USE USB6009 in DLTS measurement

[bonner210a]

Hi

I want to buy a NI USB6009 DAQ for DLTS measurement (To capture and digitize the transient capacitances within a few us). I don't know if this USB6009 is good enough to perform this kind of data acquisition. Is there anyone use this card for DLTS or similar measurement before? If not, what is other choices. Thanks.

[BrowningG]

Hello bonner210a,

Thanks for contacting National Instruments. 

I understand that the main function of Deep-level Transient Spectroscopy is to measure transient capacitances.  I am unclear as to how you wish to measure the capacitances.  The NI USB 6009 natively measures volts.  Page 21 of the specifications sheet for this device indicates the absolute accuracy of voltage measurements using the different available ranges for this device.  Also, using the maximum sample rate with one channel, the shortest time between samples for this device is about 21 microseconds, I am not sure if this will fast enough to capture the change produced by your unit under test. 

National Instruments has several options for data acquisition device which can be found on the NI webpage.  If you would like more detailed information regarding any products, you can contact National Instruments directly.  The technical representatives can get you in touch with Application Engineers who can help find the best solution for your needs. 

If you could go over measurement method you would like to use, it would be most beneficial.  Please post back if you have any questions. 

[bonner210a]

Hello BrowningG

Thanks for your reply. Your description do help me to know about this device better. Actually, our DLTS system will output the voltage change between two different time and so we can use DAQ to capture this voltage and convert to the capacitance change. It looks like USB 6009 is ok for this function. Also the sampleing rate is fast enough to capture the transient signal in our system. Thanks you.

[Matt@cardiff]

Hi,

I am currently working in Cardiff university doing a DLTS experiment. I also want to automate the experiment using the NI-DAQ 6009. I was just wondering if you could share any information on how you accomplished the automation. E.g.. How you used voltage measurements instead of capacitance, and we currently use boxcar averaging with our experiments, did you incorporate this or different type of 'averaging', e.g.. laplace, fft etc. in your labview program (assuming you used labview).

any help would be of great use to me and would be very much appreciated.

thanks

Matthew Parry

Cardiff University

[BrowningG]

Hello Matthew,

Welcome to the NI Discussion Forums!  I am not sure how bonner210a implemented DLTS, but there are a few things you mentioned that I might be able to help with.  If you have LabVIEW Full, Professional, or Developer Suite, you have access to a function palette for signal processing.  This palette has both an FFT and real Laplace transform VIs.  Context help and the detailed LabVIEW help give some great information on these two functions.  Post back if you have any questions. 

Message Edited by BrowningG on 08-20-2008 04:30 PM