Characteristic Specifications Supplemental Information
40 APx555 B Series Audio Analyzer: Analog I/O Specifications
555
Flatness (1 kHz ref, no filters)
20 Hz to 20 kHz ±0.008 dB; ±0.020 dB above 5 kHz in
the 20 V to 320 V input ranges
10 Hz to 50 kHz ±0.030 dB
50 kHz to 100 kHz ±0.080 dB
100 kHz to 300 kHz ±0.20 dB
Residual Noise (R
s
40 Ω)
22 kHz BW 1.0 µVrms [–117.8 dBu] Typically <6.2 nV / Hz at 1 kHz
80 kHz BW 2.0 µVrms [–111.8 dBu]
250 kHz BW 8.0 µVrms [–99.7 dBu]
500 kHz BW 10.3 µVrms [–97.5 dBu]
THD/THD+N/SINAD Measurement
Fundamental Range (F
o
) 10 Hz to 200 kHz Usable down to 5 Hz with degraded
accuracy (typ ±1.0 dB)
Tuning Control Generator tracking,
Input tracking, or
Fixed (directly entered value)
Signal must be 100 Vrms for input
tracking; F
o
must be within ±0.5% of
the entered value for fixed tuning.
Measurement Range 0 to 100% [0 dB]
Measurement Technique
High Perf Sine Analyzer ON Signals are passed through analog
notch filters to minimize the distortion
contribution from the A/D converters.
If distortion exceeds about 5–6%, the
analog notch filters are automatically
bypassed.
High Perf Sine Analyzer OFF Signals are passed directly to the A/D
converters with no analog filtering.
Projects created using other APx analyz-
ers will load with the HPSA OFF.
Accuracy
Harmonics to 100 kHz ±0.3 dB
Harmonics to 300 kHz ±0.5 dB
Harmonics to 1 MHz Typically +0.5 to –1.0 dB
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