Test of the minimum power measurable by different wattmeter sockets

[Petrus]

It is 10x more sensitive, so the minimum power is 0,68W.
I'll also try running the current the other way to see how the different counters behave. I'm going to use my secure suicide cable (personal concept) that I had made to savagely inject current into an isolated circuit. It is a male / male cable with a neon light on each side and a double switch in the middle:

cable suicide.JPG (273.29 KiB) Viewed 741 times

[Petrus]

I did the tests with the voltage and current measurements by multimeters:

measurements.JPG (225.28 KiB) Viewed 681 times

Xavax EMG-7:
- 25W bulb: measurement taken = 26,1W multimeter measurement = 232V*0.109A = 25,3W (+3,2%)
- 100W bulb: measurement taken = 101,6W multimeter measurement = 234V*0.419A = 98W (+3,7%)
-Blowing 1000W: measurement taken = 1017,1W multimeter measurement = 230V*4,26A = 980W (+3,8%)
-Blowing 2000W: measurement taken = 1949,6W multimeter measurement = 227V*8,28A = 1880W (+3,7%)

IDK MPM-70:
- 25W bulb: measurement taken = 24W multimeter measurement = 230V*0,109A = 25W (-4%)
- 100W bulb: measurement taken = 93W multimeter measurement = 232V*0,416 = 96,5W (-3,6%)
-Blowing 1000W: measurement taken = 920W multimeter measurement = 226V*4,19A = 947W (-2,9%)
-Blowing 2000W: measurement taken = 1763W multimeter measurement = 223V*8,14A = 1815W (-2,9%)

Voltcraft:
- 25W bulb: measurement taken = 24,6W multimeter measurement = 230V*0.109A = 25W (-1,6%)
- 100W bulb: measurement taken = 95,1W multimeter measurement = 230V*0.417A = 95,9W (-1,9%)
-Blowing 1000W: measurement taken = 959,3W multimeter measurement = 228V*4,24A = 967W (-0,7%)
-Blowing 2000W: measurement taken = 1830W multimeter measurement = 224V*8,22A = 1841W (-0,5%)

Paget:
- 25W bulb: measurement taken = 24W multimeter measurement = 231V*0.109A = 25,2W (-4,7%)
- 100W bulb: measurement taken = 96W multimeter measurement = 232V*0.421A = 97,7W (-1,7%)
-Blowing 1000W: measurement taken = 940W multimeter measurement = 229V*4,26A = 976W (-3,7%)
-Blowing 2000W: measurement taken = 1761W multimeter measurement = 225V*8,21A = 1847W (-4,7%)

Otax:
- 25W bulb: measurement taken = 24W multimeter measurement = 232V*0.109A = 25,3W (-5,1%)
- 100W bulb: measurement taken = 95W multimeter measurement = 230V*0.419A = 96,4W (-1,5%)
-Blowing 1000W: measurement taken = 965W multimeter measurement = 227V*4,22A = 958W (+0,7%)
-Blowing 2000W: measurement taken = 1849W multimeter measurement = 224V*8,19A = 1835W (+0,8%)

Injection tests:
Xavax EMG-7: power measurement and positive counting
IDK MPM-70: wrong power
Voltcraft: 0W
Paget: 0A, 0W
Otax: power measurement and positive counting
Brennenstuhl PM230: power measurement and positive metering

[izentrop]

You can make measurements with reactive component like capacitor and resistor in series

The old power supplies with transformer have a lot of no-load losses. This one for example

[sicetaitsimple]

I did the tests with the voltage and current measurements by multimeters:
measurements.JPG

Doesn't all sound that different to me, does it? Finally not to the point of starting a debate, it seems to me.

[dede2002]

It's always comforting when you see that all the devices measure the same thing

I think that by trying with other consumers (those in the test are all "ohmic") such as led bulbs, fluorescent tubes, or other modern devices, the results will be different. I had a 3W led spot which consumed 80mA (fp 0.18), or the day before my washing machine which consumed 40mA for 1.3W. (fp 0.13)...

[Petrus]

Indeed, I used resistive consumers to be able to compare them with the voltage and current measurements of the multimeters.
With consumers more complex to measure the difference could be greater.
I will continue testing with other consumers:
- LED bulb with capacitor power supply
- LED bulb with electronic power supply
- compact fluorescent bulb
- vacuum transformer

[izentrop]

the day before my washing machine which consumes 40mA for 1.3W. (fp 0.13)...

When is it from? https://commission.europa.eu/energy-cli ... arr%C3%AAt.

[dede2002]

the day before my washing machine which consumes 40mA for 1.3W. (fp 0.13)...

When is it from? https://commission.europa.eu/energy-cli ... arr%C3%AAt.

Not old! (this is not the kind of machine made to last long).

P1370333.JPG (100.1 KB) Viewed times 611

I don't know, it was given to me, but I'm not in Europe...

[izentrop]

Lying ? Cons. in stop mode (off): 0.5 W https://www.electromenager-compare.com/ ... 2WFR-N.htm

Manufacturer Whirlpool? https://whirlpool-cdn.thron.com/static/ ... ZHXCSB.pdf

[dede2002]

This is what I measured, on or off it does not change anything, the consumption of the small LED does not influence the measurement.

I put the photos of the measurement here:
electricity-electronics-computer/hidden-consumption-washing-machine-t2429-30.html