Apogee Instruments MU-250 Manuale d'uso - Pagina 10
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Reset: To reset the meter, in either SMPL or LOG mode, push the mode button three times (RUN should be
blinking), then while pressing the down button, press the mode button once. This will erase all of the saved
measurements in memory, but only for the selected mode. That is, performing a reset when in SMPL mode will
only erase the manual measurements and performing a reset when in LOG mode will only erase the automatic
measurements.
Review/Download Data: Each of the logged measurements in either SMPL or LOG mode can be reviewed on the
LCD display by pressing the up/down buttons. To exit and return to the real-time readings, press the sample
button. Note that the integrated daily total values are not accessible through the LCD and can only be viewed by
downloading to a computer.
Downloading the stored measurements will require the AC-100 communication cable and software (sold
separately). The meter outputs data using the UART protocol and requires the AC-100 to convert from UART to
USB, so standard USB cables will not work. Set up instructions and software can be downloaded from the Apogee
website (http://www.apogeeinstruments.com/ac-100-communcation-cable/).
UV-A Measurements and Spectral Errors
Apogee Instruments model SU-200 UV-A sensors are calibrated to measure ultraviolet radiation from the sun
between 300 and 400 nm in Watts per square meter. In addition to naturally occurring UV-A radiation from the
sun, there are many electric light sources that emit UV-A radiation (e.g., cool white fluorescent, metal halide,
mercury arc, and germicidal lamps). Although the relative wavelengths of UV-A radiation differ among sunlight and
electric lights, the error estimates shown in the table below indicate the SU-200 provides reasonable estimates of
UV-A radiation coming from electric lamps (table provides spectral error estimates for UV-A radiation
measurements from radiation sources other than clear sky solar radiation). For most common lamps, the error is
less than 10 %. The SU-200 is particularly useful for determining the UV-A filtering capacity of the transparent
plastic and glass barriers that are commonly used below electric lamps.
Radiation Source (Error Calculated Relative to Sun, Clear Sky)
Direct Normal
Diffused Blue Light
Metal Halide
Quartz Halogen
Mercury Arc
T12 Fluorescent UV-A Enhanced
UV-A LED (365 nm Peak)
UV-A LED (386 nm Peak)
UV-A LED (395 nm Peak)
Clear Sky
Overcast
CWF T5
Expected EFD Error [%]
0.0
0.0
-0.2
0.3
8.2
1.2
-2.3
16.2
12.2
37.4
1.8
-36.9
Expected PFD Error [%]
0.0
-1.1
-1.0
1.4
9.2
-1.2
-3.8
16.9
15.2
35.3
-3.9
-41.2