DC POWER SUPPLY With LED Display
Contents
1. 6 6 7 HookeUp eerie my or eee s Typical Constant Voltage Operation 10 Setting Current 12 Typical Constant Current Operation 12 Constant Voltage Constant Current Characteristic 13 Using The External Voltmeter Function 14 M o Page APPLICATIONS e eee ses eeosocssoseceesevcoesesevell General setas pass emana SE Electronics Servicing 5 5 17 Electronics Manufacturing Electronics Design 55 5 55555 18 Electronics E 18 Battery Charging eeeeeeeeeeeeee enn nn nn ns 18 MAINTENANCE 2 cece cece eres 19 Fuse Replacement ccccesec cece cern cnc 19 Line Voltage Conversion 19 Adjustments cess esee eee n n n n s 19 Instrument Repair 2 WARRANTY SERVICE INSTRUCTIONS 23 LIMITED ONE YEAR WARRANTY 24 INTRODUCTION The B amp K Precision Model 1635 DC Power Supply is a high quality general purpose dc power source It provides 0 30 volts dc output adjustable with both coarse and fine vol tage controls for precise settability The current output is 0 3 amps A three station pushbutton assembly allows the large panel mounted LED meter di2. EXTERNAL VOLT TIE M Lj 59 CURRENT VOLTAGE a 2 i f ao Hot Grounded common with positive polarity Fig 3 A and Grounding Possibilities Equi Being gt a gt someras O ES IEA petri 48 D rn n e E ue c SS ti nm pment Powered OPERATING INSTRUCTIONS omg DC POWER SUPPLY 1635 gt i c ca 5 f CO C EXTERNAL VOLT METER je EXTERNAL VOLT METER cae ONO T AUSENTE VOLTAGE um ob Se M p Equipment aper pur ARM gor e d E Equipment Being Powered M Being Powered t eo S niter No Strap um qoare e puma use node ined tery C No ground reference D 7 Grounded not common with negative or positive polarity Fig 3 C and D Grounding Possibilities 9 OPERATING INSTRUCTIONS may be grounded to earth by strapping the black terminal to the green GND terminal as shown in Fig 3A b Similarly the positive polarity can be grounded by stra
3. 6 Affix a label showing the correct line voltage and fuse value if changed for the unit after conversion Place this label directly over the factory label ADJUSTMENTS This unit was accurately adjusted at the factory before shipment Readjustment is recommended only if repairs have been made in a circuit affecting adjustment accuracy or if you have a reason to believe the unit is out of adjustment However adjustments should be attempted only if a multi meter with an accuracy of 10 1 or better is available B amp K Precision Model 2817 or equivalent If readjustment is required use the following procedure Locations of the adjustments are shown in Fig 11 MAINTENANCE ot ne ma q rn me F101 101 T101 T101 RG 120V ORG 120V BLK TAN TAN 2 GRAY nov 3 F101 TAN S101 TAN f i BLK AR S GRAY 2 pom 9 les WHT E Lee WHT 3 Uo ORS 120V_ ORG mov GRAY GRAY 110V4 120 V MP es 110 V T dE dr WIRENUT ERR aw t Low T101 Ei edi T101 F101 101 ORG 120V BLK AS a Q9RG 120V RED zu BLK TAN lt TAN GRAY 10V 3 GRAY IN OO oO EE BLK ov i BLK E ca GRN ORG 120V Y 120v 8 a GRAY GRAY 110V y ys E x 2 lt i WHT os voo re Be HONO i AAAA
4. Fig 10 Line Voltage Conversion 20 MAINTENANCE M e ep cece o se ens mm Se SS VaR hw wr we min sont mnt e ie ae fete e eee MAIN BOARD C101 C102 a METERING BOARD VR108 VR10 7 VR105 VR106 VR104 6 6 e Fig 11 Location of Adjustments 21 MAINTENANCE Connect an accurate 40 1 external multimeter to measure the dc voltage at output terminals of the power supply Set the COARSE and FINE VOLTAGE controls to mini mum fully counterclockwise Adjust trimmer pot VR105 for a reading of 0 volts on the multimeter Turn the COARSE and FINE VOLTAGE controls to maximum fully clockwise Adjust trimmer pot VR104 for a reading of 31 5 volts on the multimeter With the V switch on the power supply engaged adjust VR201 for a reading of 31 5 on the LED display Set the CURRENT control to minimum fully counter clockwise Connect the external multimeter to measure dc current at the output terminals of the power supply Select a current range capable of measuring at least 3 2 amps 22 10 11 12 13 Set the COARSE and FINE VOLTAGE controls to a centered position Adjust trimmer pot VR107 for a reading of 0 amps on the multimeter Turn the CURRENT control to max fully clockwise Adjust trimmer pot VR106 for a reading of 3 15 amps on the multimeter With the A switch on the power supply engaged adjust VR108 for a reading of 3 15 on the LED display
