| Products > Test Equipment |
| Hacking the Siglent SDM3055 Bench DMM |
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| alexvg:
--- Quote from: CDaniel on September 23, 2019, 06:54:50 am ---If the big error is for high value electrolytic caps it is fairly normal for a multimeter ... even two different Fluke don't display the same value and could be easily 10% off . For the simple method of charging/discharging the cap the time is dependent on losses and current used ... --- End quote --- The error is spread over all the measures (but above the Siglent specs). The current used is specified into the SDM3055 datasheet (200nA to 1mA). I don't understand why Siglent doesn't incorporate a little frequency generator to do a more precise and FAST capacitor (and inductance) measurement using the 2 or 4 wires |
| alexvg:
I've done DCI and ACI. It was very funny because DCI 200uA range have an internal inverted polarity (-11uA measure and +11uA display). |
| alexvg:
Here is a list of reverse engineering features done : - DCV (all range, filter mode and 10M/10G for 200mV and 2V) - DCI (all range and filter) - ACV (all range) - ACI (all range) - Resistance 2-wire (all range including 100M !!!) - Resistance 4-wire (all range including 100M !!!) - Frequency (all ACV range) - Capacitance (all range) Remaining functions : - Diode - Continuity - Temperature Edit: All functions done ! |
| tv84:
--- Quote from: alexvg on September 24, 2019, 08:42:17 pm ---Edit: All functions done ! --- End quote --- :clap: Where there's a will there's a way! |
| Kleinstein:
--- Quote from: alexvg on September 24, 2019, 06:20:07 am ---I've done DCI and ACI. It was very funny because DCI 200uA range have an internal inverted polarity (-11uA measure and +11uA display). --- End quote --- An inverted polarity could happen if they use a trans-impedance amplifier for the low range. In this case I would expect to have at least 2 such ranges, possibly the option to add a 20 µA range. |
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