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NI 655x PXI
VivienW
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03-26-2006 09:41 PM
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Hi,
I came to know of the NI 6552 PXI- Programmable Voltage Digital Stimulus-Response Instrument. I am very excited and interested on this device card to implement open short (continuity) testing on a DUT.
I've read through the white paper at: http://zone.ni.com/devzone/conceptd.nsf/webmain/15de80989fd122188625704d007885ea, i'd like to know a few things:
1. Is it possible to program current on this device?
2. Is yes to Q1, what is the programmable current range?
3. I understand the FPGA is a Virtex Xilinx, what other components are used? What type of comparators and variable voltage drivers that are used? What are the specs for this component?
Thanks
Regards
VivienW
VivienW
Ryan_M
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03-27-2006 08:28 AM
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Vivien,
Thanks for your interest in the NI 655x.
The output structure of the 655x is voltage based. That is, the drivers drive out different voltages for a logic HIGH and a logic LOW. The current output from the device will be a function of that voltage but will also be dependent on whatever load it is driving. V / R = I but remember that the R is the total load resistance so it will be your load PLUS the nominal output impedance of the 655x of 50ohms. If you have control over the load then you could mimic the behavior of a current source but the actual behavior of the device is voltage driven with a series termination (50ohm).
The voltage settings have a resolution of 10mV and an accuracy of 20mV (into 1Mohm load). If you were to mimic the current source then the accuracy of the current would be affected by the 50ohm source series impedance.
For the full set of specifications for the 655x I would direct you to http://www.ni.com/pdf/manuals/373309c.pdf . The specifications in this document will be the specs that we are able to test for and guarantee. If you have any questions on some of the specs please let us know.
Thanks for your interest in the NI 655x.
The output structure of the 655x is voltage based. That is, the drivers drive out different voltages for a logic HIGH and a logic LOW. The current output from the device will be a function of that voltage but will also be dependent on whatever load it is driving. V / R = I but remember that the R is the total load resistance so it will be your load PLUS the nominal output impedance of the 655x of 50ohms. If you have control over the load then you could mimic the behavior of a current source but the actual behavior of the device is voltage driven with a series termination (50ohm).
The voltage settings have a resolution of 10mV and an accuracy of 20mV (into 1Mohm load). If you were to mimic the current source then the accuracy of the current would be affected by the 50ohm source series impedance.
For the full set of specifications for the 655x I would direct you to http://www.ni.com/pdf/manuals/373309c.pdf . The specifications in this document will be the specs that we are able to test for and guarantee. If you have any questions on some of the specs please let us know.