5. E e 7 DK PRECISION 1635 INSTRUCTION MANUAL DC POWER SUPPLY With LED Display DYNASCAN LE CORPORATION TEST INSTRUMENT SAFETY 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 voltage poses an even greater threat because such voltage can more easily produce a lethal current Your normal work habits should include all accepted prac tices that will prevent contact with exposed high voltage and that will steer current away from your heart in case of accidental contact with a high voltage You will significantly reduce the risk factor if you know and 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 un plugged just turning off the equipment does not remove the hazard or the precautions of step 8 are ob
6. Hook Up procedure in this section Turn on POWER switch The CV indicator should light Press the V switch to select the voltage metering mode Increase the VOLTAGE setting until the LED display reads the desired value The FINE control permits easier setting to a specific value Press the A switch to select the current metering mode and note the load current on the display If the load current exceeds the preset current limit the CV indicator will go off and the CC indicator will light In this case the power supply automatically switches to the constant current mode and further rotation of the VOLTAGE control will not increase the output voltage OPERATING INSTRUCTIONS ee ee ee nn ae Re mm J P OO Um A A mm Se a e mt ro CV indicator on DC POWER SUPPLY 1635 A E E T DC POWER SUPPLY 1635 A MEE E o erre E Bo LS c q on Es EXTERNAL VOLT METER x means N EXTERNAL VOLT METER reyes 9 p Few Preset CURRENT P VOUAGE current limiting See Adjust pete to desired current limit 3 Adjust zwi to desired voltage Temporarily sho Fig 4 Typical Constant Voltage Operation Fig 5 Setting Current Limit 11 OPERATING INSTRUCTIONS ee ere mee en eee aee ee a a a SO a ee De
7. 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 radia tion 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 Many transistors and integrated circuits will not withstand voltage of 30 volts There is no need to worry about voltage spikes or over shoot damaging the equipment under test The voltage be tween 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 pow ered 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 OPERATING INSTRUCTIONS A Grounded common with negative polarity E E quipment Being Powered
8. INSTRUMENT REPAIR SERVICE Because of the specialized skills and test equipment re quired for instrument repair and calibration many customers prefer to rely upon B amp K Precision for this service We maintain a network of B amp K Precision authorized service agencies for this purpose To use this service even if the in strument is no longer under warranty follow the instructions given in the WARRANTY SERVICE INSTRUCTIONS section of this manual There is a nominal charge for instruments out of warranty M M nen eee eee t eee WARRANTY SERVICE INSTRUCTIONS For U S A and its Overseas Territories 1 Refer to the MAINTENANCE section of your B amp K Precision instruction manual for adjustments that may be applicable 2 If the above mentioned does not correct the problem you are experiencing with your unit pack it securely preferably in the original carton or double packed Enclose a letter describing the problem and include your name and address Deliver to or ship PREPAID UPS preferred in U S A to the nearest B amp K Precision authorized service agencv see list enclosed with unit If your list of authorized B amp K Precision service agencies has been misplaced contact your distributor for the name of your nearest service agency or write to B amp K Precision Dynascan Corporation Factory Service Operations 6460 West Cortland Street Chicago Illinoi
9. a ce ea mm e A a mn me pone o teen pe a ee e e e o SETTING CURRENT LIMIT 1 2 Determine the maximum safe current for the device to be powered Temporarily short the and terminals of the power supply together with a test lead Rotate the COARSE VOLTAGE control away from zero sufficiently for the CC indicator to light Press the A switch to select the current metering mode Adjust the CURRENT control for the desired current limit Read the current value on the LED display The current limit overload protection has now been preset Do not change the CURRENT control setting after this step Remove the short between the and terminals and hook up for constant voltage operation TYPICAL CONSTANT CURRENT OPERATION 1 Before connecting the device to be powered to the power supply determine the maximum safe voltage to be applied press the V switch and set the VOLTAGE controls to obtain that voltage reading on the LED display Determine the desired constant current value 12 CC indicator on Adjust to desired current eee 15 CURRENT 1 DC POWER SUPPLY 1635 ILI F EXTERNAL VOLT METER 0 d s VOLTAGE en Preset voltage limit Fig 6 Typical Constant Current Operation 3 Set the CURRENT control to minimum fully counter clockwise 4 Turn off the power supply and connect it to the device to be powered 5 Turn on the powe
