Method for measuring UPS power frequency with digital multimeter
For UPS power supplies, the stability of the output voltage is an important parameter, and the output frequency is also important. But it cannot be directly measured using the frequency range of a digital multimeter, as its frequency range can withstand very low voltages, only a few volts. At this point, a 220V/6V or 220V/4V step-down transformer can be connected to the output terminal of the UPS power supply to reduce the voltage without changing the frequency of the power supply. Then, the frequency range can be connected to the output of the transformer to measure the frequency of the UPS power supply.
In general, the use of a digital multimeter still needs to be operated in the correct way. Blindly using it without understanding its principles and functions is necessary. Reasonable operation according to the correct method is also beneficial for the digital multimeter to be better used by us and extend the lifespan of the instrument.
Frequency is the number of cycles a signal completes per second. Some digital multimeters can measure the frequency of a signal, such as the FT215 digital multimeter, by calculating the number of intersections between the measured signal and the trigger level per second. The trigger level for all ranges is the same as the COM terminal level. Under the communication measurement function, press the SHIFT key to activate and deactivate the frequency measurement function. Frequency measurement is only applicable for communication. When measuring frequency, the analog pointer display and range display can indicate the current AC voltage or current. Use the manual range function to gradually select a lower range to obtain stable readings.
