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Discussion Groups | BasicX | Measuring Current
Discussion forum for the BasicX family of microcontroller chips.
Measuring Current - p_dubinsky - Apr 21 8:50:46 2007
Does anyone know a way to measure single phase 220V current? More
specifically, I need to determine if a device that uses 220V single
phase is turned on and drawing current and I can't get to the innards
of the device.
TIA,
paul
(You need to be a member of basicx -- send a blank email to basicx-subscribe@yahoogroups.com )
specifically, I need to determine if a device that uses 220V single
phase is turned on and drawing current and I can't get to the innards
of the device.
TIA,
paul
(You need to be a member of basicx -- send a blank email to basicx-subscribe@yahoogroups.com )
RE: Measuring Current - Ken Strauss - Apr 21 11:19:54 2007
Clipon ammeters are readily available. They frequently use a toroid that can
be split and then reclosed around one of the input leads. See
http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=42397 for a
picture and description of a typical low cost version.
> -----Original Message-----
> From: b...@yahoogroups.com [mailto:b...@yahoogroups.com] On Behalf Of
> p_dubinsky
> Sent: Saturday, April 21, 2007 8:49 AM
> To: b...@yahoogroups.com
> Subject: [BasicX] Measuring Current
>
> Does anyone know a way to measure single phase 220V current? More
> specifically, I need to determine if a device that uses 220V single
> phase is turned on and drawing current and I can't get to the innards
> of the device.
>
> TIA,
> paul
> Yahoo! Groups Links
>
(You need to be a member of basicx -- send a blank email to basicx-subscribe@yahoogroups.com )
be split and then reclosed around one of the input leads. See
http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=42397 for a
picture and description of a typical low cost version.
> -----Original Message-----
> From: b...@yahoogroups.com [mailto:b...@yahoogroups.com] On Behalf Of
> p_dubinsky
> Sent: Saturday, April 21, 2007 8:49 AM
> To: b...@yahoogroups.com
> Subject: [BasicX] Measuring Current
>
> Does anyone know a way to measure single phase 220V current? More
> specifically, I need to determine if a device that uses 220V single
> phase is turned on and drawing current and I can't get to the innards
> of the device.
>
> TIA,
> paul
> Yahoo! Groups Links
>
(You need to be a member of basicx -- send a blank email to basicx-subscribe@yahoogroups.com )
Re: Measuring Current - Tom Becker - Apr 21 11:54:23 2007
> ... determine if a device that uses 220V single phase is turned on...
Three ways I can think of at the moment:
- a current transformer, like a clamp-on AmProbe or similar, is just a
transformer that uses a load conductor as the primary coil; if the load
current is high, simply several turns of wire around a load conductor
can be rectified and smoothed to make a control signal; smaller currents
might need a transformer core (try a toroid) or signal amplification;
- a series shunt, which is a small resistance that will develop a
voltage when current passes through it; potentially dangerous since one
side of the shunt is connected to the AC line, you'll need to safely
isolate the resulting voltage;
- it took too long to get to this point, so I forgot the third.
Actually, do some searching among home-automation products. I think I
recall a hot-water heater current sensor somewhere.
Tom
(You need to be a member of basicx -- send a blank email to basicx-subscribe@yahoogroups.com )
Three ways I can think of at the moment:
- a current transformer, like a clamp-on AmProbe or similar, is just a
transformer that uses a load conductor as the primary coil; if the load
current is high, simply several turns of wire around a load conductor
can be rectified and smoothed to make a control signal; smaller currents
might need a transformer core (try a toroid) or signal amplification;
- a series shunt, which is a small resistance that will develop a
voltage when current passes through it; potentially dangerous since one
side of the shunt is connected to the AC line, you'll need to safely
isolate the resulting voltage;
- it took too long to get to this point, so I forgot the third.
Actually, do some searching among home-automation products. I think I
recall a hot-water heater current sensor somewhere.
Tom
(You need to be a member of basicx -- send a blank email to basicx-subscribe@yahoogroups.com )
Re: Measuring Current - stevech11 - Apr 21 12:29:14 2007
www.crmagnetics.com - they have several dozen split-core transformers.
You wrap this around a conductor. The transformer's output,
proportional to the amount of current flowing, is fed to one of many
of their sensors, such as an LED driver for on/off, an analog signal
conditioner for voltage vs. current, a microprocessor with a PC
interface, and so on. The home automation guys on homeseer.com use a
simple version for sensing on/off of TVs and the like.
--- In b...@yahoogroups.com, "p_dubinsky" wrote:
>
> Does anyone know a way to measure single phase 220V current? More
> specifically, I need to determine if a device that uses 220V single
> phase is turned on and drawing current and I can't get to the innards
> of the device.
>
> TIA,
> paul
>
(You need to be a member of basicx -- send a blank email to basicx-subscribe@yahoogroups.com )
You wrap this around a conductor. The transformer's output,
proportional to the amount of current flowing, is fed to one of many
of their sensors, such as an LED driver for on/off, an analog signal
conditioner for voltage vs. current, a microprocessor with a PC
interface, and so on. The home automation guys on homeseer.com use a
simple version for sensing on/off of TVs and the like.
--- In b...@yahoogroups.com, "p_dubinsky"
>
> Does anyone know a way to measure single phase 220V current? More
> specifically, I need to determine if a device that uses 220V single
> phase is turned on and drawing current and I can't get to the innards
> of the device.
>
> TIA,
> paul
>
(You need to be a member of basicx -- send a blank email to basicx-subscribe@yahoogroups.com )
Re: Measuring Current - rosa...@aol.com - Apr 21 13:20:42 2007
Hi,
Attached is a link for current sensors. Hope this is what your looking.
http://www.ampsolution.com/100A%20Current%20Sensors.html
rosarite
-----Original Message-----
From: p...@flxent.com
To: b...@yahoogroups.com
Sent: Sat, 21 Apr 2007 8:48 AM
Subject: [BasicX] Measuring Current
Does anyone know a way to measure single phase 220V current? More
specifically, I need to determine if a device that uses 220V single
phase is turned on and drawing current and I can't get to the innards
of the device.
TIA,
paul
________________________________________________________________________
AOL now offers free email to everyone. Find out more about what's free from AOL at AOL.com.
[Non-text portions of this message have been removed]
(You need to be a member of basicx -- send a blank email to basicx-subscribe@yahoogroups.com )
Attached is a link for current sensors. Hope this is what your looking.
http://www.ampsolution.com/100A%20Current%20Sensors.html
rosarite
-----Original Message-----
From: p...@flxent.com
To: b...@yahoogroups.com
Sent: Sat, 21 Apr 2007 8:48 AM
Subject: [BasicX] Measuring Current
Does anyone know a way to measure single phase 220V current? More
specifically, I need to determine if a device that uses 220V single
phase is turned on and drawing current and I can't get to the innards
of the device.
TIA,
paul
________________________________________________________________________
AOL now offers free email to everyone. Find out more about what's free from AOL at AOL.com.
[Non-text portions of this message have been removed]
(You need to be a member of basicx -- send a blank email to basicx-subscribe@yahoogroups.com )