The lower left soft key allows selection of a weighting filter that
approximates the ear’s sensitivity to wow and flutter. The ‘WTD’
selection uses this filter; the ‘UN-WTD’ selection bypasses it, for a flat
response. All the major wow and flutter standards recommend use of
this weighting filter.
The lower center soft key selects the standard to which the
measurement is made. Presses of the key will cycle through IEC,
NAB, and JIS standards. The DIN standard is identical to the IEC
standard. The different standards require different test tone
frequencies and detector response characteristics. The generator
frequency is changed to the tone frequency required by the selected
standard, and the proper detector response is selected.
The lower right soft key selects the reading display mode. PEAK and
2σ are supported. Selecting PEAK will give the maximum value of the
wow and flutter over about a 1/3 second interval. Selecting 2σ will
give the maximum value exceeded no more than 5% of the time (the
second-highest reading of a 20-reading group).
The INPUT A button will select input A for measurement. A second
press of the button will select gen-mon channel A for measurement.
The INPUT B button will select input B for measurement. A second
press of the button will select gen-mon channel B for measurement.
Wow and flutter of 3-head tape machines should not be measured
during simultaneous record-reproduce mode, since this will result in
spectral nulls which can give erroneously low readings.
4 Functions
W+F (Wow and Flutter) Function Descriptions
4-32 ATS-1 Dual Domain User's Manual
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