B&K Precision 1737 Dual Range DC Power Supply
Contents
1. s cover Remove the calibration jumper Reassemble the power supply Connect the power cord When turned on the power supply will have the same parameters programmed and saved before the calibration procedure Instrument Repair Service Because of the specialized skills and test equipment required 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 instrument 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 26 7 Error Messages The following types of errors may occur e Self test errors e Calibration errors e Command errors The first two types of errors are displayed on the voltage display as Er xx where xx is a number The command errors are sent through the RS232 interface 7 1 Self Test Errors Er 01 EEPROM does not respond Er 02 CV not high Er 03 CV not low Er 04 CC not high Er 05 CC not low Er 06 ADC does not respond Er 07 ADC not ready Er 08 No reference voltage Er 09 ADC conversion error Er 10 ADC AVdd lt 3 0V Er 11 ADC AVdd 3 6V Er 12 Calibration constants checksum failed 7 2 Calibration Errors Zero voltage calibration errors Er 20 CC not high Er 21 CV not low Er 22 DAC2. 0 2 3 mA Line Regulation of output offset Voltage 0 01 3 mV Current 0 2 3 mA Ripple amp Noise 20 Hz 20 MHz Voltage 1 mVrms Current lt 3 mArms Recovery Time lt 100 us Meter Resolution Voltage 10 mV Current 1 mA Metering Accuracy Voltage 0 5 9 digits Current 0 5 9 digits General Power Requirements 120 220 VAC 10 50 60 Hz Power Consumption lt 180 W Protection Reverse polarity current limiting Operating Environment Temperature 32 F to 104 F 0 C to 40 C Humidity 75 R H T t fficient 0 C 35 C emperature coefficient 300 ppm C of output offset Storage Temperature 5 F to 158 F 15 to 70 C 29 Storage Humidity 85 R H Mechanical Specifications Weight 10 5 Ibs 4 8 kg 5 5 x 6 2 x 12 5 Dimensions W x H x D 140 x 158 x 318 mm Power cord instruction manual supplied Accessories RS 232 cable shorting bar NOTE All specifications apply to the unit after a temperature stabilization time of 30 minutes Specifications and information are subject to change without notice To ensure the most current version of this manual please download the current version here http www bkprecision com search manual 1737 For current up to date product information please visit www bkprecision com 30 9 Service Information Wa
3. Linda CA 92887 www bkprecision com 2011 B amp K Precision Corp Printed in Taiwan v063011
4. low battery will have a low 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 increases 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 Constant Current Range voltage mode Vo MAX lo MAX Crossover Point Output Constant Voltage Voltage Range Output Current Figure 7 Constant Voltage Constant Current Characteristic 14 4 6 Saving the Power Supply s Current State The current state of the power supply is saved after 2 seconds from the last adjustment or after the SAVE command is received through the RS232 interface 4 7 Connecting Two Power Supplies in Series Two power supplies may be connected in series to provide a variable 0 120 V output In this configuration the two power supplies can supply up to 60 V 3 A or 120 V 2 A See Figure 8 for the connection scheme When connected in series the voltage controls of each power supply exercise control over a 0 60 V range Add the LED display readings together or connect an external voltmeter 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 n
5. 1 10 Limited Two Year Warranty B amp 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 amp 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 To obtain warranty coverage in the U S A this product must be registered by completing a warranty registration form on our website at www bkprecision 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 amp K Precision Corp shall not be liable for any consequential damages including without limitation damages resulting from loss of use Some states do not allow limitations of incidental or consequential damages So the above limitation or exclusion may not apply to you This warranty gives you specific rights and you may have other rights which vary from state to state B amp K Precision Corp 22820 Savi Ranch Parkway Yorba Linda CA 92887 www bkprecision com 714 921 9095 32 Page intentionally left blank 33 BK PRECISION 22820 Savi Ranch Parkway Yorba
6. BK EFES PILwiISR TY MEER 1737 Dual Range DC Power Supply INSTRUCTION MANUAL VOLTAGE 1 Safety Summary The following safety precautions apply to both operating and maintenance personnel and must be observed during all phases of operation service and repair of this instrument Before applying power follow the installation instructions and become familiar with the operating instructions for this instrument GROUND THE INSTRUMENT To minimize shock hazard the instrument chassis and cabinet must be connected to an electrical ground This instrument is grounded through the ground conductor of the supplied three conductor ac power cable The power cable must be plugged into an approved three conductor electrical outlet Do not alter the ground connection Without the protective ground connection all accessible conductive parts including control knobs can render an electric shock The power jack and mating plug of the power cable meet IEC safety standards DO NOT OPERATE IN AN EXPLOSIVE ATMOSPHERE Do not operate the instrument in the presence of flammable gases or fumes Operation of any electrical instrument in such an environment constitutes a definite safety hazard KEEP AWAY FROM LIVE CIRCUITS Instrument covers must not be removed by operating personnel Component replacement and internal adjustments must be made by qualified maintenance personnel Disconnect the power cord before removing the instrument covers and re
