Battery digital display current table wiring method and reason for display

著者：Iflowpower – Provedor de central eléctrica portátil

Digital current table is divided into single-phase digital display and three-phase digital show, which has functions such as transmitting, LED (or LCD) display and digital interface, showing measurements in digital form by digital formation, digital form result. The digital current meter wiring method is as follows: 1, red (black) --- power supply positive, before the relay plus the insurance fuse, the connector switch. 2, white (green)--control box switch 4102, relay control into 1653, the relay controls the negative electrode after the transfer shunt.

3, yellow - relay, the power supply is introduced, plus insurance wire feed voltage, current table positive. 4, green (white)--receive the current table to take electric red line, voltage meter black line, front voltage front negative electrode. 5, black --- (red) call current table to take a negative electrode.

Often some people say "why my digital current is not allowed", what is the reason for incompetence? From the related experience of many years and users, there is a few more reasons for the number of current surfaces. First, how high our accuracy is first, we have to understand that the digital current meter is accurate. Other factors have the same case (note this prerequisite), the higher the accuracy of high precision.

Others - In the case of all conditions, 0.3% accuracy is definitely 0.5%.

But alone is talking about the accuracy is a one-sided, because we all understand the "error = full scale accuracy", the error is related to the full scale,. So connect to the second reason for our second. If there is any selection of the selection range, sometimes more important than the selection accuracy, error = full-scale accuracy, take the Northern Saki DU4 series digital display, this series of precision It is 0.

3%, and we compare the error size of the rules of 500A and 5A through the formulas just now. Range 500A, error = full range * Accuracy = 500A * 0.3% = 1.

5A range 5A, error = full range accuracy = 5A * 0.39% = 0.015A can be seen from the above comparison data, the same accuracy, the smaller range , Smaller the error.

So we often say that the selection of range is more important than the selection accuracy (see how to click on the digital display ". Third, is your DC signal really "DC"? In addition to these factors, there are some uncontrollable factors, which is the "DC AC", which is often said. How to understand? We all understand that the standard "DC signal" is a straight line, it is impossible to have waveforms, but due to "grid pollution" (the impact of large power facilities, the DC signal has an ingredient with communication), or because of the high rectification, Make.

DC signal "has" communication ingredients ", which is the" DC exchange "said in the industry. Conditional users can use one oscilloscope to verify that their DC signal is a straight line. We encounter a lot of customers with a waveform, that is, with exchange ingredients.

If the average value meter is not obvious, the biometric average instrument is displayed to show the average of several measurement results, and the fluctuations will be small, and it can be ignored. But if you use a true valuable instrument, you can clearly see the change in current size. If you use a true value of the digital current table, you think that your digital current meter and the multimeter measurement result are too large, you can detect that your direct current is exchanged.

In addition to the oscilloscope we just said, there is another simple way, transfer the gear position of the multimeter to the AC file. Compare the data measured by the measurement data and the digital current table (must be a true valid value table). If the value is similar, you will show that your "DC signal" is not true DC, but with an exchange ingredient.

Fourth, there is still a case where it has been used for quite long-time, and there is an inconsistent situation after using it. This situation may be due to some other factors. It causes the instrument to have a deviation, as long as the instrument returns to the factory can be re-calibrated.

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