What is the data for the invalid range PXI-6552

[engwei]

Hi,

Let say, I set the custom voltage for the PXI-6552

2.4V - High Level

0.6V - Low Level

Then, On channel0, I supply a signal with

sample

0           3V

1           3V

2           2V

3           0V

So, sample 0,1 is High. Sample 3 is Low.How about sample 2 ? Please advise. Thanks in advance.

[jhsdelallana · Accepted solution]

Hi Engwei,

The programmed voltages are the levels you'd have to exceed or fall below before a change of digital status is registered. This means that from your example, coming from a high-level of 3V going into 2V, the waveform analyzer would still register a logic high. The deadband is actually a means of filtering out digital noise, common with majority of digital input architecture.

Best Regards,
Joshua de la Llana
NI Applications Engineer

[engwei]

Thank you, Joshua de la Llana.

[DJ_L.]

Hey engwei,

Since you have the 655x HSDIO device, I'd also like to point you to the section in the NI Digital Waveform Generator/Analyzer Help document called "Data Interpretation". You can either search for Data Interpretation, or you can go to -> Devices -> NI 655x -> Hardware Architecture -> Channel Electronics -> Data Interpretation. In the help, you will see details about how the data gets interpreted if you are in a "High or Low" method, which reiterates what was mentioned above. There is also another method called "Valid or Invalid" that the 655x devices can use. Check out the help for more details on these methods. (Note: the 654x and 656x devices only support the high/low mode).

I hope this helps, and I hope the NI Digital Waveform Generator/Analyzer Help can provide answers to some of your other questions. Let us know if you have any further questions or concerns. Thanks, and have a great day.

Regards,

DJ L.

[engwei]

Ok, thanks.