Common Electrical Measurement Tools and Their Usage
This article introduces the usage methods and precautions for several commonly used electrical measurement instruments, including multimeters, ohmmeters, voltmeters, ammeters, and resistance measuring devices.
1. Briefly describe the method for testing non-marked diodes with a multimeter.Answer: Select the appropriate range; calibrate to zero; measure the forward and reverse resistance of the diode. When a high impedance is displayed, the end connected to the red probe is the positive terminal of the diode.
2. Briefly describe the usage method for a pointer-type multimeter in resistance measurement.Answer: Estimate the size of the resistance to be measured and select the appropriate range; calibrate to zero; measure the resistance value; if the range is not suitable, change the range and recalibrate to zero and retest.
3. Briefly describe the usage method for a megohmmeter.Answer: Correctly select the specifications and model of the megohmmeter; connect the leads correctly; rotate the handle evenly; wait for the needle to stabilize before reading; pay attention to the capacitance in the circuit being tested; note that the megohmmeter outputs high voltage.
4. Briefly describe the usage method for a power meter.Answer: Correctly select the specifications and model of the power meter, choose the appropriate voltage and current ranges, connect the voltage coil in parallel across the load, and connect the current coil in series with the load.
5. Briefly describe the usage method for a clamp meter.Answer: Zero the meter before use; estimate the size of the current to be measured and select the appropriate range; place the wire being measured in the center of the clamp jaws; if the current in the circuit is too small, you can wrap the wire around the core of the clamp a few times.
6. How to use a clamp meter?Answer: Before measuring current with a clamp meter, check if the pointer of the meter points to zero; if not, perform mechanical zero adjustment; also check the opening and closing condition of the clamp jaws, ensuring they open and close smoothly; to improve measurement accuracy, you can wrap the wire being measured around the core of the clamp a few times; during measurement, ensure the wire is placed in the center of the clamp jaws to minimize measurement error.
Multimeters are mainly divided into pointer-type and digital multimeters. Currently, the use of pointer-type multimeters is rare; next, we will introduce the use of digital multimeters.Digital multimeters are the most commonly used tools for measuring current, voltage, and resistance. Whether for electricians, thermal engineers, or those involved in the manufacture or repair of electronic devices, they are essential for measurements. Digital multimeters are widely used, lightweight, and portable, making them popular among users.To measure voltage, it is divided into direct current voltage and alternating current voltage. Therefore, to measure direct current voltage, set the dial to the DC voltage range and connect the probes to the circuit.
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