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B&K 1785B - page 1
1 Instruction Manual Model 1785B, 1786B, 1787B & 1788 Programmable DC Power Supplies ...
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B&K 1785B - page 2
2 C ontent Quick Reference .............................................................................................................................. 3 About your safety ...................................................................................................................... 3 General information ................................... ...
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B&K 1785B - page 3
3 Quick Reference About your safety Pease review the following safety precautions before operating our equipment. General information The following safety precautions should be observed before using this product and any associated instrumentations. Although some instruments and accessories would be used with non - hazardous voltages, there are situ ...
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B&K 1785B - page 4
4 Certification and Warranty Certification We certify that this product met its published specifications at time of shipment from the factory. Introduction The 1785B - 1788 Series power supplies are high performance single - output programmable DC power supplies with communication interface . The combination of bench - top and system features in th ...
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B&K 1785B - page 5
5 The Front Panel at a Glance 3 4 5 7 6 1 2 3 4 5 7 6 1 2 ? 10 digits VFD display ? Sta tus information for operating mode and working status ? Power s witch ? Number keys ? Function keys ? UP / DO WN and ENTER key ? Output terminals ...
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B&K 1785B - page 6
6 Function k eys description Se t the output voltage value Se t the current value Sav e the present settings to a specified register location (1~16) Recall a s aved settings from location ‘‘1’’through ‘‘16’ Menu function to set related parameters of the power supply Output ON /OFF , to enable/disable the output Menu description > M ...
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B&K 1785B - page 7
7 Link The power supply is in communication mode Rmt The power supply is in remote mode Cal The power supply is in calibration mode The function keys are locked by password The rotate speed of cooling fan ON Output ON Oh Overheat protection state CV The power supply is in constant voltage mode. CC The power supply is in constant current mode. Unreg ...
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B&K 1785B - page 8
8 C hapter 1 Quick Start One of the first things you will want to do with your power supp ly is to become acquainted with the front panel. The exercises in this chapter prepare the power supply for use and help you get familiar with some of its f ront - panel operations. This chapter is intended for both the experienced and the inexperienced user b ...
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B&K 1785B - page 9
9 1.2 Output Checkout The following procedures check to e nsure that the power supply develops its rated outputs and properly responds to operation from the front panel. 1 .2.1 V oltage Output Checkout The following steps verify basic voltage functions with out load. 1 . Turn on the power supply . 2 . Enable the outp uts. Press key to let t he O N ...
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B&K 1785B - page 10
10 zero. 7 . Ensure that the current can be adjusted from zero to the full rated value. 8 . Turn off the power supply and remove the short wire from the output terminals. 1.3 If the Power Supply Does Not Turn On Use the following steps to help solve problems you might encounter when turning on the instrument. If you need more help, refer to chapter ...
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B&K 1785B - page 11
11 Bench - top viewing positions Carrying position 1.5 To Rack Mount the Instrument You can mount the power supply in a standard 19 - inch rack cabinet using the IT - E151 rack mount kit . Note: Remove the carrying handle and the two plastic ears before rack - mounting the instrum ent. To remo ve the handle, grasp the handle by sides and pull outwa ...
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B&K 1785B - page 12
12 To rack mount two ins truments side - by - side, order rack mount kit IT - E151 , you needn’t to use the front cover panel. Dimension unit (mm) Chapter 2 Specifications 2.1 Specifications Parameter 1785B 1786B 1787B 1788 Voltage 0 ~ 18V 0 ~ 32V 0 ~ 72V 0 ~ 32V Current 0 ~ 5A 0 ~ 3A 0 ~ 1.5V 0~6A O utput R atings , ( 0 °C - 40 °C) LVP 0 ~ 19V ...
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B&K 1785B - page 13
13 Voltage < 0.05% + 10mV Programming Accuracy, 12months , ( @ 25 °C ± 5 °C) ± ( % of out put+offset) Current < 0.2 % +10mA Voltage < 0.05% + 15 mV (<20V) , < 0.05% + 12 0mV ( = 2 0V) Readback A ccuracy 12months , (25 °C ± 5 °C) ± ( % of output+offset) Current < 0.1 % +1 5 mA Voltage = 1mVrms/3mVp - p Ripple (20Hz ~ 20MHz) ...
