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switch for resistivity measurement with model 6221/2182

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Maxime5
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Joined: April 15th, 2015, 4:24 pm
Country: United States

switch for resistivity measurement with model 6221/2182

Post by Maxime5 » April 15th, 2015, 4:42 pm

Hi,

we use a Model 6221 AC and DC Current Source with a Model 2182A Nanovoltmeter to measure small resistances (mOhm) with low current (1 microA to 10 mA) at low temperature in a 4-wire configuration and with very low noise (typically < 10nV when integrating over 5 NPLC).

Is there a switch compatible with this system that could provide around ten 4-wire channels, so that we can measure ten samples at a time, but without degrading the sensitivity of the measurements ? Also is there a compatible 4x4 matrix (for van der Pauw or Hall effect) ?

It would be better if it's fast, like <100 msecs to switch from one channel to the next.

Best regards,
Maxime

brian.d.smith
Keithley Applications
Keithley Applications
Posts: 402
Joined: June 10th, 2013, 6:00 am
Country: United States

Re: switch for resistivity measurement with model 6221/2182

Post by brian.d.smith » April 15th, 2015, 6:18 pm

We have a Hall Effect card model 7065 that goes into a model 7001 switch frame. It has nanovolt preamplifiers. If you use this card, be sure to purchase 6172 adapters to convert 2-lug triax to 3-lug.

The 7168 can scan 8 channels of nanovolt signals. These are 2-wire channels. You would use a separate card to switch the current source which does not require the nanovolt buffers.

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