BK Precision 1788, 1787B, 1786B, 1785B User Manual

Model

1785B, 1786B, 1787B & 1788 Programmable DC Power Supplies

Instruction Manual

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

1.2.1 Voltage Output Checkout.........................................................................................9

1.2.2 Current Output Checkout.........................................................................................9

1.3 If the Power Supply Does Not Turn On............................................................................10

1.4 To Adjust the Carrying Handle.........................................................................................10

1.5 To Rack Mount the Instrument.........................................................................................11

Chapter 2 Specifications................................................................................................................12

2.1 Specifications....................................................................................................................12

2.2 Supplemental Characteristics...........................................................................................13

Chapter 3 Front-panel Operation...................................................................................................15

3.1 Front-panel Operation Overview......................................................................................15

3.2 Constant Voltage Operation.............................................................................................15

3.3 Constant Current Operation .............................................................................................16

3.4 Saving and Recalling Operation.......................................................................................16

3.5 Menu Operation................................................................................................................16

Chapter 4 Remote Operation Mode...............................................................................................19

4.1 Communication setting.....................................................................................................19

4.2 DB9 interface details.........................................................................................................19

4.3 Frame format....................................................................................................................20

4.4 Communication protocol...................................................................................................20

Chapter 5 Calibration.....................................................................................................................27

5.1 Configuration.............................................................................................................28

5.2 Voltage calibration ............................................................................................................28

5.3 Current calibration ............................................................................................................28

5.4 Reset to the default calibration settings ...........................................................................29

Chapter 6 PV1785B_1788 Software..............................................................................................29

6.1 Introduction.......................................................................................................................29

6.2 System installation............................................................................................................29

6.3 PV1785B_1788 Functions................................................................................................30

6.3.1Configure the system ..............................................................................................31

6.3.2 Status bar ...............................................................................................................31

6.3.3 Setting Voltage and current....................................................................................32

6.3.4. GO/NG Test Function............................................................................................33

6.3.5 Save and Open ......................................................................................................34

6.3.6 Present Voltage/Current Chart...............................................................................34

6.3.7. Chart Description...................................................................................................34

Certification and Warranty........................................................................................................4

Certification..........................................................................................................................

Warranty..............................................................................................................................

Limitation of Warranty .........................................................................................................

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.

This product is intended for use by qualified personnel who recognize shock hazards and are familiar with the safety precautions required to avoid possible injury. Read and follow all installation, operation, and maintenance information carefully before using the product. Refer to this manual for complete product specifications. If the product is used in a manner not specified, the protection provided by the product may be impaired. Before performing any maintenance, disconnect the line cord and all test cables.

Protection from electric shock

Operators of this instrument must be protected from electric shock at all times. The responsible body must ensure that operators are prevented access and/or insulated from every connection point. In some cases, connections must be exposed to potential human contact. Product operators in these circumstances must be trained to protect themselves from the risk of electric shock. If the circuit is capable of operating at or above 1000 volts, no conductive part of the circuit may be exposed.

Definition of users

Responsible body is the individual or group responsible for the use and maintenance of equipment is operated within its specifications and operating limits, and for ensuring that operators are adequately trained. Operators use the product for its intended function. They must be trained in electrical safety procedures and proper use of the instrument. They must be protected from electric shock and contact with hazardous live circuits. Service is only to be performed by qualified service personnel. Safety symbols and terms

Connect it to safety earth ground using the wire recommended in the user manual.

The symbol on an instrument indicates that the user should refer to the

operating instructions located in the manual.

High voltage danger

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

Convenient bench-top features:

• Nice appearance, small-size and light weight

• VFD display

• Soft Rubber numeric keypad

• Adjustable & constant voltage outputs

• Adjustable & constant current outputs

• Output on/off

• High accuracy and high resolution

• Excellent load and line regulation

• Low ripple and noise

• Limit voltage protection

• Over current/temperature protection

• Sixteen operating states storage

• May be used in series or parallel modes with additional power supplies

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

V-set I-set Save

Menu Recall

Out on/off

Function keys description

Set the output voltage value

Set the current value

Save the present settings to a specified register location(1~16)

Recall a saved 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

>MAX VOLT

Set the maximum output voltage value

>INIT OUT Initiate the output state to ON or not >INIT VOL Initiate the output voltage to 0 volt or not >KEY SOUN Switch On/Off the buzzer sound when you press

any key

>BAUDRATE Set the communication baud rate >ADDRESS Set the communication address >KEY LOCK Set the password for function keys >EXIT Exit

Display annunciators

ON Output ON

ON Output ON Oh Overheat protection state

Oh Overheat protection state CV The power supply is in constant

CV The power supply is in constant

voltage mode.

