BK Precision 1744A Instruction Manual
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BK Precision 1744A Instruction Manual

BK Precision 1744A Instruction Manual

0-35 v, 0-10 a dc power supply with dual displays
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INSTRUCTION
MANUAL
Model 1744A & 1745A
0-35 V, 0-10 A
DC POWER SUPPLY
With Dual
Displays

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Summary of Contents for BK Precision 1744A

  • Page 1 INSTRUCTION MANUAL Model 1744A & 1745A 0-35 V, 0-10 A DC POWER SUPPLY With Dual Displays...

  • Page 2: Test Instrument Safety

    TEST INSTRUMENT SAFETY WARNING Normal use of test equipment exposes you to a certain amount of danger from electrical shock because testing must sometimes b e 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.

  • Page 3: Table Of Contents

    Fuse Replacement -------------------------------------------- 22 Line Voltage Conversion ------------------------------------ 22 OPERATING INSTRUCTIONS -------------------------------- 10 Adjustments --------------------------------------------------- 22 Safety Precautions --------------------------------------------- 10 1745A/1744A Calibration ----------------------------------- 23 Equipment Precautions ---------------------------------------- 10 Instrument Repair Service ----------------------------------- 23 Hook-Up -------------------------------------------------------- 10 Typical Constant Voltage Operation ------------------------- 13...

  • Page 4: Introduction

    INTRODUCTION The B+K Precision Models 1744A & 1745A DC Power Current limits are adjustable from 5% to 100% of maximum. Supplies are high quality, general purpose dc power sources. In constant current applications, the maximum voltage may They provide 0-35 volts dc output, adjustable with both coarse be preset.

  • Page 5: Features

    Two large, easy-to-read LED digit displays monitors output voltage reverse polarity. and output current, and provides good visibility in bright or low light. STYLING Two Current Ranges (model 1744A) Modern functional styling. Logical, convenient layout of High-Low switch selects full output (0-10A), or on quarter controls.

  • Page 6: Specifications

    Voltage Regulation Accuracy: (0.7% + 9 digits). ≤ 0.2% +2 mV Line (108-132 V): ≤0.04% + ≤0.04% + 2 mV Load (no load to full load): Model 1744A Voltmeter Range: 0 to 40 V ≤100 μs typical. Recovery Time: Accuracy: +2.5%...
  • Page 7 SPECIFICATIONS TEMPERATURE RANGE WEIGHT: 27 lb. (12.25 kg) 0° to +40° C, ≤75% R.H. Operation: Storage: -15° to +70° C,≤ 85% R.H. ACCESSORIES SUPPLIED: Instruction Manual, Spare Fuse 5.7” x 10.5” x 15” (145 x 267 x 38 DIMENSIONS (HxWxD): NOTE: Specifications and information are subject to change without notice.

  • Page 8: Controls And Indicators

    CONTROLS AND INDICATORS INDICATORS CURRENT CONTROL Either the “CC” or “CV” and the LED indicators will be lit Coarse CURRENT Control. Adjusts current limit in whenever the unit is operating, thus serving as a pilot light. The unit constant voltage mode. Adjusts constant current value automatically changes from CV to CC operation when the preset in constant current mode.
  • Page 9 CONTROLS AND INDICATORS REAR PANEL CONTROLS 7. Fuse. 8. Power Cord. 9. 110/220 Line Voltage Conversion Switch. Figure 1. Front Panel Controls and Indicators. Figure 2. Rear Panel...

  • Page 10: Operating Instructions

    OPERATING INSTRUCTIONS SAFETY PRECAUTIONS Do not exceed the voltage rating of the circuit being powered. Most transistors and integrated circuits will not Use only a polarized 3-wire ac outlet. This assures that the power withstand voltage of 35 volts. supply chassis, case, and ground terminal are connected to a good earth ground and reduces danger from electrical shock.
  • Page 11 OPERATING INSTRUCTIONS Figure 3 (A and B). Grounding Possibilities.
  • Page 12 OPERATING INSTRUCTIONS Figure 3 (C and D). Grounding Possibilities.