10. areful to avoid contacting a nearby metal object that could provide a good ground return path When testing ac powered equipment remember that ac line voltage is usually present on some power input circuits such as the on off switch fuses power transformer etc any time the equipment is connected to an ac outlet even if the equipment is turned off Some equipment with a two wire ac power cord including some with polarized power plugs is the hot chassis type This includes most recent television receivers and audio equipment A plastic or wooden cabinet insulates the chassis to protect the customer When the cabinet is removed for servicing a serious shock hazard exists if the chassis is touched Not only does this present a dangerous shock hazard but damage to test instruments or the equipment under test may result from connecting an earth ground lead of a test instrument to a hot chassis To make measurements in hot chassis equipment always connect an isolation transformer between the ac outlet and the equipment under test The amp K Precision Model TR 110 or 1604 Isolation Transformer or Model 1653 or 1655 AC Power Supply is suitable for most applications To be on the safe side treat all two wire ac powered equipment as hot chassis unless you are sure it has an isolated chassis or an earth ground chassis Never work alone Someone should be nearby to render aid if necessary Training in CPR cardio pulmonary resusci tation fi
11. d jack for external DC voltmeter function Potential at this jack should not sua zm exceed 100 VDC above ground BETO DC POWER SUPPLY 1635 xr M _ C3 picco 18 Fuse 19 Power Cord REAR PANEL CONTROLS 1 E AE Hea ci Ey E VOLTAGE ast 6 1 d Ow 8 Rear panel Fig 1 Front Panel Controls and Indicators Fig 2 Rear Panel a mm q ee ve mp tm 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 30 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 shock 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
12. d you may also have other rights which vary from state to state For your convenience we suggest you contact your B amp K Precision distributor who may be authorized to make repairs or can refer you to the nearest service contractor If warranty service cannot be obtained locally please send the unit to B amp K Precision Service Department 6460 West Cortland Street Chicago Illinois 60635 properly packaged to avoid damage in shipment B amp K Precision Test Instruments warrants products sold only in the U S A and its overseas territories In other countries each distributor warrants the B amp K Precision products which it sells 24 NOTES 25 NOTES 26 TEST INSTRUMENT SAFETY continued from inside front cover 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 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 Use an insulated floor material or a large insulated floor mat to stand on and an insulated work surface on which to place equipment and make certain such surfaces are not damp or wet Use the time proven one hand in the pocket technique while handling an instrument probe Be particularly c
13. e of a power supply BATTERY CHARGING The power supply can be used as a battery charger to re store the charge in rechargeable batteries such as lead acid nickel cadmium and some alkaline types Refer to the bat tery manufacturer s charging specifications for proper vol tage and current settings Charging information is sometimes printed on the batteries Battery charging at least initially requires the constant current mode of operation Before con necting 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 connecting the battery Observe proper polarity and connect as for constant current operation Adjust the CURRENT con trol for the maximum charging current specified by the bat tery manufacturer If the maximum charging current is greater than the power supply s maximum load current set the CURRENT control to maximum The CC indicator will light and the battery will charge at the preset current limit As the battery approaches full charge its terminal voltage wil approach that of the power supply output and the charging current will taper off The power supply may auto matically switch to CV constant voltage operation When this occurs the power supply will continue to provide a trickle charge MAINTENANCE WARNING The following instructions are for use by qualified personnel only To avoid electrica
