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Experiment 5: Rectied AC, dual phase

Connection layout:

Connection summary:

GND clip : 4

Probe tip : 5

Purpose:

ThepurposeofthisexperimentistoshowwhatdualphaserectiedAClookslikeonascopescreen

andtoshowthedifferencewithsinglephaserectiedAC.

How?:

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

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

Select 5ms/div and 4V/div.

Astheswitchisstillsettosinglephaserectication,thedisplaywillshowthesametraceas

with experiment 4.

Now,checkwhathappenswhenyouiptheswitchfromsinglephasetodualphaserectication.

Flip the switch back and forward, to clearly see the difference between both settings.

NOTES:

RectiedAC,dualphase

Now,checkwhathappenswhenyouiptheswitchfromsinglephasetodualphaserectication.

Flip the switch back and forward, to clearly see the difference between both settings.

A little theory:

Asyoucansee,the‘interruptions’wehavenoticedwithsinglephaserecticationaregone.Asopposed

tosinglephaserectication,bothhalvesofthesinewaveareused.Insteadofasinglediode,weuse4

diodes to make a ‘diode bridge’

Single diode

Diode bridge

Exercise:

In experiment 3, we have learned how to measure the frequency of a repeating waveform.

Canyoumeasuretheperiodandfrequencyofboththesinglephaseanddualphaserectiedsignal?

(Answer: 10ms/100Hz or 8.33ms/120Hz)

t t

RectiedAC,dualphase