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Summary of Contents for BK Precision 1760A
- Page 1 INSTRUCTION MANUAL MODELS: 1760A, 1761, 1762 Triple Output DC POWER SUPPLY With Dual 4-Digit LED Displays...
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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 be performed where exposed high voltage is present. An electrical shock causing 10 milliamps of current to pass through the hear t will stop most human heartbeats. - Page 3 Instruction Manual For Models 1760A, 1761, 1762 Triple Output DC Power Supplies With Dual 4-Digit LED Displays 22820 Savi Ranch Parkway Yorba Linda, CA 92887 www.bkprecision.com...
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Page 4: Table Of Contents
TABLE OF CONTENTS page Page TEST INSTRUMENT SAFETY ------------- inside front cover APPLICATION ---------------------------------------------------- 33 General -------------------------------------------------------------- 33 INTRODUCTION ------------------------------------------------ 5 Electronics Servicing ---------------------------------------------- 33 Electronics Manufacturing ---------------------------------------- 33 FEATURES ------------------------------------------------------- 7 Electronics Design Lab -------------------------------------------- 34 Electronics Education --------------------------------------------- 34 SPECIFICATIONS ---------------------------------------------- 8 Battery Charging --------------------------------------------------- 34 Split Supply --------------------------------------------------------- 34... -
Page 5: Introduction
INTRODUCTION In constant current applications, the maximum voltage may These B+K Precision Triple Output DC Power Supplies are high quality, general purpose DC power sources. They provide two “main” be preset. When load variations cause current to drop below supplies and a “third” auxiliary output with a 4-6.5V (2-6.5V for the regulated value, the unit reverts to regulated voltage models 1761 &... - Page 6 The features and versatility of the unit, especially the triple output The same features that make the Model 1760A a good and tracking features, make it an ideal general purpose power choice for an engineering lab also make it a good choice for supply for engineering lab applications.
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Page 7: Features
DC current output. Crossover is smooth and automatic. ONE 4-6.5 V (1760A) or 2-6.5 V (1761 & 1762) SUPPLY LED DISPLAY Durable 0-to-5 amp supply is ideal for use with most digital logic circuitry. -
Page 8: Specifications
±0.5% + 9 digits.* 0V to 60V (model 1762) Panel Meter Accuracy (Current): Output Current Limit Range: ±0.5% + 9 digits.* 0.1A to 2A (model 1760A and 1762) (* see note 1) 0.1A to 3A (model 1761) “Third” SUPPLY Load Regulation (Constant Voltage): ≤0.01% + 3 mV... - Page 9 SPECIFICATIONS GENERAL Dimensions (H x W x D): AC Input: 5.7" x 10.5" x 15" (145 mm x 267 mm x 381 mm) Weight: Domestic: 120 VAC + 10%, 60 Hz International: 120/220/230/240 VAC -* 10%, 50/60 Hz 10 kg (21 lbs) Power Consumption (Fully Loaded): Accessories Supplied: Approximately 350 W...
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Page 10: Controls And Indicators
CONTROLS AND INDICATORS 0-30V/4-6.5V Switch. Controls “A”/4-6.5V LED GENERAL CONTROLS AND INDICATORS Display. When this switch is in the 0-30V position (out), the LED display monitors the “A” (0-30 V) POWER Switch. Turns power on and off. TRACKING Mode Switches. Two pushbutton switches that supply. - Page 11 CONTROLS AND INDICATORS Fig. 1. Front Panel Controls and Indicators.
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Page 12: A" Supply Controls And Indicators
CONTROLS AND INDICATORS “A” SUPPLY CONTROLS AND INDICATORS 14. CURRENT Control. Adjusts current limit of “A” supply in constant voltage mode. Adjusts constant current value of “A” supply in constant current mode. 10. C.C. (Constant Current) Indicator. Red LED lights when “A”... -
Page 13: Rear Panel Controls
CONTROLS AND INDICATORS 20. Coarse VOLTAGE Control. Coarse adjustment of the output Terminal (Green). Earth and Chassis Ground. voltage of the “B” supply when the INDEPendent mode is 27. “-” Terminal (Black). Negative polarity output terminal for the “B” supply. Also serves as the negative selected. -
Page 14: Operating Instructions
OPERATING INSTRUCTIONS SAFETY PRECAUTIONS EQUIPMENT PRECAUTIONS Avoid using the power supply in ambient temperatures above CAUTION +40° C. Always allow sufficient air space around the heat sink at the rear of the power supply for effective radiation to prevent Avoid contacting the heat sink at the rear of the internal heat build-up. -
Page 15: Hook-Up
OPERATING INSTRUCTIONS Hook-up b. Similarly, the positive polarity can be grounded by strapping the red (+) terminal to the green ( ) 1. Disengage the INDEP/TRACK mode switch so that the terminal as shown in Fig. 3B. power supply is in the INDEPendent operating mode. c. - Page 16 OPERATING INSTRUCTIONS Fig. 3. Independent Operation Grounding Possibilities.
