ST/STR/STA MANUAL
22
118107-001 REV J
Chapter 6
M
AINTENANCE
his section describes periodic servicing and
performance testing procedures.
THIS POWER SUPPLY GENERATES VOLTAGES
THAT ARE DANGEROUS AND MAY BE FATAL.
OBSERVE EXTREME CAUTION WHEN WORKING
WITH HIGH VOLTAGE.
6.1 Periodic Servicing
Approximately once a year (more often in high dust
environments), disconnect the power to the unit and
remove the top cover. Use compressed air to blow dust
out of the inside of the unit. Avoid touching or handling
the high voltage assembly. Be sure that the fan is not
obstructed and spins freely. The fan has sealed bearings
and does not need lubrication. Be sure to replace the
cover before operating for proper cooling.
Turn the chassis over and remove the bottom cover. Use
compressed air to blow dust out. NOTE: On 10kV and
below, an air insulated high voltage section is used.
Avoid touching or handling the high voltage assembly.
Be sure to replace the bottom cover before operating the
unit.
6.2 Performance Test
HIGH VOLTAGE IS DANGEROUS. ONLY
QUALIFIED PERSONNEL SHOULD PERFORM
THESE TESTS
.
High voltage test procedures are described in Bulletin
STP-783, available by clicking the following link
Standard Test Procedures for High Voltage Power
Supplies.
Test equipment, including an oscilloscope, a
high impedance voltmeter, and a high voltage divider
(such as the Spellman HVD-100) is needed for
performance tests. All test components must be rated for
applicable operating voltage.
6.3 High Voltage Dividers
High voltage dividers for precise measurements of output
voltage with accuracy up to 0.1% are available from
Spellman. The HVD-100 is used for voltages up to
100kV, the HVD-200 measures up to 200kV and the
HVD-400 measures up to 400kV. The Spellman HVD
divider is designed for use with differential voltmeters or
high impedance digital voltmeters. The data sheet for
Spellman’s series of HVD dividers can be viewed by
clicking
here
.
T
WARNING
WARNING