CC The power supply is in constant

current mode.

Unreg The output of the power supply

is unregulated (neither CV nor CC)

The Rear Panel at a Glance

Link The power supply is in communication

mode

Rmt The power supply is in remote mode

Rmt The power supply is in remote mode Cal The power supply is in calibration mode

Cal The power supply is in calibration mode

The function keys are locked by password

The function keys are locked by password The rotate speed of cooling fan

The rotate speed of cooling fan

1 2 43 51 2 43 5

? Cooling window ? DB9 interface connector ? 110V/220V selector ? Fuse ? Power socket

ERR EEPROM

ERROR CAL

Warning

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.

This chapter is intended for both the experienced and the inexperienced user because it calls attention to certain checks that should be made prior to operation.

1.1 Preliminary Checkout

The following steps help you verify that the power supply is ready for use.

1. Check the list of supplied items.

Verify that you have received the following items with your power supply. If anything is missing, contact your nearest Sales Office.

? One power cord for your location ? This User’s Manual. ? Communication cable (optional)

2. Connect the power cord and turn on the power supply.

When you turn on the power supply, the front-panel display will light up briefly while the power supply performs its power-on self-test. All the VFD annunciators will light up at once. To review the display with all annunciators, you can check if there is any stroke loss on any annunciator. If there isn’t any response when you power on the power supply, please see Section 1.5 on page 10 for some service information.

If the EEPROM was damaged or the latest operation data in EEPROM was lost, the VFD will display as follows:

If the calibration data in EEPROM was lost, the VFD will display as follows:

the third conductor being the ground. The power supply is grounded only when the power-line cord is plugged into an appropriate receptacle. Do not operate your power supply without adequate cabinet ground connection.

: Your power supply is equipped with a 3-wire grounding type power cord;

Out

on/off

Out

on/off

Out

on/off

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. Enable the outputs.

Press key to let the ON annunciator and the CV annunciator turn on to light. Notice: if the voltage value flash, then the power supply is in Set mode, ‘‘Set mode’’ means that the VFD display shows the setting output voltage and current. Or the power supply is in Meter mode, ‘Meter mode” means that the VFD display shows the actual output voltage and current.

3. Check that the front-panel voltmeter properly responds to number keys

Set some different voltage values, then wait till the Meter mode to check if the VFD displayed voltage value is the same as the set voltage value, and to check if the VFD displayed current value is nearly zero.

4. Ensure that the voltage can be adjusted from zero to the full rated value.

1.2.2 Current Output Checkout

The following steps check basic current functions with a short across the power supply’s output.

1. Turn on the power supply.

2. Disable the output

Press key to ensure that the output is disabled. The ON annunciator is turned off.

3. Connect a short across (+) and (-) output terminals with an insulated test lead.

Use a wire size sufficient to handle the maximum current.

4. Enable the output.

Press key to ensure that the output is enabled. The ON annunciator is turned on.

5. Adjust the voltage value to 1.0 volt.

Adjust the voltage to 1.0 volt to ensure the power supply is in CC operation mode. The CC annunciator will turn on.

6. Adjust the current value.

Set some different voltage values, then wait till the Meter mode to check if the VFD displayed current

value is the same as the set voltage value, and to check if the VFD displayed voltage value is nearly

Warning: To satisfy safety requirements, load wires must be heavy enough not to

overheat when carrying the maximum short-circuit output current of the power supply. If there is more than one load, then any pair of load wires must be capable of safety carrying the full-rated current of the power supply.

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 6 for instructions on returning the instrument to the supplier for service.

1. Verify that there is AC power to the power supply.

First, verify that the power cord is firmly plugged into the power receptacle on the rear panel of the power supply. You should also make sure that the power source you plugged the power supply into is energized. Then, verify that the power supply is turned on.

2. Verify the power-line voltage setting.

The line voltage is set to the proper value for your country (110VAC or 220VAC. Change the voltage setting if it’s not correct.

3. Verify that the correct power-line fuse is installed.

If the fuse was damaged, please see the table below to replace the fuse for your power supply.

Fuse Description

Fuse 2.5A T 250V for 220VAC Fuse 5A T 250V for 110VAC

1.4 To Adjust the Carrying Handle

To adjust the position, grasp the handle by the sides and pull outward. Then, rotate the handle to the desired position.

