Gentlemen, did any of you notice how the current in the circuit affects the connection of such a multimeter? I ignore the resistance of the wires and contacts themselves ...
OK, but how the serial connection of ammeters affects the current measurement depends only on their internal resistances.
Well, you finally start to think .
I noticed you touched on the topic of connecting two identical ammeters. In that case, we'll get the wrong result anyway, but I haven't specified here again. It is known that in the review I compare the tested product with a standard (better or worse). So they will never be two identical products.
It is known that in the review I compare the tested product with a standard (better or worse).
And for this comparison, the serial connection of ammeters was fully justified. He compared my colleague the tested meter with his own, unless I misunderstood and compared my colleague the tested meter with the indications of the power supply and added the indications of his meter to dessert.
I noticed you touched on the topic of connecting two identical ammeters. In that case, we'll get the wrong result anyway
Even one is misleading. Two more, if two are "the same", the error will be twice as large.
Same voltmeters. Modern ones have a resistance of 10Mohm. Much? Not necessarily, for example I have a 1:10 voltage divider from 18M and 2M resistors. Connecting 10M resistance in parallel to 2M will significantly change the result. From a divisor of 1:10 it becomes ~ 11.78.
In an oscilloscope, I mostly use a 1:10 probe. Not because of the high voltages, but just to increase the resistance I am loading the circuit.
only how the serial connection of ammeters affects the current measurement depends only on their internal resistances.
What is "Measurement Effect"? Is the sparrow different ??? The question is like an abstract joke. The pythia would answer. Need to clarify what affects what? How does it affect and then how great is the impact. Serial connection of ammeters, made only for the purpose of comparing their readings, is most appropriate. In this way, you can calibrate one instrument against another being the reference. Parallel connection of ammeters is idiocy ... The influence of the ammeter, not on the measurement, but on the measured system is obvious and fairly easy to evaluate. We just plug in additional series resistance. However, the effect can be "zero" when measuring the current of a current source. On the other hand, the influence of the resistance of the cables, and in particular of the contact of the measuring probe with the point of the circuit, on the measured circuit is enormous, because it sometimes introduces many times greater series resistance than the shunt of the ammeter. Sometimes a device powered by an ammeter won't work properly.