Option S-AES17
Option S-AES17 adds the capability to insert a 20 kHz or 40 kHz low-pass filter
following the selected analog input preamplifier, but before any signal processing
within the analog analyzer. It enables accurate noise and THD+N measurements of
sigma-delta converters and switching power amplifiers that contain large amounts of
unwanted energy above the normal audio bandwidth.
High performance sigma-delta converters and switching power
amplifiers often contain out-of-band energy that can exceed the
in-band audio signal. Standard bandwidth limiting and noise
weighting filters will not give accurate measurements due to
their relatively low roll-off rates.
Option S-AES17 also includes the FLP-B20K and FLP-B40K option filters. These
have been designed to work in tandem with the selectable pre-analyzer filters to
provide THD+N measurements in accordance with AES17-1998.
Pre-Analyzer Filter Response
(also affects the LEVEL and FREQUENCY meters of the selected channel)
20 kHz ±0.10 dB, 10 Hz–20 kHz
(typ –3 dB at 25 kHz, <–60 dB above 60 kHz).
40 kHz ±0.10 dB, 10 Hz–40 kHz
(typ –3 dB at 50 kHz, <–60 dB above 120 kHz).
Residual THD+N (1 kHz)
“20k AES17” mode £(0.00030% + 1.0 µV) [–110.5 dB].
“40k AES17” mode £(0.00040% + 1.4 µV) [–108 dB].
Option S-AES17 Chapter 6: Specifications
Getting Started with Your 2700 Series Instrument 69
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