Are there any AC multimeters which, connected in series between the mains and an appliance, can display the phase angle between the current and voltage applied to the appliance ?
- posted
11 years ago
Multimeters
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- posted
11 years ago
well you can do that with a current sensing probe and an X-Y display on an 2 channel oscilloscope.
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- posted
11 years ago
Some of the plug in power meters will give you a reading of the power factor, or separate readings of W and VA.
There are bits of test equipment that will do what you want, although they are not your typical multimeter...
e.g.
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- posted
11 years ago
Depending on the load, some of the plug-in power meters can do this by giving you the power factor. You would have to know if the load is capacitive or inductive to work out the sign of the phase shift. If the load isn't mainly capacitive or inductive (e.g. a switched mode PSU), then you can't work backwards to the phase shift this way, but the phase shift is normally only interesting for capacitive or inductive loads.
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- posted
11 years ago
Am 09.03.2013 14:21, schrieb Jim Hawkins:
No device, that is _only_ connectet in series between the mains and an appliance can ever measure the phase angle. Without another 1-2 more wires to read the voltage: No way.
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- posted
11 years ago
Go down your local library, they will loan you a "Killawat" plug-in voltage/frequency/current/Kw/Kva etc measuring device very likely. Ours has about twenty of them they loan out like a library book, part of some national initiative.
They also measure power factor. This is the cosine of the angle between volts and amps.
Or go out and buy one, they are about £16
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- posted
11 years ago
The plug-through one I got from Maplin a couple of years ago shows voltage, current, W, VA, power factor, kWh (since plugged in), & elapsed time (since plugged in)
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11 years ago
No what you need is an oscilloscope. grin. Brian
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11 years ago
Who would 'a thunk it?
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or:
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11 years ago
Maybe a daft Q ... but why would 'joe public' need to know pf/phase angle ? He is not going to be able to do anything about it.
OK industrial installs - fair enough you can correct pf, and will be penalised if you don't but domestic bill is the same irrespective of pf
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- posted
11 years ago
2 speakers, 2 dome head mirror screws, laser pointer
NT