14. ent from these 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 1635 The equipment being tested may contain its own power supplv and operate from ac power A dc voltage may already be present in the circuit One polarity of the power supply output is floated to an appropriate point in the circuit such as the emitter of a transistor The other polarity of the power supply output is then applied to another point in the circuit such as the base of that transistor Varying the power supply voltage then varies the dc bias on the stage and the effects may be noted A series limiting resistor is often used to protect the circuits from overdissipation ELECTRONICS MANUFACTURING In electronics manufacturing facilities the power supply is often used as a dc power source while testing and adjusting modules subassemblies and complete units in the production and assembly area or in the qualitv control area The instru ment can be used in incoming inspection as a dc power source for testing purchased components and subassemblies APPLIC ATIONS ee ee ae This power supply is particularly well suited for manufac turing applications because of its ease of operation and its continuous duty rating When load current or total power dis
15. ernal Volts 0 to 199 9 V 0 5 2 digits 0 to 19 99 0 5 2 digits 110 120 220 240 VAC 110 50 60 Hz Approximately 175 W or less at full load Reverse polarity protection Current limiting SPECIFIC ATIONS cr M ae a e ec TEMPERATURE RANGE WEIGHT Operation 0 to 40 Storage 15 to 70 ACCESSORIES SUPPLIED DIMENSIONS HxWxD 172 119 x 305 mm 6 75 x 4 69 x 12 11 1 4 lb Hook Up Leads 1 red 1 black Spare Fuse Schematic Diagram amp Parts List CONTROLS AND INDICATORS q n INDICATORS Either the CC or CV and the V or A 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 Constant Current Indicator Red LED lights in constant current mode Unit regulates output current at value set by CURRENT controls 2 Constant Voltage Indicator Green LED lights in constant voltage mode Unit regulates output voltage at value set by VOLTAGE controls 3 LED Display 3 1 2 digit display indicates internal vol tage internal current or dc voltage applied to EXTER NAL VOLT METER jacks depending on which meter selection switch is engaged External DC voltage up to 199 9 volts can be read on the display 4 V Volt Meter Indicator Green LED lights when the inter
16. h power supply exercise control over a 0 30 volt range Add the LED display readings together or connect the external voltmeter jacks V and COM across the load to determine the total output voltage Load current may be monitored from either supply the readings will be identical since they are connected in series Also since the supplies are connected in series it is only necessary to set the current limit on one of the supplies the other may be set for maximum CONNECTING TWO POWER SUPPLIES IN PARALLEL Two power supplies may be connected in parallel to double the maximum load current In this configuration the 14 two supplies will provide two 0 30 volt output at up to 6 amps heavier gauge hook up leads are advisable Current equalizing resistors must be used as shown in Fig 9 However the protective current limiting feature will prevent damage if current is temporarily unbalanced during set up When connected in parallel and operating in the constant voltage mode determine the total load current limit and preset the current limiting for each power supply to half the total load current value 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 current meter readings together for total load current or connect an external ammeter in series with the load If the current equalizing re
17. l shock do not per form any servicing other than contained in the operating instructions unless you are qualified to do so FUSE REPLACEMENT If the fuse blows the CV CC V or A indicators will not light and the power supply will not operate 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 For 110 or 220 V operation a 3 A 250 V fuse should be used and for 220 or 240 V operation a 1 5 A 250 V fuse should be used The fuse is located on the rear panel see Fig 2 LINE VOLTAGE CONVERSION The primary winding of the power transformer is tapped to permit operation from 110 120 220 or 240 VAC 50 60 Hz line voltage Conversion from one line voltage to another is done by a simple wiring change as shown in Fig 10 A label on the rear panel identifies the line voltage to which the unit was factory wired To convert to a different line voltage perform the following procedure 19 1 sure the power cord is unplugged 2 Remove the case and locate the power transformer 3 Rewire the power transformer to the desired line volt age as shown in Fig 10 Insulate the ends of the unused transformer tap wires 4 A change in line voltage may also require a correspond ing change of fuse value Install the correct fuse value as listed in the FUSE REPLACEMENT section 5 Replace the cover
