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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