How to insert the red test pen and black test pen of the common multimeter into the multimeter
The multimeter has two pens, red and black. When using, the red test pen should be inserted into the jack marked "+", and the black test lead should be inserted into the jack marked "-". The main performance indicators of the multimeter basically depend on the performance of the meter head. The sensitivity of the meter head refers to the DC current value flowing through the meter head when the pointer of the meter head is deflected at full scale. The smaller the value, the higher the sensitivity of the meter head. The greater the internal resistance when measuring the voltage, the better the performance.
