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Soil Moisture Measurement

Delta-T Devices is a market leader in soil moisture monitoring, with more than twenty years experience of providing researchers with high quality soil moisture sensors.

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ZENER DIODE TESTER

ABSTRACT

The testing of zener diodes requires a variable dc power supply. A typical test circuit can be constructed, as shown in figure 4-19. In this circuit, the variable power supply is used to adjust the input voltage to a suitable value for the zener diode being tested. With the zener diode connected no current will flow until the voltage across the diode is equal to the zener voltage. If the diode is ....etc

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in series zener diode data book download

Abstract

A Zener diode allows current to flow from its anode to its cathode like a normal semiconductor diode, but it also permits current to flow in the reverse direction when its Zener voltage is reached. Zener diodes have a highly doped, p-n junction. Normal diodes will also break down with a reverse voltage but the voltage and sharpness of the knee are not as well defined as for a Zener diode. Also normal diodes are not designed to operate in the breakdown region, but Zener diodes can reliably op ....etc

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zener diode working animation ppt

The Zener Diode
In the previous Signal Diode tutorial, we saw that a reverse biased diode blocks current in the reverse direction, but will suffer from premature breakdown or damage if the reverse voltage applied across it is too high.

However, the Zener Diode or Breakdown Diode as they are sometimes called, are basically the same as the standard PN junction diode but are specially designed to have a low pre-determined Reverse Breakdown Voltage that takes advantage of this high reverse voltage. The zener ....etc

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