© National Instruments Corporation B-1 SCXI-1190/1191 User Manual
B
Common Questions
This appendix addresses common questions you may have while using
your SCXI-119X multiplexer module.
The SCXI-1190 is listed to have a 1.3 GHz bandwidth. Can I use it at
2 GHz bandwidth?
The SCXI-1190 can definitely be used at 2 GHz, as long as the isolation,
VSWR, and attenuation levels are acceptable for your particular
application. Refer to Appendix A, Specifications, for a complete list of the
parameters at 2 GHz.
What should I do if the software detects the module but the switches do
not switch?
• Verify that the switches do not switch by trying to close and open the
switches. You can verify the switches’ functionality by using the
NI-SWITCH front panel. Access the front panel by clicking on
Start»Programs»National Instruments Switch»NI-Switch Soft
Front Panel.
• Also be sure to check the return codes of the NI-SWITCH operation to
ensure that there are no errors (negative value) or warnings (positive
value).
• Finally, verify that your code is correct. For reference, see the
examples described in the NI-SWITCH Software User Manual.
The NI-SWITCH driver ships with several examples in source code.
Compare your algorithm to those in the examples.
Do I need to program the switch module myself?
The SCXI-119X comes with the NI-SWITCH driver software, which
exports the full functionality of the module. NI-SWITCH handles the
complex issues of direct memory access, interrupts, and operating system
interfacing for you. All you need to do is make high-level calls to these
functions from your ADE.
