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Electrical instrumentation_Electrical common instrumentation_Multi-function electric instrument brand
There are various types of electrical measuring instruments that electricians frequently use, including AC and DC current meters, voltmeters, power meters, electricity meters, phase meters, power factor meters, multimeters, insulation resistance meters, grounding resistance meters, clamp meters, single and double bridges, resistance boxes, and electrostatic voltmeters. These tools are essential for any electrician's toolkit. Do you know more about the features and brands associated with these instruments? I've gathered some information online that might help electricians better understand their options.
Below is a list of ten domestic multifunctional instrument brands that you might find useful:
1. Xi’an Wesson Electric Co., Ltd.
2. Shennian Power Technology Co., Ltd.
3. Fuling Aobosen Electric Factory
4. Nanjing Nengbao Electric Co., Ltd.
5. Zhuhai Snowova Technology Co., Ltd.
6. Suzhou Langlis Electronic Technology Co., Ltd.
7. Changzhou Sanhe Sound Source Ultrasonic Technology Co., Ltd.
8. First Planning Company
9. Jiangsu Ankerui Electric Manufacturing Co., Ltd.
10. Shenzhen Guodian Xuzhen Electric Technology Co., Ltd.
Now let’s discuss the different types of electrical instruments and their functions:
**1. Ammeter**
An ammeter is used to measure current and comes in both DC and AC varieties. When using an ammeter, it's important to choose the right range and connect it in series with the circuit being measured. Ensure the current flows from the "+" terminal of the meter and exits through the "-" terminal. Wiring should always be done under power-off conditions. DC ammeters cannot be used on AC circuits.
**2. Clamp Meter**
Clamp meters, or clamp-on ammeters, are popular for their convenience. They come in both AC and AC-DC versions. When using a clamp meter, check the voltage rating of the meter against the line or equipment being measured. Always set the range selector to a value equal to or greater than the expected current. Estimate the current before measuring and switch ranges with the jaws open. Keep a safe distance from live components and never measure exposed conductors.
**3. Voltmeter**
A voltmeter measures voltage and is available in DC and AC versions. When using a voltmeter, select the appropriate range and connect it in parallel across the terminals being measured. Be sure to follow the polarity markings on the voltmeter. Wiring should be done under power-off conditions, and the voltmeter should never be used in series in the circuit being measured.
**4. Multimeter**
Also known as a multitester, a multimeter can measure a variety of parameters including DC and AC current, voltage, resistance, capacitance, and more. Both analog and digital multimeters are available. Always calibrate the meter to zero before use and pay attention to the range and scale. Digital multimeters are particularly popular due to their ease of use and accuracy.
**5. Insulation Resistance Meter**
Also called a megohmmeter or insulation tester, this tool is used to measure the resistance of insulation. Modern models may use either a hand-cranked generator or transistors. When using an insulation resistance meter, avoid exceeding the measurement range significantly, as this can lead to inaccurate readings. Always disconnect power from the device under test and ensure it is grounded before testing.
**6. Electricity Meter**
Electricity meters, or watt-hour meters, measure the amount of electrical energy consumed over a specific period. They come in single-phase and three-phase models, as well as active and reactive energy versions. When installing an electricity meter, ensure it matches the voltage and current ratings of the circuit and follow the manufacturer’s instructions carefully.
The accuracy of electrical instruments is often expressed in terms of error levels. The error of a meter refers to the difference between the indicated value and the true value. Errors can be classified as absolute, relative, or reference errors. Additionally, there are seven accuracy levels for electrical instruments, ranging from 0.1 to 5.0. Higher accuracy levels are typically used in laboratory settings, while lower levels are suitable for fieldwork.
In conclusion, choosing the right electrical instrument depends on the application and required accuracy. Whether you're a professional electrician or a hobbyist, having a reliable set of tools is crucial for accurate measurements and safe operations.