Metering Insights

Measurement Uncertainties for Test Benches

A test bench consists of several elements which can introduce additional variable errors.

The Categories for Electrical Measurements

Sometimes you find in specifications terms like CAT III or CAT IV. These terms are given in IEC 61010-1

The Christmas Gimmick 2020

Table Tennis (Pīngpāng qiú 乒乓球) is one of the top National sports in China. As a proof of concept we have remade a very old arcade game.

Energy Meters and Hysteresis

You can find this term in a lot of technical documentations with more or less complicated explanations. We'd like to give some simple examples for the need of hysteresis in...

My meter is running too slow

The end-user had an energy meter with rotating disk (electromechanical). These meters are usually already in the field for more than 30 years.

Energy Saving with Little Helpers?

I recently stumbled over some advertisements related to plug-in or paste devices which are claimed to reduce the electricity bill by an average of 10%.

User Interface Unit Simulator

By now the UIU/CIU short-codes are not unified. We have collected and merged all recent requests.

How Mean is the Value?

CLOU energy meters and test equipment is measuring the true RMS value by waveform sampling. There are other methods, but they are less accurate.

Power Grid Stability and Renewable Energy

With increasing percentage of renewable energy on power generation we will see more disturbances in the grid.

Waveform Sampling for Electrical Measurements

The interactive graphics below shows the impact on sampling rates on different waveforms. The error calculation is based on true-rms for a wave with 360 samples and for training purpose...

The Over- and Under Voltage Disconnection

The phase to neutral supply voltage is controlled by the power generation companies and utilities by using transformers with on-load tap changers. Depending on the region you can find different...

The Over-Current Disconnect Function

Electronic meters with build-in relays can serve for various functionalities. By IEC62052-11 Ed.2 the name for this sort of relays is Supply Control Switch (SCS).