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Help:Phase Measurement Procedure for DUT

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Oluvision

New Member
I need a explaination/schematics of how to measure the phase angle between the V and I of a DUT over a long range of frequency.

I am trying to construct a Vector Impedance Meter for my Senior Design Project. I am stuck on how to measure the phase angle. I try reading a couple of journals, but they never explain how to measure the phase angle.
 

Russlk

New Member
I thot I already answered this. Put a resistor in series to measure the current, use the voltage across the device as the other measurment. Square up the voltage signals, put them thru an XOR gate, voila! phase angle.
 

Oluvision

New Member
Thanks for your answer. But an XOR gates gives a standard pulse (Logic 0 or 1). How is the output going to reflect the phase angle, considering the standard pulse the XOR gates gives.
 

ljcox

Well-Known Member
Phase angle measurement

The mark/space ratio of the output of th XOR gate is porportional to the phase angle.

Connect it to an averaging circuit to extract the average DC level (the average DC level is porportional to the phase angle).

I can send you a circuit tomorrow when I arrive home.

Len
 

ljcox

Well-Known Member
Phase Detector

This is an extract from a circuit I designed for 50 Hz signals, so you may need to make some changes for your purpose.

Note that D4 prevents a reverse current into the meter.

Also note that the sign of the phase is not indicated. To detect the sign, a D Type bistable is required.

Len
 

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