Hi
I need q grid quality meter, I could produce in the hundreds to be included in a product
Example of a finished circuit, with schematics and code:
Anyone got an alternative?
Cheers
Klaus
Hi
I need q grid quality meter, I could produce in the hundreds to be included in a product
Example of a finished circuit, with schematics and code:
Anyone got an alternative?
Cheers
Klaus
That uses the ADS131M04, which is a new part not yet at any distributors. However, TI has a few hundred parts at their store. We assume it'll be more widely available soon. Meanwhile their are many alternate qualified and suitable, maybe even better suited AC mains ADCs, including many from Analog Devices. But you mention code. The question is, does that code give you exactly what you need? Or could your programmer better use the source as an example to write something more suited for your needs.
-- Thanks, - Win
Yes, I could reuse the HW and do my own code
It?s not terribly complicated
Ac mains voltage rms Dev from ideal social sine Power factor Peak voltage Peak deviation Surge peak and time Burst peak and count Yada yada yada
Historical data Storage in EEPROM Comm interface Special HW that does not die from surges and measures correctly during abno rmallity
Hmm, seems it won?t be a 2 day dev job ?
Cheers
Klaus
I doubt that TI thing measures transients.
An analyzer as you describe would generate a *lot* of data fast.
Power factor implies that you want to measure your load too. Why not measure power?
-- John Larkin Highland Technology, Inc lunatic fringe electronics
I'd hate to meet an anti-social sine! Heh!
bnormallity
Yes, a lot of data. Would need to sample continously and evaluate continous ly, so as not to miss a transient
We should also measure power, but is far from enough
We have failures from the field that we cannot determine where they come fr om. So the idea is to have correlated grid measurements with field failure data
Cheers
Klaus
abnormallity
usly, so as not to miss a transient
from. So the idea is to have correlated grid measurements with field failur e data
We can measure burst, but not with good quality
Surges are possible with a multi MSa ADC (8/50us pulse)
Cheers
Klaus
You need an analog peak detector for short voltage transients. See AoE III, page 255.
-- Thanks, - Win
There are commercial line quality analyzers around. Rent one of them maybe.
Are the field failures near the power inlet, or signal, connectors? Is there lightning in the area?
-- John Larkin Highland Technology, Inc picosecond timing precision measurement
Yes, a peak detector and a S/H would be needed
Burst can come often, with very high rate (100kHz) and continously. So that will be a worse situation with respect to data than surges, which are rare
Cheers
Klaus
g abnormallity
ously, so as not to miss a transient
from. So the idea is to have correlated grid measurements with field failu re data
We have some of those.
But the failure rate is low, in the 100'reds of ppm, so we need a large pop ulation to get errors. Renting 100'reds of analyzers would be economically unsound and a logistical nigthmare
Cheers
Klaus
Are you sure you need to record the amplitude of every pulse in a burst, isn't it enough to know the most powerful, and the rate? Then you can simulate that in the lab, and design a fix.
-- Thanks, - Win
Search for the "Landis + Gyr" and "E850" to get an impression of the features of a common grid meter.
Wim
I might not need to actually record the bursts, since they are typically not fatal, they just reset the micro
But would be nice to have that included
Cheers
Klaus
Thanks.
It seems they do not record surges and bursts
Cheers
Klaus
If you need one that records surges and similar transients (1us resolution), search for "Siemens" and "Q200" instead.
Regards, Dimitrij
It's not clear if the PQDIF format can contain much 1us information. Can you clarity for us?
-- Thanks, - Win
Restarts are recorded anyway.
Wim
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