APx515 B Series Audio Analyzer: Analog I/O Specifications 55
515
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 analyzer input channels.
IMD Measurement
Test Signal Compatibility
SMPTE & MOD Any combination of 40 Hz–1 kHz (LF)
and 240 Hz–60 kHz (HF), mixed in any
ratio from 1:1 to 10:1 (LF:HF)
LF tone must be 1/6 • HF tone.
DFD & CCIF Any two-tone combination with mean
frequency of 250 kHz–60 kHz and a dif-
ference frequency of 80 Hz–2.0 kHz
F
mean
= (F1 + F2)/2
F
diff
= |F2 - F1|
F
mean
must be 6 • F
diff
IMD Measured
SMPTE Amplitude modulation of HF tone. Measurement BW is ≈40–750 Hz.
MOD d2, d3, d2+d3, or d2+d3+d4+d5 Use “d2+d3” for measurements per
IEC-60268.
DFD d2, d3, d2+d3, or d2+d3+d4+d5 Use “d2+d3” for measurements per
IEC-60268
CCIF d2 only “CCIF” is an archaic form of DFD that
measures only the d2 product. CCIF
uses a different 0 dB reference giving
readings 2x higher than DFD.
Measurement Range 0 to 20%
Accuracy ±0.5 dB
Residual IMD
1, 7
SMPTE & MOD Typically <–140 dBFS
Characteristic Specifications Supplemental Information
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