18. nal or external voltage metering mode is selected A Current Meter Indicator Green LED lights when current metering A mode is selected m VOLTAGE CONTROLS 6 COARSE Control Coarse adjustment of output voltage Read value on LED display when volt meter V function is selected 7 FINE Control Fine adjustment of output voltage Read value on LED display when volt meter V function is selected CURRENT CONTROL 8 CURRENT Control Adjusts current limit in constant voltage mode Adjusts constant current value in constant current mode Current can be read from LED display when current meter A function is selected POWER CONTROLS 9 ON OFF Switch OUTPUT TERMINALS 10 Terminal Red Positive polarity output terminal 11 GND Terminal Green Earth and chassis ground 12 Terminal Black Negative polarity output terminal METERING SELECTION SWITCHES 13 Pushbutton When this switch is engaged the LED Display indicates output current 14 V Pushbutton When this switch is engaged the LED Display indicates the output voltage 15 EXTERNAL VOLT METER Pushbutton When this switch is engaged the LED Display indicates the dc voltage applied to the EXTERNAL VOLT METER Jacks CONTROLS AND INDICATORS ee re er ee een ee ne eee ee eR D M Ao HERE o GO e me mm SEER mp 16 V Jack Positive input jack for external DC voltmeter function Maximum input is 200 VDC 17 COM Jack Common groun
19. on 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 Constant Current Range Crossover Point Output Voltage Constant Voltage Range Output Current Fig 7 Constant Voltage Constant Current Characteristic Similarly crossover from the constant current to the constant voltage mode automatically occurs from a decrease OPERATING INSTRUCTIONS eee a eee ee e e e EE e a a e e e mm a 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 8 volts A low battery will place a heavy load on the supply and it will operate in the constant current mode which may be adjusted for a 1 amp charging rate As the battery becomes charged and its voltage approaches 13 8 volts its load decreases to the point where it no longer demands the full 1 amp charging rate This is the crossover point where the power supply goes into the constant voltage mode CONNECTING TWO POWER SUPPLIES IN SERIES Two Model 1635 power supplies may be connected in series to provide a variable 0 60 volt output In this con figuration the power supply can supply up to 3 amps See Fig 8 for the connection scheme When connected in series the VOLTAGE controls of eac
20. pping the red terminal to the green GND terminal as shown in Fig 3B c If an earth ground reference is not required the configuration of Fig 3 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 is separate from both the positive and negative polarity power inputs use the connection shown in Fig 3D Observe proper polarity If the circuit being powered is not equipped with reverse polarity protection damage to the circuit can result from reverse polarity Use color coded hook up leads such as the set supplied with the power supply for convenience in identifying polar ity red for and black for Make sure that the hook up leads offer sufficient cur rent capability and low resistance between the power supply and the circuits being powered The hook up leads supplied with the power supply are rated for 3 amps 10 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 Set FINE VOLTAGE control to center and COARSE VOLTAGE control to minimum fully counterclockwise Turn off power supply and connect it to the device to be powered see
21. r supply The CC indicator should light 6 Press the A switch 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 connecting the load as prescribed in the earlier Setting Current Limit procedure 8 If the load current drops below the constant current value the CC indicator will go off and the CV indicator will light In this case the power supply automatically switches to the constant voltage mode and further rotation of the CURRENT control will not increase the output current CONSTANT VOLTAGE CONSTANT CURRENT CHARACTERISTIC The working characteristic of this power supply is called a constant voltage constant current automatic crossover type This permits continuous transition from constant cur rent to constant voltage modes in response to the load change The intersection of constant voltage and constant current modes is called the crossover point Fig 7 shows the relationship between this crossover point and the load OPERATING INSTRUCTIONS For example if the load is such that the power supply is operating in the constant voltage mode a regulated output voltage is provided The output voltage remains constant as the load increases up until the point where the preset current limit is reached At that point the output current becomes constant and the output voltage drops in proporti
