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Problems sourcing High Voltage on some SMUs

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ww0206
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Problems sourcing High Voltage on some SMUs

Post by ww0206 » October 19th, 2016, 7:18 am

On two of my SMUs (1&3) I cannot source more than 38V. There is no error message but the voltage never goes above 38V. This happens on the KITE software and using GPIB and Labview.

The interlock is satisfied as the light is on and it works for SMU 2 up to 200V happily.

SMU1 is a 4200 type. (Doesn't go higher than 38V)
SMU2 is a 4200 type (Works fine)
SMU3 is a 4210 type (Doesn't go higher than 38V)

Can anyone help?

Andrea C
Keithley Applications
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Re: Problems sourcing High Voltage on some SMUs

Post by Andrea C » October 20th, 2016, 5:44 am

Here are some ideas:

1) if the voltage sourcing SMU is encountering a current compliance limit, it will not be able to achieve the desired voltage.
So check the current limit setting, the cable, etc.

2) The 4200 supports an Over Voltage Protection setting. Probably not likely but possible that the OVP level was set to 38v for these two SMU. Check the OVPControl User Library and set the max voltage to 200 for SMU1 and SMU3.

3) Hardware malfunction? In KCON, can you run self test on the two SMU?

ww0206
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Joined: October 19th, 2016, 7:08 am
Country: United Kingdom

Re: Problems sourcing High Voltage on some SMUs

Post by ww0206 » October 24th, 2016, 3:17 am

Hi Andrea,
I have tried your suggestions but none seem to help.

1) The current is well below the compliance limit, and the output always finds a maximum at 38V regardless of the device tested.

2) The OVP setting was off. Playing with this setting does not increase the voltage output.

3) All SMU self tests came back as "passed"

brian.d.smith
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Re: Problems sourcing High Voltage on some SMUs

Post by brian.d.smith » October 24th, 2016, 7:55 am

Have you disconnected all the cables from the rear of the 4200? This will isolate a 4200 problem from a cables/devices issue.
For each individual SMU, source voltage and measure current.You should be able to run each SMU up to 200V and the measured current should be very low.

If that works well, then try cabling pairs of SMUs directly together. You can perform various combinations for forcing current or voltage on the SMU pairs to see how sourcing and sinking current agrees between pairs of SMUs. Then you can place a resistor between the SMU pairs, force current and measure voltage.

When was the last time that your 4200 was calibrated?

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