Using megohmmeter and multimeter to judge the circuit diagram of axial pressure tube

Using megohmmeter and multimeter to judge the circuit diagram of axial pressure tube

Both semiconductor Zener diodes and ordinary diodes have the property of unidirectional conduction, and their volt-ampere characteristics are also similar. It is sometimes difficult to distinguish them just by appearance inspection.
However, there are also important differences between Zener diodes and ordinary diodes. First, diodes work under forward voltage, while Zener diodes must work under reverse breakdown state. Second, the reverse breakdown voltage of ordinary diodes is generally high, above 40V, and some even reach thousands of volts. The reverse breakdown voltage is generally high, above 40V, and some even reach thousands of volts. The range of reverse breakdown voltage is large, and the dynamic resistance is also large. The reverse breakdown voltage (i.e., stable voltage Uz) of the Zener diode is low, generally a few volts to tens of volts, and the volt-ampere curve is very steep, i.e., the dynamic resistance ①
According to the difference in the numerical value of the reverse breakdown voltage of the two, the Zener diodes with unclear markings and ordinary diodes can be distinguished. See the circuit 1-23. + and - represent the positive and negative test leads.