Specifications

Characteristic Specifications Supplemental Information
14 APx511 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 100 Hz–1 kHz
(LF) and 2 kHz–10 kHz (HF), mixed in
any ratio from 1:1 to 10:1 (LF:HF)
HF tone must be  6 • LF tone.
DFD Any two-tone combination with mean
frequency of 2.5 kHz–10 kHz and a
difference frequency of 100 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 typ. 40–500 Hz.
MOD d2, d3, d2+d3, or d2+d3+d4+d5 Use “d2+d3” for meas. per IEC 60268
DFD d2, d3, d2+d3, or d2+d3+d4+d5 Use “d2+d3” for meas. per IEC 60268
Measurement Range 0 to 20%
Accuracy ±0.5 dB
Residual IMD
1,2,3
(Speaker to Microphone, Speaker Voltage, Telecoil Current)
SMPTE & MOD ≤–80 dB [0.01 %], 4:1 mix ratio
DFD ≤–80 dB [0.010 %]