68805-M
ARC LAMP POWER SUPPLY
10
SETUP AND USE
The Oriel Model 68805 Arc Lamp Power Supply was designed for ease of use with a wide variety
of arc lamp light sources. Please follow the above precautions, and the following procedures to
use the power supply safely.
Open Circuit Setup
Make all connections to the ignitor and to the housing. If an interlock cable is available, then
connect this to the interlock socket. Otherwise, use the jumper plug that was shipped with the
power supply.
The interlock operates by interrupting a 24 VAC source to an internal relay.
Therefore, this must be a jumper or contact closure and not a ground connection.
Install the arc lamp according to the directions in the housing manual.
If the lamp operating current is unknown, then determine the current setting by using Ohm’s Law:
amperes = power ÷ volts.
Check that the line voltage selector is in the proper position for operation in your area. Connect
the line cord to the IEC socket, and plug the unit into an AC outlet.
Ensure that the “OUTPUT” control knob is set to the full counter clockwise position. Turn on the
power supply. Place the meter select switch to “VOLTS” and observe that the output is
.
100
volts DC. Release the meter switch.
Press the “PREADJUST” switch. Read the meter display on the ampere scale. This is the
operating output current which will be delivered to the arc lamp. Turn the “OUTPUT” knob to set
the desired operating current. This step is necessary only when initially setting up the power
supply or whenever a new lamp with a different current rating is going to be used.
Note:
If the previous steps are not followed damage to the lamp could occur because of the
possible higher operating current setting of the “OUTPUT” control knob
.
Press the “START” switch on the power supply front panel. The output voltage should measure
off-scale on the meter, and the ignitor should fire a high voltage pulse to begin the lamp start.
Power will now be delivered to the lamp, and the meter will display this value. To view the output
voltage or current simply place the momentary contact, meter select switch to the respective
position, and monitor the appropriate scale.
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