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Page IV-28
180 DSP Operation Manual
Signal Level Meter
Bit-Error Rate
Select the BER button from the
Display pop-up menu to display the
BER on a graph with a 150 second
measurement period with solid green
lines for Pre BER and solid red lines
for Post BER.
The following measurement results
are displayed with a pass/fail status for
each measurement that is included in
the open limit set:
• Digital channel level value with bar graph
• Pre BER
• Post BER
• Errors per second
• Service errors
HUM (OPTIONAL)
When activated in a 180 DSP, the HUM feature provides users with the ability to
measure the amplitude of the 50/60 Hz, 100/120 Hz, and low frequency interference
present on the QAM carrier of a single selected digital channel.
Select the Hum button from the
Display pop-up menu to display a bar
graph of the HUM levels of the QAM
channel.
The following measurement results
are displayed with a pass/fail status for
each measurement that is included in
the open limit set:
• 60 Hz level value with bar graph
• 120 Hz level value with bar graph
• < 1 kHz (low frequency) level value with bar graph
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