National Instruments 1128 用户手册

In a matrix configuration, you can expand the columns of the matrix using 
the HVAB-backplane adapter. For example, you can connect two 
SCXI-1127/1128 modules via the HVAB-backplane adapter to create a 
4

× 16 matrix. You can also expand the rows and columns of a matrix 

through the front connector of the SCXI-1127/1128 using the SCXI-1332 
and matrix expansion cables. Refer to Chapter 2, 

, for 

further information on matrix expansion.

The SCXI-1127/1128 is designed to work well at both low and high 
voltages. For low-voltage measurements such as those taken with 
thermocouples, the SCXI-1127/1128 uses relays with very low thermal 
offset to ensure accurate measurements. At high voltages, the SCXI-1127 
can handle signals up to 250 V

rms

 at a 200 mA load and 30 VDC at a 1 A 

load. The SCXI-1128 can handle signals up to 250 V

rms

 at a 0.8 mA load 

and 30 VDC at a 10 mA load. The SCXI-1127/1128 complies with the CE 
low-voltage directive for an installation category II environment. Refer to 
Appendix A, 

, for detailed specifications of the 

SCXI-1127/1128.

The following section explains how to install the software required to 
use the SCXI-1127/1128, including installing the latest version of 
NI-SWITCH. After installing the software, install the SCXI-1127/1128 
hardware and its accessories, then configure and test the SCXI-1127/1128.

You can control the SCXI-1127/1128 programmatically in an application 
development environment (ADE) using NI-SWITCH. The supported 
ADEs include LabVIEW, Measurement Studio, Visual Basic, and C or 
C++ environments. To install software for the SCXI-1129, complete the 
following:

1.

Insert your NI-SWITCH software CD into your CD-ROM drive.

2.

Click the Install NI-SWITCH option from the installation window 
that appears automatically.

If the installation window does not appear, double-click the My Computer icon on 

your PC desktop. Find the CD drive, and double-click it. In the CD directory, double-click 

install.exe

.