Audio Precision AP 517, Installation Instructions Manual

Page: 47 / 92

Characteristic Specifications Supplemental Information
APx517 B Series Acoustic Analyzer: Specifications 45
IMD Measurement
Test Signal Compatibility
SMPTE & MOD Any combination of 40 Hz - 1 kHz
(LF)
and 240 Hz-60 kHz (HF) tones,
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 Hz-60 kHz and a
difference frequency of 80 Hz-2.0
kHz
Fmean = (F1 + F2)/2; Fdiff = |F2 - F1|
Fmean must be ≥ 6*Fdiff
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 {notes 1,2,3}
SMPTE & MOD ≤ -90 dB [0.0032%], 4:1 mix ratio
DFD ≤ -100 dB [0.0010%]