B+K precision 1739 User manual

Model 1739

DC Power Supply with 0.1mA Settable

Resolution

INSTRUCTION MANUAL

99 Washington Street

Melrose, MA 02176

Phone 781-665-1400

Toll Free 1-800-517-8431

Visit us at www.TestEquipmentDepot.com

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.

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:

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 qualified 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 fire protection, replace fuses only with those of the

specified voltage and current ratings.

CAUTION:

This product uses components which can be damaged by electro-

static 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

Connect to safety earth ground using the wire recommended in the user

manual.

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.

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.

Contents

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

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

3Quick Reference............................................................. 7

3.1 Front Panel......................................................................................... 7

3.2 Rear Panel.......................................................................................... 8

4Operating Instructions.................................................. 9

4.1 Instrument Hook-Up........................................................................ 10

4.2 Typical Constant Voltage Operation................................................ 12

4.3 Setting Current Limit....................................................................... 13

4.4 Typical Constant Current Operation................................................ 14

4.5 Constant Voltage/Constant Current Characteristic .......................... 15

4.6 Saving the Power Supply’s Current State........................................ 16

4.7 Connecting Two Power Supplies in Series...................................... 16

4.8 Connecting Two Power Supplies in Parallel.................................... 17

5RS232 Interface............................................................ 18

5.1 RS232 Configuration Overview...................................................... 19

5.2 RS232 Commands........................................................................... 19

6Maintenance ................................................................. 21

6.1 Fuse Replacement............................................................................ 21

6.2 Adjustments..................................................................................... 21

6.3 Calibration....................................................................................... 22

6.4 Instrument Repair Service ............................................................... 27

7Error Messages............................................................. 27

7.1 Self-Test Errors................................................................................ 27

7.2 Calibration Errors............................................................................ 27

7.3 Command Errors.............................................................................. 29

8Specifications................................................................ 29

9Service Information..................................................... 31

10 Limited Three-Year Warranty................................... 32

2 Introduction

Description

The B&K Precision model 1739 is a high quality, low current DC power source.

This power supply provides 0-30 volts dc output, adjustable with both coarse and

fine voltage controls for precise settability. The current output is 0-1 amps,

adjustable with both coarse and fine current controls. Two large LED meters

continuously monitor the output voltage and current. The VOLTAGE meter is

green, while the CURRENT meter is red.

The power supply can be programmed locally from the front panel or remotely

through the RS-232 interface. Two large LED meters continuously monitor the

output voltage and current. The voltage meter is green, while the current meter

is red. The power supply can be operated locally from the front panel or

remotely through the RS-232 interface.

The 1739 exhibits excellent regulation and low ripple characteristics. The circuit

design incorporates a pre-regulator, which greatly reduces internal power

dissipation at low output voltages. The styling is both attractive and functional.

The mechanical configuration conserves bench space and allows for easy

portability.

This instrument may be used in constant voltage or constant current

applications. The crossover from constant voltage to constant current modes is

smooth and automatic. LEDs indicate the “CV” (constant voltage) or “CC”

(constant current) mode of operation. In constant voltage applications, a current

limit may be preset. When load variations cause the current to reach the preset

limit, the unit then regulates output current rather than output voltage.

Current limits are adjustable from 1.0 mA to maximum, in as little as 0.1 mA

steps. In constant current applications, the maximum voltage may be preset.

When load variations cause current to drop below the regulated value, the unit

reverts to regulated voltage operation at the preset value.

Reverse polarity protection prevents accidental damage to the power supply

from improper connection to an external device, and current limiting protects

the equipment being powered, as well as the power supply.

The output is isolated from chassis and earth ground, which permits full flexibility

of connections. When needed, the (+) or (-) polarity may be strapped to ground,

or either polarity may be floated to an external voltage. Two supplies may be

connected in series as a 0-to-60 V power source, or two supplies may be

connected in parallel for up to twice the output current.

This power supply is well suited for a wide variety of electrical and electronics

applications in service shops, engineering labs, production testing, school

laboratories, and home use by hobbyists, where precise levels of low current are

required, including 4-20 mA loop testing and calibration or simple IC testing.

Features

•Low 1 mA settable current limit with 0.1 mA resolution

•Output on/off button

•Low ripple and noise

•Excellent regulation

•Constant voltage (CV) and constant current (CC) operation

•Two large, easy-to-read LED displays provide good visibility in bright or low

light

•LED indication for CV and CC modes

•Saved programmed values upon power-up

•RS-232 interface

•Pre-regulator for limiting internal dissipation for higher reliability

•Isolated output

•Overload protection

•Reverse polarity protection

•Power-on self test

•Modern functional configuration conserves bench space and aids

portability

3 Quick Reference

3.1 Front Panel

Figure 1 - Front Panel

INDICATORS

Either the CV or CC LED indicators will be lit whenever the unit is operating. The unit

automatically changes from CV to CC operation when the preset current limit is

reached.

1) CV (Constant Voltage) Indicator. The green LED is lit in constant voltage mode.

Unit regulates output voltage at the value set by voltage controls.

2) CC (Constant Current) Indicator. The red LED is lit in constant current mode. Unit

regulates output current at the value set by current controls.

3) Green LED Display. 4-digit display continuously monitors voltage.

4) Red LED Display. 4-digit display continuously monitors current.

VOLTAGE CONTROLS

5) Voltage Coarse Control. Coarse adjustment of output voltage. Read value on the

green LED display.

6) Voltage Fine Control. Fine adjustment of output voltage. Read value on the

green LED display.

CURRENT CONTROL

7) Current Coarse Control. Adjusts current limit in constant voltage mode. Adjusts

constant current value in constant current mode. Current can be read from the

red LED display.

8) Current Fine Control. Adjusts current limit in constant voltage mode. Adjusts

constant current value in constant current mode. Current can be read from the

red LED display.

POWER CONTROLS

9) Power ON-OFF Switch.

OUTPUT TERMINALS & CONTROL

10) “-” Terminal (Black). Negative polarity output terminal.

11) GND Terminal. Earth and chassis ground.

12) “+” Terminal (Red). Positive polarity output terminal.

13) Output On/Off button. Turns output power on or off without powering down the

entire instrument.

3.2 Rear Panel

Figure 2 - Rear Panel

13) Power Cord

14) Fuse

15) RS-232 Interface Connector

4 Operating Instructions

Safety Precautions

Use only a polarized 3-wire AC outlet. This assures that the power supply chassis,

case, and ground terminal are connected to a good earth ground and reduces

danger from electrical shock.

There is little danger of electrical shock from the power supply output, which

produces a maximum of 30 volts dc. However, there may be great danger of

electrical shock if the power supply output is connected to an external high

voltage. Some equipment being powered may contain high voltage and present a

shock hazard. Observe caution. If the power supply output is floated (referenced

to a voltage rather than earth ground) turn off the power supply and the

equipment under test when making connections. Never float the power supply to

a potential greater than 100 volts peak with respect to earth ground.

Equipment Precautions

Avoid using the power supply in ambient temperatures above +40° C. Always

allow sufficient air space around the heat sink at the rear of the power supply for

effective radiation to prevent internal heat build-up.

Although the power supply is protected against reverse polarity damage, the

circuit being powered may not include such protection. Always carefully observe

polarity; incorrect polarity may damage the equipment under test.

Do not exceed the voltage rating of the circuit being powered. Many transistors

and integrated circuits will not withstand voltage of 30 volts.

There is no need to worry about voltage spikes or overshoot damaging the

equipment under test. The voltage between the output terminals of the power

supply never exceeds the preset value as the POWER switch is turned on or off.

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