BK Precision 1687B Instruction Manual
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BK Precision 1687B Instruction Manual

Switching dc power supply
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1685B, 1687B, 1688B
Switching DC Power Supply
INSTRUCTION MANUAL

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Summary of Contents for BK Precision 1687B

  • Page 1 Model 1685B, 1687B, 1688B Switching DC Power Supply INSTRUCTION MANUAL...

  • Page 3: Safety Summary

    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.
  • Page 4 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.
  • Page 5 Compliance Statements Disposal of Old Electrical & 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, and should not be disposed of as...

  • Page 6: Table Of Contents

    Contents Safety Summary ..................1 Introduction ....................6 Controls and Indicators ................7 Front Panel ..................7 Rear Panel ..................8 Operating Instructions ................9 Using the Power Supply ..............10 4.1.1 Connection ................10 4.1.2 Self Test Sequence ..............10 4.1.3 Control Knobs ................
  • Page 7 5.1.2 Using Two 5 kΩ Variable Resistors .......... 19 5.1.3 Enable and Disable the Output ..........20 PC Interface Control ................ 21 5.2.1 General Functions and Display ..........21 5.2.2 External Timed Program ............22 5.2.3 Internal Preset Memory ............23 5.2.4 Data Log ..................

  • Page 8: Introduction

    Introduction B&K Precision models 1685B, 1687B, and 1688B are laboratory grade switching mode DC power supplies with high current output in a small form factor and lightweight package. The 1685B Series provides various configurations of output voltage and current, and make setting voltage and current levels fast and precise through its dual action, coarse/fine rotary encoder control knobs.

  • Page 9: Controls And Indicators

    Controls and Indicators Front Panel Figure 1 - Front Panel LED panel meter display with CV/CC indicator Rear Control Indicator (lights up when using Preset/Remote Control/Set mode) Output Voltage Control Knob (control main and auxiliary output voltage) Output Current Control Knob (control main and auxiliary output current limit) Power ON/OFF Switch Auxiliary Output Terminal (max 5 A) Section 4.1.4...

  • Page 10: Rear Panel

    Rear Panel Figure 2 - Rear Panel Main Output Terminal (max 5 A for 1685B / 10 A for 1687B / 20 A for 1688B) Section 4.1.4 Note: Please see for more details on using both main and auxiliary output terminals together.

  • Page 11: Operating Instructions

    Model Number Output Voltage Range Total Rated Current 1685B 1 – 60 V 0 – 5 A 1687B 1 – 36 V 0 – 10 A 1688B 1 – 18 V 0 – 20 A Table 1 - Model Table...

  • Page 12: Using The Power Supply

    Using the Power Supply 4.1.1 Connection To connect the equipment to the power supply, follow the steps below. 1. Check the rating label of the power supply and confirm that it complies with your AC mains voltage. 2. Connect the power supply to the AC mains using the provided power cord and make sure the Mode Selection Switch is in the Normal position.
  • Page 13 Front Panel Display Test Segment check C.V. indicator check C.C. indicator check Rear control indicator check Return to C.V. Start power supply checks Overvoltage protection check Overload protection check...

  • Page 14: Control Knobs

    Front Panel Display Test Overtemperature protection check Fan check Output off (remote control mode) Table 2 - Self Test Sequence The LED and other indicators on the front panel will be turned on. When the cooling fan is being checked, a loud fan noise can be heard. After the self checks, the CV, V, and A LED indicators are lit up displaying voltage and 0.0 current.

  • Page 15: Using Both Main And Auxiliary Outputs

    Note: 1685B: Total rated current (Aux. + Main) is 5 A 1687B: Total rated current (Aux. + Main) is 10 A 1688B: Total rated current (Aux. + Main) is 20 A Control Modes There are four different control modes for the power supply: •...