7. I F for full current calibration and turn the voltage coarse knob When you initiate the full current calibration the CV LED lights up and the power supply will display Voltage display 1 F Current display ConA Connect a digital ammeter BK Precision 5491B or similar instrument to the output terminals of the power supply to initiate the full current calibration procedure If a digital ammeter is not connected within 30 seconds the power supply will abandon the current calibration procedure and will return to the Calibration menu The CV LED indicator will turn off and the CC LED indicator will light on The power supply will then display Voltage display F Current display hex number 25 c d A hexadecimal number between 0 and FFFFh is shown on the current display Use the current coarse and fine knobs to adjust the value displayed by the power supply until the ammeter indicates the value to 3 0801 A Turn the voltage coarse knob to finish the calibration While performing the full current calibration the current display will show Adc After the full current calibration the message Done is shown on the current display for 1 sec The power supply does not return to the Calibration menu because the calibration procedure is finished and the power supply must be turned off Leaving the calibration menu a b c d e f After turning off the power supply disconnect the power cord Remove power supply
8. Read output current on meter Preset voltage limit Adjust to VOLTAGE desired my current E CC Indicator on CURRENT Figure 6 Typical Constant Current Operation 13 4 5 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 current to constant voltage modes in response to the load change The intersection of constant voltage and constant current modes is called the crossover point Figure 7 shows the relationship between this crossover point and the load 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 decreases 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 proportion to further decreases 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 from an increase 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
9. acle underneath the line cord 6 2 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 multimeter with an accuracy of 0 02 DCV or better is available B amp K Precision Model 5491B or equivalent 20 6 3 Calibration Calibration is a procedure that ensures that the power supply will work properly with parameters specified within the Specifications section Before initiating the calibration procedure the following conditions must be assured e Disconnect any loads connected to the power supply and turn it on e Let the power supply be turned on for 1 hour with no loads connected before you start the calibration procedure e Calibration ambient temperature must be 25 C e Ambient relative humidity must be less than 80 To calibrate the power supply complete the following steps 1 Turn on the power supply in calibrating mode Zero voltage calibration Full voltage calibration Zero current calibration Full current calibration Leaving the Calibration menu Oe RS pa po pC ay o o EE rv LW JE Og PR oar ie Figure 11 Location of Adjustments hd tJ ep 21 1 Turn onthe power supply in calibrating mode a Turn off the power supply Disconne
10. ards To avoid electrical shock hazard disconnect power cord before removing covers Refer servicing to qualified personnel Before connecting the line cord to the AC mains check the rear panel AC line voltage indicator Applying a line voltage other than the indicated voltage can destroy the AC line fuses For continued fire protection replace fuses only with those of the specified voltage and current ratings This product uses components which can be damaged by electro static discharge ESD To avoid damage be sure to follow proper procedures for handling storing and transporting parts and subassemblies which contain ESD sensitive components SAFETY SYMBOLS AN Certification Connect to safety earth ground using the wire recommended in the user manual This symbol on an instrument indicates that the user should refer to the operating instructions located in the manual We certify that this product met its published specifications at time of shipment from the factory Compliance Statements Disposal of Old Electrical amp Electronic Equipment Applicable in the European Union and other European countries with separate collection systems This product is subject to Directive 2002 96 EC of the European Parliament and the Council of the European Union on waste electrical and electronic equipment WEEE and in jurisdictions adopting that Directive is marked as being put on the market after August 13 2005 an