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B&K 1785B - page 14
14 Environmental Conditions Designed for indoor use in an installation c ategory II, pollution degree 2 envir onment. Designed to operate at maximum relative humidity of 95% and at altitudes of up to 2000 meters. Weight Type 1785B 1786B 1787B 1788 N.W 12.3Lbs. 5.6Kg 14.8Lbs. 6.7Kg 14.8Lbs. 6.7Kg 14.8Lbs. 6.7Kg G.W 14Lbs. 6. 4Kg 16.5Lbs. 7.5Kg 16.5L ...
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B&K 1785B - page 15
15 Chapter 3 Front - p anel Operation So far you have learned how to install your power supply and do quick s tart. During the quick start, you were briefly introduced to operating from the front panel as you learned how to check basic voltage and current functions. This chapter describes in detail the use of the front - panel keys and shows how th ...
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B&K 1785B - page 16
16 Step2. Press key . Step3. Use the num eric keys to or ? and ? keys to change the voltage value. Step4. Press to confirm the value 3.3 Constant Current Operation The constant current output range is from 0 A to the maximum current value of each type. It is very easy for you to set the constant current output. Step1. Power on the Power Supply Step ...
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B&K 1785B - page 17
17 Step2. Select >MAX VO LT by using ? and ? key . Step3. Press key . Step4. Change the voltage value by using num eric keys to or ? and ? key . Step5. Press key . n Initiat ing the Output state (>INIT OUT) This instruction can ini tiate the output state when the power supply is powered on. If you select ON, t he power supply will initiate th ...
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B&K 1785B - page 18
18 n Setting A d dress (>ADDRESS) This instruction can set the communicat ion address for each power supply . T he address range is from 0 to 254 . Before the communication, you must make sure that there is same address between the power supply and the compute r. n Setting password for function keys (> KEY LOCK) This instruction can set a pas ...
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B&K 1785B - page 19
19 Chapter 4 Remo te Operation Mode The DB9 interface connector on the rear panel of the power suppl y can be transferred to RS - 232 interface , the following information will tell you how to use the computer to control the output of the power suppl y. 4. 1 IT - E131 Communicati on cable The DB9 interface connector on the rear panel of power suppl ...
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B&K 1785B - page 20
20 4.3 Frame format Frame length is 26 bytes, the format is as follows: Start Address Command 4 - 25 bytes are information content Check sum Description: 1 . Start bit is AAH, occup ies a byte. 2 . Address range is 0 to FE , occupies a byte. 3 . C ommand occupies a byte. a . 20H ---- S et ting the remote control mode b . 21H ---- S et ting the outp ...
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B&K 1785B - page 21
21 3 rd byte Command ( 20H ) 4 th byte Operation mode( 0 represent front panel operation mode, 1 represent remote operation mode) 5 th to 25 th byte System reserve 26 th byte Check sum 2 . S et ting the output s tate ON/OFF ( 21H ) 1 st byte Start bit (AAH ) 2 nd byte Address (0 ~ 0XFE) 3 rd byte Command ( 21H ) 4 th byte Output state( 0 is OFF , 1 ...
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B&K 1785B - page 22
22 7 th byte The highest byte of output voltage value 8 th to 25 th byte System reserve 26 th byte Check sum 5 . Setting the output current ( 24H ) 1 st byte Start bit ( AAH ) 2 nd byte Address ( 0 ~ 0XFE) 3 rd byte Command ( 24H ) 4 th byte To set the low byte of current value 5 th byte To set the high byte of current value 6 th to 25 th byte Syst ...
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B&K 1785B - page 23
23 11 th byte To set the low byte of current value 12 th byte To set the high byte of current value 13 th byte B yte 0 of the maximum voltage value 14 th byte B yte 1 of the maximum voltage value 15 th b yte Byte 2 of the maximum voltage value 16 th byte Byte 3 of the maximum voltage value 17 th byte B yte 0 of output voltage value 18 th byte Byte ...
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B&K 1785B - page 24
24 1 st b yte Start bit( AAH ) 2 nd b yte Address( 0 ~ 0XFE) 3 rd b yte Command(28H) 4 th b yte Calibration protec tion state 5 th b yte System reserve 26 th byte Check sum 10 . C alibrating the voltage value (2 9H ) 1 st b yte Start bit(AAH) 2 nd b yte Address(0 ~ 0XFE) 3 rd b yte Command(29H) 4 th b yte Calibrated voltage points(point 1 - 3) 5 th ...
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B&K 1785B - page 25
25 13 . S ending the actual out put current to calibration program ( 2CH ) 1 st byte Start bit (AAH) 2 nd byte Address( 0 ~ 0XFE) 3 rd byte Command( 2CH ) 4 th byte The lower byte of the present current value 5 th byte The higher byte of the present current value 6 th to 25 th byte System reserve 26 th byte Check sum 14 . Save the calibration data ...
