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SECTION 2: CONTROLS AND INDICATORS
Control Unit (Refer to Figure 2-1)
1.
AC Power Input. Connect to a suitable grounded receptacle. See specifications tag on unit for voltage
and current requirements.
2.
Voltmeter. Displays output voltage of test set.
3.
Currentmeter. Displays current out of high voltage lead or into RTN terminal depending upon mode of
measurement.
4.
Currentmeter Range Selector. Rotate to desired range.
5.
J5. Interconnect cable between controls and HV unit connects here.
6.
ANALOG CURRENT INDICATOR. Meter displays current from 0-100% of range to give visual
indications of capacitive charging conditions or to show changing current conditions that are not easily
determined from digital meters.
7.
Output Voltage Control. Turn clockwise to increase output of test set. This control must be in the full
counterclockwise position (zero start) in order to turn High Voltage On. Under normal circumstances,
Voltage Control should always be returned to zero and voltage displayed on the voltmeter allowed to
decay to zero before pressing High Voltage Off.
8.
High Voltage Off/Ready. Press to turn off high voltage output. Under normal circumstances the voltage
control should be returned to zero, and the high voltage allowed to decay near zero before switching
High Voltage OFF. CAUTION: Capacitive loads may retain voltage for a short time after high
voltage is turned off while the internal circuitry bleeds their charge to ground.
High Voltage Off/Ready lamp must be illuminated before High Voltage ON can be activated.
Conditions required for illumination are:
•
External Interlock loop must be closed.
•
Overcurrent Trip/Reset circuit must not be tripped. (Push Reset if circuit is tripped)
9.
High Voltage On. Press to turn on high voltage.
Conditions required before high voltage will activate are:
•
Voltage control at Zero Start
•
External Interlock loop closed.
10.
Current Trip Adjust. Dial adjusts from 1 to 11 corresponding to approximately 10% to 110% of selected
output current range. Current Trip/Reset lamp illuminates and high voltage turns off when output
current exceeds setting, causing circuit to trip. Circuit also acts as short circuit and overload protection
on high voltage output. To reactivate high voltage, Voltage Control must be returned to zero, and
Reset switch must be pressed to clear Current Trip circuit.
DCD 4120-10
2-1
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