The QAM threshold parameters are:
QAM threshold - Edit:
Name:
A text field describing the threshold template
Maximum pre FEC
BER:
Threshold level for bit error ratio before forward error
correction
Maximum post FEC
BER:
Threshold level for bit error ratio after forward error
correction
Maximum MER:
Threshold level for modulation error ratio (dB)
Minimum signal to
noise ratio:
Threshold level for signal to noise ratio (dB)
Minimum signal
strength:
Minimum threshold level for signal strength.
This is a measure of the stream signal power. It is
expressed according to the level mode selection made in
the
Setup - ETR
view:
dBm: in decibels relative to a reference value of
1
mW
dBuV: in decibels relative to a reference value of
1
µ V
dBmV: in decibels relative to a reference value of
1
mV
Maximum signal
strength:
Maximum threshold level for signal strength.
This is a measure of the stream signal power. It is
expressed according to the level mode selection made in
the
Setup - ETR
view:
dBm: in decibels relative to a reference value of
1
mW
dBuV: in decibels relative to a reference value of
1
µ V
dBmV: in decibels relative to a reference value of
1
mV
Signal strength
offset:
It is possible to use the signal strength offset adjustment
to calibrate the QAM demodulator. This is achieved by
tuning to a QAM signal of known level and setting this
adjustment accordingly. Only relevant for VB262.
Maximum frequency
offset:
Maximum QAM centre frequency offset. Only relevant for
VB262.
Frequency offset
zero adjust:
It is possible to use the frequency offset zero adjustment
to calibrate the measurement. This is achieved by
compensating for the frequency offset measurement done
at the time of calibration in order to get a measurement
close to zero. The auto threshold functionality does this
automatically. Only relevant for VB262.
Maximum symbol
rate offset:
Maximum QAM symbol rate offset. Only relevant for
VB262.
Maximum symbol
zero adjust:
It is possible to use the symbol rate offset zero adjustment
to calibrate the measurement. This is achieved by
compensating for the symbol rate offset measurement
PROBE USERS' MANUAL VERSION 5.0
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