22. rst aid is highly recommended D DYNASCAN NUL CORPORATION 6460 West Cortland Street Chicago Illinois 60635 1986 DYNASCAN CORP 480 535 9 001 Printed in U S A
23. rt re am e an ae em mm mm Output current equals sum of both displays Current metering mode Use load equalizing resistors e e e Dm em e e e a a a tq e e pe a q q a a q APPLICATIONS GENERAL The Model 1635 power supply has a very wide variety of applications in electrical and electronics servicing engi neering laboratories manufacturing and testing facilities schools and home hobbying The power supply output is fullv adjustable from 0 to 30 volts and 0 to 3 amps This flexibility makes them suitable for most applications requiring a dc power source ELECTRONICS SERVICING Most electronics troubleshooting and repair is performed on a test bench This power supply can provide the dc power source to operate a module or circuit board on the test bench when it is removed from its parent equipment It can be used to power portable battery operated equipment and check the effect of low battery voltage It can power vehicular equip ment such as tape players auto sound systems CB radios etc on the test bench Most automobiles and other vechicles use 12 volt electri cal systems Although the electrical system is normally referred to as a 12 volt system actual battery voltage when fully charged is approximately 14 volts The power supply may be set to 14 volts for servicing equipment from vehicles 1 with 12 volt electrical systems Some trucks use a 24 volt electrical system bench testing of equipm
24. s 60635 Tel 312 889 8870 Telex 25 3475 Also use this address for technical inquiries and replacement parts orders 23 LIMITED ONE YEAR WARRANTY DYNASCAN CORPORATION warrants to the original purchaser that its B amp K Precision product and the component parts thereof will be free from defects in workmanship and materials for a period of one year from the date of purchase DYNASCAN will without charge repair or replace at its option defective product or component parts upon delivery to an authorized B amp K Precision service contractor or the factory service department accompanied by proof of the purchase date in the form of a sales receipt To obtain warranty coverage in the U S A this product must be registered by completing and mailing the enclosed warranty registration card to DYNASCAN B amp K Precision 6460 West Cortland Street Chicago Illinois 60635 within fifteen 15 days from the date 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 It is void if the serial number is altered defaced or removed DYNASCAN shall not be liable for any consequential damages including without limitation damages resulting from loss of use Some states do not allow limitation of incidental or consequential damages so the above limitation or exclusion may not apply to you This warranty gives you specific rights an
25. served 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 500 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 discharge 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 continued on inside back cover Instruction Manual for Model 1635 DC POWER SUPPLY With LED Display D DYNASCAN PNG AA CORPORATION 6460 West Cortland Street Chicago Illinois 60635 TABLE OF CONTENTS Page TEST INSTRUMENT SAFETY inside front cover acao ol SPECIFICATIONS ed a CONTROLS AND INDICATORS 99 9999999 nnn SD OPERATING 5 Safety Precautions oooooooooomoroonamooomononrososo Equipment
26. sipation are among the main characteristics to be meas ured the total load current and voltage are easily displayed on the LED display The current limit can be set so that all units which do not meet the load current specification will cause the CC indicator to light and the unit can be rejected ELECTRONICS DESIGN LAB The technician or engineer working in an engineering lab oratory requires a dc power supply to power breadboard and prototype circuits This power supply is ideal because it mon itors output current output voltage or an external DC voltage limits current to protect the circuit is adjustable over a wide range and has excellent regulation and very low ripple Use of the instrument in an engineering laboratory is very similar to that described for servicing electronics equipment and modules except that lower currents may be prevalent when powering individual circuits The current limiting feature is very valuable in this application because it can pro tect unproven circuits from damage ELECTRONICS EDUCATION The student in an electronics curriculum may use the power supply for powering equipment and circuits as previ 18 ously described for all other applications In addition the power supply can be used in the classroom laboratory to con duct experiments in fundamental electronics In learning Ohm s law for example the relationships of resistance cur rent and voltage are easily demonstrated by the us
