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,
and the model 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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