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Ben niet goed thuis in dit soort zaken, maar er blijken op dit late uur niet veel mensen on line te zijn, die je daadwerkelijk kunnen helpen.
Explained here (probably the text you're translating, or very similar) :)
When connecting the (digital) multimeter in series with a test circuit to measure current, a measurement error is introduced, the cause being the multimeter’s series burden voltage. A voltage is developed across the wiring resistance and current shunt resistance of the multimeter (see Fig. 12.)