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Hall effect test configurations

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shresk2
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Joined: October 6th, 2012, 11:42 am
Country: United States

Hall effect test configurations

Post by shresk2 » October 10th, 2012, 4:30 pm

I am reading the application note by keithley" High Impedance Semiconductor Resistivity and Hall Effect Test configuration" and trying in same way, the difference is instead of electrometer 6514, I have two 617 Keithley electrometer. I have 7012 card in the 7001 with the use of 4x4 switching configuration.
I wonder whether the keithley engineers already tried the hall measurements, or only the resistivity measurement tried. If hall was tried what was the resistance of resistivity of the sample used. Please let me know.
We have 7065 Hall card and it has limitation of 8V compliance and is not suitable for your high resistive samples ( 200ohm cm and up at RT), Please suggest.
Kiran
Univ of North TX

Dale C
Keithley Applications
Keithley Applications
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Re: Hall effect test configurations

Post by Dale C » October 12th, 2012, 6:34 am

The Model 7012 will work in this configuration.
But it is limited to about 1 Gohm. I have measured up to 1 G ohm with this method.
Look at the specs on the Model 7012. It states the isolation of about >1e9 ohms.
So it will work with this set up, it is not the optimal switch card for high impedances.
I recommend the Model 7065 Hall effect switch card.
Yes, it is limited to +/-8V, but the electrometer grade buffer amplifies lift the impedance level to much higher.
Also, the differential electrometer technique is a viable method for higher impedances, but with the 7012 it is still limited to about 1 G ohm.

Julie Bennett
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Joined: January 21st, 2013, 12:47 pm
Country: United States

Re: Hall effect test configurations

Post by Julie Bennett » January 21st, 2013, 1:21 pm

We need test the resistance on on Vishay VSMP Z Based Bulk metal Foil Technology discrete high precision surface mount chip resistors. We have resistor values varying from 700 ohm to 150 K ohm. The tolerance on these is 0.01%. We were planning on using a Keithley 2002 with a 4 point probe. Some parts on the list are:
VSMP0805 2K5500 TCR0.2 TBW
VSMP0805 10K200 TCR0.2 TBW
VSMP0805 8K8257 TCR0.2 TBW
VSMP1206 20K000 TCR0.2 TBW
VSMP1506 37K143 TCR0.2 TBW
VSMP2512 135K05 TCR0.2 TBW
VSMP0805 2K0000 TCR0.2 TBW
VSMP0805 1K5980 TCR0.2 TBW
VSMP1206 16K500 TCR0.2 TBW
VSMP1206 14K828 TCR0.2 TBW
VSMP1206 15K136 TCR0.2 TBW
VSMP0805 1K1500 TCR0.2 TBW
VSMP0805 8K8607 TCR0.2 TBW
VSMP1206 20K106 TCR0.2 TBW
VSMP2512 146K18 TCR0.2 TBW
VSMP0805 768R00 TCR0.2 TBW
VSMP0805 8K6397 TCR0.2 TBW
VSMP1206 28K442 TCR0.2 TBW
VSMP2512 108K76 TCR0.2 TBW
VSMP0805 1K8700 TCR0.2 TBW
VSMP0805 8K6908 TCR0.2 TBW
VSMP1206 23K923 TCR0.2 TBW
VSMP2512 97K492 TCR0.2 TBW
VSMP0805 1K7400 TCR0.2 TBW
VSMP0805 9K5856 TCR0.2 TBW
VSMP1206 15K541 TCR0.2 TBW
VSMP2010 73K019 TCR0.2 TBW
VSMP0805 1K6200 TCR0.2 TBW
I looked in the manual for the four point probe part number. there appears to be several... 5805, 5805-12, 5806, 8608 etc.. Can you let us know which is the right one for our application. These resistors are very suseptable to handing damage.
Thanks

Julie

Dale C
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Joined: June 10th, 2010, 6:22 am
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Re: Hall effect test configurations

Post by Dale C » January 22nd, 2013, 6:49 am

Hello Julie,
Here are the differences between the four wire probes.
Model 5805 - This set has two probes. Each probe has two electrodes. Each electrode is spring loaded and needle tip style. The needle tips are spaced 1/8" apart.
This set is good for holding a probe in each hand to get down to the device to test.
Model 5805-12 - This is a Model 5805 with the lead being 12 feet long.
Model 5806 - This set is a Kelvin clip lead set. It has two "alligator" type clips. Each jaw of the clip is a separate electrode. This is good to "clip" on to a device to measure.
Model 5808- Low cost single pin Kelvin probes. What this means is the two electrodes Source HI and Sense HI at combined in one needle type probe. Also Source LO and Sense LO are combined like the Source HI and Sense HI terminals. This is "handy" for tight spaces on the device to test.
Model 5809 - Low cost Kelvin clip lead set.
But since these are surface mount devices I would expect the Model 5808 to be the closest for your application. The reason I say this is because the four electrodes come down to electrodes for a "four wire" measurement.
Here is a link to the data sheet on the Model 5808.
http://www.keithley.com/support/data?asset=50660

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