Справочник Пользователя для National Instruments SCXI -1122

Table 2-2.  Jumper W1 Settings

Grounding,

shielding, and

reference mode

selection

Unconnected position (factory setting)

 

W1

B

A

R0 R1 R2

Connects the analog reference to the
analog output ground AOGND (pins 1
and 2 on the rear signal connector).
Select this configuration if you are
using an RSE DAQ board.  Do not use
a differential input DAQ board when
jumper W1 is in this position.

 

B

A

R0 R1 R2

W1

Connects SCXIbus guard to the analog
reference

 

B

A

R0 R1 R2

W1

W1

Enables the pseudodifferential
reference mode and connects the
analog reference to the OUTREF pin
on the rear signal connector.  Select
this mode when the SCXI-1122 has to
operate with DAQ boards that have a
nonreferenced single-ended (NRSE)
input.  Do not use differential input
DAQ boards when jumper W1 is in
this position.

 

B

A

R0 R1 R2

W1

The SCXI-1122 has pads for transforming individual channels to current-to-voltage converters.
National Instruments offers an SCXI process current pack, which consists of a package of four
249 

Ω

, 0.1%, 5 ppm, 1/4 W resistors.  You can find the part number for this kit in the Optional

Equipment section of Chapter 1, Introduction.  Table 2-3 shows the input channel and its
corresponding resistor reference designator.

Table 2-3.  User-Defined Current Receiver Resistors

0

R1

1

R2

2

R3

3

R4

(continues)