Characteristic Specifications Supplemental Information
22 APx525/526 B Series Audio Analyzers: Analog I/O Specifications
525
Level (Amplitude) Measurement
Range
Balanced or bridging input < 1 µV to 300 Vrms
Unbalanced input < 1 µV to 160 Vrms
Accuracy (1 kHz)
+15C to +30C ±0.03 dB [±0.35%]
0C to +45C ±0.05 dB [±0.58%]
Flatness (1 kHz ref, DC coupling)
10 Hz to 20 kHz ±0.008 dB Typically < 0.003 dB
20 kHz to 50 kHz ±0.030 dB
50 kHz to 80 kHz ±0.10 dB
80 kHz to 250 kHz (requires
option BW52)
±0.20 dB Roll-off is typically <–3 dB at the
selected input BW setting, 1 MHz max
Residual Noise (inputs shorted)
20–20 kHz BW
5
1.3 µVrms Typically <8.0 nV / Hz at 1 kHz.
20–500 kHz, with option BW52 8.0 µVrms
THD+N Measurement
Fundamental Range 5 Hz to 90 kHz
Measurement Range 0 to 100%
Accuracy ±0.5 dB Q=2.6 typically
Residual THD+N
1,2
20 Hz–20 kHz fundamentals (–105 dB + 1.3 µV, 20 kHz BW);
(–100 dB + 1.8 µV, 40 kHz BW);
(–92 dB + 2.6 µV, 80 kHz BW);
(–85 dB + 6 V), 250 kHz BW;
(–82 dB + 9 V), 500 kHz BW
Typically <–110 dB at 1 kHz, 2.5 V with
option AG52; typically <–108 dB in stan-
dard units.
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