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. After removing the handle, you can use a screwdriver to remove the two plastic ears.

To rack mount a single instrument, order rack mount kit IT-E151

Side view of rack mounting a single instrument

Programmi

Resolution

Read

To rack mount two instruments side-by-side, order rack mount kit IT-E151, you

needn’t to use the front cover panel.

Dimension unit (mm)

2.1 Specifications

Parameter 1785B 1786B 1787B 1788

Output Ratings,

( 0 °C - 40 °C)

Load Regulation, ±(% of output+offset)

Voltage Current

LVP Voltage

Current

Chapter 2 Specifications

0 ~18V 0 ~32V 0 ~72V 0 ~32V 0 ~5A 0 ~3A 0~1.5A

0 ~19V 0 ~33V 0 ~73V 0 ~33V

0.01% + 3mV

Model 1788 = <

0.02% + 5mV

0.1% + 2mA

0~6A

Line Regulation, ±(% of output+offset)

back Resolution

Voltage Current

Voltage 10mV

Current

Voltage Current

Model 1788 = 0.05% + 120mV(=20V)

0.1% + 3mV

0.1% + 2mA

10mA

0.05% + 15mV(<20V)

0.1% + 15mA

Programming

Accuracy, 12months

(

Readback

12months

Tem

Read

@ 25 °C ± 5 °C)

(% of output+offset)

Voltage

Current

<0.05% + 10mV

<0.2%+10mA

Accuracy

(25 °C ± 5 °C)

±(% of output+offset)

Ripple (20Hz ~20MHz)

perature

oefficient,

(0 °C ~ 40 °C)

±(% of output+offset)

back

emperature,

Coefficient, ±(% of output+offset)

Voltage

Current

Voltage

Current 5mArms

Voltage

Current

Voltage

Current

<0.05%+15mV(<20V),

<0.05%+120mV(=20V)

<0.1%+15mA

=1mVrms/3mVp-p

<0.02%+5mV

<0.1%+5mA

<0.02%+15mV(<20V),

<0.02%+120mV(=20V)

<0.1%+15mA

2.2 Supplemental Characteristics

State Storage Memory

Sixteen (16) user-configurable stored states

Recommended Calibration Interval

1 year

AC Input Ratings (selectable via switch on the rear panel)

Option OP1: 220VAC ± 10%, 47 to 63 Hz Option OP2: 110 VAC ± 10%, 47 to 63 Hz

Maximum input power

350VA

Cooling

Fan cooled

Operating Temperature

32 to 104 °F (0 to 40 °C) for full rated output

Storage Temperature

-68 to 158 °F (-20 to 70 °C) for storage environment.

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

N.W G.W

Dimensions WxHxD*

10” x 4.16” x 15” (255.7mm x 105.7mm x 382.7mm)

12.3Lbs.

5.6Kg

14Lbs.

6.4Kg

14.8Lbs.

6.7Kg

16.5Lbs.

7.5Kg

14.8Lbs.

6.7Kg

16.5Lbs.

7.5Kg

14.8Lbs.

6.7Kg

16.5Lbs.

7.5Kg

(Unit: mm)

Chapter 3 Front-panel Operation

Out

on/off

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. This chapter describes in detail the use of the front-panel keys and shows how they are used to accomplish power supply operation.

This chapter is divided into the following sections:

• Front-Panel Operation Overview‚ on page 14

• Constant Voltage Operation‚ on page 15

• Constant Current Operation‚ on page 15

• Storing and Recalling Operating States‚ on page 15

• MENU operation, starting on page 16

3.1 Front-panel Operation Overview

The following section describes an overview of the front-panel keys before operating your power supply.

1. The power supply is shipped from the factory configured in the front-panel operation mode. At

power-on, the power supply is automatically set to operate in the front-panel operation mode. When in this mode, the front panel keys can be used.

2. When the power supply is in remote operation mode, you cannot use the front-panel. A change

between front-panel and remote operation modes will not result in any change in the output parameters. You can change the front-panel and remote operation modes by computer.

3. The power supply is in Meter mode when it is powered on, and the VFD will display the actual voltage

and current output value. And in this mode, if any non-functional key is pressed, the power supply will changed to Set mode, and the VFD will display the adjusted voltage and current value. In Set mode,

the set voltage value will flash, you can press ? and ? keys to adjust the voltage value. In Set

mode, the power supply will turn back to Meter mode if there is no any key is pressed for 3 seconds.

4. The output of the power supply can be enabled or disabled from the front panel by pressing

key. When the output is on, the ON annunciator will turn on.

