Power meter with 10-20 measurements/sec - do such things exist?

[Dmitry Anikin]

Hi
I need a digital power meter (preferably) with clamp jaw, measuring AC power of 2-15 kW / 220 V,
single phase, at a rate of no less than 10 times / sec (ideally - 20 times). It should connect to
PC.
All devices i've seen measure at most 2 times / sec. I even bought a protek 307 which
measures 14 times/sec as manual says, but still it transfers data to PC only 2 times/sec.
I need to monitor with high time resolution power consumption of a motor on a
grinding machine during a work cycle of 2 - 3 seconds.
Accuracy is not an issue at all.
Any suggestions?

 

[Jon Elson]

Hi
I need a digital power meter (preferably) with clamp jaw, measuring AC
power of 2-15 kW / 220 V,
single phase, at a rate of no less than 10 times / sec (ideally - 20
times). It should connect to PC.
All devices i've seen measure at most 2 times / sec. I even bought a
protek 307 which
measures 14 times/sec as manual says, but still it transfers data to
PC only 2 times/sec.
I need to monitor with high time resolution power consumption of a
motor on a
grinding machine during a work cycle of 2 - 3 seconds.
Accuracy is not an issue at all.
Any suggestions?

Dranetz? Or Tektronix digital storage oscilloscope with current probe, that
will do it for sure. If you really need power, you can probably get one
of their
scopes to do the instantaneous real power conversion with their math
function.

Jon

 

[Marthein Plat]

Hello Dimitri,

You could do this with an oscilloscope from TiePie engineering (
http://www.tiepie.com ), a Dutch company manufacturing many different
PC-based oscilloscopes.

I think you will find the Handyscope HS3, HS4 and HS4 DIFF interesting. See:
http://www.tiepie.com/uk/products/External_Instruments/USB_Oscilloscope.html
.. These are 2 and 4 channel USB oscilloscopes.

When you use one of the channels to measure the voltage and an other channel
to measure to measure the current with a current probe, you can multiply the
two measurements to get the power. You can do this with the TiePie Multi
Channel software that comes with the instruments. You can record this power
measurement directly to disk or collect up to 20 million samples on screen.

All of the above instruments are capable of performing 10000 samples per
samples per second, so your 20 times per second is easily possible.

Best regards,

Marthein