Transmitter fault judgment, today we want to talk about the fourth method – voltage method and current method. Voltage method is one of the most basic methods of transmitter repair work. Simply put, the voltage method is to use a multimeter (or other voltmeter) to measure the appropriate range of the suspect part. Voltage method is divided into measuring AC voltage and DC voltage two kinds. Measurement of AC voltage mainly refers to the AC supply voltage, such as AC 220V network voltage, AC voltage regulator output voltage, transformer coil voltage and oscillation voltage, etc.; Measurement of DC voltage refers to the DC power supply voltage, electronic tubes, semiconductor components, the working voltage of each pole, the integrated block of the lead angle of the ground voltage. Here we need to remind you is that the voltage method of troubleshooting transmitter is actually limited in scope. Some faults such as slight short circuit coil, capacitor disconnection or slight leakage, etc., often can not be reflected in the DC voltage. Sometimes, such as a component short circuit, smoke, jumping fire and so on, it is necessary to turn off the power supply, at this time the voltage method does not work, then you must use other methods to check the transmitter. Current method is divided into direct measurement and indirect measurement of two kinds. Direct measurement is to disconnect the circuit after the series into the ammeter, measured current value and instrumentation in the normal operating state of the data for comparison, so as to determine the fault. If you find which part of the current is not in the normal range, it can be assumed that this part of the circuit has a problem, at least affected. Indirect measurement does not need to disconnect the circuit, measure the voltage drop across the resistor, and calculate the approximate current value based on the magnitude of the resistance value, which is mostly used for the measurement of transistor component current. The current method is a bit more troublesome than the voltage method, and generally requires the circuit to be disconnected and then tested in series with an ammeter. However, it is more prone to malfunction than the voltage method in some occasions. Current method and voltage method with each other, can check and judge the transmitter circuit in the vast majority of faults. Star Instrument Sensor Manufacturing Co., Ltd. is a collection of research and development, production, sales as one of the high-tech enterprises. Specializing in the production of pressure transmitters, level transmitters, temperature transmitters, temperature and humidity transmitters, differential pressure transmitters, soil moisture transmitters, 3051 transmitters and related instrumentation accessories. Many products under the brand of Star Instruments have obtained a number of patents issued by the state, such as CE certification, IS9001 certification, SGS certification, TüV SüD certification, explosion-proof certification and so on. For product consultation, product customization, agency, technical inquiries, quotations, etc., please contact Star Instruments: 400-600-4496 !