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

Martindale

£117.00 / £140.40 incl VAT

⚡ CALCHECK function enables pre-certification verification of tester calibration on-site
⚡ Stepped voltage outputs from 50V to 690V with LED indicators for each level
⚡ Instant 690V output for full voltage verification at test start
⚡ Built-in continuity test using low resistance simulation at test en
⚡ Reference resistance pads to detect calibration drift in insulation and continuity testers

Available on back-order

Add Calibration to your Proving Unit.

SKU: MAR-PD690SX Category: Brand:

Description

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

Product 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 Unit
  • User Guide (including CALCHECK record form)
  • Set of 4 reference resistance pads (0.5Ω, 1.0Ω, 0.5MΩ, 1.0MΩ)
  • Protective carry case
  • Battery (pre-installed)
  • Calibration certificate

Comparison:

PD690SPD440SXPD690SX
Maximum Voltage Output690V AC440V AC690V AC
LED Voltage Thresholds690V50V, 120V, 230V, 440V50V, 120V, 230V, 400V, 690V
High Voltage LEDMultipleMultiple
Low 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

Specifications

Output voltage690/230/100/50V nominal
Output frequency50Hz nominal
Output loadingSee datasheet
CALCHECK insulation test resistance0.5MΩ (max test voltage 1kV)
1.0MΩ (max test voltage 1kV)
CALCHECK continuity test resistance0.5Ω (max test current 200mA)
1.0Ω (max test current 200mA)
Temperature (Operating & Storage)-10°C to 40°C
Humidity (Operating & Storage)max. 70% R.H.
Altitudeup to 2000m
Pollution Degree2
Power6 x 1.5V, AA alkaline batteries (IEC LR6, NEDA 15A)
Dimensions150 x 80 x 35mm
Weight350g approx. with batteries

🚚 Testersmans Shipping Policy

Free Mainland GB Delivery Over £150

We offer free delivery on most mainland Great Britain orders over £150 (ex VAT).
This applies across England, Wales, and most of Scotland, excluding certain remote or offshore postcodes.

If your order total falls just short of £150, or you’re a returning customer, feel free to contact us — we may be able to offer a discount code or delivery workaround.
📞 01945 738112 | ✉️ [email protected]


📦 UK Delivery Options

We work with both Royal Mail and DHL to offer reliable and flexible delivery across the UK:

  • Royal Mail – Best suited for lighter parcels and for customers in remote regions, including the Highlands, Islands, and Northern Ireland.
  • DHL – Ideal for most mainland UK orders, providing fast, tracked delivery and excellent reliability for time-sensitive shipments.

Our checkout system automatically displays the available delivery services for your postcode and order weight, ensuring you always see the most suitable options.

Note: Heavy, bulky, or freight-only orders will be charged separately.
Our website is designed for quick, transactional purchases rather than bulk or palletised orders.
Please contact us in advance for a tailored freight quotation if your order falls into this category.


⏱ Dispatch & Delivery Timing

We aim to dispatch all in-stock orders promptly, but delivery depends on both when you order and which service you select.

  • UK orders: placed by 2:00 PM Monday–Friday are usually dispatched the same day.
  • International orders: placed by 2:00 PM Monday–Thursday are usually dispatched the same day.

Orders placed after these times are processed the next working day. This means delivery may occur the following day or later, depending on the courier and service selected.

Once dispatched, your chosen delivery service determines how quickly your parcel arrives:

  • Standard services We use Royal Mail Tracked 24 or DHL Parcel as our ‘Standard’ services. They are not guaranteed to arrive next working day.
  • Premium services (e.g. Royal Mail Special Delivery or DHL by Noon) offer guaranteed delivery windows.

If your order is time-sensitive, we strongly recommend choosing a guaranteed service or contacting us before ordering to confirm availability.

Please note: For logistical reasons, we may occasionally adjust the delivery method selected at checkout. For example, smaller items may be better suited to letterbox-friendly packaging or may be at greater risk of delay or loss via certain services. We actively monitor courier and postal service disruptions—including strikes and delays—and may modify shipping arrangements to help ensure timely and secure delivery.


📅 Busy Periods & Delays

We always aim to dispatch promptly, but delivery times may be affected by:

  • Seasonal demand (e.g. Christmas, bank holidays, or industry shutdowns)
  • Courier network delays outside our control
  • Supplier lead times or calibration requirements for certain equipment

If your delivery is time-critical, please contact us before ordering so we can confirm stock and courier availability.


🌍 International Shipping

We ship worldwide using UPS Express Saver® and other trusted global courier partners. All international shipments are tracked and generally dispatched Monday to Thursday to ensure smooth customs clearance and transit.

Estimated delivery times:

  • Europe: 1–2 working days
  • North America: 2–3 working days
  • Asia-Pacific & Rest of World: 3–5 working days

Delivery times vary depending on location, customs clearance, and local courier performance.


💰 Taxes, Customs & Import Duties

International customers are responsible for any applicable taxes, customs charges, or import duties.
These are not included in our product or shipping prices.

Your courier will typically provide a secure payment link for any import charges once your parcel reaches customs.
If import fees are refused and the parcel is returned, we will issue a refund minus all incurred shipping and return costs.


📍 Using Your Own Courier

If you would prefer to arrange collection via your own courier (UK or international), please contact us before placing your order to coordinate collection from our Wisbech warehouse.


📝 Important Notes

  • Please ensure your delivery address and contact number are correct at checkout.
  • Undelivered parcels may be returned to us after a short holding period.
  • Redelivery or return fees may apply, even if your order originally qualified for free delivery.
  • By placing an order, you confirm your understanding and acceptance of this policy.