Output 2 array elements onto excel spreadsheet

Hello all, I am fairly new to LabVIEW and need some help.
I'm trying to measure the output of a multimeter and send it on the the excel filesheet.
The scenario is like this:
I'm using 4 sequences
The mutlimeter and power supply stated below are physical power supplies using VISA session
1st Sequence
Controls the power supply and adjust the voltage to 5 volts
Obtain measurements from multimeter
2nd Sequence
Timer wait 500ms
3rd Sequence
Controls the power supply and adjust the voltage to 0 volts
Obtain measurements from multimeter
4th Sequence
Timer wait 500ms
All these sequence are wrapped around by a infinite while loop. And will stop looping once the stop button is pressed.
What I want to achieve is to store the measurements of the multimeter when 5 volts and 0 volts is supplied and store it into a spreadsheet(the same spreadsheet with both measurements). These measurement will be stored continuously untill the stop button is pressed. So I can see a list of measurements.
The problem I'm having now is that it only stores the last measurement and overwrites the old ones.
Below is a copy of my VI. Please help me out here. Thank you
Attachments:
Working_Power_Supply.vi ‏44 KB

Not having the subvi's on hand, i'm just guessing here.
There's a coupla ways to accomplish this - here's an example using a shift register and a sequence local.
2006 Ultimate LabVIEW G-eek.
Attachments:
Working_Power_Supply_2.vi ‏37 KB

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Writing two arrays to a Excel Spreadsheet

Guru's
I am trying to take information from two arrays and write them to a spreadsheet. One array generates the headers information for the columns, the other array is a random number generator. The number of columns and rows are input from the front panel. The first column of the chart is time at some multiple (interval) input from the front panel
The problem I am having is timing the data out of the loop at the same time so they write together. One loop writes first and the other is left out. The data is going out to an excel spreadsheet. The data is correct for the headers and the columns, but won't write together.
I have only been using LabView for six weeks and have spent a good portion of this weekend working on this problem.
Attached are screen shots and the .vi of the problem. Explanations of each loop are writen in the block diagram.
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Attachments:
writing to excel problem.doc ‏195 KB
Writing to excel problem.vi ‏27 KB

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Placing a text decoration over a path constant does not turn it into a valid path constant.
All your controls belong outside the loop, because it would be really bad if they could change during running of the loop. This is also less work, because LabVIEW does not need to re-inspect the control during each iteration.
Your while loop should be a FOR loop because the number of iteration can be calculated before the loop starts. This eliminates checking for termination.
You are not writing any excel files. You are just writing an ASCII table, but you possibly force excel to open it via a fake file extension. (this might be OK, but make sure to NEVER save it later as excel or the file structure would change dramatically).
"# of rows" and "# of machines" should be integers (blue).
Don't be afraid to brance a wire. You don't need any local variables if you do so.
To determine the order in which the segments are written to the file can be determined by dataflow if you wire it correctly. Wire the path to the write function that needs to write first. Then use the path output of this function and wire it to the next instance. Now the second instance must wait until the first one is finished.
(Currently you are branching the path wire, and the execution order is random!)
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> My situation is that I have an array of clusters on the front panel.
> Each element is used for a particular test setup, so if the array size
> is three, it means we have three identical test setups that can be
> used. The cluster contains two string controls and a button: 'device
> ID' string, 'start' button and 'status' string.
>
> In order to keep the diagrams simple, I would like to use a reference
> to the array as input into a subvi. This subvi will then modify a
> particular element in the array (i.e. set the 'status' string).
>
It isn't possible to get a reference to a particular element within an
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location. When the edit is completed, it is incorporated into the
display so that it is never lost.
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Output 2 array elements onto excel spreadsheet

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