PXI-5661

[badas]

Hi.

I'm testing the PXI-5661 & there sum question

1) How Can to Perform Modulation Measurement with the device, an Example will help.  

2) How to set the video bandwidth?

3) Frequency measurements –

·        Is there especial 'VI' that measuring freq?

·        what is the accuracy formula of the measured freq?

[jaced]

Hi David,

I believe I can help to answer your questions:

1.      We do offer the Modulation Toolkit which seems to be the tool that you are requesting. Examples do ship with the RFSA driver and can be found at Start>>All Programs>>National Instruments>>NI-RFSA>>Examples. I suggest taking a look at the demo panel.

2.      Video bandwidth is a specification associated with the CRT displays of older spectrum analyzers. We are a digital FFT based vector signal analyzer without a CRT display so video bandwidth is a spec that doesn't directly translate. Spectrum averaging is equivalent in the sense that it smoothes the display.

3.      There are basic measurements performed in the example programs I mentioned earlier, however if more detailed analysis is needed you may consider the spectral measurements toolkit. With regard to the accuracy the specifications document contains this information. Page 2/39 begins the frequency characteristics of your device.

I hope this helps clear things up!