11. ct the power cord and all loads connected to the power supply b Remove power supply s cover c Set the calibration jumper as shown in Figure 11 d Reassemble the power supply e Connect the power cord to the power supply f Turn on the power supply in Calibration menu The power supply will display Voltage display CAL Current display U 0 You can browse the calibration menu by turning the current coarse knob Using the voltage coarse knob you can select one of the following calibration procedures U 0 Zero voltage calibration U F Full voltage calibration O Zero current calibration F Full current calibration The voltage fine and current fine knobs are not used Important note In order to perform a correct calibration procedure you must select the full voltage calibration option just after the zero voltage calibration option and the full current calibration option just after the zero current calibration option 22 2 Zero voltage calibration a Turn the current coarse knob to select U 0 for zero voltage calibration and turn the voltage coarse knob The power supply will display Voltage display U 0 Current display hex number On the current display a hexadecimal number between 0 and FFFFh is displayed During the zero voltage calibration the CV LED is lit b Connect a digital voltmeter to the output terminals of the power supply B amp K Precision 5491B or similar instrument c Use the cur
12. d should not be disposed of as aa unsorted municipal waste Please utilize your local WEEE collection facilities in the disposition of this product and otherwise observe all applicable requirements Contents 1 2 3 8 9 Safety Summary iss osse ed see ed ae GEE Ned Es ee 1 Introduction sees ee ee EE RE AE 5 Quick Reference sed ie Si de de id ed ae ie ie 3 1 Front Panel see se ee ee ee ee ee RA ee ee ee ee 6 3 2 LLE ER EE EE EE Eaa 7 Operating Instructions sesse essens ede ves veer Nege ineen S 4 1 Instrument HOOK Up eissien ee ee EA Re ee ee ee ee ee ee 9 4 2 Typical Constant Voltage Operation ee Re Re 11 4 3 Setting Current Limit EE Ee 12 4 4 Typical Constant Current Operation ccccscccsssseecesssseeeesssseeesees 13 4 5 Constant Voltage Constant Current Characteristic cccc0 14 4 6 Saving the Power Supply s Current State sesse ee Re ee 15 4 7 Connecting Two Power Supplies in Series esse Re 15 4 8 Connecting Two Power Supplies in Parallel iese ee 16 Remote DPeratiOR sis Re ie Ee Sk n ges wes L7 5 1 RS232 Configuration Overview cccssscccsssscccsssseseesssseeeessseeeesees 18 5 2 RS232 COMMAMNAS asse ER vesscssasecdsascedbicasatarsigeeepsesayatesteserasesasers 18 5 3 Application Software ccccssccccsssseccesssseecesseeeesssseecesseeeessseeeesees 19 Maintenance issie see RES Ee Ne Ge sen sed 6 1 Fuse Replacement sessies ee RA RA ee ee ee ee ee ee ee 20 6 2 AdjUS
13. ecessary to set the current limit on one of the supplies the other may be set for maximum Output voltage equals sum of both diplays In voltage metering mode output current equals value on either ammeter VOLTAGE both read identical CURRENT Figure 8 Connecting Two Power Supplies in Series 15 4 8 Connecting Two Power Supplies in Parallel Two power supplies may be connected in parallel to double the maximum load current In this configuration the two power supplies will provide 0 60 V output at up to 4A or 0 30 V at 6 A heavier gauge hook up leads are advisable Current equalizing resistors must be used as shown in Figure 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 Adjust both power supplies to same voltage Output current VOLTAGE equals sum of both displays CURRENT MOOOO 4 Use load equalizing resisters Fi
14. ent limit value see Setting Current Limit procedure in this section 2 The output voltage can be set using the voltage coarse knob with a 1 V resolution and voltage fine knob with a 10 mV resolution After the last adjustment you must wait 3 seconds until the state is saved 3 Turn off power supply and connect it to the device to be powered see Instrument Hook Up procedure in this section 4 Turn on the power switch The CV indicator should light 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 7 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 Read output voltage and current meters Adjust to desired voltage BK FREGIO orem emv au VOLTAGE N e CV indicator on CURRENT Preset current a HEB limiting mP Figure 4 Typical Constant Voltage Operation 11 4 3 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 Adjust the coarse and fine current control for the desired current limit Read the curre
15. ffective 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 the voltage rating of the circuit being powered Many transistors and integrated circuits will not withstand voltage of 60 volts There is no need to worry about voltage spikes or overshoot damaging the equipment under test The voltage between the output terminals of the power supply never exceeds the preset value as the POWER switch is turned on or off 4 1 Instrument 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 powered 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 Figure 3 illustrates the grounding possibilities a If the negative polarity of the equipment or circuit being powered is also the chassis or common it may be grounded to earth by strapping the black terminal to the green 4 terminal as shown in Figure 3A b Similarly the positive polarity can be grounded by strapping the red terminal to the green 4 terminal as shown in Figure 3B c If an earth ground reference is not required the configuration of Figure 3C may be used T
