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Chapter 23 243
CMMB Measurement Application
N6158A, CMMB Measurements Application
Description Specifications Supplemental Information
Modulation Analysis Settings
Device Type Transmitter or Exciter
Trigger FreeRun, External 1, External 2 or
Periodic Timer
• External Trigger is used with 1
PPS input from GPS, (this trigger
method is recommended for SFN
mode)
• Periodic Timer Trigger is used
usually used for MFN mode or
SFN mode without 1 PPS input
• FreeRun can be used when all of
the timeslots use the same Mod
Format (this trigger mode is
recommended for Exciter under
Test Mode)
Sync Frame Now Immediate Action to synchronize
CMMB signals when using Periodic
Timer or External Trigger
Meas Type PLCH, Timeslot or Frame
PLCH Settings CLCH or SLCH (0-38) Enabled when Meas Type is PLCH
Timeslot Settings Start Timeslot
Meas Interval
Modulation Format: BPSK, QPSK
or 16 QAM
Enabled when Meas Type is
Timeslot
MER Limit 38 dB as default Auto or Manual
Spectrum Normal or Invert
Clock Rate 10.0 MHz Auto or Manual
Demod Symbols Per Slot 4 to 53
Out of Band Filtering On or Off
Data Equalization On or Off