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Characteristic
THD+N Measurement
Fundamental Range
Measurement Range
Accuracy
1, 7
Residual THD+N
Bandwidth Limiting Filters
8
High-Pass
DC
AC (< 10 Hz)
Butterworth
Elliptic
8
Low-Pass
FS/2
Butterworth
Elliptic
Weighting
Input Equalization
Specifications
5 Hz to 0.49 • SR or 50 kHz,
whichever is lower
0 to 100%
±0.5 dB
DC coupling
AC coupling
F
(–3 dB) = 10 Hz to 100 kHz,
HP
4-pole
F
(–0.01 dB) = 10 Hz to 100 kHz;
HP
5-pole; 0.01 dB pass-band ripple;
≤–60 dB stop-band
No filter is implemented, bandwidth
and response are limited by the SR
F
(–3 dB) = 10 Hz to 100 kHz,
LP
8-pole
F
(–0.01 dB) = 10 Hz to 100 kHz,
LP
8-pole; 0.01 dB pass-band ripple;
≤–60 dB stop-band
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
Arbitrary 30-pole input filter
APx515 B Series Audio Analyzer: Specifications
Supplemental Information
Tuning can be set to track measured fre-
quency, generator setting or fixed
Q=2.6 typically
Typically <–140 dBFS
–3 dB at 4.1 Hz
ENBW ≈ 1.006 • F
LP
ENBW ≈ (1.012–1.062) • F
(varies
LP
due to warping)
Weighting filter is cascaded with both
high-pass and low-pass bandwidth
limiting filters
The EQ operates on any selected ana-
lyzer input channels.
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