5. The VFD display shows the present operating status of the power supply with annunciators. For

example, the power supply is operating in CV mode, and then the CV annunciator will turn on. If, the power supply is remotely controlled, the Rmt annunciator will also turn on, See ‘‘Display Annunciators’’.

3.2 Constant Voltage Operation

The constant voltage range is from 0V to the maximum voltage value of each model. It is very easy for

you to set the constant voltage output. You have 2 solutions to set the constant voltage value. Solution 1: Step1. Power on the Power Supply

Step2. Press the ? and ? keys to change the value

Solution 2: Step1. Power on the IT68xx instrument

V-Set

Enter

Save

Recall

Enter

I-

Set

0 0

Note:

Step2. Press key.

Step3. Use the numeric 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 0A 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

Step2. Press key

Step3. Use the numeric keys to or use ? and ? keys to change the current value

Step4. Press key to confirm the value

3.4 Saving and Recalling Operation

You can store up to 16 different output states in storage register locations (1 to 16). Each output state includes Constant voltage value, Constant current value and Maximum output voltage value. When shipped from factory, storage locations “1” through “16” are empty. You can recall the saved settings by Recall function.

Step1. After you setting an output state (CV value, CC value and Maximum voltage), press key.

Step2.Use the numeric keys to or ? and ? keys to select the memory location (the range

is 1 to 16) which you want to store in.

Step3. Press to confirm the memory location. Step4. Press key.

Step5. Use numeric keys to or ? and ? keys to select the states which you want to

recall.

Step6. Press key to confirm. Then the saved settings will come on.

1. If the function keys were locked by password, you need to enter the correct

password after you press function keys (V-set, I-set, Save, Recall and Menu), then you can do the settings.

2. If you want to cancel a function operation (V-set, I-set, Save, Recall or Menu), just

press key to exit.

Esc

3.5 Menu Operation

n Set Maximum voltage(>MAX VOLT)

Please be well known that the Max voltage value should be in the range of each type of IT68xx

Power supply.

Step1. Press key.

Step2. Select >MAX VOLT by using? and ? key.

Enter

Step3. Press key.

Step4. Change the voltage value by using numeric keys to or ? and ? key.

Step5. Press key.

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.

n Initiating the Output state(>INIT OUT)

This instruction can initiate the output state when the power supply is powered on. If you select ON,

the power supply will initiate the output to OFF state when the power supply is powered on. If you select OFF, the output will remain the same state as last time you turned off the power supply

Note: Default selection is ON and the output state is always OFF state.

n Initiating the Output Voltage (>INIT VOLT)

This instruction can set the initial output voltage. If you select ON, the power supply will initiate the output voltage to 0Volt when the power supply is powered on. If you select OFF, the output voltage

will remain as the same volts as the last time you turned off the power supply

Note: Default setting is ON and the output voltage is 0 volt.

n Setting the Key Sound(>KEY SOUND)

This instruction can switch on/off the buzzing sound when you press any key, If you select ON, the buzzer will sound when any key was pressed. If you select OFF, the buzzer will not sound when the keys were pressed.

Note: Default setting is ON; the buzzer will sound when you press any key.

n Setting the Baud Rate(>BAUDRATE)

This instruction can change the communication baud rate for the power supply, the baud rate range is 4800, 9600, 19200 or 38400? Before the communication, you must make sure that there is same baud rate between the power supply and the computer.

Note: Default baud rate is 4800.

Note:

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. When the power supply receives a frame instruction from

computer, the LINK indicator will light on; it means that the power supply started to communicate with computer. If the power supply hasn’t received the signal from computer for 3 seconds, the LINK indicator will be turned off and it means that the power supply can not communicate with computer.

n Setting password for function keys(>KEY LOCK)

This instruction can set a password (1 through 4 digits) to lock the function keys operation. After

setting the password, all the function keys on the front panel will be locked except the OUT on/off key. You must enter the correct password to unlock them, then you can continue to do the function key operation. If you don’t want to lock the function keys, please don’t press any number key when you enter the >KEY LOCK instruction, just press ENTER key to unlock it.

unlocked. The start bit of your desired password shouldn’t be 0.

When shipped from factory, there is no password and function keys are

Chapter 4 Remote Operation Mode

Note:

The DB9 interface connector 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.

4.1 IT-E131 Communicati on cable

The DB9 interface connector on the rear panel of power supply is TTL voltage level; you can use the communication cable (IT-E131) to connect the DB9 interface connector of the power supply and the RS-232 interface connector of computer for the communication.

