Characteristic Specifications Supplemental Information
APx515 B Series Audio Analyzer: Specifications 35
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
difference 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
DFD Typically <–150 dBFS
Frequency Measurement
Range <5 Hz to 0.499 • SR
Accuracy ±(0.0003% + 100 μHz)
Resolution 6 digits
Phase Measurement
Ranges –90 to +270, ±180, or 0 to 360 deg
Accuracy
1
Typically 0.001 deg
Resolution 0.001 deg
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