B&K Precision 1693, 1694 User Manual

Model 1693, 1694

Switching DC Power Supply

INSTRUCTION MANUAL

1 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 flammable gases or fumes.
Operation of any electrical instrument in such an environment constitutes a definite
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 qualified maintenance
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.

DO NOT SERVICE OR ADJUST ALONE

Do not attempt any internal service or adjustment unless another person, capable of
rendering first aid and resuscitation, is present.

DO NOT SUBSTITUTE PARTS OR MODIFY THE INSTRUMENT

Do not install substitute parts or perform any unauthorized modifications to this
instrument. Return the instrument to B&K Precision for service and repair to ensure
that safety features are maintained.

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e line cord to the AC mains, check the rear panel

WARNINGS AND CAUTIONS

WARNING and CAUTION statements, such as the following examples, denote a

hazard and appear throughout this manual. Follow all instructions contained in
these statements.

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:

WARNING:

CAUTION:

CAUTION:

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.

To avoid electrical shock hazard, disconnect power cord before
removing covers. Refer servicing to qualified personnel.

Before connecting th
AC line voltage indicator. Applying a line voltage other than the
indicated voltage can destroy the AC line fuses. For continued fire
protection, replace fuses only with those of the specified voltage and
current ratings.

This product uses components which can be damaged by electro­static discharge (ESD). To avoid damage, be sure to follow proper
procedures for handling, storing and transporting parts and
subassemblies which contain ESD-sensitive components.

SAFETY SYMBOLS

This symbol on an instrument indicates that the user should refer to the

operating instructions located in the manual.

Certification

We certify that this product met its published specifications at time of shipment from the

factory.

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Compliance Statements

Disposal of Old Electrical & Electronic Equipment (Applicable in the European Union and

other European countries with separate collection systems)

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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Contents

1 Safety Summary ........................................................................................ 1

2 Introduction .............................................................................................. 5

3 Installation ................................................................................................ 6

3.1 Initial Inspection ................................................................................ 6

3.2 Input Power Requirements ............................................................... 6

4 Controls and Indicators ............................................................................. 7

4.1 Front Panel ........................................................................................ 7

4.2 Rear Panel ......................................................................................... 8

5 Operating Instructions .............................................................................. 9

5.1 Instrument Hook-Up ....................................................................... 10

5.2 Using Both Main and Auxiliary Outputs .......................................... 11

5.3 Remote Sensing............................................................................... 11

5.3.1 Connection .............................................................................. 11

5.3.2 Disconnection .......................................................................... 12

5.4 Remote Control ............................................................................... 12

5.4.1 Voltage Remote Control .......................................................... 12

5.4.2 Enable and Disable the Output ............................................... 15

6 Maintenance ........................................................................................... 16

6.1 When the Unit is Not Turning On ................................................... 16

6.2 Fuse Replacement ........................................................................... 16

6.3 Instrument Repair Service ............................................................... 17

7 Specifications .......................................................................................... 18

8 Certification ............................................................................................ 20

9 Service Information ................................................................................ 21

10 Limited One-Year Warranty .................................................................... 22

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2 Introduction

B&K Precision models 1693 and 1694 switching mode DC power supplies provide
high current output in a lightweight and compact package. It is suitable for a variety
of uses, especially for powering DC operated mobile radio equipment on the bench.
These 900W power supplies provide a variable voltage output from 1 V to 15 V at 60
A (model 1693) or from 1 V to 30 V at 30 A (model 1694). In addition, a remote
sensing terminal is available for use to compensate for voltage drops due to
resistances from load leads. The output voltage level can also be externally controlled
via an analog remote control terminal. Switching mode power supplies have the
advantage of being lightweight and high in efficiency when compared to traditional
linear mode power supplies. The efficiency can exceed 85% under optimal conditions.
Bright 3-digit LED displays give an accurate and highly readable indication of settings.

Features

• Up to 60 A output current

• Lightweight and compact

• Dual 3-digit LED displays

• Remote sense terminal

• Analog remote control via external voltage source or variable resistor

• Current foldback circuitry with illuminated indicator prevents overloading

the power supply

• Overtemperature protection circuitry

• Overvoltage protection

• Front panel auxiliary output

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