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INSTRUCTION
MANUAL

Instruction
Manual for

XT SERIES Power Supply

This manual covers models:

7-6 60-1
15-4 120-0.5
20-3 250-0.25
30-2

TM-6000-SN
SORENSEN WARRANTY
This unit is guaranteed for five (5) years from the date of delivery against defects in material and workmanship.
This does not apply to products damaged through accident, abuse, misuse, or unauthorized repair. The
manufacturer shall not be liable for any special or consequential damage of any nature. The manufacturer will
repair or replace the non-conforming product or issue credit, at its option, provided the manufacturer's
inspection establishes the existence of a defect. Packing, freight, insurance and other charges incurred in
returning the defective products to the manufacturer will be paid by the purchaser. The manufacturer will pay
return freight if the repaired unit is deemed to be under warranty. If any questions arise concerning the
warranty, check with the manufacturer prior to taking any action.

When requesting information, assistance, or authorization, please state the model number and serial number of
the unit, available from the label on the unit.

SAFETY WARNINGS AND CAUTIONS

Please review the following points for both personal and equipment safety while operating your power supply.

HIGH ENERGY/HIGH VOLTAGE WARNINGS
Exercise caution when using and servicing power supplies. High energy
levels can be stored at the output voltage terminals on all power supplies in
normal operation. In addition, potentially lethal voltages exist in the power
circuit and the output connector of power supplies which are rated at 40V
and over. Filter capacitors store potentially dangerous energy for some time
after power is removed. Use extreme caution when biasing the output
relative to the chassis due to potential high voltage levels at the output
terminals.

AC SOURCE GROUNDING WARNING
Ensure the power supply is connected to a grounded AC outlet with the
recommended AC input connector configured for the available line voltage
as set out in the manual. There is a shock hazard if the power supply chassis
and cover are not connected to an electrical ground via the safety ground in
the AC input connector.

OPERATING AND SERVICE PRECAUTIONS
Operate the power supply in an environment free of flammable gases or
fumes. Do not use substitute parts or make any unauthorized modifications
to the power supply to ensure that its safety features are not degraded.
Contact the service technician for service and repair help. Repairs must be
made by experienced service technicians only.

CONFIDENTIALITY CLAUSE

The information contained in this document is confidential and is the exclusive property of the manufacturer. It
may not be disclosed to any person without the express written consent of the manufacturer.
INSTRUCTION MANUAL ABOUT THIS MANUAL

About This Manual
This manual contains user information for the XT Series DC power supply. It provides information about
features and specifications, installation procedures, and basic functions testing, as well as operating procedures
for using both standard and multiple supply functions. It also includes a complete set of schematics, circuit
descriptions, and parts lists for the assemblies used in the supply.

The manual is designed for users who are familiar with basic electrical laws especially as they apply to the
operation of power supplies. This implies a recognition of Constant Voltage and Constant Current operating
modes and the control of input and output power, as well as the observance of safe techniques while making
supply connections and configuration changes. The detailed schematics and circuit descriptions make it easier
to troubleshoot and configure new applications.

Section 1. Features and Specifications Describes the power supply, lists its features, and provides
tables of specifications.
Section 2. Installation Reviews safety and inspection procedures, then goes
through the basic setup. Also includes directions for the
testing of basic functions.
Section 3. Load Connection and Provides procedures for connecting the load, grounding,
Operation remote sensing, and for standard operation (Constant
Voltage and Constant Current). Series, parallel, and split
supply operation is also covered.
Section 4. Theory of Operation Provides an explanation of the functions within each of the
power supply's assemblies.
Section 5. Maintenance Covers troubleshooting, servicing, and calibration. Lists
replacement parts.
Appendix A Contains the schematic for the supply's component
assemblies.

Manual Revisions

The current release of this manual is listed below. Insert pages will update already printed manuals. Reprinted
manuals may note any minor corrections and additions on the Manual Changes list (page ii). A new release of
the manual is identified by a new release number and printing date and will include all of the additional or
corrected information since the last release.

Release 4.2 (2001/06) - contact information change only. Technical information is current to (97/10/31).

Warnings, Cautions, and Notes

Warnings, cautions, and notes are defined and shown like this:

WARNING
Describes a potential hazard which could result in injury or death, or, a
procedure which, if not performed correctly, could result in injury or death.

CAUTION
Describes a procedure which, if not performed correctly, could result in
damage to data, equipment, or systems.

Note: Describes additional operating information which may affect the performance of the equipment.

Release 4.2 (2001/06) i
MANUAL CHANGES INSTRUCTION MANUAL

Manual Changes
Nothing at this time.

ii Release 4.2 (2001/06)
INSTRUCTION MANUAL CONTENTS

CONTENTS
About This Manual...................................................................................................................................... i
Manual Changes .......................................................................................................................................... ii
Contents....................................................................................................................................................... iii
List of Figures ............................................................................................................................................. v
List of Tables............................................................................................................................................... v

1. FEATURES AND SPECIFICATIONS
1.1 Description..................................................................................................................................... 1-1
1.2 Features.......................................................................................................................................... 1-1
1.3 Options and Accessories................................................................................................................ 1-2
1.4 Specifications................................................................................................................................. 1-2
1.4.1 Electrical Specifications ...................................................................................................... 1-2
1.4.2 Mechanical Specifications................................................................................................... 1-4

