Wireless Syystem (WLS 9163)

[luis_ferreira]

luis_ferreira

Wireless Syystem (WLS 9163)

Hello Forum.

I am using the following equipment from National Instruments:
NI WLS 9163
NI 9219

I set 9163 as the NI WLS wireless system through an ad hoc network.
I and acquiring the values ​​of resistance (voltage with custom Excitation) of load cells wired in full bridge.
Everything works!

However, the acquisition rates are very low!
I can not get acquisitions with more than 2 Hz (high resolution)!

Will can help me on the following issues:
This is because the equipment I am using?
How can I change that with this equipment?
There is another wireless system from NI, with better results for this application?

I appreciate the help! 

(Not sure if this is the most suitable place, also posted in Wireless Sensor Networks)

Re : Wireless Syystem (WLS 9163)

Hello,

What kind of problem do you have if you choose to get data at a higher rate than 2Hz ?

Which version of DAQmx do you use?

Could you post a screenshot of your configuration in MAX and tell us which IDE do you use? Is it LabVIEW?

Do you have a VI to post?

Regards,

[luis_ferreira]

Hello Forum.

I am using the following equipment from National Instruments:
NI WLS 9163
NI 9219

I set 9163 as the NI WLS wireless system through an ad hoc network.
I and acquiring the values ​​of resistance (voltage with custom Excitation) of load cells wired in full bridge.
Everything works!

However, the acquisition rates are very low!
I can not get acquisitions with more than 2 Hz (high resolution)!

Will can help me on the following issues:
This is because the equipment I am using?
How can I change that with this equipment?
There is another wireless system from NI, with better results for this application?

I appreciate the help! 

(Not sure if this is the most suitable place, also posted in Wireless Sensor Networks)

[#3]

Hello,

What kind of problem do you have if you choose to get data at a higher rate than 2Hz ?

Which version of DAQmx do you use?

Could you post a screenshot of your configuration in MAX and tell us which IDE do you use? Is it LabVIEW?

Do you have a VI to post?

Regards,

[luis_ferreira]

Hello,

I am using the system NI WLS 9163 with the acquisition board 9219.

(in future I intend to use the system 9219)

I actually have a very simple VI just to test the speed of acquisition. Have the function of a scale, and only measures the strength. I then pictures:

(1 and 2)

Use the following parameters:

(3 and 4)

But in spite of acquisition board (9219) allow 100 acquisitions per secondjust I can the following rates of acquisition (continuous samples):

ADC Timing Mode	Samples To Read	Rate (Hz)
High Resolution	1	2
High Speed	1	100
Best 50 Hz Rejection	1	7
Best 60 Hz Rejection	1	9

I need a rate of 10/15 acquisitions per second. But with the high speed option, the results are very unstable.

Is possible raise the rate of acquisition in the high resolution option?

When I put a value greater than 2 Hz (high resolution) the following error appears:

5

Thanks!

[luis_ferreira]

and...

[Thoric]

Have you read this document:

http://digital.ni.com/public.nsf/allkb/1015F4182FB8A805862572D1006B4CC1

[Thoric]

The document I linked to above shows that, in High Resolution mode (which you choose in pic 5), the maximum sample rate is 510ms, or about 2Hz.

[JérémyC]

Hello,

I was about to answer the same thing as Thoric.

On page 25 of the NI 9219 Operating Instructions and Specifications, there is the same information :

So assuming that you're not using any channel in TC mode, the maximum rate at a High resolution is 1 / 0,5 = 2 Hz

Regards,

[luis_ferreira]

Ok
It all makes sense now.

I did not know this page.

Thank you, Thoric and JérémyC.

[pcnitk]

how to configure wls 9163 in windows 7.........i am not able to follow the xp steps

[luis_ferreira]

I used this:

http://www.ni.com/gettingstarted/setuphardware/dataacquisition/wireless.htm