NI 9237E Operating Instructions and Specifications
26
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CMRR
Relative to earth ground
1
(
f
in
= 0 to 60 Hz) ......................... 140 dB
Relative to EX–
(
f
in
= 0 to 1 kHz) ......................... 85 dB
SFDR (1 kHz, –60 dBFS)................. 115 dB
Total Harmonic Distortion (THD)
1 kHz, –20 dBFS ........................ –95 dB
8 kHz, –20 dBFS ........................ –95 dB
1
Measured with a balanced cable on the NI 9237E with RJ-50 and with no cable on
the NI 9237E with DSUB. Shielded cables that are not twisted-pair may be
significantly unbalanced, which can impact CMRR performance. To improve the
balance of shielded cables, NI recommends twisting together the AI+/AI– pair, the
RS+/RS– pair, and the EX+/EX– pair.