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webdragon89 asked What changes inside a muilti-meter?
When the range is changed from 200V to 20V in a digital multi-meter, what changes internally? By what factor does it change? When you change it from voltmeter to ammeter what happens internally? When the current range changes what changes internally and by what factor does it change (20ma to 200ma)?
And got the following answer:
Well first I should point out the real differences between an analog multimeter and a digital multimeter. I own and use both, but they are totally different creatures in practice. An Analog Meter as central to it's functionality has a large centrally located on it's face a rotary finger operated switch to choose both function and range. By function I mean the mode of operation to measure such parameters as voltage, amperage, polarity of DC currents, measurements of resistance amongst others. By range I mean the rather wide ability to represent measurements that physically move a V U meter needle across a paper scale beneath it and printed upon this graph the range of possible outputs possible many of a range of instrumentality of several orders of magnitude! In layman's terms to display lets say voltages from .001 volts, one thousandths of a volt all the way up to possibly 1,000.00 volts, thousands of volts. Each decimal place up or down is an additional order of magnitude, or X10. behind the rotary selector switch on an analog meter is a crowded array of resistors and some capacitors to adjust the electrical inputs from the 'leads' (input wires) down to a quantity that the magnetically moved VU needle can accept without damage. To further extend the already wide display range, the paper graph under the VU needle may employ an additional logarithmic scale along side the linear ones and also require dedicated switch settings to utilize this feature. Digital meters are visibly simpler by far than the analog variety, bu this is mostly because most of the work done by all those clustered resistors upon resistors in analog units are handled by micro miniature integrated circuits of the type used by nearly everything these days. Some digital units still have that central rotary selector switch, but some more expensive units have an auto range finding feature, so you need not merely guess at what setting to use if you don't know have a first guess of what you ranges you might be measuring. These nicer types just have but a few simple switches to choose functionality with. In integrated circuits those resistors still necessary are as tiny as a grain of salt and embedded in the main body of the main or ancillary chips as necessary. When the range is changed from 200V to 20V it is mainly a function of switching of resistors or the employing of voltage comparator circuits that work like circuit controlled old fashioned carbon color banded resistors. When you change it from voltmeter to ammeter the voltage setting is managed by regulating voltage out to those voltages the display can handle. The ammeter is a separate circuit that uses a intermediary circuit like a tiny isolating transformer circuit that prevents High amperage's from entering and destroying the LCD display. The input leads would then form a very simple closed circuit primary coil, that if another secondary wire coil is placed nearby the first , it will induce an electrical potential in the secondary coil, and that more reasonable electrical quantity is then fed to the same sort of voltage comparator circuitry as described earlier, then routed to the display. I hope this has helped.