Global warming has gradually become a topic of discussion after drinking, and it has not only aroused public concern, but the industry has also taken action to promote energy conservation and the use of alternative energy sources. Power consumption reduction measures such as the Energy Conservation Law and Energy Star have put forward requirements for the operation mode of home appliances.
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More and more home appliances are using frequency conversion technology, which also makes the waveform signal of the product distorted while saving energy. Moreover, due to the application of the frequency conversion, the working state is frequently changed during the operation of the home appliance, resulting in a wide range of changes in the working current, and the current can be reduced from several tens of amps to several milliamps. So, what kind of instrument can meet the test and measurement requirements for inverter household appliances such as air conditioners?
Here we take air conditioning as an example, to share with you the difficulty of testing the inverter home appliances?
Test difficulty
1. Frequency conversion appliances save the energy consumption and make the waveform signal of the product easy to be distorted. These distorted waveforms are non-sinusoidal signals, such as pulse waves, triangular waves, rectangular waves, trapezoidal waves, and pulse waves, and are rich in high-frequency harmonic components. Ordinary power meters cannot accurately measure high-frequency components due to sampling rate and bandwidth limitation, so there is a huge gap between their measured values ​​and real values.
2. The general power measuring instrument only allows power measurement under the same range in the integration mode, which cannot meet the correct measurement of the power of the inverter household appliance.
solution
How should we solve these measurement difficulties? Zhou Ligong Zhiyuan Electronics provides you with a reliable solution based on your point of view.
Figure 1 Home and office electrical test chart
The latest PA300 series power meter has the following features:
l Up to 500KS/s sampling rate, 300KHz bandwidth;
l Standard synchronous measurement of harmonics (up to 50 times) and total harmonic distortion (THD), in line with IEC61000-4-7 harmonic measurement standards;
l Automatically switch range in integral mode, support wide current: 50μA~20A range measurement;
l Power measurement accuracy up to 0.1%;
l Standard rich communication interface, USB Host, USB Device, GPIB, RS-232 and Ethernet.
500KS/s sampling rate: According to Nyquist's sampling law, the sampling rate of the instrument is higher than twice the highest frequency of the input signal. The Zhiyuan electronic power meter has a sampling rate of 500KS/s and is capable of measuring the rich harmonics in the distorted waveform.
300KHz bandwidth: A low-bandwidth power meter in which high-frequency components in the signal are filtered out by the analog front-end circuitry, causing energy loss. Zhou Ligong Zhiyuan electronic power meter 300KHz bandwidth fully meets the power consumption measurement of new technology products such as inverter appliances.
Figure 2 Bandwidth home appliance signal and power meter bandwidth relationship diagram
The PA300 series power meter features a new design architecture, multiple optimizations for low power measurement, and higher power factor accuracy, making it ideal for standby power measurement. And up to 50 harmonic analysis functions give you more accurate analysis of waveform quality. At the same time, the series of power meters can automatically switch the range function in the integration mode to ensure the accurate measurement of the frequency conversion appliance power.
Figure 3 Comparison of automatic switching range and fixed range mode
Customer Reviews
The PA300 series power meter has a sampling rate of up to 500KS/s and a bandwidth of 300KHz. It can automatically switch the range function for the integral mode adopted by the inverter home appliance, and supports the input of wide current to provide reliable power measurement for the test of the working power consumption. solution.
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