16. gure 9 Connecting Two Power Supplies in Parallel 16 If the current equalizing resistors are not well matched it is preferable that the voltages be slightly unbalanced to achieve current balance Be sure that the supplies are adequately 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 connected 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 5 Remote Operation The power supply can be connected to the RS232 interface using the 9 pin DB 9 serial connector on the rear panel The 1737 uses a null modem RS232 cable The cable pin diagram for the DB 9 connector is shown in the picture below Instrument PC GND 5 COS GND DB 9 DB 9 connector connector Figure 10 RS232 Cable Pin Diagram For all communications over the RS232 interface the power supply uses Xon Xoff protocol NOTE If using HyperTerminal make sure you properly configure the ASCII Setup In ASCII Setup do not append line feeds to ASCII Sending Echo typed characters locally can be checked but Send line ends with line feeds should be left unchecked In ASCII Receiving Append line feeds to incoming line ends can also be checked 17 5 1 RS232 Config
17. he scheme in Figure 3C should also be used where it is not known whether the chassis is common with either the positive or negative polarity d lIf 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 Figure 3D 6 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 for convenience in identifying polarity red for and black for 7 Make sure that the hook up leads offer sufficient current capability and low resistance between the power supply and the circuits being powered i EE A O o VOLTAGE VOLTAGE DO CURRENT N Eauipment Being Powered Equipment Being Powered A Grounded common with B Grounded common with negative polarity positive polarity Figure 3 A and B Grounding Possibilities i EE 3 O VOLTAGE VOLTAGE CURRENT CURRENT 85 0 Equipment Being Powered Equipment Being Powered negative or positive polarity c No ground reference D Grounded not common with Figure 3 C and D Grounding Possibilities 10 4 2 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 curr
18. nt value on the current LED display 4 The current limit overload protection has now been preset Do not change the current controls settings after this step 5 Remove the short between the and terminals and hook up for constant voltage operation Read current limit value from meter Adjust to desired current limit VOLTAGE Temporarily short to Figure 5 Setting Current Limit 12 4 4 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 Determine the desired constant current value Set the coarse and fine current control to minimum 1 mA Wait 3 seconds Turn off the power supply and connect it to the device to be powered Turn on the power supply The CC indicator should light DUUR N Increase the coarse and fine 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 described earlier in the Setting Current Limit procedure 7 Ifthe 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 controls will not increase the output current
19. out of range Er 23 ADC out of range Er 24 ADC system calibration failed Er 25 DAC zero voltage constant checksum failed Er 26 ADC zero voltage constant checksum failed 27 Full voltage calibration errors Er 30 CC not high Er 31 CV not low Er 32 DAC out of range Er 33 ADC out of range Er 34 ADC system calibration failed Er 35 DAC full voltage constant checksum failed Er 36 ADC full voltage constant checksum failed Zero current calibration errors Er 40 CC not low Er 41 CV not high Er 42 DAC out of range Er 43 ADC out of range Er 44 ADC system calibration failed Er 45 DAC zero current constant checksum failed Er 46 ADC zero current constant checksum failed Full current calibration errors Er 50 CC not low Er 51 CV not high Er 52 DAC out of range Er 53 ADC out of range Er 54 ADC system calibration failed Er 55 DAC full current constant checksum failed Er 56 ADC full current constant checksum failed 7 3 Command Errors Communication Error lt CR gt RS232 framing parity or overrun error Syntax Error lt CR gt invalid syntax was found in the command string Out of range lt CR gt a numeric parameter value is outside the valid range for the command 28 8 Specifications 1737 Output Ratings 0 C 40 C Voltage 0 60 V 0 3 A 0 30 V Current Load Regulation of output offset 0 2 A 30 60 V Voltage 0 01 3 mV Current
20. placing components Under certain conditions even with the power cable removed dangerous voltages may exist To avoid injuries always disconnect power and discharge circuits before touching them DO NOT SERVICE OR ADJUST ALONE Do not attempt any internal service or adjustment unless another person capable of rendering first aid and resuscitation is present DO NOT SUBSTITUTE PARTS OR MODIFY THE INSTRUMENT Do not install substitute parts or perform any unauthorized modifications to this instrument Return the instrument to B amp K Precision for service and repair to ensure that safety features are maintained WARNINGS AND CAUTIONS WARNING and CAUTION statements such as the following examples denote a hazard and appear throughout this manual Follow all instructions contained in these statements A WARNING statement calls attention to an operating procedure practice or condition which if not followed correctly could result in injury or death to personnel A CAUTION statement calls attention to an operating procedure practice or condition which if not followed correctly could result in damage to or destruction of parts or the entire product WARNING WARNING CAUTION CAUTION Do not alter the ground connection Without the protective ground connection all accessible conductive parts including control knobs can render an electric shock The power jack and mating plug of the power cable meet IEC safety stand
