D/A Generated Analog Signals
Available only in the SYS-2720 and SYS-2722 configurations. Except for arbitrary
and Pass Thru waveforms, the digitally generated analog output signals and the
embedded output signals are independently selectable and concurrently available. If
both analog and digital outputs are selecting arbitrary waveform, it must be the same
one. If Pass Thru waveforms are selected for both analog and digital generators, they
must be at the same sample rate.
Common Specifications
Sample Rate
Sine, IMD signals fixed at 65.536 ks/s or 131.072 ks/s.
Other signals 8 ks/s–108 ks/s variable,
or fixed at 65.536 ks/s or 131.072 ks/s.
Frequency Accuracy ±0.0002% [2 PPM] internal reference, lockable to
external reference.
D/A Resolution 24-bit sigma-delta.
“SINE (D/A)” Signal Family
The Sine family includes “Normal,” “Var Phase,” “Stereo,” “Dual,” “Shaped Burst,”
and “EQ Sine.” Normal and EQ Sine produce a monaural signal with the best (lowest)
residual THD+N performance. EQ Sine varies the amplitude in accordance with a
selected EQ file. Var Phase produces the same sine wave in both channels but with
settable phase offset. Stereo provides sine waves of independently settable frequency in
each channel (phase is random if both frequencies are set equal). Dual produces a
monaural test signal containing a mixture of two sine waves of independently settable
frequency and amplitude ratio. Shaped Burst produces a monaural sine burst signal
with a raised cosine amplitude envelope (see Figure 60 on page 77).
Frequency Ranges 10 Hz–30 kHz (65.536 ks/s), or
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10 Hz–60 kHz (131.072 ks/s).
Frequency Resolution Sample Rate ¸ 2
23
.
[0.0078 Hz in the 30 kHz range].
Flatness (1 kHz ref)
20 Hz–20 kHz ±0.01 dB.
10 Hz–30 kHz ±0.03 dB.
30 kHz–50 kHz ±0.10 dB (typically –0.5 dB at 60 kHz).
THD+N
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(20Hz–20kHz)
30 kHz range 0.0007% [–103 dB].
60 kHz range 0.0014% [–97 dB].
Variable Phase Range –180.0 to +179.9 deg.
Dual-Sine Ratio Range 0 dB to –100 dB, usable to –138 dB.
Shaped Burst Interval 2 cycle–65536 cycles.
Shaped Burst On Time 1 to (number of interval cycles minus 1).
D/A Generated Analog Signals Chapter 6: Specifications
Getting Started with Your 2700 Series Instrument 55
7
Significant generator alias products will appear for frequency settings above 29.5 kHz in the ‘30k’ range and
53.5 kHz in the ‘60k’ range.
8
System specification measured with the 2700 series analog analyzer set for a 22 kHz measurement BW.
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