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© National Instruments Corporation B-1 SCXI-1190/1191/1192User Manual
B
Common Questions
This appendix addresses common questions you may have while using
your SCXI-119X switching 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 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.
One of my modules doesn’t switch properly anymore. What’swrong?
One of the relays may have worn out. Relays are mechanical devices and
have a limited switching lifetime. Call National Instruments for
information on replacing your relays.