21. pply is in Constant Voltage mode CC lt CR gt if the power supply is in Constant Current mode 5 3 Application Software Remotely control your 1737 using B amp K Precision s application software available for download at www bkprecision com This software provides a virtual front panel and a simple data logging function to store and log data to a text or CSV file RS232 commands can also be sent through the software 19 6 Maintenance WARNING The following instructions are for use by qualified personnel only To avoid electrical shock do not perform any servicing other than contained in the operating instructions unless you are qualified to do so 6 1 Fuse Replacement If the fuse blows the CV or CC 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 as listed below The fuse is located on the rear panel see Figure 2 Line Voltage Fuse Type 120 Vac 10 50 60 Hz 2 5A Slow Blow 220 Vac 10 50 60 Hz 1 25A Slow Blow Table 2 Fuse Values Line Voltage Conversion International Units The primary winding of the power transformer is tapped to permit operation from 120 220 230 or 240 VAC 50 60 Hz line voltage Conversion from one line voltage to another is done by a simple position change of the fuse recept
22. rent coarse and fine knobs to adjust the value displayed by the power supply until the voltmeter indicates the closest value to 0 V d Turn the voltage coarse knob to finish the calibration While performing the zero voltage calibration the current display will show Adc After the zero voltage calibration the message Done is shown on the current display for 1 sec Then the power supply returns to the Calibration menu 3 Full voltage calibration To finish the voltage calibration procedure the full voltage calibration must be done after the zero voltage calibration a Select UF for full voltage calibration and turn the voltage coarse knob The power supply will display Voltage display U F Current display hex number 23 b c d A hexadecimal number between 0 and FFFFh will be shown on the current display During the zero voltage calibration the CV LED is lit Connect a digital voltmeter to the output terminals of the power supply B amp K Precision 5491B or similar instrument Use the current coarse and fine knobs to adjust the value displayed by the power supply until the voltmeter indicates the value to 60 882 V Turn the voltage coarse knob to finish the calibration While performing the full voltage calibration the current display will show Adc After the full voltage calibration the message Done is shown on the current display for 1 sec Then the power supply returns to the Calibration menu 4 Ze
23. ro current calibration a b Select 0 for zero current calibration and turn the voltage coarse knob When you initiate the zero current calibration the CV LED lights up and the power supply will display Voltage display 0 Current display ConA Connect a digital ammeter B amp K Precision 5491B or similar instrument to the output terminals of the power supply to initiate the zero current calibration procedure If a digital ammeter is not connected within 30 seconds the power supply will abandon the current calibration procedure and return to the Calibration menu The CV LED indicator will go off and the CC LED indicator will light on The power supply will then display Voltage display 0 Current display hex number 24 d A hexadecimal number between 0 and FFFFh is shown on the current display Use the current coarse and fine knobs to adjust the value displayed by the power supply until the ammeter indicates the closest value to 0 A Turn the voltage coarse knob to finish the calibration While performing the zero current calibration the current display will show Adc After the zero current calibration the message Done is shown on the current display for 1 sec Then the power supply returns to the Calibration menu 5 Full current calibration To finish the current calibration procedure you must select the full current calibration option after the zero current calibration a b Select
24. rranty Service Please go to the support and service section on our website at www bkprecision com to obtain an RMA Return the product in the original packaging with proof of purchase to the address below Clearly state on the RMA the performance problem and return any leads probes connectors and accessories that you are using with the device Non Warranty Service Please go to the support and service section on our website at www bkprecision com to obtain an RMA Return the product in the original packaging to the address below Clearly state on the RMA the performance problem and return any leads probes connectors and accessories that you are using with the device Customers not on an open account must include payment in the form of a money order or credit card For the most current repair charges please refer to the service and support section on our website Return all merchandise to B amp 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 America is included for Warranty Service For overnight shipments and non North American shipping fees please contact B amp K Precision Corp B amp K Precision Corp 22820 Savi Ranch Parkway Yorba Linda CA 92887 www bkprecision com 714 921 9095 Include with the returned instrument your complete return shipping address contact name phone number and description of problem 3
