The OPS-Q250 power supply is a high stability current and voltage source for operating 45-250 W quartz tungsten halogen (QTH) lamps. A large LCD screen and easy to use push button and knob conveniently located on the front panel allow the user to navigate through the power supply’s functions. These functions include choice of Power, Current, and Intensity control modes and setting the limits and observing in real time the important parameters of each operating mode. Up to four setups consisting of these preset parameters can be saved for easy recall in the future. For users that prefer computer control, RS-232 and USB connectors are located on the rear panel to control all of the power supply’s capabilities on a Windows based PC.
The OPS-Q250 also monitors how long the current lamp in use has been operated, allowing the user to determine when the lamp may be approaching the end of its usable lifetime. The OPS model power supplies are also CE and RoHS compliant.
A power switch and all manually controllable features of the OPS model power supplies are accessible from the front panel. Four horizontal push buttons each activate a horizontal menu that allows for configuring of lamp operation mode, shutter, display mode, and setup with the help of a corresponding vertical menu that is activated as well. These functions are conveniently displayed and easily navigated by the LCD display on the front panel of the power supply.
The OPS Series power supplies allow the lamp to be operated in power, current, and intensity control modes. There is very little difference in the short term output stability when operating a QTH lamp in constant current or constant power mode. However, the differences appear as the lamp ages. Even with a stable power supply, deposits on the inside of the lamp envelope are visible as the lamp filament degrades, changing the electrical characteristics of the lamp. More details can be found in the manual.
The OPS model power supplies are capable of storing up to four Setups. These Setups consist of lamp operation mode with relevant parameter limits (power, current, flux, etc.) and timing preferences for shutter and dosage control. This allows a user to easily recall previous testing parameters to create a repeatable setup. With 1 s resolution, the OPS Model Power Supply is also capable of logging the hours of operation has been in use to allow the user to be aware of when the lamp’s end of lifetime should be.
Newport’s Oriel Power Supplies have a safety interlock feature which must be satisfied before the power supply will power the lamp and which, if broken during operation, will disable the power supply. Overheating of the housing or accidental opening of the door will automatically shut down the power supply.
The shutter control feature of the OPS model power supply is useable in power, current, and intensity control modes. Any shutter which responds by opening or closing when receiving a TTL signal can be controlled by the OPS Power Supplies. This includes the low-cost TTL shutter characteristic of Oriel model 71445 and the shutters designed into the Oriel Solar Simulators. A BNC connector is located on the rear panel of the power supply to output these TTL signals to the electronic shutter. The shutter can be manually opened or closed by pressing the SHUTTER button on the front panel of the power supply. RS-232 or USB control of the shutter is possible as well. Utilizing the OPS Power Supply's shutter control feature enables Timed exposure control mode. The exposure or open time of the shutter and number of repeat cycles is set by the user. Exposure times can be paused and resumed at will or reset to 0 in the middle of an exposure with the easy to use push buttons on the front panel.
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