General Measurement and Ground Resistance Measuring Methods Using a Multimeter
Resistors mainly appear in two forms in circuits. One is series connection, which means connecting the beginning and end of each resistor. In a circuit, the current flowing through each resistor is the same, but the voltage is different. Its resistance value is the sum of the resistance values of all series resistors; Another type is parallel connection, which is exactly opposite to series connection. The voltage across each resistor is the same, but the current flowing through it is different;
Everyone also has some understanding of resistance. Below, we will popularize the general measurement and measurement methods of resistance to ground. We can use a multimeter to operate, and the specific methods are as follows:
For general measurement and ground resistance, the ohm range of a multimeter can be used to check if the resistor is damaged or to test its resistance value.
Adjust the multimeter to the ohm range and connect the two probes (positive and negative) of the multimeter to the two pins of the resistor to measure the actual resistance value. As shown in the following figure:
When testing resistors, especially when detecting high resistance values, do not touch the probe and the point-to-point part of the resistor with your hands. When it is necessary to detect the resistance in the circuit, the resistor can be soldered off from the circuit, at least one end should be soldered open, to avoid other components in the circuit affecting the test and causing measurement errors.
Ground resistance refers to a circuit detection method using a multimeter:
Place the black probe of the multimeter on the shielding cover or large copper ground of the circuit board, and the red probe of the multimeter contacts a certain pin or test point of the component on the circuit board. The multimeter displays the ground resistance of that point.
The resistance to ground can be positive or negative. The forward resistance to ground and the reverse resistance to ground mentioned above are the resistances detected when the red probe of the multimeter is grounded and the black probe is connected to the test point.
