What is a WDR test and why does it matter to you as a product development engineer?

Table of Contents

1. Key Standards for WDR Testing: MIL-STD-810H, Telcordia GR-487 and Custom Requirements
2. Benefits and Importance of Wind Driven Rain Testing for Product Durability
3. Frequently Asked Questions about WDR Testing
4. Summary

What is WDR Testing?

Wind Driven Rain (WDR) testing is a critical environmental simulation method used to verify a product’s resistance against storm-like conditions. The test replicates heavy rain driven by strong winds to ensure that devices or components can withstand harsh weather scenarios without leakage or malfunction.

In product development, WDR testing helps identify design, assembly, or manufacturing flaws that could lead to water ingress, corrosion, mechanical failure, or electrical short circuits. This is especially important for outdoor electronics like mobile network base stations, industrial control cabinets, and lighting systems—equipment exposed to the elements year-round.

WDR testing confirms compliance with global standards and guarantees long-term product reliability in the field.

Toptester’s WDR Test Facility

Test pipe length: 9 meters
Pipe diameter: 1.6 meters
Motor power: 90 kW
Max wind speed: 40 m/s
Water volume: adjustable

1. Key Standards for WDR Testing

Most WDR test procedures are based on established international standards. The most commonly used standards include MIL-STD-810H and Telcordia GR-487-CORE.

MIL-STD-810H

A military-grade standard widely used for defense and communication equipment.

• Method 506.6, Procedure I: Simulates rain and blowing rain
• Wind speed: 18 m/s
• Rainfall rate: 100 mm/hour
• Droplet size: 0.5 mm
• Spray duration: 30 minutes

Telcordia GR-487-CORE

Standard for enclosures used in telecom base stations.

• Wind speed: 31 m/s
• Rainfall rate: 150 mm/hour
• Droplet size: 0.5 mm
• Spray duration: 30 minutes

Custom Testing

We can simulate any wind speed, rainfall intensity, or duration according to your product’s specific requirements.

2. Benefits of Wind Driven Rain Testing

• Mechanical integrity: Ensure enclosures withstand wind pressure without structural damage.
• Waterproof performance: Confirm that seals and joints prevent water intrusion.
• Improved product reliability: Early detection of faults saves on costly field failures and warranty claims.
• Market advantage: A certified and tested product gains trust and credibility in competitive markets.

More info: Wind and rain test

3. FAQ: Wind Driven Rain Testing

Q1: How long does a WDR test take?
A: One spray cycle lasts 30 minutes in four directions. Including setup and teardown, a full-day session is typical. Testing can usually start within 1–2 weeks of product delivery.

Q2: Can WDR tests detect issues beyond water leaks?
A: Yes. Tests can reveal mechanical stress failures, loose parts, and electrical shorts.

Q3: How is the product mounted?
A: We use a robust rotating table or floor-mount straps depending on size and design.

Q4: How is the product inspected post-test?
A: We open the unit per your instructions to check for water ingress and mechanical condition. Functional checks are also possible. You’re welcome to observe tests onsite.

Q5: What is the typical cost?
A: Starting from €3650 per test day.

Q6: When should WDR testing be done in the product development cycle?
A: Ideally at the prototype stage, when design improvements are still feasible and cost-effective.

4. Summary

Toptester is the only EU-based provider offering Wind Driven Rain testing for large-scale equipment.

Proper WDR testing cuts long-term costs and strengthens product competitiveness. As your Finnish testing partner, we offer flexible scheduling that supports your development goals.

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