Computer side TTL? RS232 Cable (IT-E131) PS side

IT-E131 communication cable

Power

PC Load

COMPUTER

IT-E131 ISOLATED

COMMUNICATION CABLE

859666668889942311

TTL(5V)RS232 ISOLATION

INSTRUMENT

supply

It will not work if you connect the DB9 interface connector of the power supply to the RS232 interface connector of computer directly by a standard RS232 cable. Please use IT-E131 to connect them.

4.2 Communication setting

Before using the remote operation mode, please make sure that the baud rate and communication address in power supply are the same as in the computer software, otherwise, the communication will fail, you can change the baud rate and communication address from the front panel or from computer.

1. Address: the range is from 0 to 254, default setting is 0

2. Baud rate: 4800,9600,19200 and 38400 are selectable, default setting is 9600

3. Data bit: 8 bit

4. Stop bit: 1

5. Parity: None

PARITY = NONE

Start

Bit

8 Data Bits

Stop

Bit

4.3 Frame format

Note

When the power supply is in calibration mode, it is not allowed to change the output

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. Command occupies a byte.

a. 20H----Setting the remote control mode b. 21H----Setting the output ON/OFF state c. 22H----Setting the maximum output voltage d. 23H----Setting the output voltage e. 24H----Setting the output current f. 25H----Setting the communication address g. 26H----Reading the present current/voltage, maximum voltage, setup voltage/current and

operation states of the power supply. h. 27H----Enter the calibration mode i. 28H----Reading the calibration mode state j. 29H----Calibrate voltage value. k. 2AH----Sending the actual output voltage to calibration program. l. 2BH----Calibrate current value. m. 2CH----Sending the actual output current to calibration program. n. 2DH----Save the calibration data to EEPROM. o. 2EH----Setting calibration information. p. 2FH----Reading calibration information. q. 31H----Reading product’s model, series number and version information. r. 32H----Restoring the factory default calibration data. s. 37H----Enable the local key. t. 12H---- The return information of command operation in power supply.

: You must change the power supply to remote control mode firstly, then you can

control the power supply output by computer. The command for remote control is 20H?

If you want to calibrate the power supply, set the calibration information or want to set the product serial number, you must set the calibration protection mode to OFF state firstly, the command for calibration protection is 27H.

4. 4th to 25th bytes are information content

5. 26th byte is check sum, the sum of the former 25 bytes.

4.4 Communication protocol

1. Setting the remote control mode (20H)

1st byte Start bit( AAH ) 2nd byte Address(0~0XFE)

3rd byte

Note:

Note: You can not control the power supply from the front panel when

4th byte Operation mode(0 represent front panel operation mode, 1 5th to 25th byte System reserve

26th byte Check sum

Command ( 20H)

represent remote operation mode)

the power supply is in calibration mode.

2. Setting the output state ON/OFF (21H)

1st byte Start bit (AAH ) 2nd byte Address(0~0XFE) 3rd byte Command (21H) 4th byte 5th to 25th byte System reserve

26th byte Check sum

Output state(0 is OFF, 1 is ON)

3. Setting the maximum output voltage (22H)

1st byte Start bit (AAH ) 2nd byte Address(0~0XFE) 3rd byte Command (21H) 4th byte The lowest byte of voltage upper limit

5th byte The lower byte of voltage upper limit 6th byte The higher byte of voltage upper limit 7th byte The highest byte of voltage upper limit

8th to 25th byte System reserve 26th byte Check sum

We use 4 bytes of Hex number to represent a maximum voltage value. For

example the maximum voltage is 16.000V, the hex code of 16.000 is 0X00003EB0, so the 4th byte is 0XB0, 5th bye is 0X3E, 6th byte is 0X00, 7th byte is 0X00.

4. Setting the output voltage (23H)

1st byte Start bit ( AAH ) 2nd byte Address(0~0XFE) 3rd byte 4th byte The byte 0 of output voltage value 5th byte The byte 1 of output voltage value

6th byte The higher byte of output voltage value

Command( 23H)

7th byte The highest byte of output voltage value

Note:

8th to 25th byte System reserve 26th byte Check sum

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 4th byte is 0XB0, 5th byte is 0X3E, 6th byte is 0X00, 7th byte is 0X00.

