Although either of the 2 modes outlined below can be used, we have found that Single echo tends to perform better in the environment of Undercarriage measurement.
Multiple Echo
- Multiple Echo measurement mode is by far the most reliable and quickest method for thickness measurements.
- It works by looking for three matched echoes it can verify the thickness measurement is valid.
- Multiple echo mode will ignore surface coatings.
- However because it requires three echoes to take a measurement in heavily corroded steels there is often an insufficient number of echoes to take a measurement.
- Not normally used during inspections.
Single Echo
- Single Echo measurement mode is most useful on heavily corroded metals where Multiple Echo fails. Because it only needs the first return echo to take a measurement it performs well on virtually all steel conditions.
- Single echo mode will not ignore surface coatings.
- Single echo measurements use a twin element (twin crystal) probe, which require ‘zeroing’ at regular intervals especially if the ambient temperature is changing.
Because components on the undercarriage do not have surface coatings and are made of steel, this is the measurement mode that is used during inspections.