Are you sure about that Scott? I thought the averaging continued ongoing regardless of the time, but only the most recent 90 hours were stored for reporting. (And they do store and report up to 90 hours, that is a fact.)
The AVG button only gives you the last 12 hr average.
Here’s an interesting fact, and why I don’t publish my hourly values any longer…
Each hourly value is itself an average of 3 samples taken that hour. The value stored has multiple decimal places, but the value reported is rounded to one decimal place. When the final average, and EPA averages are calculated, the math is performed on the actual values (with all the extra decimals), and the result is then displayed rounded to one decimal. If you take the 40 hours reported and average them, you will almost never have the exact number reported by the machine. In other words, you are averaging “rounded” values, and the machine averages actual values.
Try explaining that to an irate seller when his average comes up to 3.8 when yours was 4.0. And he knows better because he’s an engineer. :roll:
Trust me when I say, if you are using a 1027, don’t put the hourly values in your report. Just give them the EPA average.