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Anyone who reads my test reports knows that I like to measure current and voltage or output power between technical devices and their power sources. With power banks, I do this with a small one USB multimeter from PortaPow. For 230 volt consumers, however, I was still missing a precise energy cost measuring device that would also provide low standby energy costs for economical consumers like the Apple HomePod can measure. Most devices that are placed in the socket only measure halfway reliably from a certain consumption and this is often over 10 watts, so that it is difficult to "measure" a HomePod that should only consume 7 watts. I have now found a solution with Voltcraft measuring devices.
An example of the Voltcraft measuring devices is the Voltcraft Energy Logger 4000, which you can use for example buy from Conrad can. The offer there is cheaper than some Ads on Amazon. There is also the Voltcraft Energy Logger 4500 (here.). I tried such a measuring device for a test with my HomePod and came up with a value of 6,9 watts, which is very close to the 7 watts specified by Apple. I think Apple rounded up the value for the indication.
It is also important to note that the Voltcraft devices are TRMS measuring devices. This means that not only a standard value of the direct current is required, but the device takes the actual AC waveform into account (also deviating from sine). According to the product description, distorted phases are not a problem either:
Real effective value measurement (TrueRMS) for the most precise measurement results even with distorted phase positions
The measuring devices record their results in order to keep an eye on consumption and costs and to check whether efforts to reduce costs are successful. That happens locally on one SD Memory Card. Which fits into the respective model can be found in the operating instructions. You can then read it out and draw your conclusions from it on the computer. But the software you need to read the data seems to be a disease.
I have not yet carried out my own test of the app - but if you look at the customer ratings of the device, they are very mixed. However, there is agreement that the device and the accuracy of the measurement results are very good, only the software is extremely difficult to understand and is therefore a reason for devaluation. Anyone who, like me, only wants to reliably measure standby values from 1,5 watts (which do not change) only needs the display integrated in the device;)
If you are looking for a TRMS measuring device to check the standby consumption of your devices at home, in the office or in the whole company, which already works at 1,5 W, then I can recommend the Voltcraft models. Anyone who can dig into the software or who is satisfied with the consumption data on the display can also use the other functions. Compared to AVG or RMS meters, in addition to the AC sine curve and AC, other than sine, any DC influences are measured (AC = alternating current; DC = direct current). Further technical data and details can be found on the Conrad page linked above.
Jens has been running the blog since 2012. He appears as Sir Apfelot for his readers and helps them with problems of a technical nature. In his free time he drives electric unicycles, takes photos (preferably with his iPhone, of course), climbs around in the Hessian mountains or hikes with the family. His articles deal with Apple products, news from the world of drones or solutions for current bugs.