Metodes un piesardzības pasākumi mērošanai mērīšanai pretestība of a digitālais multimetrs
Laikā mērījums, the pozitīvais jauda padeve is uzlādēts to the izmērītais kondensators Cx caur the standardized rezistors R{{{{{}}}}, and the display show "000" because Vc=0 at the moment of the beginning of chargeing. As Vc pakāpeniski aug augstāk, the display value palielinās. Kad Vc=2VR, the meter starts to display the overflow symbol "1". Charge time t for the display value from "000" changes to overflow time required, the time distance can be measured by quartz meter. The use of DT830-}type digital multimeter to estimate the capacitance of 0.1μF ~ thousands of microfarads capacitors, in accordance with Table 5-1 selection of resistance gear, the table give the diapazons of izmērāmā kapacitāte un atbilstošais uzlāde laiks.
Digitālais multimetrs pretestība mērīšana mērīšana metode
When measuring the resistance, should be in the scale marked "ω" to see the reading (because the current through the meter head and the measured resistance is not proportional to the relationship, so the resistance scale on the dial is not uniform.) The actual value of the measured resistance is equal to the reading on the scale multiplied by the multiple indicated by the knob. Before measurement, the two pens should be shorted and the zeroing potentiometer should be turned so that the pointer is at the position of 0ω, and then the appropriate stop should be selected to ensure the accuracy of the measurement. Every time you change a measurement limit, you have to re-zero. In addition, the measurement of resistance, must be no source and no other parallel branch circuit. After the resistance (or current) measurement is completed, the changeover switch should be rotated to the high voltage stop, which is a good habit to prevent the misuse of ohmmeter (or current stop) voltage measurement.
Piesardzības pasākumi digitāls multimetrs pretestība
Cipars multimetrs būs būs izsaukts uz atbilstošā pretestība fails, the red pen and the black pen to atšķirt starp kontakts ar the izmērīts kondensators Cx poles, then the display value will start from "000" pakāpeniski palielināt, līdz the display overflow symbol "1". Ja pastāvīgi displejs "000", marķējums the kondensators iekšējais īsais ķēde; if pastāvīgi displejs pārplūde, it var būt kad kondensators iekšējais starppols open circuit, can also be enough when the selected resistance file is not appropriateable. Test electrolytic capacitors must attention to, the red pen (positive charged) connected to the positive terminal of the capacitor, the black pen connected to the negative terminālis of the kondensators.
