synchronise accelerometer data with rotation speed by using NI4472

[Suraaa]

Dear All,

In my application i want to get vibration data with respect to each pulse of rotational speed signal(From Speed sensor - encoder), Iam using NI 4472 PCI card. Is there any way to synchronise this rotation speed signal with respect to vibration data...

Reagrds,

Vijay

[NEWKlear]

Vijay,

What are you currently using to measure the encoder?  Is it an analog or digital encoder? Are there any other cards in your system?

There are many ways to synchronize these measurements, however depending on your setup we will be better able to recommend a solution for you.

Best Regards,

[Suraaa]

Dear Mr J Newk,

From encoder iam getting digital 5V pulse, SO i want to synchronise vibration data with this encoder pulse signal. Each encoder pulse i need one data of vibration(Connected in AI signal). No ther NI PCI card in my PC, I have only NI PCI 4472.

Is there any way to connect this Encoder digital signal to NI PCI 4472 ???..

Pls guide me how to synchronise this digital pulse and vibration data(Analog signal) in NI PCI 4472..

Regards,

Vijay

[NEWKlear]

Hi Vijay,

It is possible to import a digital tach signal into your 4472, however this card was not designed for tachometer readings and it will take a siginificant amount of post processing to convert the digital signal to encoder position measurements.

This white paper is a pretty good overview of encoder measurement systems: http://www.ni.com/white-paper/7109/en/ as you can see generally we use counters to perform encoder measurements, the 4472 is designed specifically for analog input and as such does not have counters onboard.

To use this card you will essentially have to have software decode this signal from the analog reading to position.

Alternatively, using a Multifunction DAQ device and a RTSI cable, you can utilize the built in functionality of the boards to take the encoder measurement and share a sample clock between the two devices using the RTSI cable, which will allow the analog input and encoder readings to be taken at the same time.

If your PC has open PCIe slots I suggest this board: http://sine.ni.com/nips/cds/view/p/lang/en/nid/207404 

and a RTSI cable http://sine.ni.com/nips/cds/view/p/lang/en/nid/12631

You will then be able to use this guide here: https://www.ni.com/gettingstarted/setuphardware/dataacquisition/quadratureencoders.htm to setup the encoder measurements.

I hope that helps,