Calculate how many samples you need to collect in order to effectively apply the statistical test of EN689. Sample Planner incorporates the Preliminary Tests and the ExpoStats algorithm to simulate 1000s of realistic scenarios to find how many samples you need to be 80% confident of compliance.

Estimate hearing threshold shifts associated with age and noise exposure based on the ISO1999 calculations.

Use the sample size and largest result to determine compliance in this very simple, but powerful tool.

A basic version of NDexpo replicated in Excel - be careful of limitations listed in file.