Martindale PD690SX 50V/120V/230V/400V/690V AC Proving Unit with CALCHECK

DescriptionMartindale PD690SX 50V/120V/230V/400V/690V AC Proving Unit with CALCHECKProduct Description:The Martindale PD690SX is a premium proving unit designed for safe and compliant electrical testing. Engineered with the needs of modern electricians and testers in mind, the PD690SX not only verifies the operation of voltage indicators before and after use — as required by the Electricity at Work Regulations — but also offers advanced functionality with its CALCHECK feature. This integrated CALCHECK function allows users to verify insulation and low resistance ranges of multifunction installation testers and insulation resistance meters, helping identify potential calibration issues before formal certification or inspection work.This unit outputs stepped voltages precisely aligned with common two-pole tester thresholds, from 50V to 690V AC, and includes LED indicators for each voltage level. It initiates testing at 690V, instantly checking all LEDs on compatible voltage indicators, before automatically stepping down through each voltage level. Additionally, it features individual resistance test pads that help assess continuity and insulation resistance performance, enabling detection of calibration drift.Designed to simplify compliance, testing, and calibration procedures, the PD690SX is a critical companion for electricians working under the 18th Edition standards, as well as for contractors undergoing assessment by electrical regulatory bodies.Key Features:CALCHECK function enables onsite verification of insulation and low resistance ranges on multifunction testers and single function instruments.Stepped AC output voltages at 50V, 120V, 230V, 400V, and 690V — ideal for verifying a wide range of voltage indicators.Instantaneous 690V output to prove full voltage range before stepping down automatically.Built-in continuity check with low resistance appearing at end of proving sequence for verifying two-pole testers.Individual resistance pads (0.5Ω, 1.0Ω, 0.5MΩ, 1.0MΩ) for verifying continuity and insulation resistance functions and detecting calibration drift.Colour-coded for easy matching with Martindale voltage indicators.Supports easy record-keeping of CALCHECK results with included forms and downloadable templates.What’s Included:Martindale PD690SX Proving UnitUser Guide (including CALCHECK record form)Set of 4 reference resistance pads (0.5Ω, 1.0Ω, 0.5MΩ, 1.0MΩ)Protective carry caseBattery (pre-installed)Calibration certificateComparison:PD690SPD440SXPD690SXMaximum Voltage Output690V AC440V AC690V ACLED Voltage Thresholds690V50V, 120V, 230V, 440V50V, 120V, 230V, 400V, 690VHigh Voltage LED✔MultipleMultipleLow Battery LED✔✔✔High/Low Z Compatible✔✔✔CALCHECK Resistance Values✔✔Colour Coded to Match Voltage Indicators✔✔✔Suitable forMultimeters, voltage testers & Drummond test lampsMultimeters, voltage testers & Drummond test lampsMultimeters, voltage testers & Drummond test lamps