  • Page 16: Normal Mode

    The user can also set custom output voltage and current using Set Mode. Please refer Section 4.2.3 for details. Recall No. Output Voltage Output Current Maximum 13.8 V Maximum Model 1685B: 55 V Model 1687B: 25 V Maximum Model 1688B: 15 V Table 3 - Default Presets...

  • Page 17: Set Mode

    4.2.3 Set Mode First, enter Set Mode by pushing Mode Selection Switch to “Set” position. To define the preset output P1/P2/P3 1. Select the Recall Switch to the position you want to set: P1, P2, or P3. 2. Adjust the front panel voltage control knob to set your desired voltage value.

  • Page 18: Analog Remote Control Mode

    4.2.4 Analog Remote Control Mode Select this mode to control the output voltage and current via remote control Section 5.1 connector. Please refer to for more details. Remote Control There are two methods to remotely control voltage and current. Note: Both methods require the remote control connector plug to be set up in order for analog remote control mode to be functional;...
  • Page 19 Figure 4 - Pin Numbers Make sure the load is disconnected and the power supply is OFF. Plug the remote connector plug into the analog remote control terminal of the power supply. Secure the remote connector plug to the terminal socket by screwing in the Figure connector ring ( Figure 5 - Connector Ring...

  • Page 20: Using Two External Variable Dc Voltage Sources

    5.1.1 Using Two External Variable DC Voltage Sources FUNCTIONS REMARKS Internal DC +5 V Less than 50 mA Voltage Adjust 0 – 5 V Current Adjust 0 – 5 V Ground Output OFF Short to Ground Table 4 – Remote Connector Plug Pin Assignment for External Variable Voltage Sources A variable external DC voltage source of 0 –...

  • Page 21: Using Two 5 Kω Variable Resistors

    5. Switch on the power supply. 6. Check the output voltage range of the power supply by varying the external voltage source for voltage adjustment from 0 to 5 V. 7. Short circuit the main output with an 8AWG gauge wire and check the display for CC setting by varying the external voltage source for current adjustment from 0 to 5 V.

  • Page 22: Enable And Disable The Output

    FUNCTIONS REMARKS Internal DC +5 V Resistor end Voltage Adjust Variable part of resistor Current Adjust Variable part of resistor Ground Resistor end Output OFF Short to Ground Table 5 – Remote Connector Plug Pin Assignment for Variable Resistors 3. Turn the remote control ON/OFF switch to ON position. 4.

  • Page 23: Pc Interface Control

    Shorting Pin 5 to Pin 4 (ground) will turn the output off. When output is off, the CV and CC LED will flash. The current output voltage and current setting will show on the panel meter. You can also adjust the output by voltage and current control knob to your desired value when output is off.

  • Page 24: External Timed Program

    5.2.2 External Timed Program External Timed Program is completely controlled by the PC. The PC counts the step time and changes the specified voltage and current levels of the power supply. Figure 8 - External Timed Program External Timed Program Procedure 1.

  • Page 25: Internal Preset Memory

    5.2.3 Internal Preset Memory The Internal Preset Memory tab allows you to define the power supply’s presets remotely. Figure 9 - Internal Preset Memory Internal Preset Memory Procedure 1. Select Internal Preset Memory tab to switch to the Internal Preset Memory function.

  • Page 26: Data Log

    5.2.4 Data Log The Data Log window can be used to view present or stored output data. All parameters at the bottom of the window can be changed via direct entry from the PC and confirmed by pressing Enter or selecting the values from the drop down menu. Figure 10 - Data Log Window Parameters in Data Log V Min: Minimum voltage level...
  • Page 27 To save a data log, enter Log Name in box and click the “Save Log” icon. After saving, the log can be retrieved by selecting it in the Log Name drop down menu. Data logs can be classified, stored, exported to a csv file, printed, or retrieved for use at any time.

