No other filtering is provided. The top right corner of the
display shows the filter center frequency, which can be adjusted
with the FREQUENCY controls. The SELECTIVE filter can be
used to create spectrum-analysis sweeps. In this type of
measurement, a narrow bandpass is swept across a range of
frequencies, taking an amplitude measurement at each step.
.
WTD – The ‘weighted’ selection allows selection of a variety of
weighting filters with a selectable lower band limit. The lower
center soft key selects the lower band limit (<10 Hz or 400 Hz).
The lower right soft key selects among the following weighting
filters:
.
ANSI/IEC-A – A-weighting filter per IEC 179, true RMS
detector
.
CCIR-1k – Weighting per CCIR-468, true RMS detector
.
CCIR-2k – Weighting per CCIR-468, but with 0 dB gain
point at 2 kHz rather that 1 kHz, true RMS detector
.
CCIR-QPK – Weighting per CCIR-468, quasi-peak detector
.
CCIR-ARM (analog only) – Weighting filter shape per
CCIR-468, but with 0 dB gain point at 2 kHz rather that 1
kHz, average-responding detector per Dolby Bulletin 19/4
.
AUX1 (analog only) – Weighted with optional weighting
filter installed in slot 1. If there is no filter in slot 1, the
display will read ‘NO AUX1’ and no filter is selected.
.
AUX2 (analog only) – Weighted with optional weighting
filter installed in slot 2. If there is no filter in slot 2, the
display will read ‘NO AUX2’ and no filter is selected.
& For more
information on
sweeps, see
page 4-53.
4 Functions
Function Descriptions Amplitude
ATS-1 Dual Domain User's Manual 4-3
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