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| Product Name | YUEFENG UV756 UV-Visible SpectroPhotometer | YUEFENG 770S UV-Visible SpectroPhotometer |
| Product Price | $1300.00 | $2591.00 |
| Details | Details | |
| Model comparison | ||
| Spectral Type | UV-Vis | UV-Vis |
| Optical Path | Single-Beam | Pseudo-Double-Beam |
| Dispersion | Grating | Grating |
| Detection | Scanning | Scanning |
| Light Source | Tungsten Deuterium | Tungsten Deuterium |
| Wavelength | 190-1100nm | 190-1100nm |
| Accuracy | ≤0.5nm | ≤0.5nm |
| Bandwidth | ≤2nm | ≤2nm |
| Detector | ||
| Stray Light | ≤0.05%T | ≤0.2%T |
| Parameter comparison | ||
| Optical inspection system | Aberration (1200L/mm Grating) | Proportional double beam of light, 1200/mm Holographic grating |
| Light spectrum Bandwidth | 2nm | 2nm |
| Wavelength Range | 190m~1100nm | 190nm~1100nm |
| Wavelength Precision | ±0.5nm | ±0.5nm |
| Wavelength Repeatability | ≤0.3nm | ≤0.2nm |
| Photometric Range | 0~200%T，-0.301~3.000A，0~9999C | 0.0%(T)~200.0%(T)；-0.301~4.000(A) |
| Photometric Precision | ±0.002A（0~0.5A）；±0.003A（0.5~1A）；±0.5%T（0~100%T） | ±0.5%(T) |
| Luminosity Repeatability | ≤0.001A（0~0.5A）；≤0.002A（0.5~1A）；≤±0.2%T（0~100%T） | ≤0.2%(T) |
| stray light | ≤0.05%T(220nm，360nm) | ≤ 0.15% (T) (at 220 nm, as NaI) (at 360 nm, as NaNO2) |
| Noise level | 100%≤0.15%T；0%≤0.01%T | 100%(T):≤0.2%(T) 0%(T):≤0.1%(T) |
| Baseline flatness | ±0.002A | ±0.002A(200nm~1090nm) |
| data output | USB port | |
| printout | Parallel entrance | RS232 printing interface |
| Illuminant | Deuterium lamp, tungsten halogen lamp | Deuterium lamp, tungsten halogen lamp |
| Concentration Range | 0~1999 | |
| drift | ≤0.001A/h@500nm | ≤ 0.0009A/0.5h (2h after startup, 250nm, 500nm) |
| scanning speed | Fast, medium, slow. | Fast, medium, slow. |
| display | High-quality 128x64-bit graphics LCD screen | |
