frequency is above 3.35 kHz, the display will read Hi Fr (high
frequency). No valid W+F readings can be obtained outside of this
frequency range.
The upper center section of the display shows the level (amplitude) of
the incoming signal. The upper center soft key selects among the usual
set of absolute and relative amplitude units.
The upper right section of the display shows the frequency of the
incoming signal. This should be approximately 3 kHz or 3.15 kHz,
depending on the frequency of the test signal. The upper right soft key
permits measurement of the percent deviation from the ideal. The
units change to ∆% and the top part of the display shows the reference
frequency, either 3 kHz or 3.1 kHz. Additional presses on the upper
right soft key will cycle through the absolute frequency display and
percent deviation for each of the available reference frequencies.
The lower left soft key allows selection of a weighting filter that
approximates the ears 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. The INPUT
B button will select input B for measurement. Pressing GEN after
selecting the measurement channel will select the gen-mon path for
that channel.
4 Functions
Function Descriptions W+F (Wow and Flutter)
ATS-1Access User's Manual 4-33
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