68805-M
ARC LAMP POWER SUPPLY
2
II. INTRODUCTION
The Oriel model 68805 arc lamp power supply was designed to meet the needs of the researcher who
demands a highly regulated source of current for proper operation of arc lamp light sources. Constant
current operation of these sources of radiation is required whenever a radiometric measurement is
being made or whenever a highly stable light output is needed.
Arc lamp sources will be operated in constant current mode by the Oriel Model 68805 power supply
with the output voltage being dependent on the arc lamp’s impedance. The Oriel Model 68805 power
supply will provide a constant current of up to 11 amperes with a load voltage range of 0 to 100 volts.
A power limit, which limits the product of output voltage and current to 300 watts, protects the unit
from output overloads. A constant current power supply regulates current even into a short circuit,
andthemodel 68805 is safely limited to
12 amperes or 300 watts
. Also, the inrush current to the lamp
is limited to a maximum of 12 amperes, and the reduced discharge current minimizes electrode
erosion when starting the arc lamp. The Oriel model 68805 Arc Lamp Power Supply includes all of
the circuitry to power the lamps, to operate the required external ignitor or ignitor built into Oriel arc
lamp housing, and to meter the output parameters.
The following Oriel arc lamps may be operated with the model 68805 Arc Lamp Supply:
MODEL DC DC
NO. DESCRIPTION VOLTAGE (V) CURRENT (A)
6251 75 Watt Xe 14 5.4
6263 75 Watt Xe (Ozone free) 14 5.4
6254 150 Watt Xe UV (Ozone free) 20 7.5
6255 150 Watt Xe (Ozone free) 20 7.5
6356 150 Watt Xe 20 7.5
6282 50 Watt Hg 22 2.3
6281 100 Watt Hg 20 5
6283 200 Watt Hg 47-65 3.1-4.2
6291 200 Watt HgXe 20-25 8-9.5
6292 200 Watt HgXe (Ozone free) 20-25 8-9.5
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