Measuring AC voltage
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Posts: 46,084
Any good information for measuring AC voltage and current, in the
range of 90 -130, and current from 0 - 10 amps
volts. We want to use a basic stamp II, to monitor a well pump, to
see if one leg is drawing more current, and keep a record of high and
low voltage.
range of 90 -130, and current from 0 - 10 amps
volts. We want to use a basic stamp II, to monitor a well pump, to
see if one leg is drawing more current, and keep a record of high and
low voltage.
Comments
CURRENT. RATED AT 10 AMPS PUTS OUT A VOLTAGE PROPORTIONAL TO CURRENT.
THEY ARE $3.25 EAch. THEY ALSO HAVE A 5 AMP MODEL.
WARNING. DO NOT RUN THIS DEVICE WITH OUT A LOAD AT THE OUTPUT.
VOLTAGE WILL GO DANGEROUSLY HIGH. USE A LOW RESISTANCE LOAD......
LASTLY CHECK CALIBRATION AGAINST A SERIES AC AMMETER OR A CLAMP ON
AMMETER.
PUT ONE ON EACH LEG. I ASSUME YOU WANT TO FIND OUT IF YOU HAVE A
CURRENT LEAKAGE FROM ONE SIDE OF THE LINE TO GROUND WATER.
73 SPENCE, K4KEP
--- In basicstamps@y..., "rkremers" <rogerk@c...> wrote:
> Any good information for measuring AC voltage and current, in the
> range of 90 -130, and current from 0 - 10 amps
> volts. We want to use a basic stamp II, to monitor a well pump, to
> see if one leg is drawing more current, and keep a record of high
and
> low voltage.
through it.
doing this will mean that there is no voltage output from the CT during
normal conditions
Then if one wire is carrying more current than the other the CT will see
this as current flow and give an output proportional to the current
difference between the 2 wires.
Might be a little cheaper and simpler to do.
I am not familiar with the exact device described, but if this device is a
true CT it will actually put out an AC current proportional to input current
and this may then be converted to voltage by passing the current through a
resistance.
The output will still be AC and may need further filtering before shoving
into the stamp.
Transducers are quite easily available that convert AC Voltage or current
into 4-20mA outputs which can be converted to voltage for feeding into the
stamp.
Doing it this way though will not be cheaper...
Garry
Original Message
From: k4kep [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=9JbEjDY3KkQkz5pbKlPl29lY3YPdqnf9h08xmS4Z59DLSy8yVuextPtxGRnsEpfLV7dAA6EThnTBuw]k4kep@y...[/url
Sent: 21 January 2002 18:05
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] Re: Measuring AC voltage
JAMECO.COM PART NUMBER 174895 CURRENT TRANSFORMER FOR MEASURING
CURRENT. RATED AT 10 AMPS PUTS OUT A VOLTAGE PROPORTIONAL TO CURRENT.
THEY ARE $3.25 EAch. THEY ALSO HAVE A 5 AMP MODEL.
WARNING. DO NOT RUN THIS DEVICE WITH OUT A LOAD AT THE OUTPUT.
VOLTAGE WILL GO DANGEROUSLY HIGH. USE A LOW RESISTANCE LOAD......
LASTLY CHECK CALIBRATION AGAINST A SERIES AC AMMETER OR A CLAMP ON
AMMETER.
PUT ONE ON EACH LEG. I ASSUME YOU WANT TO FIND OUT IF YOU HAVE A
CURRENT LEAKAGE FROM ONE SIDE OF THE LINE TO GROUND WATER.
73 SPENCE, K4KEP
--- In basicstamps@y..., "rkremers" <rogerk@c...> wrote:
> Any good information for measuring AC voltage and current, in the
> range of 90 -130, and current from 0 - 10 amps
> volts. We want to use a basic stamp II, to monitor a well pump, to
> see if one leg is drawing more current, and keep a record of high
and
> low voltage.
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