- Page 17 OPERATING INSTRUCTIONS Fig. 3. Independent Operation Grounding Possibilities.
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Page 18: Typical Constant Voltage Operation
OPERATING INSTRUCTIONS Typical Constant Voltage Operation 1. Before connecting the device to be powered to the power supply, determine the maximum safe load current for the device to be powered and set the current limit value (see “Setting Current Limit” procedure in this section). 2. -
Page 19: Setting Current Limit
OPERATING INSTRUCTIONS Setting Current Limit 1. Determine the maximum safe current for the device to be powered. 2. Temporarily short the (+) and (-) terminals of the power supply together with a test lead. 3. Rotate the Coarse VOLTAGE control away from zero sufficiently for the CC indicator to light. -
Page 20: 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, set the meter selection switch to the V position, and set the VOLTAGE controls to obtain that voltage reading on the LED display. 2. -
Page 21: Constant Voltage/Current Characteristic
OPERATING INSTRUCTIONS Constant Voltage/Constant Current Characteristic The working characteristic of this power supply is called a constant voltage/constant current automatic crossover type. This permits continu- ous transition from constant current to constant voltage modes in re- sponse to the load change. The intersection of constant voltage and constant current modes is called the crossover point. -
Page 22: Series Tracking Operation
OPERATING INSTRUCTIONS SERIES TRACKING OPERATION 1. Set the 0-30 V/4-6.5 V switch to the 0-30 V position, the “B” V/A switch to the V (voltage When the series tracking mode of operation is selected, the positive (red) terminal of the “B” supply output is internally connected to the metering) position, and the “A”... - Page 23 OPERATING INSTRUCTIONS Fig. 8. Series Tracking Operation Grounding Possibilities...
- Page 24 OPERATING INSTRUCTIONS Fig. 8. Series Tracking Operation Grounding Possibilities...
- Page 25 OPERATING INSTRUCTIONS a. Similarly, the positive polarity can be grounded by strapping the red (+) terminal of the “A” supply to the green terminal of the “A” supply as shown in Fig. 8B. b. If “split supply” operation is desired, a positive and negative voltage with a center ground can be achieved by strapping the black (-) terminal of the “A”...
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Page 26: Parallel Tracking Operation
OPERATING INSTRUCTIONS 9. Observe proper polarity. If the circuit being powered is not equipped with 1. Adjust the output voltage to the desired level using the “A” VOLTAGE controls. reverse polarity protection, damage to the circuit can result from reverse polarity. - Page 27 OPERATING INSTRUCTIONS Fig. 9. Parallel Tracking Operation Grounding Possibilities...
- Page 28 OPERATING INSTRUCTIONS Fig. 9. Parallel Tracking Operation Grounding Possibilities...
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Page 29: 4-6.5 V Power Supply Operation
OPERATING INSTRUCTIONS 9. Observe proper polarity. If the circuit being powered is not 1. Fig. 10 illustrates the grounding possibilities of the 4-6.5V equipped with reverse polarity protection, damage to the circuit supply. can result from reverse polarity. Use color coded hook-up leads, a. - Page 30 OPERATING INSTRUCTIONS Fig. 10. Grounding Possibilities for 4-6.5 V Power Supply...
- Page 31 OPERATING INSTRUCTIONS Fig. 10. Grounding Possibilities for 4-6.5 V Power Supply...
- Page 32 OPERATING INSTRUCTIONS 10. If the red OVERload indicator lights, too much load has been placed NOTE on the supply. This will cause voltage and current to drop and prevent proper operation of the 4-6.5V supply. To correct this If decreasing the load does not cause situation, the load on the supply must be decreased so that no more the overload indicator to turn off, the than 5 amps of current are required.
