B+K precision 1744A Manual de usuario

0-35 V, 0-10 A

DC POWER SUPPLY

With Dual

Displays

INSTRUCTION

MANUAL

Model 1744A & 1745A

TEST INSTRUMENT SAFETY

WARNING

Normal use of test equipment exposes you to a certain amount of danger from electrical shock because testing must sometimes be

performed where exposed high voltage is present. An electrical shock causing 10 milliamps of current to pass through the heart will stop

most human heartbeats. Voltage as low as 35 volts dc or ac rms should be considered dangerous and hazardous since it can produce a

lethal current under certain conditions. Higher voltages are even more dangerous. Your normal work habits should include all accepted

practices to prevent contact with exposed high voltage, and to steer current away from your heart in case of accidental contact with a

high voltage. Observe the following safety precautions:

1. There is little danger of electrical shock from the dc output of this power supply. However, there are several other possible test

conditions using this power supply that can create a high voltage shock hazard:

a. If the equipment under test is the “hot chassis” type, a serious shock hazard exists unless the equipment is unplugged (just turning

off the equipment does not remove the hazard), or an isolation transformer is used.

b. If the equipment under test is “powered up” (and that equipment uses high voltage in any of its circuits), the power supply outputs

may be floated to the potential at the point of connection. Remember that high voltage may appear at unexpected points in

defective equipment. Do not float the power supply output to more than 100 volts peak with respect to chassis or earth ground.

c. If the equipment under test is “off” (and that equipment uses high voltage in any of its circuits under normal operation), di scharge

high-voltage capacitors before making connections or tests. Some circuits retain high voltage long after the equipment is turned

off.

2. 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.

3. Don’t expose high voltage needlessly. Remove housings and covers only when necessary. Turn off equipment while making test

connections in high-voltage circuits. Discharge high-voltage capacitors after removing power.

(continued on inside back cover)

TABLE OF CONTENTS

Page

TEST INSTRUMENT SAFETY --------------inside front cover

INTRODUCTION ------------------------------------------------- 4

FEATURES -------------------------------------------------------- 5

SPECIFICATIONS ------------------------------------------------ 6

CONTROLS AND INDICATORS------------------------------- 8

OPERATING INSTRUCTIONS --------------------------------10

Safety Precautions ---------------------------------------------10

Equipment Precautions ----------------------------------------10

Hook-Up --------------------------------------------------------10

Typical Constant Voltage Operation-------------------------13

Setting Current Limit ------------------------------------------14

Typical Constant Current Operation -------------------------15

Constant Voltage/Constant Current Characteristic ---------16

Connecting Two Power Supplies in Series ------------------16

Connecting Two Power Supplies in Parallel ----------------19

Page

APPLICATIONS------------------------------------------------ 20

General -------------------------------------------------------- 20

Electronics Servicing ---------------------------------------- 20

Electronics Manufacturing ---------------------------------- 20

Electronics Design Lab -------------------------------------- 20

Electronics Education---------------------------------------- 21

Battery Charging --------------------------------------------- 21

MAINTENANCE ----------------------------------------------- 22

Fuse Replacement -------------------------------------------- 22

Line Voltage Conversion ------------------------------------ 22

Adjustments--------------------------------------------------- 22

1745A/1744A Calibration ----------------------------------- 23

Instrument Repair Service----------------------------------- 23

WARRANTY SERVICE INSTRUCTIONS ----------------- 25

LIMITED TWO-YEAR WARRANTY ----------------------- 26

SPANISH MANUAL ------------------------------------------- 28

INTRODUCTION

The B+K Precision Models 1744A & 1745A DC Power

Supplies are high quality, general purpose dc power sources.

They provide 0-35 volts dc output, adjustable with both coarse

and fine voltage controls for precise settability. The current

output is 0-10 amps, adjustable with both coarse and fine current

controls (model 1745A). Two large LED meters continuously

monitor the output voltage and current (model 1745A). The

VOLTAGE meter is green, while the CURRENT meter is red

(model 1745A).

These models exhibit 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.

These instruments may be used in constant voltage or constant

current applications. The crossover from constant voltage to

constant current modes is smooth and automatic. LED’s 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 5% to 100% of maximum.

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

voltage, 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-70 volt power source, or

two supplies may be connected in parallel, with suitable

balancing resistors, for up to twice the output current.

These power supplies are well suited for a wide variety of

electrical and electronics applications, including service

shops, engineering labs, production testing, school

laboratories, and home use by hobbyists.

FEATURES

0-35 VOLTS

Continuously variable over 0-to-35 volts with coarse & fine controls.

0-10 AMPS

0-to-10 amps current rated for continuous duty at full output current.

Coarse and fine current adjust controls.

LABORATORY QUALITY

Excellent regulation, low ripple.

CONSTANT VOLTAGE OR CONSTANT CURRENT

Provides regulated dc voltage output or regulated dc current output.

Crossover is smooth and automatic.

LED DISPLAYS (model 1745A)

Two large, easy-to-read LED digit displays monitors output voltage

and output current, and provides good visibility in bright or low

light.

Two Current Ranges (model 1744A)

High-Low switch selects full output (0-10A), or on quarter

output (0-2.2A). Low range improves current settability and

meter resolution.

LED INDICATORS

Act as pilot light and identify mode of operation and metering.

PRE-REGULATOR

Limits internal dissipation for higher reliability.

ISOLATED OUTPUT

Either polarity may be floated or grounded.

OVERLOAD PROTECTION

Fully adjustable current limiting (from 5% to 100% of

maximum output current) protects circuit under test and the

power supply.

