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SMART Spectro 2 Operator’s Manual 04.16
SPECIFICATIONS
INSTRUMENT TYPE: Single beam spectrophotometer
Wavelength Range
350-1000 nm
Optical System
Single Beam, Grating 1200 lines/mm
Wavelength Accuracy and
Repeatability
± 2 nm
Photometric Accuracy
± 0.5%T
Bandwidth
4 nm
Transmittance Range
0-125%T
Absorbance Range
-0.3-2.500A
Stray Light
0.4%T@360 nm
Display
LCD
Light Source
Halogen 12V / 10W
Power Supply
Power Adapter 12 VDC
Power Consumption
50W
Dimension (L x W x H)
360 x 280 x 180 mm
Net Weight
13.2 lbs, 6 kg
Communication Port
USB
STATISTICAL AND TECHNICAL DEFINITIONS RELATED TO PRODUCT
SPECIFICATIONS
Method Detection Limit (MDL): “The method detection limit (MDL) is defi ned as the
minimum concentration of a substance that can be measured and reported with 99%
confi dence that the analyte concentration is greater than zero and is determined from
analysis of a sample in a given matrix containing the analyte.”1 Note that, “As Dr. William
Horwitz once stated, ‘In almost all cases when dealing with a limit of detection or limit of
determination, the primary purpose of determining that limit is to stay away from it.’”2
1. CFR 40, part 136, appendix B
2. Statistics in Analytical Chemistry: Part 7 – A Review, D. Coleman and
L Vanatta, American Laboratory, Sept 2003, P. 31.
Precision:
Precision is the numerical agreement between two or more measurements.3
The precision can be reported as a range for a measurement (diff erence between the
min and max). It can also be reported as the standard deviation or the relative standard
deviation. It is a measure of how close together the measurements are, not how close they
are to the correct or true value.
The precision can be very good and the accuracy very bad.
This is a useful measure of the performance of a test method.
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