Proving Units (28 Products)
Free DeliveryHD Electric LV-PT Proof Tester for LV-5 Stray Voltage Detectors£240.58 £200.48
400 Reward PointsPrice Match GuaranteeSKU: HD-LV-PT
- Prove the correct operation of LV-5 Stray Voltage Detectors
- Provides a low, non-lethal AC voltage
- Red light indicates the battery is sufficiently charged
Only 1 in Stock£246.48 £205.40Was £309.60 £258.00You Save £63.12 £52.60
410 Reward PointsPrice Match GuaranteeSKU: 4636971
- Bundle pack with proving unit and multimeter
- Ideal pack for electricians
- Save money on buying the two items separately
Free DeliveryHD Electric PT-PRX Proof Tester for PRX Voltage Detectors£309.55 £257.96
514 Reward PointsPrice Match GuaranteeSKU: HD-PT-PRX
- Designed for proving HD Electric PRX Proximity Voltage Detectors
- Generates a high AC voltage
- Designed to be handheld during testing
Free DeliveryHD Electric PT-DVI Proof Tester for DVI Voltage Indicators£309.70 £258.08
516 Reward PointsPrice Match GuaranteeSKU: HD-PT-DVI
- Prove HD Electric’s DVI-100 and DVI-500 Digital Voltage Indicators
- Provides a high AC voltage
- An easy-to-use, effective and efficient proving unit
Free DeliveryHD Electric PT-DET Proof Tester for TAG Voltage Detectors£315.80 £263.17
526 Reward PointsPrice Match GuaranteeSKU: HD-PT-DET
- Prove TAG-200, TAG-200MR and TAG-330 Voltage Detectors up to and including 69kV
- Provides a high AC voltage
- Powered by a 9V lithium/ alkaline-type battery
Free DeliveryHD Electric PT-VP Proof Tester for VP-1 Voltage Probe£330.82 £275.68
550 Reward PointsPrice Match GuaranteeSKU: HD-PT-VP
- Optimised for proving the HD Electric VP-1 Voltage Probe
- Supplies a low AC voltage signal to the probe via the metal electrode
- Powered by a 9V lithium or alkaline-type battery
Free DeliveryHD Electric PT-5000B Voltmeter Proof Tester£658.16 £548.47
1,096 Reward PointsPrice Match GuaranteeSKU: HD-PT-5000B
- Produces 5kV DC at the test leads
- Suitable for verifying that HD Electric’s voltmeters and phasers are operating correctly
- Optimised for checking voltmeters and phasers capable of measuring DC voltages
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.