What is the function of the multimeter's diode buzzer?
The function of the multimeter's diode buzzer is to detect whether the circuit is connected and to detect the diode Hall resistance.
First, check whether the line from the controller to the terminal is connected. For example, detecting the circuit of the handlebar: unlocking, energizing the whole car, turning on the power door, the car will not move, and changing the handlebar will not work either. The red test lead is connected to the controller's handle wire, and the other section is connected to the handle terminal to detect whether red, black, and blue are connected. If the buzzer does not sound, it means that the line is broken.
Second, check whether the handle and motor hall are damaged. The red test lead is connected to the negative signal line of the handle, and the black test lead is connected to the green signal of the handle. A reading of 500 to 600 indicates that the handle is normal. The motor Hall is red and connected to the negative signal line, and the black test lead is connected to the green line, yellow line, and blue line in sequence. If there is a stable value of 500 to 600, it means that the Hall is normal. (A value of 500-600 represents a positive voltage change of 0.5-0.6)
Third, check the quality of the controller phase line. The red one is connected to the main negative line of the controller, and the black one is connected to the yellow, blue and green three phase wires at a time. If the measured values are the same, it means that the phase wires are normal.
Fourth, check the quality of the LED bulb. The black pen is connected to the negative pole, the red pen is connected to the positive pole, and the light is on normally.
What does the letter n on the capacitance scale of a digital multimeter stand for?
The letter n in the capacitance range of a digital multimeter indicates that the range is nF (nF here is pronounced nanofarad).
"20n" refers to the 20nF range, which can measure capacitance below 20nF. When measuring capacitance with a digital multimeter, insert the red test lead into the multimeter's Cx jack and the black test lead into the COM jack, and then adjust the range switch to the appropriate position based on the size of the capacitance being measured.
A multimeter has the basic functions of measuring resistance, voltage, and current, as well as extended functions such as measuring capacitance, inductance Hfe, etc. When using it, use a knob to adjust it to the appropriate gear according to the measurement results. Among them , the gear for measuring capacitance is called "capacitance gear". In fact, N is a unit, n means nf, 1nF=10>-9F, in simple terms, n means "nano".
