How to measure by multimeter

How to measure by multimeter

Multimeters are widely used for various electric measurements. It is very simple to use these devices. It is enough to expose the mode of measurement and limit, to switch the probe to the respective slot then to carry out measurement.

It is required to you

  • Multimeter


1. Two probes are applied to your multimeter: black and red. The first of them is always connected to the slot designated on the device as COM (common - the general). The second is connected to that from slots of multimeter which corresponds to the chosen type of measurement. Usually such slots three. One of them is intended for measurement of big currents (it is not protected by the safety lock), the second - for measurement of small currents (it is protected by the safety lock), the third - for measurement of tension and resistance. Also on multimeter there is small connector for connection of transistors.

2. To measure by multimeter current, tension or resistance, choose it as the switch the corresponding mode, sort of current and limit. Measuring tension, the device is connected parallel to that element on which voltage drop needs to be measured. At measurement of constant voltage if the positive pole is connected to the red probe, and negative to black, minus is not highlighted if on the contrary - it is highlighted. Measuring current, the device is connected in rupture of chain. The same rule works for minus on the indicator. When measure resistance, deenergize chain, discharge in it condensers. If there is risk of shunting of element which resistance is measured, other elements, it is unsoldered. Plus of internal energy source of ohmmeter is on the red probe.

3. When in multimeter the mode of measurement of resistance is chosen and the most rough mode is exposed, the sound sampler begins to work. The piezoelectric emitter of sound which is built in multimeter begins to peep if resistance between probes is less than certain value (usually 50 Ohms).

4. Having included multimeter in the mode of measurement of parameters of diodes, it is possible to determine tension falling on the diode during the work in the stabistor mode. The diode vypayanny from the scheme, connect in the direct direction, that is, the anode to the red probe.

5. Having switched multimeter to the hfe mode and having connected to its special slot the transistor, vypayanny from the scheme, according to its pin-connection diagram, it is possible to measure its carryover factor of current.

6. In all cases, unit in the senior discharge and gaps in the others, or, depending on model, the letter O.L. (overload) designate off-scale sweep or, in the mode of measurement of resistance, its too great value. The blinking minus means that the cycle of measurement is not finished yet. Before reading of indications it is necessary to wait, so far minus will not cease to blink.

Author: «MirrorInfo» Dream Team