L-istruttura ta ' il diġitali multimeter u kif biex tuża it in dettall
Multimeter, ukoll magħruf as multipurpose meter, multi-meter, triple meter, complicated meter, etc., is an indispensable measuring instrument in power electronics and other departments, generally measure voltage, current and resistance as the main purpose.
Multimeter is divided into pointer multimeter and digital multimeter according to the display mode. It is a multifunctional, multi-range measuring instrument, generally the multimeter can measure MEASURE current, DC current, DC voltage, AC current, AC voltage, resistance and audio level, etc. Some can also measure AC current, capacitance, inductance and some parameters of semiconductors (e.g., ), etc. Il multimeter is a kind of measuring instrument with a rectifier, li can be used for the measurement of voltage and resistance.
Multimeter is a kind of magneto-electric instrument with rectifier, li can measure various electrical parameters such as AC and DC current, voltage and resistance. For each electrical quantity, there are generally several ranges.
Ukoll magħruf as a multi-meter or sempliċement multi-meter. A multimeter consists of a magneto-electric ammeter (head), a kejl circuit, and a selector switch. By changing the selector switch, a variety of electrical parameters can be easily measured. The main basis for circuit calculations is Ohm's law for closed circuits. There are many types of multimeters, li should be selected according to different requirements.
Multimeter to MF30 type pointer multimeter and DT840 type digital multimeter as an example, to understand its structure and performance, learn to use the multimeter to correct measure the voltage, current, resistance and other basic power methods, familiar with the use of precautions.
1. Struttura ta ' Pointer Multimetru
Prinċipalment minn il ras, kejl linja, swiċċ tliet partijiet.
L- użu ta' pointer multimeter, the main attention to the following points:
(1) Before use, the pointer of the meter head should be zeroed.
(2) Qabel kejl, il change-over switch should be dialled to a appropriateable position worthing to the item and size of the measured power.
(3) Kejl is complete, the transfer switch should be dialled to the highest AC voltage file, some multimeter (bħal 500 type) should be dialled to the transfer switch marked "..." The empty position.
2, AC vultaġġ kejl
(1) Qabel kejl, swiċċ għal il jikkorrispondi AC vultaġġ range. If int do not know the size of the measured voltage, the range should be placed in the highest level to avoid damage to the meter head.
(2) Meta kejl, connect the meter pens in parallel to the measured circuit or the measured components. It is strictly prohibited to toggle the change-over switch to select the range during the measurement.
(3) Meta kejl vultaġġ , get fi il drawwa ta ' id waħda operazzjoni u konċentrat tiegħek attenzjoni ħafna.
(4) As the AC voltage scale on the dial is calibrated according to sinusoidal AC, if the measured quantity is not sinusoidal, the error be larger.
(5) The frequency range of measurable AC voltage is generally 45HZ ∽ 1000HZ, if more than the range, the error will increase.
3 DC vultaġġ kejl
(1) with the measurement of AC voltage, measurement before the transfer switch to the DC voltage gear, in the case of the measured voltage is not clear in advance, the range should not be small; measurement, the pen should be connected in parallel with the measured circuit, the measurement is not allowed toggle the transfer switch.
(2) Meta kejl, the positive and negative polarity of the meter pens must be noted. The red pen is connected to the high potential end of the circuit being measured, and the black pen is connected to bend the pointer. If you don't know the potential of the measured point is high or low, you can gently try to touch the measured point with the meter pen. If the pointer reverse bias, the polarity of the pen is reversed, exchange the pen can be.
4. Kejl ta ' DC kurrent
(1) Measurement, the multimeter must be in series with the measured circuit, not in parallel.
(2) must pay attention to the positive and negative polarity of the pen. Measurement, the red pen connected to the circuit break high potential end, the black pen connected to the low potential end the black pen connected to the low potential end.
(3) In l-assenza ta' id-daqs ta' il il il imkejjel kurrent, il il-firxa għandhom ikunu kbar pjuttost żgħar. It is strettament ipprojbiti biex toggle the changeover switch to select the range in the measurement.
