OL 410-200 Precision Lamp Source (200 W)

The OL 410 is a microprocessor-controlled, precision DC lamp source specifically designed to accurately operate tungsten filament lamp standards and calibration sources. The power output range is 200 watts for the OL 410-200.

Tungsten lamp standards must be operated at their specified calibration current in order to realize the accuracy of the standard. A small error in setting the lamp current can induce a sizeable, wavelength dependent error in the spectral output of the lamp. The OL 410 enables the lamp current to be set to an accuracy of better than ±0.02%, a factor of about 121⁄2 better than most other commercial power supplies, which are typically 0.25%.

In order to eliminate electrical shocking of the lamp due to high initial current surges, a ramp function is used to control the turn-on current rise. Once the instrument is turned on, the current automatically increases at a slow, safe rate until the set current is reached. A fail-safe, shut down circuit protects the lamp standard against any equipment malfunctions.