| Products > Test Equipment |
| Hacking the Siglent SDM3055 Bench DMM |
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| alexvg:
--- Quote from: Kleinstein on September 05, 2019, 09:32:10 pm ---For very large resistors a common method is to add some resistance like 10 M in parallel. This allow to measure very large resistors, though with reduced accuracy and a nonlinear function to convert from the raw reading to resistance. As the SDM3055 is more like a budget instrument, I would expect this method. --- End quote --- Yes, I've tested multiple methods without the correct results (I need to find the exact value displayed by the original DMM software). I continue my investigations. |
| Nornand:
Datasheet says Range: 100 MΩ 200 nA || 10 MΩ |
| alexvg:
--- Quote from: Nornand on September 06, 2019, 10:46:39 am ---Datasheet says Range: 100 MΩ 200 nA || 10 MΩ --- End quote --- Yes it's a current generator. But I could not find the exact result. Edit: I think I've found it... I need to do multiple checks. |
| alexvg:
I've finally found 2-wire and 4-wire measurement method. I'm working to found how calibration work... |
| alexvg:
I'ts ok !!! I've successfully found the method used for 2-wire and 4-wire resistance measurement. I've discovered 2 problems with 2-wire and 4-wire 100M measurements : - I've measured 144mV p-p 50Hz at the input of the ADC (with open input but with LO/Losense shorted) - The XML calibration is not fully used : 0-50M segment is used for 0-120M and 50-120M is not used at all !!! A interresting information : - I've success fully generate a 0V ADC input with 0x800000 output data (with +/-1LSB precision during more than a minute- 7FFFFF to 800001) I've done my measurements with : - 10K to 130M with 0,01% 0,1% or 1% resistance value (for 2-wire and 4-wire) - I use a Rigol DG4102 with filtered output and 20dB or 40dB attenuation for simulate resistance (only 4-wire) |
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