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N8731A superconductive load

Question asked by mikhail001 on Aug 29, 2012
Latest reply on Aug 5, 2015 by maxinef

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Hello,
I'm going to use N8731A power supply with superconductive load, so the load resistance is almost zero and the load inductance is relatively high (0.01 - 3 mH). Are there any recommendation regarding additional equipment (filters, additional resistors etc.) which I might need?

Thanks in advance,
Mikhail

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PeterW Aug 29, 2012 9:36 AM
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Hello Mikhail,

What level of current will be required by the inductance?
How do you anticipate bringing the L on and off line?
The N8731A will likely not have the current sinking ability to bring down the L. Answers to the previous questions will aid in recommendations.

Regards,

PeterW
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- mikhail001 @ PeterW on Sep 1, 2012 10:23 AM
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  Hello PeterW,
  
  Thanks for your reply, I'm going to slowly (t ~ 1 min) increase current from zero to 100 amps and then slowly decrease it again to zero. I've already added a flyback diode to the output circuit, but with low currents (up to 20 A) I observe strange voltage fluctuation on the coil, so it is impossible to measure the coil voltage drop. Yet I have no idea, what is causing that fluctuation, tried with different measuring equipment and it still persist, with short sample (L=0) of superconductor wire I have no such problems, perhaps i need to use some kind of filter.
  
  Regards,
  Mikhail
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rodel369 Jul 29, 2015 8:14 PM
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Hi! Does anyone know what is the problem of this unit? it says LFP on dispaly and could not do anything? Does anyone have the Service Manual for this?

Best Regards
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- maxinef @ rodel369 on Aug 5, 2015 11:18 AM
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  LFP stands for Locked Front Panel. In this mode, the voltage and current knobs, the OCP/488 button, and the OUT ON button are disabled. You can return to Unlocked Front Panel mode (UFP) by pressing and holding the LIMIT button, and release when the display reads UFP.
  
  There is no service manual, however the user's guide is available on the Keysight website. In the search bar at the top, enter in the model number of the unit that you are using. Click on the instrument page and there should be a tab for instrument documentation. For your case, here is the user's guide: N5700_Users_Guide.
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N8731A superconductive load

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