True RMS, why is so important to clamp table?

When choosing clamp table, the most commonly heard most of the problems is how "accuracy", "no".There are many factors influencing the accuracy of the clamp table, design/work, bandwidth, frequency response, including whether to choose a suitable range, all can affect reading.All of these factors, however, one of the most important factors, is the true effective value measurements, especially on the variety of electric equipment, electric environment complex industrial users.

The true effective value, i.e., the average response of the instrument, mainly for the standard of power frequency sine wave measurement.Common principle, which is the arithmetic average of the measured reading x1.1, into sine wave 'valid' readings.In the electrification of the environment is pure environment, this is completely no problem, such as building estate, etc.

And wider industrial environment, especially a growing number of inverter, rectifier, inverter and other equipment, the use of the actual waveform is more and more diversified, and even the introduction of more and more high frequency noise, thus more accurate measurements, true RMS become one of the most important factor.

Let's take a look at the following diagram of the second understand:

Mention noise or the harmonic, have to say to another important concept: low pass filter (LPF).The implication, only the low frequency current voltage to be measured, the high frequency part will be ended will not be calculated., so to speak, only to have the true RMS of the low-pass filter clamp table, is the real valuable 'true RMS'.

Fluke true RMS clamp table, all is true RMS雷竞技app clamp table * are equipped with 800-900 hz low-pass filter, some models such as 369/368, Fluke ember ACD - 14 PRO is equipped with 60 ~ 70 hz by power frequency of the low-pass filter (BP)(* only F - 323, T6 series not configured).

Given the true effective value is so important to clamp table fluke special launched this year

F325/324/323 series 400 a true RMS clamp table

Fluke clamp table on the true effective value choice is very rich:

From the entry level of 400 aF323/4/5Series, the mainstream of ac/dc 600 a / 1000 aF317/9With wireless split screen and 2500 a large current coil's flagshipF381

Ha雷竞技appve FlukeConnect wireless data capacity and temperature probe functionF902FC

Top 1 ua resolution high-precision ac leakage current seriesFc F369/368/369/368 fc;

Separable small jawF365, and can beJaw directly measure the voltageThe black science and technologyT6Series.