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Proving Units (28 Products)

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  1. Martindale PD240 pocket Sized Proving Unit - Kit
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    Martindale PD240 pocket Sized Proving Unit for use with Voltage Indicators
    Rating:
    87%
    (1)
    £62.34 £51.95
    • Maximum output current of 2mA
    • Maximum output voltage of 240V
    • Compact body made from flame-retardant ABS for safety
    102 Reward Points
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    SKU: MARPD240
  2. Kewtech KewProve 3 Proving Unit
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    Free UK Delivery*  
    Kewtech KEWPROVE3 Proving Unit for use with Voltage Indicators
    Rating:
    83%
    (2)
    £67.80 £56.50
    112 Reward Points
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    SKU: KEWCB2
  3. Megger MPU690 690v Proving Unit for use with Voltage Indicators
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    Megger MPU690 690v Proving Unit for use with Voltage Indicators
    Rating:
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    £81.60 £68.00
    136 Reward Points
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    SKU: MPU690
  4. Kewtech KTP1 Proving Unit for Non-contact Voltage Testers
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    Kewtech KTP1 Proving Unit for Non-contact Voltage Testers
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    £82.80 £69.00
    • 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
    138 Reward Points
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    SKU: KEWKTP1
  5. Socket & See SP 200 Professional Proving Unit
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    2 in Stock
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    Socket & See SP200 Professional Proving Unit
    Rating:
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    £83.94 £69.95
    • Step voltage indication
    • First proving unit to generate an AC voltage waveform
    • Compact design
    138 Reward Points
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    SKU: SP200
  6. Martindale PD440 440V Proving Unit kit
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    2 in Stock
    Free UK Delivery*  
    Martindale PD440 440V Proving Unit
    Rating:
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    £88.74 £73.95
    • Works with products from other manufacturers
    • Checks for all safety regulations
    • Requires six 1.5 V batteries.
    146 Reward Points
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    SKU: MARPD440
  7. Socket & See VP400 Vehicle Proving Unit
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    Socket & See VP400 Vehicle Proving Unit
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    £89.94 £74.95
    • Designed to be permanently wired into a 12V vehicle supply
    • Optimised for verifying the functionality of multimeters, two-pole voltage indicators and non-contact voltage detectors
    • Generate voltages between 50 and 690V at 50Hz with a true AC waveform
    148 Reward Points
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    SKU: VP400
  8. Socket & See SP400 Proving Unit - Kit
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    Lead Time: 1-6 Days
    Free UK Delivery*  
    Socket & See SP400 Proving Unit
    Rating:
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    £89.94 £74.95
    • Verify the functionality of multimeters, two-pole voltage indicators and non-contact voltage detectors
    • Intelligent voltage ramp: 50V, 100V, 230V, 400V and 690V
    • Able to synthesise tests at an AC mains supply frequency
    148 Reward Points
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    SKU: SP400
  9. Martindale PD690 Proving Unit - Kit
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    In Stock
    Free UK Delivery*  
    Martindale PD690 Proving Unit for use with Voltage Indicators
    Rating:
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    £94.20 £78.50
    156 Reward Points
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    SKU: MARPD690
  10. Fluke PRV240 Proving Unit
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    Fluke PRV240 Proving Unit
    Rating:
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    £98.40 £82.00
    • Generates both AC/DC voltage to 240V
    • LED indicator
    • Ideal for use with clamp meters and multimeters, as well as two-pole voltage testers
    164 Reward Points
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    SKU: 4566209
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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 time 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 afterwards.

Proving units come in many different forms in order to accommodate for 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 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 compromisation of measurement accuracy. Other factors such as knocks and bumps, dust, water and other forms of natural contaminants can also effect the accuracy of a tester over a time period 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 - simply give us a call on the numbers at the top of this page and we'll help you out choosing the right proving unit for use with your voltage tester.

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