Martindale PD440SX 440V AC Proving Unit

Martindale PD440SX 440V AC Proving Unit

The Martindale PD440SX 440V AC Proving Unit helps electricians confirm that voltage indicators and test lamps are working correctly before and after use. It delivers a fast proving sequence and gives clear confirmation of instrument operation. Its compact design makes it easy to carry between jobs and use in confined spaces.

Built for demanding environments, the Martindale PD440SX 440V AC Proving Unit features a rugged overmoulded casing that stands up to regular site use. It also includes a high-strength magnetic hanger for hands-free operation. As a result, users can position the unit securely while carrying out safe isolation procedures.

Reliable Voltage Proving

Stepped output voltages of 50V, 100V, 230V and 440V provide compatibility with a wide range of voltage indicators and multifunction testers. Individual LED indicators clearly display each voltage threshold and make the proving process simple to follow. In addition, the unit instantly outputs the highest voltage before stepping down automatically.

CALCHECK Verification

A key feature of the Martindale PD440SX 440V AC Proving Unit is the integrated CALCHECK function. This allows users to verify insulation and continuity tester resistance ranges and helps identify possible calibration drift. Consequently, instruments can be checked regularly to maintain confidence in test results.

The proving unit operates from six AA batteries and offers long battery life with a low battery indicator. Its low profile shape fits easily into a tool bag and keeps weight to a minimum. Furthermore, the simple controls allow quick proving checks with very little setup time.

Two set options are available to suit different requirements, allowing users to choose the most suitable package for their testing equipment. Whether used with multifunction installation testers, voltage indicators or test lamps, the Martindale PD440SX 440V AC Proving Unit delivers dependable performance and supports safe electrical working practices in accordance with the Electricity at Work Regulations.

Key Features

• Proves voltage indicators and test lamps up to 440V AC
• Integrated CALCHECK function for tester verification
• Stepped voltage outputs of 50V, 100V, 230V and 440V
• Instant high voltage output followed by automatic stepping
• Individual LED indicators for each voltage threshold
• Suitable for multifunction testers and installation testers
• Compatible with high and low impedance indicators
• Rugged overmoulded housing for site use
• Supplied with a high-strength magnetic hanger
• Fast proving response for efficient testing
• Long battery life with low battery warning
• Compact and lightweight low profile design
• Supports safe isolation procedures
• Helps meet Electricity at Work Regulations requirements

Technical Specifications

Comparison Table

Document Downloads

What’s Included

• Martindale PD440SX 440V AC Proving Unit
• MAG3 high-strength magnetic hanger
• Six AA batteries
• User documentation