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OPERATING INSTRUCTIONS

Fig. 10. Grounding Possibilities for 4-6.5 V Power Supply

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Summary of Contents for 1760A

Page 1: ...INSTRUCTION MANUAL MODELS 1760A 1761 1762 Triple Output DC POWER SUPPLY With Dual 4 Digit LED Displays ...

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 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...

Page 3: ...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 ...

Page 4: ...t Limit 19 Typical Constant Current Operation 20 Constant Voltage Current Characteristic 21 Series Tracking Operation 22 Parallel Tracking Operation 26 4 6 5 V Power Supply Operation 29 Page APPLICATION 33 General 33 Electronics Servicing 33 Electronics Manufacturing 33 Electronics Design Lab 34 Electronics Education 34 Battery Charging 34 Split Supply 34 MAINTENANCE 41 Fuse Replacement 41 Line Vo...

Page 5: ...ications 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 o...

Page 6: ...y be used as a battery eliminator or to power individual circuit boards or cards while removed from the system Its output can be evaluated while powering a breadboard or prototype circuit to determine the circuit s power supply requirements Its laboratory quality specifications will meet most engineering laboratory requirements The same features that make the Model 1760A a good choice for an engin...

Page 7: ...and allows use of A and B supplies combined as one supply SINGLE 0 30V 4A model 1760A 0 35V 6A model 1761 or 0 60V 4A model 1762 SUPPLY Parallel tracking feature doubles output current capability and allows use of A and B supplies combined as one supply CONSTANT VOLTAGE OR CONSTANT CURRENT The A and B supplies provide regulated DC voltage output or regulated DC current output Crossover is smooth a...

Page 8: ...e 300 ppm C Load Regulation Constant Current 0 2 3mA Line Regulation 108 132 V Constant Current 0 2 3mA Ripple Current at 108 V for Constant Current 3mA RMS Tracking Series Accuracy 0 2 10mV Tracking Series B tracks A 5 to 100 Panel Meter Accuracy Volts 0 5 9 digits Panel Meter Accuracy Current 0 5 9 digits see note 1 Third SUPPLY Output Voltage Range 4V to 6 5V 2V to 6 5V model 1761 Load Regulati...

Page 9: ...er 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 outpu...

Page 10: ...The A and B outputs can be used as two individual but tracking power supplies or just the A output can be used as a 0 to 30 volt supply with a 4 A capability 3 0 30V 4 6 5V Switch Controls A 4 6 5V LED Display When this switch is in the 0 30V position out the LED display monitors the A 0 30 V supply When this switch is in the 4 6 5V position in the LED display monitors the 4 6 5V supply 4 Right V ...

Page 11: ...11 CONTROLS AND INDICATORS Fig 1 Front Panel Controls and Indicators ...

Page 12: ...arallel or series tracking mode is selected Read the value on the A 4 6 5 V LED Display when the voltage V and master 0 30 V metering modes are selected 14 CURRENT Control Adjusts current limit of A supply in constant voltage mode Adjusts constant current value of A supply in constant current mode Current can be read from the A 4 6 5V LED Display when the current A and master 0 30V metering modes ...

Page 13: ...rent value of B supply in constant current mode Current can be read from the B LED Display when the current A metering mode is selected 23 Left V A Switch Selects current or voltage metering mode for the 0 30 V B supply When in the A amps position in current is read form the B LED Display When in the V volts position out voltage is read form the B LED Display 24 B LED Display Digital display indic...

Page 14: ...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...

Page 15: ...ilarly the positive polarity can be grounded by strapping the red terminal to the green terminal as shown in Fig 3B c If an earth ground reference is not required the configuration of Fig 3C may 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 d If the chassis or common of the equipment being powered ...

Page 16: ...16 OPERATING INSTRUCTIONS Fig 3 Independent Operation Grounding Possibilities ...

Page 17: ...17 OPERATING INSTRUCTIONS Fig 3 Independent Operation Grounding Possibilities ...

Page 18: ...dure in this section 4 Turn on POWER switch The CV indicator should light 5 Set the meter selection switch to the V position to select the voltage metering mode 6 Increase the VOLTAGE setting until the LED display reads the desired value The Fine control permits easier setting to a specific value 7 Set the meter selection switch to the A position to select the current metering mode and note the lo...

