Free Expert Guides on Power Systems, Circuit Design & Electrical Troubleshooting

In the following situations, a clamp ammeter is more convenient than a voltmeter:I. In occasions for measuring alternating currentNo need to disconnect the circuitA clamp ammeter can measure alternating current without cutting off the circuit. For example, when checking the current of an electrical device in operation, a clamp ammeter can directly clamp the wire without disconnecting the circuit for wiring operations, avoiding interference to the operation of the device and the possible safety r

1. Multimeter Resistance Measurement Principle Related CausesMultimeter Internal Power Supply PrincipleWhen measuring resistance with a multimeter, an internal battery is used to power the device. The multimeter forms a circuit with the measured resistance through its internal circuitry, and the resistance value is measured according to Ohm's Law. If the DC source is not disconnected, the external power supply will interfere with the measurement loop formed by the multimeter's internal circuit a

The method for a Megger tester to measure insulation resistance is as follows:I. Measurement steps Preparation Select an appropriate Megger tester model to ensure that its measurement range and accuracy meet the test requirements. For example, for insulation resistance testing of high-voltage power equipment, a model with a higher voltage output and a large measurement range may be needed. Check the battery power or power connection of the tester to ensure that the device is working properly.

When using a megohmmeter to test the insulation resistance of a power transformer, the following safety measures should be followed:I. Preparation before testingUnderstand equipment informationBefore conducting the test, obtain detailed information about the specifications, parameters, and operating status of the power transformer to be tested. Familiarize yourself with information such as the rated voltage and capacity of the transformer so as to correctly select the test voltage level of the m

The purpose of the ohm meterOhm meter is an electrical measurement tool specially used to measure resistance values, and its working principle is based on Ohm's law of closed circuits. The following are the main uses of ohmmeters: Direct resistance measurement: The ohmmeter can directly measure the resistance value of the resistor in the circuit, which is very useful for the design and fault diagnosis of electronic circuits. Judge the circuit status: By measuring the resistance, the ohmmeter can

How to Determine Whether an Ammeter or Voltmeter Is Connected in Series in a Circuit?Determining whether an ammeter or voltmeter is connected in series in a circuit can be done by observing the instrument's connection method and its readings. Here are specific ways to do this:How to Determine if an Ammeter Is Connected in Series?Physical Connection Direct Observation: The most straightforward method is to look at how the ammeter is connected to the circuit. An ammeter should be connected in seri

Accuracy and calibrationFlux leakageIn open-close current transformer, the opening and closing of the iron core will lead to leakage of magnetic flux. Because the core is not a complete, continuous loop like a solid core transformer, part of the magnetic field line may escape through the gap. This can lead to inaccurate ratios. For example, if the transformer is designed with a ratio of 100:1 (the ratio of primary current to secondary current), magnetic flux leakage may bias the actual ratio, re

A power system Fault Recorder, also known as a fault recorder or fault recorder, is a device used to record faults and related events occurring in a power system. This type of equipment plays a vital role in the monitoring, protection and maintenance of power systems. The following is a detailed description of the power system fault recorder:Feature Data acquisition: The fault logger can collect all kinds of data in the power system in real time, including voltage, current, frequency, phase Angl

Temperature sensors and pressure sensors are two different types of sensors that are each designed to detect different physical quantities - temperature sensors for temperature and pressure sensors for pressure. Nevertheless, in some specific cases, temperature sensors can be used indirectly to infer changes in pressure, but this is not a direct or accurate method. Here are some related discussions:The difference in principle Temperature sensor: Usually designed to detect the temperature of an o

Galvanometer is an instrument used to detect weak currents. In general, a negative current has a similar effect on a galvanometer as a positive current, but it may behave a little differently in the following ways:Pointer deflection directionDetermine current directionThe direction of the galvanometer pointer deflection is related to the direction of the current passing through it. Normally, when current flows from a particular direction of the galvanometer, the pointer deflects in one direction