Proving Unit PU2/4

Proving Unit PU2/4

The PU2/4 is a battery operated proving unit for testing the health of VI-13700/G, VI-16200 and MTL7 voltage indicators. The apparatus has been designed to tested in accordance with IEC publication 348, Safety Requirements for Electrical Measuring Apparatus.

The PU2/PU4 employs the principle of switched stored energy transfer. When the probe ends of the testing device are inserted into the AC/DC output sockets an oscillating step-up transformer feeds energy from the battery to the load. The low battery voltage is switched on and off at a fast rate and transformed up to provide the required high voltage impulses necessary to fully illuminate all the neon lamps located within the testing devices.

A high switching frequency is chosen to give maximum energy transfer and optimise battery life. When the probe ends of the testing device are withdrawn from the AC/DC output sockets the batteries are disconnected from the circuit and oscillation ceases.

Description

The Proving Unit PU2/4 is a battery operated proving unit for testing the health of VI-13700/G, VI-16200 and MTL7 voltage indicators. The device has been designed in accordance with IEC publication 348, Safety Requirements for Electrical Measuring Apparatus.

The VI-13700/G and VI-16200 are proved healthy if the full complement of neon lamps in the test device illuminates when applied to the PU2/PU4, transposing the Testing Device to verify all indicating elements illuminate. The filament lamp type MTL7 voltage indicating device is proved healthy if the lamp filament glows when applied to the Proving Unit.

When the probe ends of the testing device are inserted into the AC/DC output sockets an oscillating step-up transformer feeds energy from the battery to the load. The low battery voltage is switched on and off at a fast rate and transformed up to provide the required high voltage impulses necessary to fully illuminate all the neon lamps within the testing devices.

Product Features

  • 500V nominal open-circuit voltage, high frequency pulsating D.C. 4KHz nominal
  • Employs the principle of switched stored energy transfer
  • Neon type indicators
  • Combined battery check and output indicator
  • User replaceable Alkaline batteries, 2×9V type MN1704, 6LF22 or equivalent
  • Moulded ABS case

Download the datasheet for the PU2/4 Proving Unit