The upper left corner of the display shows the wow and flutter reading,
which is the amount of fluctuation in the frequency of the incoming
tone. The only available unit is percent. If the input frequency is
below 2.8 kHz, the display will read ‘Lo Fr’ (low frequency). If the
input 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 measured frequency
of the selected input signal. Pressing the upper right soft key will cycle
through the following options:
.
FREQ - measures the exact measured frequency of the input
.
3.00 kHz - measures the frequency in units of ∆%, as a percent
deviation from the 3.00 kHz ideal frequency (for use with 3 kHz
reference tones)
.
3.15 kHz - measures the frequency in units of ∆%, as a percent
deviation from the 3.15 kHz ideal frequency (for use with
3.15 kHz reference tones).
.
OFF - frequency counter is disabled
GENERATOR
MONITORS
B
A
INPUT
RANGING
INPUT
TERMINATION
INPUT
TERMINATION
LCD DISPLAY
SECONDARY
READING
DETECTOR
INTERNAL
JUMPER
INPUT
MONITOR
SPEAKER/
HEADPHONE
READING
MONITOR
CHANNEL A
CHANNEL B
READING
DETECTOR
(IEC/NAB/JIS)
WOW AND
FLUTTER
DISCRIMINATOR
WEIGHTING
FILTER
PEAK/2-SIGMA
PROCESSOR
FREQUENCY
COUNTER
Figure 4-29. Block diagram of Analog Wow and Flutter measurement
4 Functions
Function Descriptions W+F (Wow and Flutter)
ATS-1 Dual Domain User's Manual 4-31
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