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1-4
Figure 1: OUTLINE DIAGRAM
Options
The following factory installed options are available with this
instrument.
Option Description
OE3 Input Power:
230 Vac +/-10%, 47-63 Hz, Single Phase
OE9 Input Power:
100 Vac +/-10%, 47-63 Hz, Single Phase
Instrument Identification
Hewlett-Packard power supplies are identified by one serial
number. The letter "KR" designates Korea as the country of
manufacture, the first digit indicates the year (1 = 91, 2 = 92,
etc), the second two digits indicate the week, and the last five
digits of the serial number are a different sequential number
assigned to each power supply.
If the serial number on your instrument does not agree with
those on the title page of this manual, a yellow change sheet
may be included if a design change has affected the contents
of this manual.
INSTALLATION
Inspection
When you receive your power supply, inspect it for any obvi-
ous damage that may have occurred during shipment. If there
is damage, notify the carrier and the nearest HP Sales Office
immediately. Warranty information is printed on the inside
front cover of this manual. Save the shipping carton and
packing materials in case the supply has to be returned to
Hewlett-Packard in the future. If you return the supply for ser-
vice, attach a tag identifying the owner and model number.
Also include e brief description of the problem.
The "Turn-On Checkout Procedure" in this manual can be
used as an incoming inspection check to verify that the sup-
ply is operational. See the appendix for tests that verify the
supply’s specifications.
Location And Cooling
Figure 1 shows the outline shape and dimensions of the unit.
It is shipped ready for bench operation after connection to an
ac power source. The supply is air cooled. Sufficient space
should be allotted so that a free flow of cooling air can reach
the rear of the instrument when it is in operation. It should be
used in an area where the ambient temperature does not
exceed 40 degrees C. The current derates 1% per degree C
between 40°C-55°C.
Input Power Requirements
Depending on the line voltage option ordered, the supply is
ready to be operated from one of the power sources listed in
the Specification Table. The input voltage range, and the
input current and power at high line voltage and full load is
listed for each option.
Power Cord
This instrument is equipped with a three conductor power
cable. The third conductor is the ground conductor and when
the cable is plugged into an appropriate receptacle, the
instrument is grounded. The offset pin on the power cable
three prong connector is the ground connection. In no event
should this instrument be operated without an adequate cabi-
net ground connection.
The power supply was shipped with a power cord for the type
of outlet used at your location. If the appropriate cord was not
included, contact your nearest HP Sales Office to obtain the
correct cord.

1-5
Figure 2: FRONT PANEL CONTROLS AND INDICATORS
OPERATION
Turn-On Checkout Procedure
The following checkout procedure describes the use of the
front panel controls and indicators illustrated in Figure 2 and
ensures that the supply is operational:
a. Push LINE button to ON.
b. Set RANGE push button to desired range.
c. Turn VOLTAGE control fully counter clockwise to ensure
that output decreases to 0 Vdc than fully clockwise to
ensure that output voltage increases to the maximum out-
put voltage.
d. While depressing CC SET push button, turn the CUR-
RENT control fully counter clockwise and than fully clock-
wise to ensure that the current limit value can be set from
zero to maximum rated value.
e. Connect load to output terminals.
Shock Hazard
Disconnect ac power before making
output terminal connections.
Constant Voltage Operation
To set up a power supply for a constant voltage operation,
proceed as follows:
a. Turn on power supply and adjust 10-turn VOLTAGE con-
trol for desired output voltage(output terminals open). CV
LED should light.
b. While depressing CC SET push button, adjust 10-turn
CURRENT control for maximum output current allow-
able(current limit). During actual operation, if a load
change causes the current limit to be exceeded, the
power supply will automatically crossover to constant cur-
rent mode and output voltage will drop proportionately.
Constant Current Operation
To set up a power supply for a constant current operation,
proceed as follows:
a. Turn CURRENT control fully counter clockwise to ensure
that output decreases to 0 A, and than turn on power sup-
ply.
b. Adjust VOLTAGE control(no load connected) for maxi-
mum output voltage allowable(voltage limit), as deter-
mined by load conditions. During actual operation, if a
load change causes the voltage limit to be exceeded, the
power supply will automatically cross- over to constant
voltage operation at the preset voltage limit and output
current will drop proportionately.
c. Adjust CURRENT control for desired output current while
depressing CC SET button(CC LED will not light until the
supply is loaded)
Connecting Loads
The output of the supply is isolated from earth ground. Either
output terminal may be grounded or the output can be floated
up to 240 volts off ground.
Each load should be connected to the power supply output
terminals using separate pairs of connecting wires. This will
minimize mutual coupling effects between loads and will
retain full advantage of the low output impedance of the
power supply. Each pair of connecting wires should be as
short as possible and twisted or shielded to reduce noise
pickup(lf a shield is used, connect one end to the power sup-
ply ground terminal and leave the other end unconnected.).
Operation Beyond Rated Output
The output controls can adjust the voltage or current to values
above(up to 5%) the rated output as indicated on the front
panel display. Although the supply can be operated in the 5%
overrange region without being damaged, it can not be guar-
anteed to meet all of its performance specifications in this
region.
WARNING

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