PMX MANUAL
39
118164-001 REV. A
CHAPTER 6
MAINTENANCE
6.1
INTRODUCTION
If a major component (such as the
multiplier module or system control
board) is replaced, recalibration will be
needed. The acceptance test procedure
per Chapter 5 should then be performed
prior to placing the generator back into
service.
WARNING:
ALWAYS SWITCH OFF MAINS POWER TO THE GENERATOR AND WAIT A
MINIMUM OF 5 MINUTES FOR CAPACITORS TO DISCHARGE BEFORE
BEGINNING ANY MAINTENANCE.
6.2
PERFORMANCE TEST
Only qualified personnel should perform
these tests.
High voltage test procedures are described
in Spellman Bulletin STP-783, Standard
Test Procedures for High Voltage Power
Supplies. Copies can be obtained from the
Spellman Customer Service Department.
Test equipment, including an oscilloscope,
a high impedance voltmeter, and a high
voltage divider such as the Spellman HVD-
100 or HVD-200, is needed for performance
tests. All test components must be rated for
operating voltage.
6.3
HIGH VOLTAGE DIVIDERS
High voltage dividers for precise
measurement 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. The Spellman
divider is designed for use with differential
voltmeters or high impedance digital
voltmeters. The high input impedance is
ideal for measuring high voltage low current
sources, which would be overloaded by
traditional lower impedance dividers.
