Characteristic Specifications Supplemental Information
APx DIO Module for B Series: Specifications 55
DIO
Bandwidth Limiting Filters (audio signals)
High-Pass
4
DC DC coupling
AC (<10 Hz) AC coupling –3 dB at 4.1 Hz
Butterworth F
HP
(–3 dB) = 10 Hz to 100 kHz,
4-pole
Elliptic F
HP
(–0.01 dB) = 10 Hz to 100 kHz,
5-pole; 0.01 dB pass-band ripple;
–60 dB stop-band
Low-Pass
4
FS/2 No filter is implemented, bandwidth
and response are limited by the SR
Butterworth F
LP
(–3 dB) = 10 Hz to 100 kHz,
8-pole
ENBW 1.006 • F
LP
Elliptic F
LP
(–0.01 dB) = 10 Hz to 100 kHz,
8-pole; 0.01 dB pass-band ripple;
–60 dB stop-band.
ENBW (1.012–1.062) • F
LP
(varies
due to warping)
Weighting A-wt, B-wt, C-wt, CCIR-1k, CCIR-2k,
CCITT, C-message, 50 s or 75 s
de-emph (with and without A-wt), or
None
Weighting filter is cascaded with the
high-pass and low-pass bandwidth limit-
ing filters.
Input Equalization
Arbitrary 30-pole input filter The EQ operates on any selected ana-
lyzer input channels.
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
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