25. t regulation e Constant voltage CV and constant current CC operation e Two 4 digit LED displays provide good visibility in bright or low light e LED indication for CV and CC modes e Automatic recall of last settings on power up e RS 232 interface e Isolated output e Overload protection e Reverse polarity protection 3 Quick Reference 3 1 Front Panel se 1737 DUAL RANGE dis oc powen surruy ET oa Me O24 meee FINE VOLTAGE B COARSE CURRENT Figure 1 Front Panel INDICATORS Either the CV or CC LED indicators will be lit whenever the unit is operating The unit automatically changes from CV to CC operation when the preset current limit is reached 1 CV Constant Voltage Indicator The green LED is lit in constant voltage mode Unit regulates output voltage at the value set by voltage controls 2 CC Constant Current Indicator The red LED is lit in constant current mode Unit regulates output current at the value set by current controls 3 Green LED Display 4 digit display continuously monitors voltage 4 Red LED Display 4 digit display continuously monitors current VOLTAGE CONTROLS 5 Voltage Coarse Control Coarse adjustment of output voltage Read value on the green LED display 6 Voltage Fine Control Fine adjustment of output voltage Read value on the green LED display CURRENT CONTROL 7 Current Coarse Control Coarse adjustment of current limit Read value on the red LED displa
26. tOB ES sei GE De ee ee ee De Ee ER N De Ge bee ee 20 6 3 6de EE EE N EE N 21 6 4 Instrument Repair Service es 26 Error ELE HE IE EO EE 27 7 1 Add HO EE EE OE 27 7 2 Calibration ETOS sees see esse ee ese ee ee ee ee ee AA ee ee ee ee 27 7 3 Comimand Er Ot Siriene se ee eke Ne se ee aaia 28 Specifications ii Ee N eN oe ee ed Ne ges 29 Service Information sasie ssess sins sa NEE s de EK ke Ge ER 31 10 Limited Two Year Warranty cccssscccsssscccssseceseeee 32 2 Introduction Description The B amp K Precision model 1737 is a general purpose dual range DC power source This power supply can output more voltage at a lower current or more current at a lower voltage The 1737 provides 0 60 V DC output adjustable with both coarse and fine voltage controls for precise setting The current output for the 1737 is 0 3 A for the 0 30 V range and 0 2 A for the 30 60 V range adjustable with both coarse and fine current controls The 1737 exhibits excellent regulation and low ripple characteristics Its mechanical configuration conserves bench space and allows for easy portability Additionally the power supply can be operated locally from the front panel or remotely through the RS 232 interface This power supply is well suited for a wide variety of electrical and electronics applications in service shops engineering labs production facilities school laboratories and home use Features e Low ripple and noise e Excellen
27. uration Overview Baud Rate 9600 bps Parity Bits none Data Bits 8 Start Bits 1 Stop Bits 1 Flow Control Xon Xoff Termination Character r Table 1 RS232 Configuration 5 2 RS232 Commands 1 VOLT xx xx lt CR gt This command sets the output voltage value The output voltage takes the programmed value only if the power supply is in Constant Voltage mode Example The output voltage is set at 5 V VOLT 05 00 lt CR gt 2 CURR x xxx lt CR gt This command sets the output current value The output current takes the programmed value only if the power supply is in Constant Current mode Example The output current is set at 300 mA CURR 0 300 lt CR gt 18 3 SAVE lt CR gt The programmed values of the output current and voltage are saved If the power supply is restarted the values of the output current and voltage will be those previously saved 4 VOLT lt CR gt This command returns the voltage measured to the output terminals of the power supply xx xxV lt CR gt The voltage value returned is the same as the one displayed on the voltage display 5 CURR lt CR gt This command returns the current measured to the output terminals of the power supply x xxxA lt CR gt The current value returned is the same as the one displayed on the current display 6 STAT lt CR gt The power supply responds to this command with one of the following messages CV lt CR gt if the power su
28. y 8 Current Fine Control Fine adjustment of current limit Read value on the red LED display POWER CONTROLS 9 Power ON OFF Switch OUTPUT TERMINALS 10 Terminal Black Negative polarity output terminal 11 GND Terminal Earth and chassis ground 12 Terminal Red Positive polarity output terminal 3 2 Rear Panel Figure 2 Rear Panel 13 Power Cord 14 Fuse 15 RS 232 Interface Connector 4 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 60 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 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 e
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