Skaitmeninis multimetras matas dažnis UPS galia šaltinis metodas
Dėl UPS galia maitinimas. The stability of its output voltage is an important parameter, the output frequency is also labai important. But not directly with a digital multimeter frequency block to measure, because its frequency block can withstand the voltage is very low. Only a few volts. Šis gali būti prijungtas to the output of the UPS power supply 220V / 6V or 220V / 4V step-down transformer, the voltage is reduced, conging the frequency of the power supply, and then the frequency block and the output of the transformer connected to the frequency can be measured out of the UPS power supply.
In general, the use of digital multimeter or to use the correct method of operation, can not understand the principle and function to blindly use, reasonable in accordance with the correct method of operation is also conducive to the digital multimeter better for us to use, to extend the life of the instrument.
Frequency is the number of cycles a signal completes per second. Some digital multimeter can be measured, such as the FT215 digital multimeter by calculating the number of times per second the measured signal and the trigger level of the intersection to measure the frequency of a signal. The trigger level for all ranges is the same as the COM terminal level. Under the AC measurement function, press SHIFT to start and close the frequency measurement function. Frequency measurement applicable to AC only. During frequency measurement, the analog pointer display and range display indicate the current AC voltage or current. Use the manual range function to incrementally select a lower range for a stable reading.
The first method: the multimeter will now be adjusted to the AC file (if the sub-file, adjusted to a gear greater than 220VAC), the black pen directly connected to the earth (can be connected to the middle of the three-phase socket that hole, if not can be directly connected to the ground or the wall), the red pen were connected to the zero line and the firewire socket holes, the number of larger is the firewire.
Of course, if you can not find the contact point of the zero line or the fire line, you can not peel off the insulation of the wire, a meter pen grounded, another meter pen directly near the wire insulation can be read larger for the fire line, smaller readings for the zero line.