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Page 33: Application
0-30V (1760A), 0-35V (1761), or present in the circuit. One polarity of the power supply 0-60V (1762) and 0-2A (1760A and 1762) or 0-3A (1761) and the output is floated to an appropriate point in the circuit, such as 4-6.5V (1760A) or 2-6.5V (1761 &... -
Page 34: Electronics Design Lab
SPLIT SUPPLY Frequently, “split power supplies” are required for a power supply. amplifier and other electronic circuits. The Model 1760A is ideally suited for “split power supply” operation. This BATTERY CHARGING The power supply can be used as a battery charger to restore the... - Page 35 APPLICATIONS Two Identical Positive Voltages With a Common Negative (Refer To Fig. 11) Some electronic equipment requires two identical positive voltages with a common negative. A good example of this would be a digital car clock where there are two +12 volt inputs and a common negative.
- Page 36 APPLICATIONS Two Differing Positive Voltages With a Common Negative (Refer To Fig. 12) Many electronic circuits require two different positive voltages with a common negative. A typical example of this would be a device that uses both TTL (+5 V) and analog (typically +15 V) circuitry.
- Page 37 APPLICATIONS Two Identical Negative Voltages With a Common Positive (Refer To Fig. 13) When the same negative voltage is required at two points in the same circuit and a common positive is needed, perform the following: 1. Connect the ground strap between the positive terminal and the ground of the “A”...
- Page 38 APPLICATIONS Two Differing Negative Voltages With a Positive Common (Refer To Fig. 14) Using both supplies, two differing negative voltages with a common positive are obtained as follows: 1. Select the INDEPendent operating mode and set up the LED displays so that both displays monitor voltage. 2.
- Page 39 APPLICATIONS Identical Positive and Negative Voltages With a Separate Common (Refer To Fig. 15) Another typical “split supply” application is when a circuit u ses operational amplifiers (op-amps). Typically, identical positive and negative voltages are required to power op-amp circuits. Using both supplies and the series tracking mode of operation, identical positive and negative voltages with a separate common are obtained as follows: 1.
- Page 40 APPLICATIONS Differing Positive and Negative Voltages With a Separate Common (Refer To Fig. 16) Using both supplies and the series tracking mode of operation, different positive and negative voltages with a separate common utilizing the variable “B tracks A” mode of operation are obtained as follows: 1.
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Page 41: Maintenance
MAINTENANCE WARNING LINE VOLTAGE CONVERSION, INTERNATIONAL UNITS The following instructions are for use by qualified personnel This power supply can be switched from 110VAC to only. To avoid electrical shock, do not perform any servicing 220/230/240VAC by a switch located on the rear panel. To select other than contained in the operating instructions unless you are the desired line voltage, simply insert the fuse and fuse holder so qualified to do so. -
Page 42: Adjustments
MAINTENANCE ADJUSTMENTS Table 2. Functions of Calibration Adjustments This unit was accurately adjusted at the factory before FUNCTION OF ADJ LOCATION OF ADJ shipment. Readjustment is recommended only if repairs have “A” SUPPLY +5 V REF. MAIN BOARD been made in a circuit affecting adjustment accuracy, or if you “B”... - Page 43 MAINTENANCE Fig. 18. Location of Adjustments (Main Circuit Board).
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Page 44: 4-6.5 V Supply And 6.5 V Metering Adjustments
MAINTENANCE 1. Connect a 1 Ω load (rated at 30W or more) and the 3. Set the Right V/A switch to the A position. 4. Connect the external multimeter across the “A” SUPPLY multimeter in series across the output terminals of the 4- output terminals to read the output current (so that the meter 6.5V SUPPLY to read the output current. -
Page 45: B" Series Tracking Adjustment
MAINTENANCE 7. Set the “B” Coarse VOLTAGE control for a reading of 1. Connect the multimeter to the “A” SUPPLY outputs approximately 05.0 volts on the “B” LED Display. and measure the voltage. 2. Disconnect the multimeter from the “A” SUPPLY 8. -
Page 46: 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 47: 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 48 TEST INSTRUMENT SAFETY (continued from inside front cover) 4. If possible, familiarize yourself with the equipment being tested and the location of its high voltage points. However, remember that high voltage may appear at unexpected points in defective equipment. 5. Use an insulated floor material or a large, insulated floor mat to stand on, and an insulated work surface on which to place equipment;...
- Page 49 22820 Savi Ranch Parkway Yorba Linda, CA 92887 www.bkprecision.com © 2014 B&K Precision Corp. V072814 Printed in Taiwan...
- Page 50 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: B&K Precision 1760A 1761...
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