Testing Bench Guide: Voltage Proving Unit Basics

When working with mains electricity supplies, a voltage proving unit is a vital equipment to ensure safe working practices and safe isolation procedures. This portable device has as a function to verify the performance of electrical test tools without compromising safe.

In the market of voltage proving unit, a range of high-quality units are available to provide safe operation of high voltage potential indicators used by maintenance personnel, power and service engineers.

The benefits of voltage proving units are usually neglected, while they are just too big. These simple proving devices are reliable and effective for ensuring safe and proper operation of every piece of electrical equipment. Even in low-voltage systems, insulation checks with voltage proving units are highly recommended and in some cases, they are even a legal requirement.

Ensuring safe working practices is of vital importance, but it can be done only with a reliable device, such as the voltage proving unit. Here are few reasons to use this equipment.

Dependable Results

The first benefit of voltage testers is providing dependable results. When this unit is positioned properly, it can effectively measure insulation resistance. To ensure dependable results, you must use the right type of unit for your application. Once the proving unit is connected to an electrical circuit, it provides immediate readings.

AC And DC Currents

Voltage proving units have the ability to check both AC and DC currents, as you can adjust it to your desired one depending on your needs. Before use, set the meter to the appropriate range and get accurate results.

Maximum Value

When choosing a voltage proving unit, it is very important to examine and consider the load curve. If diagnostic proving is intended, consider the maximum value of insulation resistance that it can measure. Try to find out correct numbers to get maximum benefits of your proving unit.

Verifying The Operation Of A Voltage Proving Unit

  • Select the AC or DC function with the selection switch available on the unit.
  • Place the black probe of the unit under test into the (-) terminal and press down firmly.
  • Place the red test probe of the unit under test in the (+) and press down firmly.
  • Check if the meter reading of the unit is valid for the function tested.
  • If the power indicator led does not illuminate, check the condition of the battery and replace if necessary.
  • It is of extreme importance that you check your voltage proving unit to see if it’s working properly before using it to detect mains live voltages.

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