- Oct 26, 2009
Very smart analysis :topic:As I have said before, A meter is only as good as the owner's understanding of it. Any meter can display information and it is up to YOU to understand the limitations of the readings. This is especially true of LPM's. With these sensors, ambient temp affects both the sensor and the laser source itself. Many other variables come into play also so the experimenter needs to "play" with the meter over time to get it's feel.
LPMs are a somewhat new device in our hobby. I myself have 5 Scientech meters spread around here. I try to keep them calibrated but they are never the same and as a hobby, none of our meters will correlate better than 5% on an AVERAGE and that's on a good day.
I just tested my Mighty Skylaser 200 mW green on four meters and I'm surprised at my reading correlation. 80, 76, 84, 80 mW ---It's usually not that good. Well not bad for my 200 mW laser....... It's usually about 50 mW :-(
What I'm saying here is to learn the limits of the test equipment and don't dispare if you read 875 mW at 1 Amp while someone else reports 925 mW at the same current.
There are too many variables.
As any scientific instrument for environmental measurement, a LPM is not usefull for absolute data but only to compare different lasers