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Principle
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Real-time double beam ratio recording spectrophotometer with pre-sample chopping. |
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Optics
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F/4.2 monochromator with four gratings and nine filters; purgeable.
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Screen Readouts
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Pentium computer with HP color or laserjet printer. Files saved as default binary and optional ASCII and EXCEL files with all operating parameters, time, date, and optional comments stored along with numeric results.
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Readout
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Quantitative results
Wavenumber annotation
Ordinate scale annotation
Scan conditions and peak printout
Arbitrary user comment string of any length
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Data Handling
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Corrected spectrum routine, wherein a spectrum is collected in open chamber run and corrected with blocked beam scan.
Screen cursor with dynamically presented values on its location
Spectral accumulation
Fast screen graphics with reformatting in up to three dimensions
Quantitative analysis for 2D and 3D data using most modern, powerful, fast, and useful algorithms existing.
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Source
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Opperman source1, self-igniting and self regulating
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Detector
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Coated caesium halide lens thermocouple, which withstands high humidity conditions (original detector) OR a new TGS detector, preamp PCB and the bracket to install it into the same place as the original thermocouple. Among the advantages of the newer detector is its production of a near square wave rather than the exponential rise and fall of the original thermocouple.
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Abscissa Range
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5000 cm-1 to 180 cm-1 (2,000 to 55,555 nm)
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Abscissa Accuracy
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± 3 cm-1 from 5000 to 4000 cm-1
± 2 cm-1 from 4000 to 2000 cm-1
± 1 cm-1 from 2000 to 180 cm-1
Accuracy is independent of scan conditions
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Abscissa Repeatability
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Run to run repeatability after warm up of 0.005 cm-1
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Abscissa Expansion
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User selectable through Olis Windows 2000 Professional software
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Scan Time
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Highly variable, based on scanned range, how many data points per scan, amount of signal averaging per retained datum, etc.
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Time Drive
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Arbitrary data collection rates up to two data points per second.
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Ordinate Scales
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Double Beam, transmission (T)
Double Beam, percent transmission (% T)
Double Beam, absorbance (AU)
Single Beam, transmission
Single Beam, absorbance
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Ordinate Accuracy and Repeatability
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better than 0.1%T , typically limited by noise level, which is a function of scan speed and signal averaging during scan
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Ordinate Scale Expansion
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User selectable through Olis software
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Baseline Flatness
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Better than ± 0.5%T
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Resolution
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Best resolution for each slit mode. Olis software implements the automatic slit mode of the original 983. The slits are programmed to adjust during a scan to maintain constant intensity at the detector.
| Mode | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
| Resolution | 10 | 7 | 5 | 3 | 2 | 1 | 0.5 cm-1 |
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Stray light
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< 0.1% 5000 to 2000 cm-1
< 0.2% 2000 to 1000 cm-1
< 0.3% 1000 to 750 cm-1
< 0.4% 750 to 400 cm-1
< 1.0% 400 to 180 cm-1
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Ambient Temperature range
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15 to 35°C
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Relative Humidity
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45 to 75%
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External Requirements
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117 volt, 60 Hz
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Power requirement
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250 VA
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Acceptable variations in power supply
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Voltage: ±10%;
Frequency: ±4%;
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Size
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1200 mm long x 500 mm deep x 250 mm high
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Weight
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< 50 kg
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