The sample frequency to be used for all digital audio frequency
measurements (in all digital measurement functions) is selected by the
lower left soft key. There are three options:
.
MEAS – The measured sample rate is used to compute audio
frequencies. This is the most commonly used, but if the
incoming sample rate is very unstable the frequency
measurements will be also.
.
STAT – The sample rate encoded in the incoming status bits is
used to compute audio frequencies. This is a stable value, but
not all devices indicate their sample rate in their status bits.
.
OUTP – The digital generator sample rate is used to compute
audio frequencies. This is used when measuring pitch-shifting
devices.
The upper center section of the display shows the peak-to-peak voltage
of the incoming digital signal, in Vpp. There are no other units
available. The upper center soft key selects the termination impedance
of the digital input, either HiZ or LoZ. The HiZ option provides a
termination ≥2.5 kΩ on the AES/EBU XLR input and ≥3kΩ on the
SPDIF/EIAJ BNC input. The LoZ option provides a termination of
110 Ω on the AES/EBU XLR input and 75 Ω on the SPDIF/EIAJ BNC
input. The LoZ impedances are required by the interface specification,
so they should generally be used unless another device connected in
parallel with the test instrument is providing termination.
The upper right section of the display shows the delay of the signal,
either from the ATS-1 Dual Domain output or the Reference Input on
the rear panel. The upper right soft key selects among the available
units: UI (unit intervals), smp (samples), or s (seconds).
The INPUT A and INPUT B buttons control whether the input comes
from the rear panel input or the internal gen-mon path. Since there is
no channel to select, both buttons perform the same function. The first
press on either button selects the rear panel input, and an ‘I’ shows in
the reading displays. A second press on the same INPUT button will
select the gen-mon path, and a ‘G’ shows in the reading displays.
& For more
information on
the Status Bits,
see page 3-20.
& For more
information on
connecting to the
Reference Input,
see page 3-36.
4 Functions
Function Descriptions Digital I/O
ATS-1 Dual Domain User's Manual 4-43
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