  • Page 28: Settings

    5.2.5 Settings Use this tab to configure your settings. Figure 12 - Settings Configuration Data Log Sampling Time: You can select your desired data log sampling time from 1 second and up. Voltage Upper Limit (UVL) Setting: You can set your output voltage upper limit value to safeguard your low voltage applications.
  • Page 29 Command line format: COMMAND<parameter1><parameter2>…[CR] Current value will have one decimal place for models 1687B and 1688B, and two decimal places for Model 1685B. Command code & Function Example Return value Input command: Set voltage level Input command: VOLT{<voltage>}[CR] <voltage> = 000-XXX...
  • Page 30 Command code & Function Example Return value Input command: Get display voltage, Input command: GETD[CR] current, and status GETD[CR] reading from power Return value: supply Return value: [voltage][current][stat 030201450 us][CR] [voltage] = 0000-XXXX OK[CR] [current] = 0000-XXXX [status] = 0|1 (0=CV, Indicates voltage reading is 3.02 1=CC) V and current reading is 1.45 A.
  • Page 31 Command code & Function Example Return value Input command: Output On/Off control Input command: SOUT{<output>}[CR] SOUT1[CR] <output> = 0|1 Return value: 0=ON Return value: OK[CR] 1=OFF OK[CR] Switches output OFF Input command: Set upper voltage limit Input command: SOVP{<voltage>}[CR] of power supply SOVP151[CR] Return value: <voltage>...
  • Page 32 Command code & Function Example Return value Input command: Get upper current Input command: GOCP[CR] limit of power supply GOCP[CR] Return value: [current] = 000-XXX Return value: [current][CR] OK[CR] Indicates maximum current limit is set to 5.2 A Input command: Get power supply Input command: GMAX[CR]...

  • Page 33: Faults And Troubleshooting

    Faults and Troubleshooting OVP: Overvoltage Protection This unit has a built-in tracking overvoltage protection feature. In the event of the output voltage becoming greater than the set value (see specified range from Specifications section), protection will be triggered, and the output power will be cut off.

  • Page 34: Olp: Overload Protection

    Figure 14 - Overtemperature Protection When you get this warning, switch off the unit and remove all loading. Check your load and output settings and allow the unit to cool down for at least 30 minutes. Check if any of the ventilation is blocked and make sure there is enough clearance around the power supply.

  • Page 35: Fuse Replacement

    Figure 15 - Overload Protection To reset this warning, switch off the unit and remove all connected devices. Switch the unit back on again and double check with caution. If the problem persists, please contact B&K Precision. Fuse Replacement If the fuse blows, the CV or CC indicators will not light and the power supply will not operate.

  • Page 36: Specifications

    Specifications Models 1685B 1687B 1688B Output Variable Output Voltage 1 – 60 V 1 – 36 V 1 – 18 V Variable Output Current 0 – 5 A 0 – 10 A 0 – 20 A Voltage Regulation Load (0-100% Load) ≤...
  • Page 37 Models 1685B 1687B 1688B O/P 1-5 V: set O/P 1-5 V: set voltage +2 V voltage +2 V O/P 1-5 V: set Tracking Overvoltage O/P 5-20 V: set O/P 5-20 V: set voltage +2 V Protection voltage +3 V voltage +3 V...

  • Page 38: Certification

    Certification CE Compliant CE Declaration of Conformity The power supply meets the requirements of 2006/95/EC Low Voltage Directive and 2004/108/EC Electromagnetic Compatibility Directive. Low Voltage Directive EN 60950-1 EN 61010-1 EMC Directive EN 55011 EN 55022 EN 55024 EN61000-3-2 EN61000-3-3 EN61000-6-1...

  • Page 39: Service Information

    Service Information 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 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.

  • Page 40: Limited Two-Year Warranty

    Limited Two-Year Warranty B&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&K Precision Corp. will, without charge, repair or replace, at its option, defective product or component parts.
  • Page 41 (Page intentionally left blank)
  • Page 42 22820 Savi Ranch Parkway Yorba Linda, CA 92887 www.bkprecision.com © 2012 B&K Precision Corp. Printed in Hong Kong v032212...

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