What is the Ω range of a multimeter used to measure?
Manual range changing digital multimeter and automatic range changing digital multimeter. Their usage is very simple. When measuring resistance, insert the red probe into the "V Ω" hole of the multimeter, insert the black probe into the "COM" hole of the multimeter, and then adjust the range switch of the multimeter to the resistance position (as shown in the figure above). The red and black probes respectively contact the two pins of the measured resistor to read the resistance value of the resistor.
When measuring, for a multimeter with automatic range switching, there is no need to consider the resistance value, and the multimeter can automatically switch to the appropriate range. For a manual range changing multimeter, it is necessary to adjust the range switch to the appropriate position based on the resistance value before measuring. In addition, many manual range changing multimeters cannot return to zero in their minimum resistance range. For example, a typical 3/1/2 digit digital multimeter displays a reading between zero and a few ohms when the red and black probes are short circuited in the 200 Ω range (the smaller the reading, the better). Therefore, when measuring small resistance values below 10 ohms, the displayed reading should be subtracted from the reading when the red and black probes are short circuited to obtain the true resistance value of the small resistor.
Instructions for using a multimeter
We commonly use multimeters to test AC voltage, DC voltage, resistance, etc.
How to test resistance: First, set the switch to the resistance testing position. The two ends of the object to be tested should be in contact with the metal needle of the probe. If there is a beeping sound, it indicates that the wire is conducting, otherwise it will be disconnected.
How to test AC voltage: First, set the switch to the AC voltage measurement position, and touch the metal needles of the probes to the terminals that need to be tested for voltage. If there is a voltage, the digital meter will display the voltage value.
How to test DC voltage: First, set the switch to the DC voltage measurement position, and touch the metal tips of the probes to the terminals that need to be tested for voltage. If there is a voltage, the digital meter will display the voltage value. If the red meter head is the positive pole of the voltage, the tested value is positive, as shown in the diagram. If the red meter head is the negative pole of the voltage, the tested value is negative.