5. Setting the output current (24H)

1st byte Start bit ( AAH ) 2nd byte Address (0~0XFE)

3rd byte 4th byte To set the low byte of current value

5th byte To set the high byte of current value 6th to 25th byte System reserve

26th byte Check sum

Command( 24H)

We use 2 bytes of Hex number to represent an output current value. For

example the output current value is 1.000A, the hex code of 1.000 is 0X03E8, so the 4th byte is 0XE8, 5th bye is 0XE3.

6. Setting the communication address (25H)

1st byte Start bit ( AAH ) 2nd byte The current address of power supply(0~0XFE) 3rd byte Command(25H) 4th byte The new address 5th to 25th byte System reserve

26th byte Check sum

7. Reading the present current/voltage, maximum voltage, setup voltage/current and the states of power supply. (26H)

1st byte Start bit ( AAH ) 2nd byte Address(0~0XFE)

3rd byte 4th byte Byte 0 of present output current value 5th byte Byte 1 of present output current value 6th byte Byte 0 of present output voltage value

7th byte Byte 1 of present output voltage

Command( 26H)

8th byte Byte 2 of present output voltage 9th byte Byte 3 of present output voltage 10th byte Power supply’s state

11th byte To set the low byte of current value

Note:

12th byte To set the high byte of current value 13th byte Byte 0 of the maximum voltage value

14th byte Byte 1 of the maximum voltage value 15th byte Byte 2 of the maximum voltage value 16th byte Byte 3 of the maximum voltage value

17th byte Byte 0 of output voltage value 18th byte Byte 1 of output voltage value 19th byte Byte 2 of output voltage value 20th byte Byte 3 of output voltage value 21st to 25th byte System reserve 26th byte Check sum

1. We use 4 bytes to represent the maximum voltage value as follows: Byte 3 Byte 2 Byte1 Byte

2. We use 1 byte to represent power supply’s state. Each bit is defined as follows:

From higher bit to lower bit

7 6 5 4 3 2 1 0

0 bit: The output state, 0 is OFF, 1 is ON. 1 bit: Over heat protection, 0 is normal, 1 is abnormal. 2? 3 bit: The output mode, 1 is CV mode, 2 is CC mode,3 is Unreg mode. 4? 5? 6 bit: The fan speed, 0 is stop, 5 is the maximum fan speed.

7 bit: Operation state, 0 is front panel operation mode, 1 is remote control

8. Entering the calibration mode( 27H)

3. The frame format is the same as above

byte Start bit(AAH) 2nd byte Address(0~0XFE) 3rd byte Command(27H)

4th byte Calibration protection state 5th byte Calibration password(0X28H)

6th byte Calibration password(0X01H) 7th to 25th byte System reserve

26th byte Check sum

mode.

We use a byte to represent calibration protection state, each bit is defined as

follows:

from higher bit to lower bit

7 6 5 4 3 2 1 0

0 bit: Protection state, 0 is to disable protection, 1 is to enable the protection.

9. Reading the calibration state (28H)

1st byte Start bit(AAH)

Note:

2nd byte Address(0~0XFE) 3rd byte Command(28H) 4th byte Calibration protection state 5th byte System reserve

26th byte Check sum

10. Calibrating the voltage value (29H)

1st byte Start bit(AAH) 2nd byte Address(0~0XFE) 3rd byte Command(29H)

4th byte Calibrated voltage points(point 1-3) 5th to 25th byte System reserve 26th byte Check sum

To calibrate the 3 points of voltage sequentially.

11. Sending the present output voltage to calibration program (2AH)

1st byte Start bit (AAH) 2nd byte Address(0~0XFE)

3rd byte Command(2AH) 4th byte The byte 0 of present voltage value 5th byte The byte 1 of present voltage value 6th byte The byte 2 of present voltage value 7th byte The byte 3 of present voltage value

8th to 25th byte System reserve 26th byte Check sum

12. Calibrate the current value (2BH)

1st byte Start bit(AAH) 2nd byte Address(0-0XFE) 3rd byte Command(2BH) 4th byte Calibrated current points( point 1-2)

5th to 25th byte System reserve 26th byte Check sum

Note: To calibrate the 2 points of the current value sequentially.

