MAGEE Scientific AE33 User Manual page 11

Aethalometer
Model AE33
actual flow – i.e., a 'dynamic' test. The point-to-point variation for the wavelength 880 nm at
the time-base set to one second is about 350 ng/m3, which translates to a couple of ng/m3 at
1 minute time resolution (Figure 4).
3000
2500
2000
1500
1000
500
268 ng/m3
0
-500
-1000
1000
Figure 4. 'Zero-air' check – the Aethalometer Model AE33 switches form sampling ambient air to filtered
air – 1 second time resolution point-to-point variation is very stable.
The response of the optical detectors of the Aethalometer Model AE33 may be verified by use
of a standard kit of Neutral Density optical filters. These are glass elements with a range of
known and stable optical absorptions, from light to dark, which are traceable from
manufacturing records back to primary standards. When these are inserted into the AE33
Aethalometer, its photodetectors will give a certain output signal.
reproducibility of the relationship between optical signal and ND Filter density from one
validation test to another; and the comparison with the original factory values; is a measure of
the consistency of performance of the instrument's optics.
User and Communications Interfaces
The Aethalometer Model AE33 incorporates the following user, data and communications
features:
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User's manual – Ver. 1.53
Point-to-point variation @ 1 second:
355 ng/m3
1500 2000
t (s)
July 2015
1 second timebase
30 point adjecent averaging
301 ng/m3
2500 3000
The stability and
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