BK Precision 1744A, Instruction Manual

Page 1: ...0 35 V 0 10 A DC POWER SUPPLY With Dual Displays INSTRUCTION MANUAL Model 1744A 1745A...

Page 2: ...us 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 t...

Page 3: ...on 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...

Page 4: ...it 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 maxim...

Page 5: ...s 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 resolutio...

Page 6: ...s 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 Ammete...

Page 7: ...s 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...

Page 8: ...ously 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 Fin...

Page 9: ...9 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...

Page 10: ...ild 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...

Page 11: ...OPERATING INSTRUCTIONS 11 Figure 3 A and B Grounding Possibilities...

Page 12: ...12 OPERATING INSTRUCTIONS Figure 3 C and D Grounding Possibilities...

Page 13: ...the circuit can result from reverse polarity Use color coded hook up leads for convenience in identifying polarity red for and black for 6 Make sure that the hook up leads offer sufficient current ca...

Page 14: ...ion of the VOLTAGE control will not increase the output voltage SETTING CURRENT LIMIT 1 Determine the maximum safe current for the device to be powered 2 Temporarily short the and terminals of the pow...

Page 15: ...power supply and connect it to the device to be powered 5 Turn on the power supply The CC indicator should light 6 Increase the Coarse and Fine CURRENT control setting until the desired constant curr...

Page 16: ...tage mode automatically occurs from a decrease in load A good example of this would be seen when charging a 12 volt battery Initially the open circuit voltage of the power supply may be preset for 13...

Page 17: ...OPERATING INSTRUCTIONS Figure 8 Connecting Two Power Supplies in Series 17...

Page 18: ...18 OPERATING INSTRUCTIONS Figure 9 Connecting Two Power Supplies in Parallel...

Page 19: ...lue Then when the load is connected set the VOLTAGE controls on the two power supplies for equal voltage readings This should also provide approximately equal current from each supply Add the two curr...

Page 20: ...such as checking the effect of AGC bias in a television receiver This requires an isolated dc power supply such as the Model 1745A or 1744A The equipment being tested may contain its own power supply...

Page 21: ...and voltage meter simultaneously is a great aid in such experiments BATTERY CHARGING The power supply can be used as a battery charger to restore the charge in rechargeable batteries such as lead aci...

Page 22: ...2 OPERATION FUSE VALUE TYPE 120 V 6 A SLOW BLOW 220 230 240 V 3 A SLOW BLOW Table 1 Fuse Values LINE VOLTAGE CONVERSION INTERNATIONAL UNITS The primary winding of the power transformer is tapped to p...

Page 23: ...lts on the Multimeter Adjust upper GREEN R304 for a front panel meter reading of 35 00 volts on the GREEN VOLTAGE meter 1 Set the front panel Coarse VOLTAGE control for a reading of 04 00 to 06 00 vol...

Page 24: ...MAINTENANCE Figure 11 Location of Adjustments 24...

Page 25: ...unt must include payment in the form of a money order or credit card For the most current repair charges please visit www bkprecision com and click on service repair Return all merchandise to B K Prec...

Page 26: ...om within fifteen 15 days of purchase Exclusions This warranty does not apply in the event of misuse or abuse of the product or as a result of unauthorized alterations or repairs The warranty is void...

Page 27: ...off switch fuses power transformer etc any time the equipment is connected to an ac outlet 7 B K Precision products are not authorized for use in any application involving direct contact between our...

Page 28: ...22820 Savi Ranch Parkway Yorba Linda CA 92887 www bkprecision com 2014 B K Precision Corp V072914 Printed in Taiwan...