National Instruments 321906B-01 用户手册

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 National Instruments Corporation

A-1

This appendix lists the specifications for the NI 2501 and NI 2503 
switch cards. These specifications are typical at 25

°

 C unless otherwise 

noted.

Number of Channels .............................. 24

Maximum Working Voltage

.................. ±

 10 VDC from chassis ground

Overvoltage Protection

Signals CH<0..23>, COM<0..3>

Powered on or off

.................... ± 25

 VDC

Signals AB<0..1>

Powered on

.............................. ±

 25 VDC

Powered off

.............................. ± 15

 VDC

FET Switch On Resistance

Typical

............................................ 50 Ω

Max @ 25

°

 C

.................................. 85 Ω

Max @ 85

°

 C

.................................. 100 Ω

Total Signal Path Resistance (Channel x to Analog Bus x)

Typical

............................................ 1650 Ω

Maximum

........................................ 1900 Ω

Total Signal Path Resistance (Channel x to Common x)

Typical

............................................ 1900 Ω

Maximum

........................................ 2150 Ω