B+K precision 1685B Manuel du propriétaire

Model: 1685B, 1687B, 1688B, 1900B, 1901B, 1902B

Switching DC Power Supplies

PROGRAMMING MANUAL

Table of Contents

1USB Interface Connection.............................................................................2

1.1 USB (Virtual COM) Configuration ..................................................................................... 2

2PC Software..................................................................................................2

2.1 General Functions and Display......................................................................................... 2

2.2 External Timed Program................................................................................................... 5

2.3 Internal Preset Memory ................................................................................................... 6

2.4 Data Log............................................................................................................................ 7

2.5 Settings............................................................................................................................. 8

2.6 Power Supply Calibration ................................................................................................. 9

3Command Set.............................................................................................11

1USB Interface Connection

Users can remotely control the power supply via PC over the USB interface. Upon installation of the USB driver, the

PC can control the instrument over virtual COM.

Connecting Instrument to PC

1. Download the USB drivers from www.bkprecision.com .

2. Connect the included USB cable to the power supply and the USB port on the PC.

3. When Windows recognizes the USB connection, do not follow the default Windows driver installation wizard.

Simply run the setup file from the downloaded USB drivers and follow the prompt to install drivers.

4. The computer will recognize the instrument as a USB (virtual COM) device, meaning it will be detected as a serial

COM port. Windows will automatically assign a COM port to the instrument. Please verify which COM port

Windows has assigned by going into Device Manager.

1.1 USB (Virtual COM) Configuration

The following serial port settings are used by the power supply.

Baudrate: 9600

Data bits: 8

Parity: None

Stop bits: 1

Flow Control: None

2PC Software

2.1 General Functions and Display

Note: The power supply must be in Normal Mode and operated as a standalone equipment (not connected in

series or parallel with multiple supplies) for PC interface control.

The remote control PC software will display all output voltage, current, and power readings. Voltage and current

values can be set using either the text box or slide bar. The output status is shown on the display panel and can be

clicked to set the power supply output ON or OFF.

Figure 2.1 - PC Software General Functions and Display

1. Display panel

Shows real-time information of power supply’s output and setting voltage and current.

2. Main configuration and data log display panel

Use to change general setting of program and display data log.

3. Voltage and current setting panel

Use to set output value and output On/Off.

4. File panel

Use to save, load, and print data.

5. File description input

Use to enter description of program or log file.

6. Program running cycle setting panel

Use to set running cycle for External Timed Program.

7. Information panel

Use to display maximum voltage/current, sampling time, upper voltage/current limit, and software

version.

Figure 2.2 - Display Panel

Figure 2.3 - Output Configuration Panel

You can directly type the desired output voltage and output current and then click “Set” button to set the value or

use the slide bar to adjust the value.

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 2.4 - External Timed Program

External Timed Program Procedure

1. Select the External Timed Program tab to switch to the External Timed Program tab.

2. Set voltage, current, and time parameters for number of steps (max 20) needed in timed program. Values

can be configured using the slide bar or set incrementally by pressing the left and right arrow keys on your

keyboard.

3. Specify desired number of running cycles. Up to 999 running cycles can be entered. Enter 0 for continuous

cycle.

4. To run the timed program, click the “Run” button. During running cycles, the “Stop” button can be clicked

to stop the program.

5. To save and export the table to a '.csv’ file, enter Table Name in text box and click the “Save” icon. The

timed program table data can be retrieved or printed by clicking the “Load” and “Print” icons.

6. To delete all data in the table, click the “Clear Table” button.

2.3 Internal Preset Memory

The Internal Preset Memory tab allows you to define the power supply’s presets remotely.

Figure 2.5 - Internal Preset Memory

Internal Preset Memory Procedure

1. Select Internal Preset Memory tab to switch to the Internal Preset Memory function.

2. Enter in desired Voltage and Current values for Presets 1, 2, and 3.

3. Click “Set” to select and save Presets.

4. To retrieve power supply’s stored presets, click the “Read from PS” button.

5. Retrieved data will be shown in red if they exceed the present preset upper voltage and current limit value.

6. To save the table, enter Table Name in text box and click “Save” icon. Data of different groups of presets can

be classified, stored, exported to a csv file, printed, or retrieved for use at any time.

7. To delete all data in the table, click the “Clear Table” button.

2.4 Data Log

The Data Log window can be used to view real-time or stored output voltage, current, and power data. Move left

and right along the graphed data by adjusting the “Move” slide bar. Zoom In/Out of the graph by adjusting the

“Zoom” slide bar.

Figure 2.6 - Data Log Window

To save and export a data log to a ‘.csv’ file, enter Log Name in text box and click the “Save” icon.

The log can be retrieved or printed by clicking the “Load” and “Print” icons.

Time Frame Concept of Data Log

The data logging function always starts when the software begins to run.

0 seconds on the right hand side of the X-axis indicates real-time data with the length of time lapsed on the left

hand side.

The X-axis is adjustable using the “Move” and “Zoom” slide bars so that any time period of the log can be

displayed for analysis.

2.5 Settings

Use this tab to configure general settings. The software will automatically detect power supply model and COM

port used. If not found, please recheck COM port or USB driver installation as mentioned in “USB Interface

Connection” section.

Figure 2.7 - 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 power supply’s upper voltage limit value to safeguard your low

voltage applications.

Current Upper Limit (UCL) Setting: You can set your power supply’s upper current limit value to safeguard your low

current applications.

Note: Any changes to the UVL and UCL settings will be saved on the power supply. These values can only be set

through remote PC software.

Update Firmware: The power supply’s firmware could be updated by the user through the software for future

versions. This is only available for power supplies with firmware version 3.1 or above.

2.6 Power Supply Calibration

Note: Software calibration only available for firmware 3.1 or above.

B&K Precision recommends a calibration interval of one year to ensure that the power supply meets specifications.

This instrument features closed-case calibration. To perform the calibration, the following equipment is required:

Digital multimeter

DC electronic load

The following calibration instructions may be used by authorized technicians or calibration personnel

only. If you are not authorized, do not attempt to calibrate the instrument yourself, as it may damage the

instrument and void the warranty.

Please refer to the following figure to connect your power supply for Voltage and Current Calibration.

Figure 2.8 - Connection Setup for Calibration

Click on the Calibration tab.

Figure 2.9 - Calibration Screen

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