Only one channel can be measured at a time. Pressing either the
INPUT A or INPUT B key will select which channel to measure. A
second press on the same key will measure the gen-mon signal from
the same channel.
If the analyzer is in analog mode, the amplitude can be measured in
units of V, dBV, dBu, dBm, dBr, dBg, or W. In digital mode, the
available units are FS, dBFS, and dBr. The units are selected by the
upper left soft key.
The measured frequency of the input signal is displayed in the upper
right corner of the display, or the frequency of the bandpass filter if the
SELECTIVE filter is chosen.
The amplitude is measured using true RMS detection except in a few
of the filtering modes described below. Several types of filters may
also be applied to the amplitude measurement.
The type of filter is selected by the lower left soft key. Three types of
filters are available:
.
UN-WTD – The ‘unweighted’ selection provides no filtering
except selectable bandwidth-limiting:
.
The lower center soft key selects the lower band limit (<10
Hz, 22 Hz or 400 Hz).
.
In analog mode, the lower right soft key selects the upper
band limit (>300 kHz, 22 kHz, 22 kHz-QPK, 30 kHz, 80
kHz). The 22 kHz-QPK selection uses the quasi-peak
detector instead of the true RMS detector in accordance
with CCIR-468. The 22 Hz lower limit is only available if
the upper limit is 22 kHz; the <10 Hz lower limit is only
available with other upper limits.
.
In digital mode, the lower right soft key selects the upper
band limit (15 kHz, 20 kHz, Sample Rate/2, 22 kHz, 22
kHz-QPK). The Sample Rate/2 selection always selects an
upper band limit of half the incoming sample rate, and the
22 kHz-QPK selection is the same as in the analog domain.
.
SELECTIVE – This selection provides a tunable bandpass filter.
In analog mode, the filter has a bandwidth of 1/3 octave; in
digital mode, the bandwidth is 5.3% of the tuned frequency.
& For a more
detailed discussion of
units, see page 3-26.
& The shapes of the
bandwidth-limiting
filters are shown on
page .
4 Functions
Amplitude Function Descriptions
4-2 ATS-1 Dual Domain User's Manual
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