Velleman-projects EDU06 Assembly instructions Instrukcja Użytkownika Pobierz pdf (Strona 11)

Experiment 4: Rectiﬁ ed AC, single phase

Connection layout:

Connection summary:

GND clip : 4

Probe tip : 5

Purpose:

The purpose of this experiment is to show what single phase rectiﬁ ed AC looks like on a scope screen.

How?:

Turn on the HPS140 Handheld Pocket Scope 1. (see HPS140 manual for How-To instructions).

Place the probe switch “x1/x10” to ‘x1’.2.

Make sure to ﬂ ip SW1 to the correct position3.

Select 5ms/div and 4V/div.

The display will show a signal similar to this one:

A little theory:

With a single diode, we can convert an AC voltage to a DC voltage. As a diode only conducts the

current in one way, only one half of the waveform can pass. The other half, with inverted polarity, is

blocked. As you can see on the screen, the trace shows ‘interruptions’ where the voltage is 0. This is

the part of the AC voltage that is blocked by the diode. If you move the probe clip from test point 5 and

to test point 1, you remove the diode from the circuit and the display shows the complete waveform

again.

NOTES:

Rectiﬁ ed AC, single phase

o a DC voltage As a diode only conducts th

Good to know: Should the rectiﬁ er diode be defective, then you will see either the

complete waveform (if the diode is shorted) or no waveform at all (if the diode is open-

circuit).

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Velleman-projects EDU06 Assembly instructions Instrukcja Użytkownika Strona 11