Megger MPU690 User manual

MPU690 Proving Unit
User Guide

Introduction
The MPU690 Proving Unit safely generates high voltages to energise
2 pole voltage testers thus allowing verification of their correct
operation. The unit will also test voltage testers that use a pygmy
lamp.
Features include automatic power on when voltage tester probes are
inserted into the output terminals, 50Hz test voltage to simulate AC
mains supply and a magnetic back to the case.
Instructions
To activate the MPU690 firstly insert the voltage tester flying lead
probe into the right hand terminal followed by the voltage tester fixed
probe into the left hand terminal.
Gently apply and maintain pressure to the left hand probe to activate
the internal power switch. The test voltage is transmitted to the
voltage tester.
The test voltage LEDs will automatically ramp up to 690 volts and then
slowly ramp back down 690 V - 400 V - 230 V - 100 V - 50 V - OFF (to
re-test slightly lift the left-hand probe and re-apply the pressure).
The advantages of the auto test function are:
1. Individual voltages are applied at five key voltage test
points with significant battery savings as power is
automatically switched off when the test is completed.
2. Once the voltage tester has been proved to be correctly
functioning you may carry out testing circuits.
It is recommended that a voltage tester be verified regularly.
GSafety Warnings – Risk of electric shock
Safety Warnings must be read and understood before instrument is
used. As this unit generates voltages up to 690 volts caution should
be exercised, hands should remain behind guards of applied voltage
detectors.
■Never connect to installation wiring.
■Only voltage testers should be connected to the proving unit.
■Never insert wire, nails or screwdrivers into either terminal.
■Do not force objects into the left hand terminal to enable
permanent operation.
■Ensure the unit is free from moisture, grease and dust;
clean unit with a soft dry cloth only.
■Do not use if there is any damage to the MPU690.
■The battery cover must be in place whilst conducting tests.
Note: This instrument must only be used by suitably trained
and competent persons.

Safety Warnings cont.
CATIV Measurement category IV: Equipment connected between
the origin of the low-voltage mains supply outside the
building and the consumer unit.
CATIII Measurement category III: Equipment connected between
the consumer unit and the electrical outlets.
CATII Measurement category II: Equipment connected between
the electrical outlets and the user’s equipment.
End of life disposal
WEEE Directive
The crossed out wheeled bin symbol on the instrument and
on the batteries is a reminder not to dispose of them with
general waste at the end of their life.
Megger is registered in the UK as a Producer of Electrical and
Electronic equipment. The registration no is; WEE/DJ2235XR.
Users of Megger products in the UK may dispose of them at the
end of their useful life by contacting B2B Compliance at www.
b2bcompliance.org.uk or by telephone on 01691 676124.
Users of Megger products in other parts of the EU should contact their
local Megger company or distributor.
Battery Disposal
Batteries in this product are classified as Portable Batteries under the
Batteries Directive. Please contact Megger Ltd for instructions on the
safe disposal of these batteries.
For disposal of batteries in other parts of the EU contact your local
distributor.
Megger is registered in the UK as a producer of batteries. The
registration number is BPRN01235. For Further information see
www.megger.com
Specification
Output Voltage: 50 – 690 volts in five steps
Power Supply: 6 x AA / LR06 alkaline batteries
Operating Conditions: -10 to +40ºC, 70% RH
EN61010 pollution degree 2
Number of tests: Approximately 550
N.B. A voltage tester that uses a pygmy lamp will reduce the
number of tests available due to the drain on the batteries.

Megger Limited
Archcliffe Road,
Dover, CT17 9EN
United Kingdom
Tel [phone]
Email [e-mail]
Web www.megger.com
This instrument is manufactured in China
The company reserves the right to change specification or
design without prior notice.
Megger is a registered trademark
Part No. MPU690_UG_en_V03 06/14