В некоторых случаях требуется измерять очень большие напряжения (десятки киловольт). Для таких целей существуют специальные приборы – «киловольтметры».
Buy specially kilovoltmetr is meaningful only when you need it quite often measure "kilovolty". In everyday amateur radio practice measuring the same conduct have very rarely. And in this case, you can do a simple multimeter.
But the upper limit of the measurement voltage a standard multimeter, usually no more than 2000V. In order to change could made multimeter considerably higher voltages, it must be supplemented by prefix in the form of high-resistance and high-voltage voltage divider. The following figure shows the layout of this divider. It consists of ten resistors resistance on each MOm 68 included consistently, and one resistor on 68 Om.
High-resistance resistors form one shoulder divider a total resistance of a reciprocal 680 MOm. And the second shoulder forms resistor 68 Om. Turns out the voltage divider on the 10000.
Divider output connect to terminals "COM" and "VΩmA" and input (X 1 and x 2) to the circuit being measured.
Set the multimeter to "2000mV", in which he will show to 20КV and "20V" theoretically, up to 200 KV. Although, it should be noted that in this way it is impossible to measure the voltage over 50 KV as prefix-voltage divider provisions can punch. Or do I need to do another set-top box, quite differently to handling isolation, and with great resistance. As for this console, all the resistors should be large capacity not less than 2W and installation you want to perform — all resistors in line evenly, so that the distance between terminals X 1 and X 2 was not less than 200 mm.
Insulation shall withstand a great deal of stress. Diagram it is possible to collect three-dimensional way and put inside a glass tube, the ends of which close the rubber plugs (through them to release the wires). Installation can be done on a sheet of acrylic glass, on which to install Terminal. In any case, installation should exclude the occurrence of leakage currents and dijelektri technical properties framework should be measured voltage.
ATTENTION! When working with the appliance you need to comply with all measures predostorozh productivity when working with high-voltage installations.
The prefix is unsuitable for measuring voltages in high-voltage transmission lines and industrial electrical installations!
Voltage can be measured only at the entrances of the multipliers, pulse sources, sweep of TVs, and other such schemes.
Author: Andreev S.
