Global Specialties 1320 User manual

Triple Output High Resolution
Power Supply User Manual
1320
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
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Safety Summary
The following safety precautions apply to both operating and
maintenance personnel and must be observed during all phases
of operation, service, and repair of this instrument. Before
applying power, follow the installation instructions and become
familiar with the operating instructions for this instrument.
GROUND THE INSTRUMENT
To minimize shock hazard, the instrument chassis and cabinet
must be connected to an electrical ground. This instrument is
grounded through the ground conductor of the supplied, three-
conductor ac power cable. The power cable must be plugged into
an approved three-conductor electrical outlet. Do not alter the
ground connection. Without the protective ground connection, all
accessible conductive parts (including control knobs) can render
an electric shock. The power jack and mating plug of the power
cable meet IEC safety standards.
DO NOT OPERATE IN AN EXPLOSIVE ATMOSPHERE
Do not operate the instrument in the presence of ammable
gases or fumes. Operation of any electrical instrument in such an
environment constitutes a denite safety hazard.
KEEP AWAY FROM LIVE CIRCUITS
Instrument covers must not be removed by operating personnel.
Component replacement and internal adjustments must be made
by qualied service personnel. Disconnect the power cord before
removing the instrument covers and replacing components.
Under certain conditions, even with the power cable removed,
dangerous voltages may exist. To avoid injuries, always
disconnect power and discharge circuits before touching them.
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DO NOT SERVICE OR ADJUST ALONE
Do not attempt any internal service or adjustment unless another
person, capable of rendering rst aid and resuscitation, is
present.
DO NOT SUBSTITUTE PARTS OR MODIFY THE INSTRU-
MENT
Do not install substitute parts or perform any unauthorized
modications to this instrument. Return the instrument to Global
Specialties for service and repair to ensure that safety features
are maintained.
WARNINGS AND CAUTIONS
A WARNING statement calls attention to an operating procedure,
practice, or condition, which, if not followed correctly, could result
in injury or death to personnel.
A CAUTION statement calls attention to an operating procedure,
practice, or condition, which, if not followed correctly, could result
in damage to or destruction of parts or the entire product.
WARNING: Do not alter the ground connection. Without the
protective ground connection, all accessible conductive parts
(including control knobs) can render an electric shock. The
power jack and mating plug of the power cable meet IEC safety
standards.
WARNING: To avoid electrical shock hazard, disconnect
power cord before removing covers. Refer servicing to qualied
personnel.
CAUTION: Before connecting the line cord to the AC mains,
check the rear panel AC line voltage indicator. Applying a line
voltage other than the indicated voltage can destroy the AC line
fuses. For continued re protection, replace fuses only with those
of the specied voltage and current ratings.
CAUTION: This product uses components which can be
damaged by electrostatic discharge (ESD). To avoid damage,

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be sure to follow proper procedures for handling, storing and
transporting parts and subassemblies which contain ESD-
sensitive components.
COMPLIANCE STATEMENTS
This product is subject to Directive 2002/96/EC of the European
Parliament and the Council of the European Union on waste
electrical and electronic equipment (WEEE), and in jurisdictions
adopting that Directive, is marked as being put
on the market after August 13, 2005, and should
not be disposed of as unsorted municipal waste.
Please utilize your local WEEE collection facilities
in the disposition of this product and otherwise
observe all applicable requirements.
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Table of Contents Page
1 Introduction .............................................................5
1. Overview ...................................................................................5
2. Features ....................................................................................5
2 Installation...............................................................5
1. Initial Inspection ........................................................................5
2. Input Power Requirements..........................................................6
3. Ventilation .................................................................................6
3 Product Description..................................................7
1. Front Panel ................................................................................7
2. Rear Panel .................................................................................9
4 Operating Instructions.............................................9
1. Setting the Output Voltage and Output Current ............................9
2. Constant Voltage (CV) /Constant Current (CC) Mode...................10
3. System Conguration................................................................11
5 Specications .........................................................15
6 Maintenance...........................................................16
1. Preventative Steps....................................................................16
2. When the Unit is Not Turning On ...............................................16
3. Fuse Replacement ....................................................................16
7 Service and Warranty Information ........................17
1. One Year Warranty ...................................................................17
2. Calibration and Repair ..............................................................17