13. Sending the actual output current to calibration program (2CH)

1st byte Start bit (AAH) 2nd byte Address(0~0XFE) 3rd byte Command(2CH)

4th byte The lower byte of the present current value 5th byte The higher byte of the present current value

6th to 25th byte System reserve 26th byte Check sum

14. Save the calibration data to EEPROM( 2DH)

1st byte Start bit(AAH) 2nd byte Address (0~0XFE)

3rd byte Command(2DH) 4th to 25th byte System reserve

26th byte Check sum

15. Setting calibration information (2EH)

1st byte Start bit (AAH) 2nd byte Address (0~0XFE) 3rd byte Command(2EH) 4th to 23rd byte Calibration information(ASIC code) 24th byte System reserve 25th byte System reserve 26th byte Check sum

16. Reading calibration information (2FH)

1st byte Start bit (AAH) 2nd byte Address (0~0XFE) 3rd byte

4th to 23rd byte Calibration information(ASCII code) 24th byte System reserve 25th byte System reserve 26th byte Check sum

Command( 2FH)

17. Reading product’s model, series number and version information (31H)

1st byte Start bit (AAH)

2nd byte Address (0~0XFE)

Note:

and all local keys will work.

3rd byte 4th to 8th byte Product model(ASIC code) 9th byte Lower byte of the software version 10th byte Higher byte of the software version

11th to 20th byte Serial number(ASCII code) 21st to 25th byte System reserve

26th byte Check sum

Command( 31H)

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:

AA 00 31 36 38 31 31 00 03 02 ZZ ZZ ZZ ZZ ZZ ZZ ZZ ZZ ZZ ZZ XX XX XX XX XX 57

18. Restore the factory default calibration data (32H)

1st byte Start bit (AAH) 2nd byte Address(0~0XFE)

3rd byte Command(32H) 4th to 25th byte System reserve

26th byte Check sum

19. Enable the local key (37H)

1st byte Start bit ( AAH) 2nd byte Address (0-0XFE)

3rd byte Command (37H) 4th byte Enable/disable local key (0 is disable, 1is enable)

5th to 25th byte System reserve 26th byte Check sum code

The local keys on the front panel are not allowed to use when the power

supply is in remote mode. If the local key was enabled, user can press the numeric key 7 to change the remote mode to front panel operation mode

20. The return information of command operation in power supply (12H)

1st byte Start bit (AAH) 2nd byte Address (0~0XFE) 3rd byte Command(12H)

4th byte Command checkout result 5th to 25th byte System reserve

26th 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. Or otherwise, it will return to 80H.

Chapter 5 Calibration

We suggest you to calibrate the power supply yearly. We provide you a set of calibration software Power Calibration (PC1785B_1788). It is very easy to calibrate the power supply by the calibration software. Please make the following preparation before the calibration.

1. Please prepare a high accuracy multi-meter (the accuracy should be higher than the power supply). Prepare to use the multi-meter to measure the output voltage and short circuit current of the calibrated power supply.

2. Use IT-E131 communication cable to connect the DB9 interface connector of the power supply and

the RS232 interface connector of the computer.

3. Install the PC1785B_1788 calibration software on your computer, and start the software.

After doing the above preparation, then you can calibrate the power supply easily by the software step by step. Please refer the following calibration process.

5.1 Configuration

Start the PC1785B_1788 System, the windows is as follows:

Voltage calibration

Current calibration

The diagram of connecting the multimeter 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. Please make sure that the baud rate and

address in the software and in power supply are the same.

5.2 Voltage calibration

Step 1: Prepare to use multi-meter to measure the output voltage, and connect the voltage meter to the

power supply according to the diagram in the above windows.

Step 2: Click “Linked” button. It will go into Calibration mode, the Rmt and Cal indicators will light up. Step 3: Fill the first voltage value you measured from the multi-meter to the blank of “0.000V”, and

click “OK” button to confirm the value.

Step 4: Fill the second voltage value you measured from the multi-meter to the blank of “0.000V”, and

click “OK” button to confirm the value.

Step 5: Fill the third voltage value you measured from the multi-meter to the blank of “0.000V”, and

click “OK” button to confirm the value.

5.3 Current calibration

Step 1: Prepare to use multi-meter to measure the short circuit current, and connect the current meter to

the power supply according to the diagram in the above windows.

Step 2: Click “Linked” button, it will go into Calibration mode, the Rmt and Cal indicators will light up. Step 3: Fill the first current value you measured from the multi-meter to the blank of “0.000A”, and click

“OK” button to confirm the value.

Step 4: Fill the second current value you measured from the multi-meter to the blank of “0.000A”, and

click “OK” button to confirm the value.

5.4 Finish calibrating

When you measure the output voltage or short current by the multi-meter, 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 would damage the multi-meter.

5.4 Reset to the default calibration settings

In the calibration process, if there is any failure caused by the misreading the voltage value and current value or any other reason, you can use the “Restore” to let the power supply return to the state before calibrating.

