High-stability tungsten lamp power supply for spectrophotometers

✍ Scribed by Ronald D. Edstrom

• Publisher: Elsevier Science
• Year: 1977
• Tongue: English
• Weight: 219 KB
• Volume: 80
• Category: Article
• ISSN: 0003-2697
• DOI: 10.1016/0003-2697(77)90685-6

✦ Synopsis

A very stable, easily constructed, and inexpensive power supply is described for use with spectrophotometers or other instruments depending on a tungstenfilament incandescent bulb as a light source. The supply provides constant voltage to the lamp with protective circuitry to limit the inrush current when the lamp is turned on. A stability of the light output with this supply equivalent to less than a 0.002 apparent absorbance change was observed over a period of 2-150 min when the supply was connected to a prewarmed lamp and housing.