2. INSTALLATION
2.1 Introduction ................................................................................................................................... 2-1
2.2 Initial Inspection ............................................................................................................................ 2-2
2.3 Indicators, Controls, and Outputs .................................................................................................. 2-2
2.4 Ventilation Requirement................................................................................................................ 2-2
2.5 Power On Procedure...................................................................................................................... 2-2
2.6 Output Biasing............................................................................................................................... 2-3
2.7 Initial Function Tests ..................................................................................................................... 2-3
2.7.1 Voltage Mode ...................................................................................................................... 2-3
2.7.2 Current Mode ...................................................................................................................... 2-3

3. LOAD CONNECTION AND OPERATION
3.1 Introduction ................................................................................................................................... 3-1
3.2 Load Connection............................................................................................................................ 3-1
3.3 Grounding...................................................................................................................................... 3-1
3.4 Remote Sensing ............................................................................................................................. 3-2
3.5 Standard Operation ........................................................................................................................ 3-3
3.5.1 Constant Voltage Mode Operation ...................................................................................... 3-4
3.5.2 Constant Current Mode Operation ...................................................................................... 3-4
3.5.3 Automatic Mode Crossover................................................................................................. 3-4
3.6 Series, Parallel, and Split Supply Operation.................................................................................. 3-5
3.6.1 Series Operation .................................................................................................................. 3-5
3.6.2 Parallel Operation................................................................................................................ 3-5
3.6.3 Split Supply Operation ........................................................................................................ 3-5

4. THEORY OF OPERATION
4.1 Introduction ................................................................................................................................... 4-1
4.2 Power Circuit (A2 Assembly) ....................................................................................................... 4-1
4.3 Meter Circuit (A1 Assembly) ........................................................................................................ 4-4

Release 4.2 (2001/06) iii
CONTENTS INSTRUCTION MANUAL

5. MAINTENANCE
5.1 Introduction....................................................................................................................................5-1
5.2 Units Under Warranty....................................................................................................................5-1
5.3 Periodic Servicing..........................................................................................................................5-1
5.4 Test Equipment ..............................................................................................................................5-1
5.5 Troubleshooting.............................................................................................................................5-2
5.5.1 Blown Fuses ........................................................................................................................5-2
5.6 Calibration .....................................................................................................................................5-2
5.6.1 Front Panel Assembly (A1) Calibration ..............................................................................5-2
5.6.2 Power Assembly (A2) Calibration.......................................................................................5-3
5.7 Replacement Parts..........................................................................................................................5-3
5.7.1 Parts Replacement and Modifications .................................................................................5-3
5.7.2 Ordering Parts......................................................................................................................5-3
5.7.3 Front Panel Assembly (A1) Replacement Parts...................................................................5-4
5.7.4 Power Assembly (A2) Replacement Parts...........................................................................5-7
5.7.5 Chassis Assembly Replacement Parts .................................................................................5-12

APPENDIX A: ASSEMBLY SCHEMATIC
A1 and A2 Assembly....................................................................................................................XS-60A1-A2

iv Release 4.2 (2001/06)
INSTRUCTION MANUAL ILLUSTRATIONS AND TABLES

LIST OF ILLUSTRATIONS
Figure 2.1-1 XT Series Supply Front Panel ................................................................................................ 2-1
Figure 2.1-2 XT Series Supply Rear Panel ................................................................................................. 2-1
Figure 3.5-1 Operating Modes .................................................................................................................... 3-3

LIST OF TABLES
Table 1.1-1 XT Series Models .................................................................................................................... 1-1
Table 1.4-1 Electrical Specifications........................................................................................................... 1-2
Table 1.4-2 Additional Characteristics........................................................................................................ 1-3
Table 5.6-1 Calibration (A1) ....................................................................................................................... 5-2
Table 5.6-2 Calibration (A2) ....................................................................................................................... 5-3
Table 5.7-1 A1 Front Panel Assembly Common Parts................................................................................ 5-4
Table 5.7-2 A1 Front Panel Assembly Differential Parts............................................................................ 5-5
Table 5.7-3 A2 Power Assembly Common Parts........................................................................................ 5-7
Table 5.7-4 A2 Power Assembly Differential Parts .................................................................................... 5-8
Table 5.7-5 Chassis Assembly .................................................................................................................... 5-12

Release 4.2 (2001/06) v
INSTRUCTION MANUAL FEATURES AND SPECIFICATIONS

1. FEATURES AND SPECIFICATIONS
1.1 Description
The XT Series of linear, regulated DC power supplies provides reliable, high performance solutions for a wide
variety of laboratory, development, and system applications. The series consists of six basic models that may be
purchased as single units or combined as dual, triple, or quadruple configurations containing any combination
of models. (See the chart below for a list of available models.)

Low output noise and ripple, excellent line and load regulation, and a wide variety of options, including analog,
RS232 standard, or IEEE-488 controlled programming, make the XT Series the first choice in flexible DC
power system design.

Table 1.1-1 XT Series Models
Model Output Voltage Output Current
XT 7-6 0-7V 0-6A
XT 15-4 0-15V 0-4A
XT 20-3 0-20V 0-3A
XT 30-2 0-30V 0-2A
XT 60-1 0-60V 0-1A
XT 120-0.5 0-120V 0-0.5A
XT 250-0.25 0-250V 0-0.25A

1.2 Features