Characteristic Specifications Supplemental Information
56 APx DIO Module for B Series: Specifications
DIO
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
2
SMPTE & MOD Typically < –140 dBFS
DFD Typically < –150 dBFS
Frequency Measurement
Range < 5 Hz to 0.499 • SR
Accuracy ±(0.0003% + 100 µHz)
Phase Measurement
Ranges –90 to +270, ±180, or 0 to 360 deg
Accuracy Typically < 0.001 deg
NOTES to SPECIFICATIONS:
1 Sample rate (SR) must be 27 kS/s for specified performance. Jitter analyzer set for 700 Hz high-pass response
per AES3-1992.
2 Digital generator word width must be set to 24 bits for specified performance; shorter word widths may degrade per-
formance.
3 Maximum low-pass filter frequency is limited by input sample rate (SR).
4 DSP warping may significantly increase roll-off rate and lower ENBW.
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