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All ThreadsAll ThreadsTechnical Suppo...Technical Suppo...Technical Suppo...Technical Suppo...AT3600 LSBX test compensationAT3600 LSBX test compensation

 AT3600 LSBX test compensation

Thread # 16125
Status: Resolved
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20-Aug-2015 6:54 PM
alvin huang
Product : AT3600Serial Number : N/AFirmware : N/ASoftware : N/A
Question : Hello Tim, A customer have problem of AT3600 LSBX test. Inductance value is 56nH without DC bias, AT3600 can perform well. When apply 80A DC bias, nominal value should be around 51nH, AT3600 LSBX test will get a negative result. Signal used 0.1V@100kHz. Before run LSBX test, Customer passed compensate the fixture with DC1000 connected, what strange is just after compensated, measure a short circuit products will get a negative result. Questions are: 1, it mostly like caused by leads of fixture, is that possible also caused by AT3600 calibration? 2, What's the recommend signal for 50nH inductance? on user manual, no recommend signal for such low value. 3, What's your further suggestions on this problem? 4, a related problem is DC1000 output current. customer tried 200A bias, 8 sets DC1000 should be ok. however customer find 8 sets DC1000 can't generate 200A, will show error. Up to 10 sets DC1000 then can work well. I guess this caused by DC resistance of the bias current loop circuit, because DC1000 limited output voltage at 5V. if the DC resistance is high enough, then DC1000 can't generate 25A. Is this correct? is there any other cause of this problem? Thank you very much! Regards Alvin Huang
 
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21-Aug-2015 6:34 AM
Richard Riddle
Dear Alvin

Tims on holiday for a week, but i will try to help you.

I doubt its calibration ,but you could prove this by doing a simple LS test as same signal and check this gets a good result.

(i asssume the unit has latest firmware and passes self test?)
Also, please note that the OC and SC compensation should be done WITH the DC1000 connected to the fixture, and OUTPUT ENABLED (but with DC=0.00)
As its such a high frequency, check Earths on the AT and DC1000 too are good.
Hope this helps; let me know how you get on.

thanks Rich
 
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23-Aug-2015 11:09 PM
alvin huang
Dear Richard,

Thank you for help.
LS test at same signal works well.
OC and SC compensation performed and passed at the LSBX test.
however after compensation, measure the short circuit part, will get a significant negative results, normally this result should be very small, close to 0.
It looks like the compensation process doesn't work?
Is that more likely cause by the DC1000 HW is not latest? without output choke? Or DC1000 has additional 0.4A output when set 0.

It's possible caused by AT3600 or DC1000 faulty, but I need find out more accurate information, otherwise after get customer units serviced, problem still there will be a trouble.

Maybe get a sample ship to UK is a good choise.

Thank you!
Alvin Huang
 
New Post
24-Aug-2015 12:36 AM
Richard Riddle
Alvin,
As you suggest you could check the real output of the DC1000 at 0.0 A by asking the customer to measure it using a DMM on current; a normal handheld should be good enough for this purpose.

Can you attach a copy of the customers test program (ATP or PDF) too please? your description of the test is good, but it may help to get the real test program (and maybe set of results)
Thanks
RIch
 
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