Megger MPU690 Proving Unit
Make voltage tester checks straightforward with the Megger MPU690 Proving Unit. This portable, battery-powered voltage source helps you check that a two-pole voltage tester responds correctly before taking a voltage measurement on a circuit.
The MPU690 generates five nominal voltage levels from 50V to 690V. Automatic operation, clear LED indicators and a magnetic base make it a practical addition to your testing kit.
Its output also supports voltage indicators that use a test lamp. A rugged case and compact design help keep the unit convenient to carry and use.
Request a quote for the Megger MPU690 today. Include your voltage tester model with your enquiry to help confirm suitability.
Megger MPU690 Key Features:
- Five voltage steps: Nominal outputs of 50V, 100V, 230V, 400V and 690V.
- Automatic start: The unit switches on when tester probes enter the output terminals.
- Automatic shutdown: The output steps down before the unit switches off.
- 50Hz output: Simulates the frequency of an AC mains supply.
- Test lamp support: Maximum output power of 10W supports lamp-based voltage indicators.
- Clear indication: Five LEDs show the voltage stages, with a separate power indicator.
- Battery status: The power LED also indicates exhausted batteries.
- Practical construction: A rugged case and magnetic base support convenient use.
Why choose the Megger MPU690?
✓ Check your tester against an external voltage source
A voltage tester’s self-test does not necessarily confirm that it will indicate an applied voltage correctly, particularly above 50V.
The MPU690 provides a separate voltage source to check the tester’s response. Its five output stages let you observe the tester as the applied voltage changes.
✓ Keep the checking process simple
There is no separate power-on step. Inserting the probes starts the output sequence automatically.
The LED indicators show which voltage stage is active. This makes the sequence easier to follow while you check the voltage tester.
✓ Keep a portable source in your kit
The MPU690 runs on six AA alkaline batteries. Its magnetic base offers convenient positioning, while the rugged housing suits a portable testing accessory.
Megger highlights extended battery life, alongside sufficient output power for checking suitable test lamps.
At 346g, with dimensions of 130 × 68 × 48mm, it is practical to carry alongside your voltage tester.
How Does the Megger MPU690 Work?
The unit starts automatically when the voltage tester probes are inserted into its output terminals.
It first generates a nominal 690V output. After a short period, the voltage steps down through 400V, 230V, 100V and 50V before switching off.
An LED identifies each voltage stage. The separate power LED also alerts you when the batteries are exhausted.
What Comes with the Megger MPU690?
- Megger MPU690 proving unit, part number 1001-561.
Specifications:
| Feature | Specification |
| Part number | 1001-561 |
| Nominal output voltages | 50V, 100V, 230V, 400V and 690V |
| Output frequency | 50Hz |
| Maximum output power | 10W |
| Power-on | Automatic when probes are inserted |
| Power-off | Automatic |
| Voltage indicators | Five LEDs |
| Power indication | Separate LED with exhausted-battery indication |
| Power supply | Six AA/LR06 alkaline batteries |
| Base | Magnetic |
| Operating temperature | −10°C to +40°C |
| Humidity | 70% RH |
| Dimensions | 130 × 68 × 48mm |
| Weight | 346g |
❓ Frequently Asked Questions (FAQ)
Q1: What is the Megger MPU690 used for?
A. It provides a portable voltage source for checking the operation of two-pole voltage testers and suitable lamp-based voltage indicators.
Q2: Can I use the MPU690 with a multimeter?
A. Megger does not recommend the MPU690 for use with multimeters.
Q3: Does it start at 50V?
A. It starts at a nominal 690V, then steps down through the lower voltage stages before switching off.
Q4: Can it check test lamps?
A. Yes. Its output power and terminal spacing allow it to check voltage indicators that use a lamp.
Q5: Does the MPU690 need a mains power supply?
A. No. It uses six AA/LR06 alkaline batteries. Its 50Hz output simulates the frequency of an AC mains supply, giving you a portable source for checking your voltage tester during work on site.
Q6: How do I know when the batteries need replacing?
A. The separate power indicator LED also shows when the batteries are exhausted.
Request your Megger MPU690 quote and discuss the proving unit you need for your voltage tester.