National Instruments BNC -2140 - Manual (Page 22)

© National Instruments Corporation A-1 BNC-2140 User Manual
A
Specifications
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 15 minute 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 V
rms
) of any other
input or of AIGND
Inputs affected........................................ ACH0, ACH1, ACH2, ACH3
Input coupling ........................................ DC
Input capacitance 1
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 ................................................ ±1.015%
1 Includes the effects of the BNC-2140 with a 1 m SHC68-C68-A1 analog cable