1. The difference in the order of rectification and shunt

2. Common Rectification AC Ammeter Circuit

In a typical digital multimeter, there are two fuse tubes, one is around 500mA, and the other is around 10A. The two fuses are connected in series at different current levels. Once the fuse is burned out, the corresponding current level will definitely be unusable, while the voltage and resistance levels can still be used normally.