Publicidad
30
Characteristic
IMD Measurement
Test Signal Compatibility
SMPTE & MOD
DFD & CCIF
IMD Measured
SMPTE
MOD
DFD
CCIF
Measurement Range
Accuracy
1,2,3
Residual IMD
SMPTE & MOD
DFD
Frequency Measurement
Range
Accuracy
Resolution
Phase Measurement
Ranges
Accuracy
Resolution
Specifications
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)
Any two-tone combination with mean
frequency of 250 kHz–60 kHz and a
difference frequency of 80 Hz–2.0 kHz
Amplitude modulation of HF tone.
d2, d3, d2+d3, or d2+d3+d4+d5
d2, d3, d2+d3, or d2+d3+d4+d5
d2 only
0 to 20%
±0.5 dB
≤-92 dB [0.0025%], 4:1 mix ratio
≤-100 dB [0.0010%]
5 Hz to 90 kHz
±0.0003% [3 ppm]
6 digits
–90 to +270, ±180, or 0 to 360 deg
±0.2 deg, 5 Hz to 5 kHz;
±0.8 deg, 5 kHz to 20 kHz;
±2.0 deg, 20 kHz to 50 kHz
0.001 deg
APx515 B Series Audio Analyzer: Specifications
Supplemental Information
LF tone must be 1/6 • HF tone.
F
= (F1 + F2)/2.
mean
F
= |F2 - F1|
diff
F
must be ≥6 • F
mean
diff
Measurement BW is typ. 40–750 Hz.
Use "d2+d3" for measurements per
IEC 60268
Use "d2+d3" for measurements per
IEC 60268
"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.
must be 5 mV.
V
in
must be 5 mV with dc coupling,
V
in
both channels. Accuracy degrades
below 50 Hz with ac coupling.
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