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National Instruments Corporation A-1 BNC-2140 User Manual
ASpecifications
This appendix lists the specifications of the BNC-2140 accessory. All
specifications are typical at 25° C unless otherwise noted. All specifications
are relative to measurement standards and require a 15minute warm-up
period. Specifications do not include transducer error.
Analog Input
Voltage Input
Number of channels............................... 4
Maximum input voltage
(Signal + common mode voltage).......... Each input should remain within
±42.4 V (30 Vrms) of any other
input or of AIGND
Inputs affected........................................ACH0, ACH1, ACH2, ACH3
Input coupling........................................ DC
Input capacitance1
DIFF mode
Current excitation on............... 85 pF
Current excitation off...............75 pF
SE mode
Current excitation on............... 150 pF
Current excitation off...............145 pF
Current Excitation
Level.......................................................4 mA
Accuracy................................................ ±1.31%
1 Includes the effects of the BNC-2140 with a 1 m SHC68-C68-A1 analog cable
UM.book Page 1 Tuesday, July 14, 1998 10:37 AM