Characteristic Specifications Supplemental Information
26 APx511 B Series Hearing Instrument Analyzer: Specifications
THD+N Measurement (Microphone, Speaker Voltage, Telecoil Current)
Fundamental Range 100 Hz to 20 kHz
Measurement Range 0 to 100%
Accuracy ±0.5 dB
Residual THD+N
1,2
(–80 dB + 1.4 µV), 20 kHz BW Microphone, speaker and telecoil
Level & THD+N Filters
High-Pass 5 Hz to 500 Hz, or None 1 Hz steps
Low-Pass
4
2.7 kHz to 90 kHz, or None 100 Hz steps; very sharp roll-off charac-
teristic exceeds AES-17
Weighting A-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 the
high-pass and low-pass bandwidth limit-
ing filters
IMD Measurement
Test Signal Compatibility
SMPTE & MOD Any combination of 40 Hz–1 kHz (LF)
and 240 Hz–21.6 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–21.56 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
IEC60268
DFD d2, d3, d2+d3, or d2+d3+d4+d5 Use “d2+d3” for measurements per
IEC60268
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
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