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【Skills】How to measure low voltage?

Issuing time:2018-04-17 14:17

A customer is claiming that his tool doesn't bring the performance shown in the specs: UNIMAT doesn't reach the maximum set temperature / UNIPLAN doesn't weld with full speed / TRIAC doesn't reach temperature / and so on

Many customers complain that the machine is running slowly and the temperature cannot reach the expected value!

In most of these cases “low voltage” is the reason. It can be caused by:

In most cases, it is caused by the supply voltage being too low:

Bad power supply (weak generator, low voltage supply) generator voltage is low

Bad extension cable (too thin, too long, half broken cables) power extension cable is not suitable

Bad junctions (old sockets, old plugs, bad fixation of cable to plug, wrong plugs, no plugs, … )

Too many power tools on one power source    Multiple devices are used simultaneously under one power source


How to measure?

1. The right way

1.jpg


Always measure as close as possible to the tool with a two way adapter while the machine is heating!

Measure the voltage while the device is heating normally! Measure close to the device!

Double plug right before the tool, while it is heating up.

If you measure the voltage just before the tool on load, you can see what voltage the tool gets while working.


2. The wrong way

4.jpg

Don't measure directly at the power supply! Don't measure directly at the power supply !

If low voltage is displayed, you know there is a problem

If the right voltage is displayed, you don't know whether the power supply at the machine is okay or not.

5.jpg

Don't measure directly after at the end of the extension cord!

Do not measure directly at the end of the connecting wire!

If low voltage is displayed, you know there is a problem.

If the right voltage is displayed, you don't know whether the power supply is OK. This can only be tested when the power is under load.


7.jpg


Don't measure with double plug just before the tool without switching it on! Don't measure with the machine not working!

If low voltage is displayed, you know there is a problem.

If the right voltage is displayed, you don't know whether the power supply it is OK. Only measure while machine is heating.


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