Shaker control with output from load cell

Hi
I am using a (analog output) shaker to generate sinusoidal forces at different frequency and of different magnitude. I am also using a load cell (analog input) to sense these forces . The max force generated by shaker decreases as I increase the frequency of vibration. Whereas, the experiment requires the force to be constant when the frequency is changing. I plan to use the max force obtained from the load cell data, as the process parameter, to modify the amplitude of input wave which excites the shaker. I seek help in this regard. I am using PCI6221 and SCC68.
Thanks in advance.
RSD

Sorry, I have been extremely busy the last couple of days (months?). I still haven't had much time to ponder the problem, but one thought comes to mind, at what frequencies are you running this and what is the load cell, and its supporting electronics, frequency response. You mention that the amplitude decreases as the frequency increases, but that you increase the gain of the driver amplifier. It (the system) is most likely non-linear in its response, so how much you increase the gain will vary. The nonlinearity of the response is one of the reasons there is so much published about control systems, PID controllers, etc.
Putnam
Certified LabVIEW Developer
Senior Test Engineer
Currently using LV 6.1-LabVIEW 2012, RT8.5
LabVIEW Champion

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98 : <cfheader name="Content-Disposition" value='inline;
filename=#URLEncodedFormat("FundingRequest.pdf")#'>
99 : <cfcontent reset="yes" variable="#pdfOut#"
type="application/pdf">
100 : </cfif>
Is this a bug or am I doing something wrong?

I am experiencing this same issue in our ECC 6.0 system. We currently have ST-A/PI release 01M_ECC600 level 0001 applied to our system. These jobs finish successfully in SM37, but I'm seeing the same error messages in our system logs (SM21).
When I try to update the output device that is associated with these jobs, the user ID running the jobs is not valid since it's user type is Communication Data.
Does anyone know if it ok to change the user for this job? Should it be run by DDIC? I believe the jobs were created automatically when we applied ST-A/PI release 01M_ECC600 level 0001.

ICloud out of control with contacts from wifes iphone... help

I am going to explain this situation as simple as I can... I searched a bit before I am posting this and found nothing of help...
Me- Bought a MacBook Pro for myself last year, and the wife took it over before I could use it.
Her- Has Itunes account, but before I understood Itunes, has synced on my Dell (I know I know) and maybe even that Macbook
Me- Ordered her own Macbook Pro (be here August 6), and am taking back my Macbook! Yeay!
So two night ago since I am parking the Dell, I am fully converting this month. Anyway, this morning she called me and the caller id was not her name, but "my cell number".... strange. Well, my Mac bro had me log into my Icloud online and sure enough, my wifes iphone is there. I have her contacts mixed in with mine.
Her- When she got home today, I looked onto her Iphone, and in her Icloud it did in fact have HER itunes login.
How do
A- I get her contacts out of my phone?
B- Get her Phone off my icloud? Her Icloud shows her as logged in with her ID.
If this helps, her Iphone is my old 4 when I got the 4s.

I sure hope you get an answer because this has happened to me as well...only worse.
My contacts were merged with my 13 year old daughters and she proceeded to delete all of my contacts. I added what contacts I could remember and deleted hers off of my phone which now are deleted off of her phone as well (funny right).
I only use one apple ID and use this to log into icloud.
I only logged the kids' phones onto icloud so I could install "find my iphone"...now I wish they would just get lost.
Is there any way to retreive the lost contacts?
What do I need to do so we don't keep adding and deleting each other's contacts?
Any help would be appreciated.

Ever since the last upgrade, when I tap a cell to highlight it or add text a box pops up with text from other cells. How do I disable this feature?

How can I disable a pop up box that appears whenever I tap a cell in numbers for ios? This annoying feature accompanied the last upgrade. When I tap a cell to highlight it, a box pops up with all the words typed in the adjacent cells so I can populate the cell with one of them, but I neither need nor want the suggestions.

Hi debdor,
I don't know where to find the setting in Numbers for iOS, but in Numbers for Mac OS X it is under Menu > Numbers > Preferences > General > Editing.
Show suggestions when editing table cells.
As you can see, I don't use it.
Regards,
Ian.

NI 9219 with load cell

Hello,
I am using the NI 9219 with a Futek Load Cell whose specifications are as follows:
Name
Min
Typ
Max
Unit
Channel: 1
Compensated Temperature
60
160
F
Excitation
1
20
Vdc
Hysteresis
-.25
.25
% of R.O.
Input Resistance
744
Ohms nom.
Insulation Resistance
500
Mohms @ 50 Vdc
Nonlinearity
-.25
.25
% of R.O.
Nonrepeatability
-.05
.05
% of R.O.
Operating Temperature
-60
200
F
Output Resistance
700
Ohms nom.
Safe Overload
150
% of R.O.
Temperature Shift Span
-.01
.01
% of Load/F
Temperature Shift Zero
-.01
.01
% of R.O./F
Zero Balance
-1
1
% of R.O.
Capacity
500
lbs
Rated Output
2
mV/V nom.
Calibration Excitation
10
Vdc
I am getting a signal from my load cell which is great, but I was wondering how you can adjust the signal output to have minimal interference from noise, vibrations, etc. and how to program the load cell that it can be calibrated to zero (0) before any data is aquired?
Any help is greatly appreciated!
Thanks,
Yatsco

Hello Yatsco,
Thank you for using NI forums. One thing you will probably want to look into is using the filtering VI's in LabVIEW. A low-pass filter can help to eliminate any high frequency noise from your measurement. Also, take a look at the Field Wiring and Noise Considerations article for some more information on eliminating noise. Lastly, this community example shows how you could calculate the DC offset and compensate for it before measuring your signal. Please let me know if you have any additional questions concerning this application.
Regards,

Shaker control with output from load cell

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