Characteristic Specifications Supplemental Information
34 APx515 B Series Audio Analyzer: Specifications
THD+N Measurement
Fundamental Range 5 Hz to 0.49 • SR or 50 kHz,
whichever is lower
Tuning can be set to track measured fre-
quency, generator setting or fixed
Measurement Range 0 to 100%
Accuracy ±0.5 dB Q=2.6 typically
Residual THD+N
1, 7
Typically <–140 dBFS
Bandwidth Limiting Filters
High-Pass
8
DC DC coupling
AC (< 10 Hz) AC coupling –3 dB at 4.1 Hz
Butterworth F
HP
(–3 dB) = 10 Hz to 100 kHz,
4-pole
Elliptic F
HP
(–0.01 dB) = 10 Hz to 100 kHz;
5-pole; 0.01 dB pass-band ripple;
≤–60 dB stop-band
Low-Pass
8
FS/2 No filter is implemented, bandwidth
and response are limited by the SR
Butterworth F
LP
(–3 dB) = 10 Hz to 100 kHz,
8-pole
ENBW ≈ 1.006 • F
LP
Elliptic F
LP
(–0.01 dB) = 10 Hz to 100 kHz,
8-pole; 0.01 dB pass-band ripple;
≤–60 dB stop-band
ENBW ≈ (1.012–1.062) • F
LP
(varies
due to warping)
Weighting A-wt, B-wt, C-wt, CCIR-1k, CCIR-2k,
CCITT, C-message, 50 μs or 75 μs
de-emph (with and without A-wt), or
None
Weighting filter is cascaded with both
high-pass and low-pass bandwidth
limiting filters
Input Equalization
Arbitrary 30-pole input filter The EQ operates on any selected ana-
lyzer input channels.
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