9
Example of Model Output
10
Characteristics
Level
The meter or sensor must be exactly horizontal for the most
accurate measurement. The most prominent error is caused by
small changes in the position of the sensor.
Cosine Response
The convex disc is designed to capture radiation at low angles
and minimize cosine errors. The cosine error for integrated
daily total measurements is less than 2%.
Temperature Response
Temperature response is less than 0.1% per degree Celsius.
Error Codes
The most common error code is Error 4. The meter will display
this error code on the screen if the battery voltage is too low.
To replace the battery, unscrew the back area on the meter.
Then use a pair of tweezers to gently remove the battery and
replace it with a new one. Screw the back cover back on the
meter, but be careful not to over-tighten as it can affect the
LCD screen.
11
Memory
• 99 manually stored data
points
• Automatically store 99
consecutive 30 minute
averages
• 99 daily averages
Range
• 0 - 199.9 µmol m
-2
s
-1
(full UV in sunlight; 170
µmol m
-2
s
-1
)
Absolute Accuracy
• ± 10%
Input Power
• CR2320 3 V coin cell
battery
Operating Environment
• 0 to 50 C
• Less than 90%
non-condensing, relative
humidity up to 30 C
• Less than 70% relative
humidity from 30 to 50 C
Specifications
Display
• 4.2 by 2.8 cm
Long-Term Drift
• Less than 3% per year
Cable (MU-200 Series)
• 2 meters of twisted-pair
wire
• Foil shielded
• Santoprene jacket
• Longer cable lengths are
available in multiples of 5
meters
Dimensions
• 12.6 by 7 by 2.4 cm
Mass
• MU-100: 150 g
• MU-200: 180 g
Warranty
• 1 year against defects in
materials and workmanship
www.apogeeinstruments.com
techsupport@apogeeinstruments.com
435.792.4700
Fax: 435.787.8268