REVERSE POLARITY PROTECTION

Prevents damage to power supply from external voltage of

reverse polarity.

STYLING

Modern functional styling. Logical, convenient layout of

controls.

SPECIFICATIONS

OUTPUT VOLTAGE: 0 to 35 VDC, coarse and fine

adjustment.

OUTPUT CURRENT: 0 to 10 A, coarse and fine

adjustment.

CONSTANT VOLTAGE OPERATION

Voltage Regulation

Line (108-132 V): ≤ 0.2% +2 mV

Load (no load to full load): ≤0.04% + ≤0.04% + 2 mV

Recovery Time: ≤100 μs typical.

Ripple Voltage

RMS: ≤1 mV.

Temperature Coefficient

(0° to +40 °C): ≤300 PPM/°C

CONSTANT CURRENT OPERATION

Adjustable Current Limits: 5% to 100%

Current Regulation

Line (108-132 V): ≤0.4% + 5 mA

Load ≤0.4% + 5 mA

Current Ripple: ≤3 mA typical.

METERING

Model 1745A

Voltmeter 4 digit Green LED Display

Range: 0 to 99.99 V.

Accuracy: (0.7% + 9 digits)

Ammeter 4 digit Red LED Display

Hi Range: 0 to 9.999 A.

Accuracy: (0.7% + 9 digits).

Model 1744A

Voltmeter Range: 0 to 40 V

Accuracy: +2.5%

Ammeter Hi Range: 0 to 11 A

Lo Range: 0 to 2.2 A.

Accuracy: +2.5%

AC INPUT:

Domestic: 120 VAC ±10%, 60 Hz

International: 120/220/230/240 VAC - 10%, 50/60 Hz

POWER CONSUMPTION: Approximately 420 W or less at

full load.

PROTECTION: Reverse polarity protection,

Current limiting.

SPECIFICATIONS

NOTE: Specifications and information are subject to change without notice. Please visit www.bkprecision.com for the most current

product information.

Note 1:

Important: Even with noticeable Thermal Drift, this high resolution power supply will be considerably more accurate than any standard

three digit display bench power supply.

Thermal Drift: Since this power supply has greater resolution than standard bench power supplies they are more susceptible to Thermal

Drift. Thermal Drift occurs on almost every type of power supply but is more apparent on high resolution types. Thermal Drift results in the

metering of the power supply to either slowly increase or decrease with the change in the power supply’s internal temperature. As the power

supply outputs more power its internal temperature will increase causing the metering (primarily the current) to slowly increase. As the

power demand is deceased the power supply will cool causing the metering (primarily the current) to slowly decrease. If the power supply

remains with a constant output of power for more than fifteen minutes the power supply metering will remain constant and should not

continue to drift.

TEMPERATURE RANGE

Operation: 0° to +40° C, ≤75% R.H.

Storage: -15° to +70° C,≤85% R.H.

DIMENSIONS (HxWxD): 5.7” x 10.5” x 15” (145 x 267 x 38 mm)

WEIGHT: 27 lb. (12.25 kg)

ACCESSORIES SUPPLIED: Instruction Manual,

Spare Fuse

CONTROLS AND INDICATORS

INDICATORS

Either the “CC” or “CV” and the LED indicators will be lit

whenever the unit is operating, thus serving as a pilot light. The unit

automatically changes from CV to CC operation when the preset

current limit is reached.

1. C.C. (Constant Current) Indicator. Red LED lights in constant

current mode. Unit regulates output current at value set by CUR-

RENT controls.

2. C.V. (Constant Voltage) Indicator. Green LED lights in constant

voltage mode. Unit regulates output voltage at value set by

VOLTAGE controls.

3. GREEN LED Display (1745A). 4 digit display continuously

monitors voltage.

4. RED LED Display (1745A). 4 digit display continuously

monitors current.

VOLTAGE CONTROLS

5. Coarse Control. Coarse adjustment of output voltage. Read value

on GREEN LED display.

6. Fine Control. Fine adjustment of output voltage. Read value on

GREEN LED display.

CURRENT CONTROL

7. Coarse CURRENT Control. Adjusts current limit in

constant voltage mode. Adjusts constant current value

in constant current mode. Current can be read from

RED LED display.

8. Fine Control (1745A). Fine adjustment of current limit

or current value. Current can be read from RED LED

display.

OUTPUT TERMINALS

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

10. GND Terminal. Earth and chassis ground.

11. “-”Terminal (Black). Negative polarity output

terminal.

REAR PANEL CONTROLS

12. Fuse

13. Power Cord

CONTROLS AND INDICATORS

Figure 1. Front Panel Controls and Indicators.

Figure 2. Rear Panel

REAR PANEL CONTROLS

7. Fuse.

8. Power Cord.

9. 110/220 Line Voltage Conversion Switch.

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 35 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 serious

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. Most transistors and integrated circuits will not

withstand voltage of 35 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.

HOOK-UP

1. Turn off the power supply and the equipment to be

powered during hook-up.

2. Connect the positive polarity of the device being powered

to the red (+) terminal of the power supply.

3. Connect the negative polarity of the device being powered

to the black (-) terminal of the power supply.

4. Fig. 3 illustrates the grounding possibilities.

a. If the negative polarity of the equipment or circuit

being powered is also the chassis or common, it may be

grounded to earth by strapping the black (-) terminal to

the green ( ) terminal as shown in Fig. 3A.

b. Similarly, the positive polarity can be grounded by

strapping the red (+) terminal to the green ( ) terminal

as shown in Fig. 3B.

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