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Page IV-47
180 DSP Operation Manual
Signal Level Meter
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 video carrier of a single selected analog channel.
Select the Hum button from the
Display pop-up menu to display a bar
graph of the HUM levels of the analog
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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