Some Tips for Measuring Voltage with Multimeter
Measure unknown voltage
For digital multimeters without automatic range function, when encountering unpredictable voltages to be measured, the principle of "large range first, then small range" should be adopted: large-range measurement ranges are safe for multimeters; small-range measurement readings can be distinguished high rate
Anti-clutter
The digital multimeter is measuring some rich high frequency
Component signals are susceptible to high-frequency interference
The situation of words jumping randomly. For this + we can check the multimeter
Connect a small capacitor (001~01uF ceramic capacitor) in parallel between the positive and negative poles to eliminate high-frequency signal interference. Users who often test motor or engine signals can also connect a low-pass filter in series in the test circuit when they encounter interference. high frequency interference
Battery Measurement Tips
The input internal resistance of the digital multimeter is high, and it is not easy to distinguish the virtual high voltage of the battery when measuring an open circuit battery.
It is difficult for users to empirically judge how much power is left in the battery through the voltage. It is recommended to connect a 200Ω~1kΩ resistor in parallel between the test leads (or both ends of the battery) as a load when using a multimeter to measure the battery, which can eliminate the false high of the low-power battery. Voltage. It is recommended to choose a product with a power greater than 1/4W. When measuring a high-voltage battery pack, the load resistance value should be selected larger, and the power should be increased accordingly. The new low internal resistance battery measurement function of some new digital multimeters, the basic principle is The measuring terminal increases the load.
