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Keithley DMM7510, SMU 2450 & 2460 problems

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MegaVolt:

--- Quote from: maxwell3e10 on November 14, 2018, 09:37:32 pm ---Its also surprising that the noise is dramatically higher on the 10 Mohm setting.
--- End quote ---
I do not understand the physics of what is happening. Input impedance should not play a role when the inputs are shorted.


--- Quote ---So, its not a mirage, its a ghost. :palm:
--- End quote ---
I get it from the touchscreen. Switching hands ranges and resistance.

MegaVolt:
Next bug  |O

Multiple error when choosing the maximum buffer.

I chose Digitize voltage and tried to set the maximum buffer size. It will receive many errors with descriptions of the maximum allowed buffer size. Attempts to set the correct buffer size led to subsequent errors and a suggestion to reduce the buffer.

See the video for details.

MrFox:

--- Quote from: MegaVolt on November 16, 2018, 10:07:46 pm ---Next bug  |O

Multiple error when choosing the maximum buffer.

I chose Digitize voltage and tried to set the maximum buffer size. It will receive many errors with descriptions of the maximum allowed buffer size. Attempts to set the correct buffer size led to subsequent errors and a suggestion to reduce the buffer.

See the video for details.



--- End quote ---

There is the same bug in the 6500. Resizing buffers can sometimes cause memory fragmentation or memory leak.

Steps to reproduce on the 6500 (I have firmware 1.0.02a):
1. Reboot (power off, power on)
2. Go to Reading Buffers
--> The bug will appears if you do NOT touch the Buffer selector button and leave it at defbuffer1
3. Change capacity to 1M
4. Set buffer to defbuffer2
5. Change capacity to 10
--> Here the bug we see is that the buffer selection goes back to defbuffer1, but the capacity button is the value from defbuffer2
6. Set buffer to defbuffer1 (reselect it even if already selected)
7. Change capacity to 10
--> From this point, 1M is missing, it's not possible to either resize or create a buffer larger than 6M (7M is the max on the 6500). Until the next reboot.

In the mean time, it's simple to avoid the bug, always reselect the buffer before changing capacity.

MegaVolt:

--- Quote from: MrFox on November 17, 2018, 11:11:57 pm ---There is the same bug in the 6500. Resizing buffers can sometimes cause memory fragmentation or memory leak.
--- End quote ---
I failed to repeat this error on 7510.

MegaVolt:
It's inside DotNet  :palm:

That's what it gives out when trying to run a demoscript.


--- Quote ---com.keithley.internal.dotnet.ProxyIKeithleyTspInstrumentData.Java_com_keithley_internal_dotnet_ProxyIKeithleyTspInstrumentData_Write(IntPtr pEnv, IntPtr pObj1, IntPtr pStr2)
KeTSP Driver version:  4.0.6766.19771
--- End quote ---

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