BK Precision 1785B Instruction Manual
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BK Precision 1785B Instruction Manual

BK Precision 1785B Instruction Manual

Programmable dc power supplies
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Instruction Manual
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1785B, 1786B, 1787B & 1788 Programmable DC Power Supplies

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Summary of Contents for BK Precision 1785B

  • Page 1 Instruction Manual Model 1785B, 1786B, 1787B & 1788 Programmable DC Power Supplies...

  • Page 2: Table Of Contents

    Content Quick Reference ..........................3 About your safety........................3 General information......................3 Protection from electric shock ...................3 Definition of users......................3 Introduction ..........................4 The Front Panel at a Glance ....................5 Function keys description ......................6 Menu description ........................6 Display annunciators ........................6 The Rear Panel at a Glance .....................7 Chapter 1 Quick Start ........................8 1.1 Preliminary Checkout ......................8 1.2 Output Checkout.........................9...

  • Page 3: Quick Reference

    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 situations where hazardous conditions may be present.

  • Page 4: Introduction

    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 these power supplies provides versatile solutions for your design and test requirements.

  • Page 5: The Front Panel At A Glance

    The Front Panel at a Glance 10 digits VFD display Status information for operating mode and working status Power switch Number keys Function keys UP/DOWN and ENTER key Output terminals...

  • Page 6: Function Keys Description

    Function keys description Set the output voltage value V-set Set the current value I-set Save the present settings to a specified register location(1~16) Save Recall a saved settings from location ‘‘1’’through ‘‘16’ Recall Menu function to set related parameters of the power supply Menu Output ON/OFF, to enable/disable the output Out on/off...

  • Page 7: The Rear Panel At A Glance

    Output ON Output ON Link The power supply is in communication Link The power supply is in communication Overheat protection state Overheat protection state mode mode The power supply is in constant The power supply is in constant The power supply is in remote mode The power supply is in remote mode voltage mode.

  • Page 8: Chapter 1 Quick Start

    Chapter 1 Quick Start One of the first things you will want to do with your power supply 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 front-panel operations.

  • Page 9: Output Checkout

    1.2 Output Checkout The following procedures check to ensure that the power supply develops its rated outputs and properly responds to operation from the front panel. 1.2.1 Voltage Output Checkout The following steps verify basic voltage functions without load. 1. Turn on the power supply. 2.

  • Page 10: If The Power Supply Does Not Turn On

    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.

  • Page 11: To Rack Mount The Instrument

    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 instrument. To remove the handle, grasp the handle by sides and pull outwards and rotate it to a special position to let the arrow on the handle and the arrow on the plastic ears be in opposite directions, then pull the handle outward.

  • Page 12: Chapter 2 Specifications

    To rack mount two instruments side-by-side, order rack mount kit IT-E151, you needn’t to use the front cover panel. unit (mm) Dimension Chapter 2 Specifications 2.1 Specifications Parameter 1785B 1786B 1787B 1788 0 ~18V 0 ~32V 0 ~72V 0 ~32V...

  • Page 13: Supplemental Characteristics

    <0.05% + 10mV Voltage Programming Accuracy, 12months, (@ 25 °C ± 5 °C) ±(% of output+offset) <0.2% +10mA Current <0.05%+15mV(<20V), Voltage Readback Accuracy <0.05%+120mV(= 2 0V) 12months, (25 °C ± 5 °C) ±(% of output+offset) <0.1% +15mA Current = 1 mVrms/3mVp-p Voltage Ripple (20Hz ~20MHz)
  • Page 14 Environmental Conditions Designed for indoor use in an installation category II, pollution degree 2 environment. Designed to operate at maximum relative humidity of 95% and at altitudes of up to 2000 meters. Weight Type 1785B 1786B 1787B 1788 12.3Lbs. 14.8Lbs.

  • Page 15: Chapter 3 Front-Panel Operation

    Chapter 3 Front-panel Operation So far you have learned how to install your power supply and do quick start. 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.

  • Page 16: Constant Current Operation

    V-Set Step2. Press key. Step3. Use the numeric keys keys to change the voltage value. Step4. Press to confirm the value Enter 3.3 Constant Current Operation The constant current output range is from 0A to the maximum current value of each type. It is very easy for you to set the constant current output.
  • Page 17 Step2. Select >MAX VOLT by using key. Step3. Press key. Enter Step4. Change the voltage value by using numeric keys key. Step5. Press key. Enter Note: After you setting the maximum voltage value, the output voltage setup should be in the range from 0 volt to maximum voltage. The default maximum voltage is the full voltage range of its model.
  • Page 18 n Setting Address (>ADDRESS) This instruction can set the communication address for each power supply. The 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 computer. Note: Default address is 0.

  • Page 19: Chapter 4 Remote Operation Mode

    Chapter 4 Remote Operation Mode interface connector The DB9 on the rear panel of the power supply 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 supply.

