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DPS
Calibration
Each power supply is calibrated and checked at the
factory to ensure proper performance before shipping.
However, output values for each unit should be
checked by the user on-site before the equipment is
placed into service.
Indicators
There is a red LED indicator on the front panel of the
DPS 240, which lights when the unit is producing dc
output. The indicator, labeled “OUTPUT ON”, goes
out if a short circuit, overload, or any other unaccep-
table condition occurs during operation.
Controls
The unit’s front panel has two multiturn potentiom-
eters labeled “VOLTAGE ADJUST” and “CURRENT
LIMIT”. Voltage adjust allows the user to set dc out-
put to ±5.0% of the rated value. Using the current
limit potentiometer, the user can calibrate the unit so
that the output voltage stays within the specified
range, even when input varies ±10%. This protects
the DPS 240 from possible damage due to overheat-
ing.
Refer to table 1 for the equipment specifications of
the DPS 240.
Calibration Equipment
Table 2 lists the equipment required to calibrate the
DPS 240. This equipment must be provided by the
user.
Table 2. Calibration Equipment
Description
Variac or equivalent; capable of 105-264 Vac output
Accurate to 0.01 millivolt
Accurate to 1.0 milliamp
Powerstat, or equivalent; capable of output load of 175ý
Head measuring less than 2.54 mm (0.1 inch) in width
Equipment
Adjustable ac Power Source
Voltmeter
Milliammeter
Variable Power Resistor
Screwdriver, slotted