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B&K 1785B - page 26
26 2 nd byte Address (0 ~ 0XFE) 3 rd byte Command ( 31H ) 4 th to 8 th byte Product model(ASIC code) 9 th byte Lower byte of the software version 10 th byte Higher byte of the software version 1 1 th to 20 th byte Serial number(AS C II code) 21 st to 25 th byte System reserve 26 th byte Check sum 18 . Re store the factory default calibration data ( ...
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B&K 1785B - page 27
27 26 th byte Check sum Chapter 5 Calibration We suggest you to ca librate the power supply yearl y . W e provide you a set of calibration software Power Calibration ( PC 1785B_1788 ). I t is very easy to calibrate the power supply by the calibration software. Please make the following preparation before the calibration. 1. P lease prepare a high a ...
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B&K 1785B - page 28
28 5.1 Configur ation Start the PC 1785B_1788 System, the windows is as follows: The diagram of connecting the multi - meter to the calibrated power supply The diagram of connecting the multi - meter to the calibrated power supply Voltage calibration Current calibration Before the calibration, please click “Config” button to set the COM inter f ...
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B&K 1785B - page 29
29 When you measure the output voltage or short current by the multi - mete r , please make sure the value is correct. Otherwise it will cause the calibration failure and let the output turbulence. Please make sure that the maximum current of your multi - meter is higher than the maximum current of the calibrated power supply , otherwise it w ould ...
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B&K 1785B - page 30
30 6.3 Functions of PV1785B_1788 Start the s oftware PV1785B_1788 , the windows is as follows: 1 4 2 3 5 8 6 7 9 10 11 C onfigure the software operati on environments . Voltage chart , it can show you a chart of the voltage . Current chart : it can show you a chart of the current. To set the remote mode of power supply . To set the output state ON/ ...
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B&K 1785B - page 31
31 6.3.1 Configure the system The first step for communicat io n is to configure the system, c lick Configure button , t he windows will display as follows: Note : W hen you set the communication port , please make sure that the baud rate and addre ss of the computer are the same as the power supply . 6.3. 2 Status bar Status bar will give you the ...
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B&K 1785B - page 32
32 6.3.3 S et ting Voltage and current 1. Setting voltage/current by rotary knob Note: Before you set the current and voltage value from the compute r , please change the opera tion mode to PC Control mode by pressing button. 2. Quick ly setting Use mouse to click on the rotary knob and move mouse to change the value. You also can use mouse wheel, ...
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B&K 1785B - page 33
33 3. Program set ting 6.3.4. GO/NG Test Function Program: Right - click on the Program area, the program tools (Append a line, Insert a line, Delete a line, Delete Select etc.) will appear on the windo w . Click the tools to program the steps. Double - click on each value to change them from key board as you desired. Also you can change the time u ...
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B&K 1785B - page 34
34 6.3.5 Save and Open To save the pr ogram settings , quickly settings, voltage sweep settings and GO/N G settings as PAR file. To open the PAR file for re loading the program settings, quickly settings, voltage sweep settings and GO/NG settings. 6.3. 6 Present Voltage/Curr ent Chart 6.3.7. Chart Description The voltage and current chart can help ...
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B&K 1785B - page 35
35 To set the X - Axes Span To set the Y - Axes Span To set the limit position Click here and move to zoom in/out axes or scroll axes To set the ring buffer size Vertical marker Horizontal marker XY Value marker Limit range between the minimum value and maximum value. Scroll axes mode Zoom in/out axes mode Zoom out Zoom in Save the chart as a .BMP ...
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B&K 1785B - page 36
36 Limited One - Year Warranty B&K Precision Corp. warrants to the original purchaser that its product and the component part s thereof, will be free from defects in workmanship and materials for a period of one year from the data of purchase. B&K Precision Corp. will, without charge, repair or replace, at its’ option, defective product o ...
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B&K 1785B - page 37
37 Service Information Warranty Service: Please return the product in the original packaging with proof of purchase to the below address. Clearly state in writing the performan ce problem and return any leads, connectors and accessories that you are using with the device. Non - Warranty Service: Return the product in the original packaging to the b ...
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B&K 1785B - page 38
38 22820 Savi Ranch Parkway Yorba Linda, CA 92887 USA TEL: 714 - 921 - 9095 FAX: 714 - 921 - 64 22 ww w .bkprecision.com PN: 481 - 534 - 9 - 001 Printed in China 2005 B&K Precision Corp. ...
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