27. sistors are not well matched it is preferable that the voltages be slightly unbalanced to achieve current balance Be sure that the supplies are ade quately balanced so that both remain in the CV mode When connected in parallel and operating in the constant current mode the VOLTAGE controls of both supplies should be preset to the same value Then when the load is connect ed the CURRENT controls of the two supplies should be adjusted for approximately equal current from each unit Be sure that both supplies remain in the CC mode USING THE EXTERNAL VOLTMETER FUNCTION 1 Press the EXTERNAL VOLT METER switch 2 Connect the positive side of the voltage to be measured to the red V jack and the negative side to the black COM jack and read the voltage on the LED display OPERATING INSTRUCTIONS mete en ae crer me vem md a ee er me a AS eh nc e e a a 2 e 2 e e o a mt ee vee oe Output voltage equals sum of both displays in voltage metering mode gt DC POWER SUPPLY 1635 30 0 3800 so dE 2 EXTERNAL VOLT METER Fig 8 Connecting Two Power Supplies in Series 15 OPERATING INSTRUCTIONS es dH GU EXTERNAL VOLT METER JOD eave VOLTAGE VOLTAGE DC POWER SUPPLY 1635 lingen 5 5 DC POWER SUPPLY 1635 Fig 9 Connecting Two Power Supplies in Parallel 16 nen i at DDT e A a a qi OT A m m A a ear Ce
28. splay to monitors either the output current output voltage or a voltage up to 199 9 volts applied to the external metering inputs LED s indicate voltage or current metering The Model 1635 exhibits 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 func tional The mechanical configuration conserves bench space and allows for easy portability This instrument 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 cur rent 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 outpu
29. t is isolated from chassis and earth ground which permits full flexibility of connections When needed the 4 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 0 10 60 volt power source or two supplies may be connected in parallel with suitable balancing resistors for up to twice the output current This power supply is well suited for a wide variety of electrical and electronics applications including service shops engineering labs production testing school laborator ies and home use by hobbyists 0 30 VOLTS Continuously variable over 0 to 30 volt range with coarse and fine controls 0 3 AMPS O to 3 amp current rated for continuous duty at full output current LABORATORY QUALITY Excellent regulation low ripple CONSTANT VOLTAGE OR CONSTANT CURRENT Provides regulated dc voltage output or regulated dc cur rent output Crossover is smooth and automatic LED DISPLAY A large easy to read LED 3 1 2 digit display monitors output voltage output current or an external voltage and provides good visiblilty in bright or low light Meter allows resolution of 0 1 volt or 0 1 amp EXTERNAL VOLTMETER FUNCTION Front panel input jacks allow built in meter to be used to measure external DC voltages of up 199 9 volts aeae LED INDICATORS Act as pilot light and identify mode of opera
30. tion 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 Configuration conserves bench space and aids portability Logical convenient layout of controls HOOK UP CABLES Supplied with red and black hook up leads OUTPUT VOLTAGE OUTPUT CURRENT SPECIFICATIONS 0 to 30 VDC coarse and fine adjustment 0 to 3 A CONSTANT VOLTAGE OPERATION Voltage Regulation Line 110 130 V Load no load to full load Recovery Time Ripple Voltage Peak to Peak RMS Temperature Coefficient 0 to 35 C lt 0 02 2 mV lt 0 02 3 mV lt 200 15 typical lt 2 mV 1 mV 5 mV typical CONSTANT CURRENT OPERATION Adjustable Current Limits Current Regulation Line 110 130 V Load 5 to 100 0 15 A to 3 A lt 5 mA typ 9 mA max lt 5 mA typ 9mA max Current Ripple METERING Type Functions Voltmeter Range Accuracy Ammeter Range Accuracy POWER REQUIREMENTS POWER CONSUMPTION PROTECTION lt 3 mA typical 3 1 2 digit LED Display 0 5 high Volts Amps Ext
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