LISDAD example

Flashes per Minute (FPM) Factor

Note to the left of the Y axis...the number "2" next to the "FPM". This means that the operator must multiply the LDAR values on the graph by 2. In this example, 140 LDAR flashes (2 x 70) were occurring around the "0-minute" time. Sometimes the multiplication factor will be as high as 3 or 4 (we have seen it as high as 5!). Always be alert to the digit next to the FPM.