  • Page 13: Typical Constant Voltage Operation

    OPERATING INSTRUCTIONS c. If an earth ground reference is not required, the configuration of Fig. 3Bmay be used. The scheme in Fig. 3C should also be used where it is not known whether the chassis is common with either the positive or negative polarity.

  • Page 14: Setting Current Limit

    OPERATING INSTRUCTIONS 5. . Increase the VOLTAGE setting until the Voltage LED display reads the desired value. The FINE control permits easier setting to a specific value. Note the load current on the Current LED display. If the load current exceeds the preset current limit, the CV indicator will go off and the CC indicator will light.

  • Page 15: Typical Constant Current Operation

    OPERATING INSTRUCTIONS TYPICAL CONSTANT CURRENT OPERATION 1. Before connecting the device to be powered to the power supply, determine the maximum safe voltage to be applied, and set the VOLTAGE controls to obtain that voltage reading on the Voltage LED display. 2.

  • Page 16: Constant Voltage/Constant Current Characteristic

    CONNECTING TWO POWER SUPPLIES IN SERIES and the CC indicator comes on. Two Model 1744A or 1745A power supplies may be Similarly, crossover from the constant current to the constant voltage connected in series to provide a variable 0-70 volt output. In mode automatically occurs from a decrease in load.
  • Page 17 OPERATING INSTRUCTIONS Figure 8. Connecting Two Power Supplies in Series.
  • Page 18 OPERATING INSTRUCTIONS Figure 9. Connecting Two Power Supplies in Parallel.

  • Page 19: Connecting Two Power Supplies In Parallel

    OPERATING INSTRUCTIONS CONNECTING TWO POWER SUPPLIES IN PARALLEL If the current equalizing resistors are not well matched, it is preferable that the voltages be slightly unbalanced to achieve Two power supplies may be connected in parallel to double the current balance. Be sure that the supplies are adequately maximum load current.

  • Page 20: Applications

    This requires an isolated dc power specification will cause the CC indicator to light, and the unit can be rejected. supply, such as the Model 1745A or 1744A.

  • Page 21: Electronics Design Lab

    APPLICATIONS ELECTRONICS DESIGN LAB BATTERY CHARGING The technician or engineer working in an engineering laboratory The power supply can be used as a battery charger to requires a dc power supply to power breadboard and prototype restore the charge in rechargeable batteries such as lead-acid, circuits.

  • Page 22: Maintenance

    MAINTENANCE WARNING LINE VOLTAGE CONVERSION, INTERNATIONAL UNITS The following instructions are for use by qualified personnel only. To avoid electrical shock, do not perform any servicing other than The primary winding of the power transformer is tapped to contained in the operating instructions unless you are qualified to do permit operation from 120/220/230 or 240 VAC, 50/60 Hz line voltage.

  • Page 23: 1745A/1744A Calibration

    MAINTENANCE CALIBRATION 1. Set the front panel Coarse VOLTAGE control for a If readjustment is required, use the following procedure. Locations reading of 04.00 to 06.00 volts on the GREEN of the adjustments are shown in Fig. 11. VOLTAGE meter. 2.
  • Page 24 MAINTENANCE Figure 11. Location of Adjustments.

  • Page 25: Warranty Service Instructions

    Service Information Warranty Service: Please return the product in the original packaging with proof of purchase to the address below. Clearly state in writing the performance problem and return any leads, probes, connectors and accessories that you are using with the device. Non-Warranty Service: Return the product in the original packaging to the address below.

  • Page 26: Limited Two-Year Warranty

    Limited Two-Year Warranty B&K Precision Corp. warrants to the original purchaser that its products and the component parts thereof, will be free from defects in workmanship and materials for a period of two years from date of purchase. B&K Precision Corp. will, without charge, repair or replace, at its option, defective product or component parts. Returned product must be accompanied by proof of the purchase date in the form of a sales receipt.
  • Page 27 TEST INSTRUMENT SAFETY (continued from inside front cover) 4. If possible, familiarize yourself with the equipment being tested and the location of its hig h voltage points. However, remember that high voltage may appear at unexpected points in defective equipment. 5.

  • Page 28: Spanish Manual

    22820 Savi Ranch Parkway Yorba Linda, CA 92887 www.bkprecision.com © 2014 B&K Precision Corp. V072914 Printed in Taiwan...

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1745a

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