Correct operation method of digital multimeter to measure voltage and current
Before using the digital multimeter, you should read the relevant instruction manual carefully and be familiar with the functions of the power switch, range switch, jack, and special jack. (1) Put the ON/OFF switch in the ON position, check the 9V battery, if the battery voltage is insufficient, it will be displayed on the display, then the battery needs to be replaced. If the display does not show, follow the steps below. (2) The symbol next to the test pen jack indicates that the input voltage or current should not exceed the indicated value, which is to protect the internal circuit from damage. (3) Before testing. The function switch should be set to the range you need.
1. Insert the black test lead into the COM jack and the red test lead into the V/Ω jack.
2. Set the function switch to the DC voltage range V-range, and connect the test lead to the power supply to be measured (to measure the open circuit voltage) or the load (to measure the voltage drop of the load). The polarity of the red lead will be displayed at the same time. on the display.
If you do not know the voltage range to be measured when using the digital multimeter. Set the function switch to the maximum range and gradually decrease it. If the display only shows "1", it means over-range, and the function switch should be set to a higher range. "" means do not measure voltages higher than 1000V, it is possible to display higher voltage values, but there is a risk of damage to the internal wiring. When measuring high voltages, take extra care to avoid electric shock.
