Proving Units
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£17.99 £14.99
- Houses one voltage/continuity tester and a proving unit
- Carrying strap included
- Use the proving unit without removing from the case
14 Reward PointsPrice Match GuaranteeKITBAG3 -
£63.59 £52.99
- Test the functionality of non-contact voltage testers before and after use
- Indicates functionality via a visual LED alert
- Rugged design, drop tested from 1m
52 Reward PointsPrice Match GuaranteeKEWKTP1 -
£74.40 £62.00
- Maximum output current of 2mA
- Maximum output voltage of 240V
- Compact body made from flame-retardant ABS for safety
62 Reward PointsPrice Match GuaranteeMARPD240 -
£75.60 £63.00
- Compact and lightweight
- Suitable for proving high and low impedance instruments
- Inbuilt 200kΩ load limits the current to 3.5mA at 690V
63 Reward PointsPrice Match GuaranteePU690 -
£80.40 £67.0067 Reward PointsPrice Match GuaranteeKEWCB2
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£100.80 £84.00
- Step voltage indication
- First proving unit to generate an AC voltage waveform
- Compact design
84 Reward PointsPrice Match GuaranteeSP200 -
£100.80 £84.00
- 3 ranges
- Switchable AC / DC output mode
- Suitable for use with voltage indicators up to 230V
84 Reward PointsPrice Match GuaranteeMARPD230SRD -
£102.00 £85.0085 Reward PointsPrice Match GuaranteeMPU690
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£106.80 £89.00
- Auto Power Off
- Lightweight, compact, and rugged
- Long battery life
- Low battery indicator
89 Reward PointsPrice Match GuaranteeMARPD440S -
£108.95 £90.79
- Compact and lightweight voltage-proving unit
- AC output up to 690V
- High- and low-Z impedance compatibility
90 Reward PointsPrice Match GuaranteeKANE-PU690V -
£112.80 £94.00
- Single voltage output: 690V AC
- Applies full voltage upon contact
- Auto Power Off function
- Long battery life
94 Reward PointsPrice Match GuaranteeMARPD690S
About Proving Units
Proving units are portable, lightweight calibration tools that are designed for use with two-pole voltage testers. The function of a proving unit is to evaluate that the internal components of the voltage tester are working correctly and that measurement accuracy is maintained.
Although regular, formal calibration is still a priority, using a proving unit in combination with a two-pole voltage tester is an ideal way to ensure measurement accuracy is maintained in the period between official calibration procedures. Most manufacturers recommend that a proving unit is used both before and after testing using a voltage tester; this way, damage to the machine during transportation can be detected before testing, or damage to the machine during the actual testing procedure can be detected afterward.
Proving units come in many different forms to accommodate the vast voltage range spectrum that can be applied to two-pole testers. Some proving units might be designed for measuring low voltage testers, while others may be designed for higher voltage. Some may also be suitable for both low and high-voltage testers, measuring across the entire spectrum. A common function found on these units is ramp voltage. The proving unit applies several different voltages to the two-pole voltage tester that is inserted into ports on the proving unit and the device measures whether everything is working correctly with the applied voltage. The indicators are usually expressed via the use of LED lights and if everything is correct the LED light indicators should tell you that this is the case.
Stepped voltages again vary depending on the proving unit being used.
Using a proving unit to maintain accuracy is particularly important as frequent usage of a tester can result in the compromise of measurement accuracy. Other factors such as knocks and bumps, dust, water, and other forms of natural contaminants can also affect the accuracy of a tester over time and if these inaccuracies go unnoticed it can make the tester unsafe and also produce incorrect readings when used on a system.
Our range of proving units come from many different manufacturers, including Kewtech, Martindale, Megger, Seaward, and Socket and See. As mentioned earlier their capabilities vary from tester to tester, so knowing which unit you need before making a purchase is highly recommended. If you're confused about which unit you need we're more than happy to help you make a decision - get in touch and we'll help you out choosing the right proving unit for use with your voltage tester.