DSP Analysis of Analog Signals
Available only in SYS-2712 and SYS-2722 configurations. Signals connected to
the analog analyzer input connector may be routed through stereo A/D converters for
enhanced analysis capabilities. There are two selectable converters. The high-
resolution converter (“HiRes A/D”) is optimized for signal analysis and FFT displays
up to 30 kHz. It offers the best residual noise and distortion performance. The high
bandwidth converter (“HiBW A/D”) is optimized for signal analysis up to 120 kHz.
The term “f
s
” refers to sample frequency (also called sample rate), in hertz.
High Resolution Converter
A/D Resolution 24-bit sigma-delta.
Sample Rate (f
s
) 8 ks/s–108 ks/s variable; or 65.536 ks/s fixed.
Flatness (1 kHz ref) ±0.01 dB to
045. ´ SR
or 20 kHz, whichever is
lower.
Alias Rejection
19
typically >115 dB for signals >0.554 x f
s
.
Distortion –105 dB for f
s
£65.536 ks/s,
–102 dB for f
s
up to 100 ks/s.
High Bandwidth Converter
A/D Resolution 16-bit sigma-delta.
Sample Rate (f
s
) 16 ks/s–200 ks/s variable; or 131.072 ks/s, or
262.144 ks/s fixed.
Flatness (1 kHz ref) ±0.01 dB to 20 kHz,
±0.10 dB to 120 kHz (262.144 ks/s).
Alias Rejection
18
typically >85 dB for signals > 0.540 x f
s
.
Distortion –92 dB for f
s
£200 ks/s,
–90 dB with f
s
= 262.144 ks/s.
FFT Signal Analyzer
(With “FFT” DSP program)
Acquisition Length 800 samples to 4 M samples in 15 steps.
Transform Length 256–32768 samples in binary steps.
Processing 48 bit.
Amplitude Accuracy ±0.09 dB, 20 Hz–20 kHz,
Flat-top or Move to Bin Center windows.
Averaging 1–4096 averages in binary steps. Averaging is
power-based (frequency domain), or synchronous
(time domain).
Waveform Display Modes
Time Domain Normal, Interpolate, Peak or Max.
Frequency Domain Peak pick (highest bin amplitude is displayed
between the requested graph points).
Frequency Display Modes Peak pick, individual bin.
Chapter 6: Specifications DSP Analysis of Analog Signals
70 Getting Started with Your 2700 Series Instrument
19
Alias rejection is provided by digital filters within the A/D converters.
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