mbrooke
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Why do I have the option between these two types? What are the pros and cons of each? When and where would I use each kind?
Iron Vane vs Rectifier Meters
- Thread starter mbrooke
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LarryFine
Master Electrician Electric Contractor Richmond VA
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- Henrico County, VA
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You posted a catalog. Which two?
mbrooke
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Page 5 and page 6
winnie
Senior Member
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- Electric motor research
Very cool.
I didn't know that such meters were still available new and in different varieties, and so cannot offer any opinions on which approach is better for what application.
However page iv might help.
-Jon
I didn't know that such meters were still available new and in different varieties, and so cannot offer any opinions on which approach is better for what application.
However page iv might help.
-Jon
LarryFine
Master Electrician Electric Contractor Richmond VA
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- Henrico County, VA
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- Electrical Contractor
Some results using your thread title as the search term:
en.wikipedia.org
engineer-educators.com
Current clamp - Wikipedia
en.wikipedia.org
Indicating Alternating Current
Another problem encountered in measuring ac is that the meter movement reacts to the average value of the ac. The value used when working with ac is the effective value (rms value). Therefore, a different scale is used on an ac meter. The scale is marked with the effective value, even though it...
www.tpub.com
AC Measuring Instruments - Mypdh.engineer
Concepts for Advanced Electrical Knowledge & Practical Troubleshooting AC Measuring Instruments Previous Lesson Back to Course
engineer-educators.com
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- Placerville, CA, USA
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- Retired PV System Designer
Since the torque on an iron vane is proportional to the square of the magnetic field, and hence the square of the current, the scale of an iron vane meter will be non-linear with a loss of precision at the low end of the scale. Although some compensation for this non-linearity can be implemented by controlling the shape of the moving vane, it is still difficult to get good sensitivity at the low end of the range.
So for low current resolution comparable to that of a rectifier meter you really need to implement range switching, by changing either shunt resistance or CT ratio.
So for low current resolution comparable to that of a rectifier meter you really need to implement range switching, by changing either shunt resistance or CT ratio.
How sensitive do you want the meter to be?
you measuring amps or micro amps?
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- Placerville, CA, USA
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- Retired PV System Designer
Right. A rectifier meter requires a minimum voltage drop which depends on the forward voltage of the rectifier technology used. At some point you will need to include an op-amp to get around this.
mbrooke
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mbrooke
Batteries Included
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Still confused.
mbrooke
Batteries Included
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- United States
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Some results using your thread title as the search term:
Current clamp - Wikipedia
Indicating Alternating Current
Another problem encountered in measuring ac is that the meter movement reacts to the average value of the ac. The value used when working with ac is the effective value (rms value). Therefore, a different scale is used on an ac meter. The scale is marked with the effective value, even though it...www.tpub.com
AC Measuring Instruments - Mypdh.engineer
Concepts for Advanced Electrical Knowledge & Practical Troubleshooting AC Measuring Instruments Previous Lesson Back to Course
Neat- seams like iron vanes do better in high powered circuits. Still wondering why the catalog offers both for high current applications.
mbrooke
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I didn't know about the different varieties either lol. At least not iron vs rectifier.
While you might not see it day to day, in some parts of the world and in some special applications/clients EM meters and relays are still the norm in greenfields.
In China brand new coal plants still use relay logic and needle relays.
qcroanoke
Sometimes I don't know if I'm the boxer or the bag
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- Sorta retired........
I was just going to post that very thing.....
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