Features

OPS Power Supply Demonstration Video

This video presents an overview of the OPS-A Series Power Supply's features and capabilities. 

User Interface with Large LCD Display

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

Integrated Shutter Control and Timer Features

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 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. 

Constant Current, Power, and Intensity Control Modes

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 an arc 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 electrodes degrade, changing the electrical characteristics of the lamp. The distance between the cathode and anode of the arc lamp increases, raising the lamp’s operating voltage.

  • In Power Mode, the lamp is operated at a constant power setting. As the voltage cannot be changed, the current is raised or lowered to maintain the power at the same level. As the lamp ages, the radiant output decreases. However, the lamp life is prolonged. 
  • In Current Mode, the lamp is operated at a constant current setting. As the voltage cannot be changed, the power is raised or lowered to maintain the current at the same level. As the lamp ages, the power is increased. This results in greater optical output which to some extent may help compensate for a darkening lamp envelope. However, the lamp life is reduced due to the increase in power.
  • Intensity Mode requires the use of the LIK-LMP light intensity controller kit, also made by Oriel Instruments. When operating in the lamp in Intensity Mode, the user can adjust the Flux Set parameter until the desired output intensity of the lamp is attained. When the desired Flux Set has been established, the user can adjust the Flux Calibration Factor (Flux Cal) setting to change the Lamp Intensity. A calibrated photodetector is often used to establish a Flux Set, but the LIK-LMP can be substituted and the Flux Cal adjusted to output the response of the calibrated detector during operation. This saves the user both the cost and inconvenience of returning a photodetector to a metrology lab for re-calibration, that would otherwise be required had the calibrated sensor been used during lamp operation.

Configuration Settings

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. 

Safety Interlock Prevents Accidental Exposure

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.

Operates Lamps with High Light Stability

When selecting components to assemble a complete illumination system, the OPS-A Series Power Supply is a vital component for operating a DC arc lamp with minimum light ripple. The OPS-A500 operates Oriel DC Arc Lamps with <1% rms light ripple. Oriel Instruments offers all the necessary components required to assemble such a highly stable DC arc lamp system.

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