Measuring System Performance: Hum Measurements
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Fig. 6-8 The HUM Measurement Screen
A proprietary DSP technique enables hum measurements, in-service, on
modulated carriers (non-scrambled channels).
The SDA-5000 can measure the 1 Hz hum component. To activate this
feature, set the fundamental hum frequency in the MEASUREMENT screen
to 1 Hz. The filter options on the Hum display will then become 1 Hz, <50 Hz,
and <1 kHz.
See Also
½ "Measurements Configuration" in Chapter 2 explains how to
set the fundamental hum frequency (page 25).
NOTE: The <1 kHz setting does not include the 1 Hz
component, it only includes 50 to 1,000 Hz.
CAUTION ! Hum measurements taken while the desktop
charger is in use will affect the Hum reading. For the most
accurate reading disconnect the charger prior to taking
Hum measurements.
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