  • Page 20: Frame Format

    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, occupies a byte. 2. Address range is 0 to FE, occupies a byte. 3.
  • Page 21 Command ( 20H) byte byte Operation mode(0 represent front panel operation mode, 1 represent remote operation mode) to 25 byte System reserve byte Check sum Note: You can not control the power supply from the front panel when the power supply is in calibration mode. 2.
  • Page 22 byte The highest byte of output voltage value to 25 byte System reserve byte Check sum Note: We use 4 bytes of Hex number to represent an output voltage value. For example the output voltage value is 16.000V and the hex code of 16.000 is 0X00003EB0, so the 4 byte is 0XB0, 5 byte is 0X3E, 6...
  • Page 23 byte To set the low byte of current value byte To set the high byte of current value byte Byte 0 of the maximum voltage value byte Byte 1 of the maximum voltage value byte Byte 2 of the maximum voltage value byte Byte 3 of the maximum voltage value byte...
  • Page 24 byte Start bit(AAH) byte Address(0~0XFE) byte Command(28H) byte Calibration protection state byte System reserve byte Check sum 10. Calibrating the voltage value (29H) byte Start bit(AAH) byte Address(0~0XFE) byte Command(29H) byte Calibrated voltage points(point 1-3) to 25 byte System reserve byte Check sum Note:...
  • Page 25 Note: To calibrate the 2 points of the current value sequentially. 13. Sending the actual output current to calibration program (2CH) byte Start bit (AAH) byte Address(0~0XFE) byte Command(2CH) byte The lower byte of the present current value byte The higher byte of the present current value to 25 byte System reserve...
  • Page 26 byte Address (0~0XFE) byte Command( 31H) to 8 byte Product model(ASIC code) byte Lower byte of the software version byte Higher byte of the software version to 20 byte Serial number(ASCII code) to 25 byte System reserve byte Check sum Note: For example, the serial number is 000045, the product model is IT 6811, and software version is V2.03, then the returned data is as follows:...

  • Page 27: Chapter 5 Calibration

    byte Check sum Note: When the power supply receives a frame command, it will check the frame command, if the check sum is correct, then it will return to 90H, if there is any error on setting parameter or over parameter, then it will return to A0H, if the command wasn’t executed, then it will return to B0H, if the command isn’t effective, then it will return to C0H.

  • Page 28: Configuration

    5.1 Configuration Start the PC1785B_1788 System, the windows is as follows: The diagram of Voltage connecting the multi- calibration meter to the calibrated power supply The diagram of Current connecting the multi- calibration meter to the calibrated power supply Before the calibration, please click “Config” button to set the COM interface, address and baud rate. The default Com port is COM, and the default baud rate is 9600.

  • Page 29: Reset To The Default Calibration Settings

    Chapter 6 PV1785B_1788 Software 6.1 Introduction Software PV1785B_1788 is control software for 1785B - 1788 series programmable power supplies. It can work with all single-output power supply models. Please make sure that you purchased IT-E131 communication cable, and use IT-E131 to connect the power supply and computer before the communicating.

  • Page 30: Pv1785B_1788 Functions

    6.3 Functions of PV1785B_1788 Start the software PV1785B_1788, the windows is as follows: Configure the software operation 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.

  • Page 31: 1Configure The System

    6.3.1Configure the system The first step for communication is to configure the system, click Configure button , the windows will display as follows: 1) Comm: to set the communication port, baud rate and address. 2) 2) Max voltage: to set a maximum voltage value in the voltage range.

  • Page 32: Setting Voltage And Current

    6.3.3 Setting Voltage and current 1. Setting voltage/current by rotary knob Use mouse to click on the rotary knob and move mouse to change the value. You also can use mouse wheel, or Page Up/Down keys and arrow keys (?, ?, ? , ? ) from the keyboard to change the voltage value more slightly.

  • Page 33: Go/Ng Test Function

    3. Program setting 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 window. Click the tools to program the steps. Double-click on each value to change them from key board as you desired.

  • Page 34: Save And Open

    6.3.5 Save and Open To save the program settings, quickly settings, voltage sweep settings and GO/NG settings as PAR file. To open the PAR file for reloading the program settings, quickly settings, voltage sweep settings and GO/NG settings. 6.3.6 Present Voltage/Current Chart Double click the voltage chart, the voltage chart will be enlarged and will...
  • Page 35 Click here and move to zoom in/out axes or scroll axes To set the ring buffer size To set the limit position To set the X-Axes Span To set the Y-Axes Span 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...
  • Page 36 Limited One-Year Warranty B&K Precision Corp. warrants to the original purchaser that its product and the component parts 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 or component parts.
  • Page 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 performance 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 below address.
  • Page 38 22820 Savi Ranch Parkway Yorba Linda, CA 92887 TEL: 714-921-9095 PN: 481-534-9-001 FAX: 714-921-6422 Printed in China www.bkprecision.com ©2005 B&K Precision Corp.

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1786b1787b1788

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