The SINAD reading is shown in the top left corner of the display. The
units cannot be changed. The top center of the display shows the
amplitude of the signal before filtering. The amplitude units may be
selected by pressing the top center soft key.
The top right soft key selects the notch steering mode. There are three
notch steering modes, selected by subsequent presses:
.
OFF – In this mode, the filter is tuned to either 400 Hz or 1 kHz,
as displayed in the bottom left corner of the display.
.
GEN-TRACK – This causes the notch to be tuned to either the
analog or digital generator frequency. If the Generator Control
mode is Analog Audio Generator, then the notch will track the
analog generator. If it is one of the digital modes, the notch will
track the embedded audio signal on the digital generator.
.
FIX-TUNE – This causes the notch to be tuned to a frequency
specified by the user. The current tuning frequency will by
shown on the upper right of the display, and it may be adjusted
with the FREQUENCY controls. This will not give a valid
SINAD reading unless it is tuned to the fundamental frequency
on the input.
SINAD measurements are generally taken at 400 Hz or 1 kHz, so these
frequencies are designed to be the most convenient. When the notch
steering mode is set to ‘OFF’, the lower left soft key selects between
400 Hz and 1 kHz. Changing this setting changes both the generator
and the notch filter to the selected frequency. The generator frequency
may then be changed using the FREQUENCY controls, but the notch
will remain parked, so the reading will be invalid.
4 Functions
FUNCTION Descriptions SINAD
ATS-1 Access User's Manual 4-23
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