National Instruments USB Capture Devices
Example1: Transfer function between two channels using USB-6009
1. Open LabView SignalExpress
2. Select Tools>Options>Data>Maximum Clipboard Data Export Size.
Change this to a sufficiently big number, like 1,000,000.
Select Operate>Update Signal Views While Running> Update None.
(This should reduce bottleneck errors.)
3. Look for the device on the bottom pannel.
Select 'Acquire' and double-click on the device name.
4. In the middle panel, delete channels except 0 and 1.
5. Select both channels with the shift key.
Set 'Terminal Configuration' to "Differential".
6. Change the Rate to 200 Hz.
High rates can cause charge leakage.
Low rates can cause SignalExpress to experience acquisition errors.
200 Hz seems to be safe (if you don't want to measure anything above 100 Hz).
7. Hook up wires and ground.
Channels 1, 3 and 7 should go to an external ground.
Chanels 2 and 3 are connected to the signal sensor A.
Channels 5 and 6 are connected to the signal sensor B.
8. In the middle box, find 'Recording Options' and check the 'Record' box.
Near the top of the menu bar, a box should appear that says "Record While Running", which is to the right of the "Run" button.
Press "Run" to begin taking data.
Press "Stop" when you are done taking data.
9. Click on the 'Logs' folder in the lower-left corner.
Each channel should appear underneath "Voltage".
Click on each channel and a graph of the data will appear.
(This can take a few moments.)
Select Export To>Clipboard.
This data can now be pasted into WordPad for exportation to matlab or whatever.
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