- Laboratory autotransformer (LATR), 10k resistor, rectifier 120 volts, a multimeter.
Turn the multimeter to the diode test.To do this, turn the handle to the position which is shown in the figure.Touch findings zener multimeter probes.Then reverse the probes and then touch their findings zener.In one of the provisions of the meter should show the Zener resistance 300 - 600 ohms in a different position on the display is to be number 1 in the leftmost register (which means that the measured resistance of the device infinitely large for the multimeter measuring range).In this case, the zener diode is OK.
Zener diode is defective if the me
ter in both cases measurements show infinite resistance (internal breakage), a very low resistance (breakdown) or resistance of the order of 30 - 500 ohms (poluproboy).
To verify that the zener collect the following scheme: rectifier plug 120 Volt plug for laboratory autotransformer.Regulator laboratory autotransformer put in the position corresponding to the minimum voltage at its output.To the output terminal of the rectifier in series with a resistor of 10 ohms, connect a zener diode (cathode to the positive terminal of the rectifier), connect the multimeter in parallel zener included in the measurement mode DC voltage in the range of 200 volts.
including laboratory autotransformer.Turn the knob to adjust the output voltage of the autotransformer, gradually increase the voltage across the zener.At the same time watch the voltage readings on the meter display.The voltage must reach a certain size and stop growing.This value will be voltage zener.If it is less than 20 volts, switch the multimeter to measure the position of the DC voltage in the range of 20 volts.Read the multimeter display with a more accurate reading of the Zener voltage stabilization.