Page 19: ...ntrol away from zero sufficiently for the CC indicator to light 4 Set the meter selection switch to the A position to select the current metering mode 5 Adjust the CURRENT control for the desired current limit Read the current value on the LED display 6 The current limit overload protection has now been preset Do not change the CURRENT control setting after this step 7 Remove the short between the...

Page 20: ...cator should light if the load is greater than 5 of full scale NOTE The CC indicator will not light if the load is less than 5 of full scale or approximately 0 1A 6 Set the meter selection switch to the A position to obtain the current metering mode 7 Increase the CURRENT control setting until the desired constant current value is read on the display or set the current limit in advance before conn...

Page 21: ...rent limit is reached At that point the output current becomes constant and the output voltage drops in proportion to further increases in load The crossover point is indicated by the front panel LED indicators The crossover point is reached when the CV indicator goes off and the CC indicator comes on Similarly crossover from the constant current to the constant voltage mode automatically occurs f...

Page 22: ...are putting out the same voltage The actual output current would be the value read from the A LED Display 8 Set the power supplies to the TRACKING SERIES mode by engaging the INDEP TRACK switch and releasing the SER PAR switch 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 metering position and the A V A switch to the A current metering position 2 Set the ...

Page 23: ...23 OPERATING INSTRUCTIONS Fig 8 Series Tracking Operation Grounding Possibilities ...

Page 24: ...24 OPERATING INSTRUCTIONS Fig 8 Series Tracking Operation Grounding Possibilities ...

Page 25: ...manual for more information on split supply operation NOTE If one of the supplied ground straps is to be used only use it in one of these three ways Connecting two ground straps could ground both the positive and negative terminals and load down the power supply causing improper operation c If an earth ground reference is not required the configuration of Fig 8D may be used The scheme in Fig 8D sh...

Page 26: ...he B supply track the A supply the maximum current and voltage are set using the A controls Using the A supply output jacks follow the instructions for Setting Current Limit INDEPENDENT USE OF A OR B SUPPLY paragraph of this section Remember that the actual current output at the A supply output jacks is double the reading on the B LED Display 1 Adjust the output voltage to the desired level using ...

Page 27: ...27 OPERATING INSTRUCTIONS Fig 9 Parallel Tracking Operation Grounding Possibilities ...

Page 28: ...28 OPERATING INSTRUCTIONS Fig 9 Parallel Tracking Operation Grounding Possibilities ...

Page 29: ...l of the 4 6 5V supply 1 Fig 10 illustrates the grounding possibilities of the 4 6 5V supply a If the negative polarity of the equipment or circuit being powered is also the chassis or common it may grounded to earth by connecting a jumper from the black terminal to either green terminal as shown in Fig 10A b Similarly the positive polarity can be grounded by connecting a jumper between the red te...

Page 30: ...30 OPERATING INSTRUCTIONS Fig 10 Grounding Possibilities for 4 6 5 V Power Supply ...

Page 31: ...31 OPERATING INSTRUCTIONS Fig 10 Grounding Possibilities for 4 6 5 V Power Supply ...

Page 32: ... this situation the load on the supply must be decreased so that no more than 5 amps of current are required NOTE If decreasing the load does not cause the overload indicator to turn off the overvoltage protection circuitry has activated In order to return the supply to normal operation the output voltage must be decreased or the external voltage source must be re moved and the power must be momen...

Page 33: ...hese systems should be performed at 28 volts Some servicing applications require the injection of a variable DC voltage for certain tests such as checking the effect of AGC bias in a television receiver This requires an isolated DC power supply such as the Model 1760A The equipment being tested may contain its own power supply and operate from AC power A DC voltage may already be present in the ci...

Page 34: ...s charging specifications for proper voltage and current settings Charging information is sometimes printed on the batteries Battery charging at least initially requires the constant current mode of operation Before connecting the power supply to the battery preset the VOLTAGE controls to the fully charged terminal voltage specified by the battery manufacturer Turn off the power supply while conne...

Page 35: ...lel tracking mode would provide the simplest hook up and operation This type of split supply operation is obtained as follows 1 Connect a ground strap between the A supply s negative terminal and ground 2 Set the desired voltage and maximum current using the A VOLTAGE and CURRENT controls 3 Turn off the power supply and the equipment to be powered during hook up 4 Connect the positive polarity inp...

