel to be measured can be entered by either tapping on the Channel box or the Frequency box and use the pop up keypad to enter the channel number or
frequency respectively. After the first channel is entered, use the Arrow Up key or Down key to scroll through the next or previous channel in the channel table. About 3
seconds after the user releases the Arrow Up or Down key, the measurement will start. CX350 remembers the last channel measured, and upon entry, the last channel
number will be used.
CX350 supports histogram analysis, which records the current minute by second and past 60 minutes by minute.
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7.1.1 Analog Channel Measurements
The following measurement information is provided for analog signals:
Channel number (defined in the channel table)
Channel frequency (defined in the channel table)
Video Power Level in dBmV including graphic bar indication
Audio1 Power Level in dBmV including graphic bar indication
Video/Audio1 ratio in dB
Audio2 Power Level in dBmV including graphic bar indication
Video/Audio2 ratio in dB
Max Adjacent Channel rejection in dB
Carrier to Noise (C/N) in dB)
HUM in %
Single Channel - Analog Results
CX350 e-Manual D07-00-037 RevC01 Page 23 of 81