User's Guide

Chapter 3. Using Your APS3
3.10
displayed in the main ParticleSpectrum window are frequency or density measurements.
You need to set that display choice in the main window (see “Displaying Particle Density or
Frequency,” on page 3.17).
3. Under Threshold Settings, specify the frequency or density units from the Measurement
Units menu, the numerical value of the alarm No-Go Threshold, and the bin to apply the
threshold to by selecting an option from the Particle Sizes drop-down menu. Lengthening
the averaging interval smooths out the raw data, so the measurement must exceed the
threshold for a longer time to trigger the alarm. The averaging interval you specify for the
Go/No-Go threshold is independent of the averaging interval for graphing the particle
measurements (see “Changing the Averaging Interval,” on page 3.19).
4. Click OK. The Go/No-Go settings take effect immediately. When the next active No-Go
event occurs, ParticleSpectrum changes the green Go/No-Go indicator to red (see Figure 3.5
on page 3.8).