Page 36: ...g mode and set up the LED displays so that both displays monitor voltage 2 Connect the ground straps between each supplies negative terminal and ground 3 Independently set the desired voltage and maximum current for the A and B supplies using the A VOLTAGE and CURRENT controls and the B VOLTAGE and CURRENT controls respectively 4 Turn off the power supply and the equipment to be powered during hoo...

Page 37: ...ollowing 1 Connect the ground strap between the positive terminal and the ground of the A supply 2 Set the desired voltage and maximum current using the A VOLTAGE and CURRENT controls 3 Turn off the power supply and the equipment to be powered during hook up 4 Connect the negative polarity inputs of the circuit to be powered to the negative black terminals of the supplies Connect the common positi...

Page 38: ...traps between each supplies positive terminal and ground 3 Independently set the desired voltage and maximum current for the A and B supplies using the A VOLTAGE and CURRENT controls and the B VOLTAGE and CURRENT controls respectively 4 Turn off the power supply and the equipment to be powered during hook up 5 Connect the negative polarity inputs of the circuit to be powered to the negative black ...

Page 39: ...eparate common are obtained as follows 1 Select the TRACKing SERies operating mode and set A B Metering switch to monitor the A supply 2 Set the desired voltage using the A VOLTAGE controls 3 Connect a ground wire between the A supply negative terminal and the GND green terminal 4 Turn off the power supply and the equipment to be powered during hook up 5 Connect the positive polarity input of the ...

Page 40: ...inal of the B supply 3 Set the desired voltage for each supply using the VOLTAGE controls Set the maximum current using the CURRENT controls 4 Turn off the power supply and the equipment to be powered during hook up 5 Connect the positive polarity input of the circuit to be powered to the positive red terminal of the A supply and connect the negative polarity of the circuit to the negative termina...

Page 41: ...ate The fuse should not normally open unless a problem has developed in the unit Try to determine and correct the cause of the blown fuse then replace only with a fuse of the correct rating as listed in Table 1 The fuse is located on the rear panel see Fig 2 Table 1 Fuse Values OPERATION FUSE VALUE TYPE 120 V 3 5A Slow Blow 220 230 240 V 1 5A Slow Blow LINE VOLTAGE CONVERSION INTERNATIONAL UNITS T...

Page 42: ...operating mode 3 Set the A VOLTAGE controls both Coarse and Fine to maximum fully clockwise 4 Adjust R6 A SUPPLY 5V REF on the main circuit board located on the right rear side of the supply for a reading as close to 30 40 volts on the multimeter as possible 5 Set the 0 30 V 4 6 5V switch to the 0 30V position and the Right V A switch to the V position Table 2 Functions of Calibration Adjustments ...

Page 43: ...43 MAINTENANCE Fig 18 Location of Adjustments Main Circuit Board ...

Page 44: ... Turn R122 4 6 5V A METER A LIMIT ADJ and R159 4 6 5V 6 8V REF located on the main board fully clockwise 1 Connect a 1 Ω load rated at 30W or more and the multimeter in series across the output terminals of the 4 6 5V SUPPLY to read the output current 2 Adjust the 4 6 5V voltage level control to obtain an output of 5 30 amps read on the multimeter 3 Adjust R122 4 6 5V A METER A LIMIT ADJ so that t...

Page 45: ...ully clockwise 1 Connect the multimeter to the A SUPPLY outputs and measure the voltage 2 Disconnect the multimeter from the A SUPPLY outputs and connect it to the B SUPPLY outputs 3 Adjust R119 SERIES TRACKING ADJ located on the MAIN board until the voltage read from the multimeter is the same as it was across the A SUPPLY output terminals Return the multimeter to the A SUPPLY output terminals an...

Page 46: ...account 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 Precision Corp with pre paid shipping The flat rate repair charge for Non Warranty Service does not include return shipping Return shipping to locations in North American is included for Warranty Serv...

Page 47: ...ion com 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 if the serial number is altered defaced or removed B K Precision Corp shall not be liable for any consequential damages including without limitation damages resulting from loss of use Some states...

Page 48: ...e on 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 product and the human body or for use as a critical component in a life support device or system Here direct contact refers to any connection from or to our equipment via any cabling or switching ...

Page 49: ...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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