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1 Introduction
1. Overview
Global Specialties Model 1320 Triple Output High Resolution DC
Power Supply provides two variable outputs (0 – 30V / 0 – 3A)
and one xed output (5V / 3A). The variable outputs can work
independently, in series tracking, or parallel mode. Conveniently
adjust voltage and current with independent front panel knobs
and bright quad display. This power supply is ideally suited for
applications in electronic test, production, and service, where
multiple independent DC power supplies are required and bench
space is at a premium.
2. Features
zSeparate 4-digit displays for voltage and current on vari-
able outputs
zThree independent outputs
zIndividual control of voltage and current for variable outputs
zCV (constant voltage) / CC (constant current) mode opera-
tion
zLED indication for CV / CC mode
zOverload indication LED for fixed output
zSeries tracking and parallel mode operation
zPower On/Off switch on front panel
zInput voltage selection on rear side (120 VAC/ 240 VAC)
2 Installation
1. Initial Inspection
This unit is tested prior to shipment. It is therefore ready for
immediate use upon receipt. An initial physical inspection should
be made to ensure that no damage has been sustained during
shipment.
Inspect the packing box on receipt for any external damage.
If any external damage is evident, remove the instrument and
visually inspect its case and parts for any damage. If damage to
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the instrument is evident, a description of the damage should be
noted on the carrier’s receipt and signed by the driver or carrier
agent. Save all shipping packaging for inspection. Forward a
report of any damage to the agent through which the unit is
procured.
Retain the original packing in case subsequent repackaging for
return is required. Use of the original packing is essential.
After the mechanical inspection, verify the contents of the
shipment. The items included in this package are:
z1320 Power Supply
zPower Cord
zUser Manual
zBanana Plug to Alligator Clip Lead Wires (Black & Red)
2. Input Power Requirements
The instrument can operate on 120 V or 240 VAC source at 50
or 60 Hz. The line selector plug on the rear panel allows you to
select the line voltage. Before connecting the power plug to an
AC line outlet, be sure to check that voltage selector plug is set
in the correct position corresponding to the line voltage in your
location and the fuse rating is as shown in the table.
Selector Line Voltage Fuse
120 V 100~125 V, 50/60 Hz 6 A
240 V 220~240 V, 50/60 Hz 3 A
3. Ventilation
Before applying power to unit, make sure that input voltage
setting is correct and the ventilation holes are not blocked.
Ensure that the ventilation fan located on the rear panel is
working well (it should turn on when powered on). Do not load
the output if ventilation fan is not working otherwise it may cause
the power supply to overheat.
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3 Product Description
Figure 1. Front Panel
1. Front Panel
1. Power switch
2. Negative output terminal of the  xed 5V/3A output
(black)
3. Positive output terminal of the  xed 5V/3A output (red)
4. Overload indicator LED for the  xed 5V/3A output
5. Negative output terminal of the MASTER output
6. Ground terminal of the master output
7. Positive output terminal of the master output
8. CC mode LED for the master to indicate constant cur-
rent
9. CV mode LED for the master to indicate constant volt-
age
10. Master voltage adjustment knob

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11. Master current adjustment knob
12. Master voltage indicator display (4-digit green 0.36”
LED)
13. Master current indicator display (4-digit red 0.36” LED)
14. Series mode indicator LED
15. Parallel mode indicator LED
16. Slave voltage indicator display (4-digit green 0.36” LED)
17. Slave current indicator display (4-digits red 0.36” LED)
18. Voltage adjustment knob for adjusting slave output volt-
age when master power is in CV mode
19. Current adjustment knob for adjusting slave output cur-
rent when master power is in CC mode
20. Negative output terminal of the slave output
21. Ground terminal of the slave output
22. Positive output terminal of the slave output
23. CC mode LED for the slave to indicate constant current
24. CV mode LED for the slave to indicate constant voltage
25. Function mode switch: Select “IND,” “SER,” or “PAR”
position for “Independent,” “Serial Tracking,” or “Parallel
Mode,” respectively.
Figure 2. Front Panel Diagram
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2. Rear Panel
A. Heat sink: Heat dissipation for power transistor
B. Ventilation Fan: 8” 24 VDC fan
C. Power input socket
D. Fuse holder and input voltage selector: The selected in-
put voltage is set to the voltage shown near the mark
which points to “E.”
E. The input power voltage indicator: The mark points to
the set input line voltage
Figure 3. Rear Panel
4 Operating Instructions
1. Setting the Output Voltage and Output Current
1. As per load requirement, calculate the voltage and max-
imum current limit to be set on output. Note: V=IR
2. Disconnect the load from output terminals.
3. For current limit adjustment, turn the current adjustment
knob counter-clockwise to get minimum current output.
4. Short the circuit between the positive and negative out-
put terminals by the accessory leads.
5. Vary the current adjustment knob clockwise until the
current displays the required current limit. The CC LED