How to judge pressure quick resistor stand or fall

Judgement pressing quick resistor needs to adjust normally a power source with voltage very wide range, and have very good current limliting effect. When measurement, be in pressure quick resistor the volmeter with very good precision of two upright paralell connection. Adjustable power source down-lead is received repeatedly pressure quick resistor two end.
Slow adjustment voltage rises, volmeter indicates power source voltage, observe after amounting to a certain voltage, voltage is reduced suddenly, before reducing, last hour voltage is pressed namely quick the protective value of resistor.

Pressure quick resistor it as add in the voltage above it to increase ceaselessly, its resistance is OK from M Ω (million Europe) class changes M Ω (fine long hair Europe) class. When voltage is inferior, pressure quick resistor works at leakage current area, present very great resistance, leakage current is very small; Lift when voltage enter nonlinear after the area, electric current is in inside quite big range when change, voltage change is not big, present better voltage limiting character; Voltage is again elevatory, pressure quick resistor enters saturated area, present a very little linear resistance, because electric current is very big, time grows to be able to make press quick resistor overheat burn down even scamper is cracked.
When measuring archives of avometer buy 10k, watch pen is received at resistor two end, should show on avometer pressure quick the indicative block value on resistor, if exceed this numerical value very big, explain pressure quick resistor already caustic.

 Can judge this pressing with avometer quick the stand or fall of resistor.
 archives of avometer buy 10k, watch pen is received at resistor two end, should show on avometer pressure quick the indicative block value on resistor, if exceed this numerical value very big, explain pressure quick resistor has damaged.
 Pressure quick resistor as add in the voltage above it to increase ceaselessly, its resistance is OK from M Ω (million Europe) class changes M Ω (fine long hair Europe) class. When voltage is inferior, pressure quick resistor works at leakage current area, present very great resistance, leakage current is very small; Lift when voltage enter nonlinear after the area, electric current is in inside quite big range when change, voltage change is not big, present better voltage limiting character; Voltage is again elevatory, pressure quick resistor enters saturated area, present a very little linear resistance, because electric current is very big, time grows to be able to make press quick resistor overheat burn down even scamper is cracked.