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. This software can accomplish all the functions of the power supply, such as setting constant voltage, setting constant current, max voltage etc. Also you can make quickly settings or make a program for the output voltage and current by the computer. In addition, PV1785B_1788 offer a GO/NG test function for automatic factory testing .It brings you much convenient when you use the power supply.

6.2 Installation

1. Requirements for the computer

Pentium III or Pentium IV processor-based personal computer Windows 98/2000/XP or Windows NT4.0

2. Insert the CD-Rom which supplied with the instrument to the CD driver, and install the software step

by step according to the instructions. The software PV1785B_1788 and PC1785B_1788 will be installed on your computer at the same time.

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.

To set the output state ON/OFF. To enable the local numeric key , it means that if you select “Enable” on this button, when the

power supply is under remote control mode, you can press numeric key to change the control mode to front panel control mode.

Annunciators display.

Status bar, it can show you the power supply model, communication status and operation status.

To set current value, use the rotary knob to set the current value, the setup value and

measurement value will be displayed.

To make a program of voltage and current values for the power supply, or to set the output value

quickly.

Using the rotary knob to set the voltage value, the setup value and present value will be displayed

in the 2 indicators.

6 7

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) Max voltage: to set a maximum voltage value in the voltage range. For example, the voltage range of IT6822 is 0~32V, then you can set a maximum voltage at 24V.

3) Voltage step: to set the step size of Arrow key, page up/down key, and Mouse-wheel. When you set the value by clicking the knob, you can use the arrow keys (?, ?, ?, ?), page up/down keys or mouse wheel to adjust the value more slightly.

4) Reload last parameter: if you select it, then it will reload

Note: When you set the communication port, please make sure that the baud rate and

address of the computer are the same as the power supply.

the parameter settings of last time you close this software.

6.3.2 Status bar

Status bar will give you the communication information. When the communication is successful, the status bar will display as follows:

1. Model number, it will display the real part number of the field power supply which detected by the computer. (6811/6812/6821/6822/6823……..).

2. Operation status (Operation correct/Check error), if Check error appears here, it means that there is check error for your last operation command.

3. Communication status (Communication successful/Communication waiting), if Communication waiting appears here for more than 10 seconds, you need to check if there is any connection failure between computer and power supply. After confirming the effective connection, then re-configure the baud rate, address, comport etc, to make sure the same baud rate and address between power supply and computer.

Communication status Operation status Model number

6.3.3 Setting Voltage and current

indicator.

Voltage

Sweep

Hot Key

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. The setup value will be displayed on the second line indicator.

Use mouse to click on the rotary knob and move mouse to change the value. Also you can use mouse wheel, Page Up/Down keys and arrow keys (?, ?, ?, ?) from the keyboard to change the current value more slightly. The setup value will be displayed on the second line

Note: Before you set the current and voltage value from the computer, please change the

operation mode to PC Control mode by pressing button.

2. Quickly setting

: Right-click each Hotkey Button, it will display as

“Modify Voltage/Current”. Click “Modify/Voltage/ Current”, it will display as follows, change the voltage/current value as you desired, then click OK button to confirm.

StartValue=0.0V, Stop Value=10V, Voltage Step=2V, TimeDelay=2s. When you click the Run button, the voltage will change according to the voltage sweep setup value, then you can click Stop button to stop the voltage sweep. You can also click the Chart button, the voltage chart will display as follows:

To set voltage sweep. For example,

Program:

ode includes Once, Repeat and Custom).

3. Program setting

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. Also you can change the time unit (hour/minute/second) by clicking on “Sec”.

After programming, you can select a run mode for your program. (Run m

Click “Run” button to send the program settings to the power supply. The power supply’s output will respond to the program.

Click “Stop” button to stop sending the program settings to the power supply. The power supply state will return to the state before the program running.

Click “Chart” to show the voltage and current chart of the program. You can do some analysis on the chart or print the chart. The chart is as follows:

6.3.4. GO/NG Test Function

GO/NG is an auto test function, to test if the EUT (equipment under test) can meet the specification. To use this function, follow up the steps below:

1. Right-click on the window, the edit tools (Append a line, Insert a line, Delete a line, Delete Select etc.) will appear on the window. Use the edit tools to edit the test steps.

2. To set the Voltage, Max Amps, Min Amps and Delay

time according to the specifications of the EUT.

3. Click the Run button to start the test. If the Real Amps of all steps are in the range of Min Amps to Max Amps, then the EUT will pass the test, the Pass window will appear.

4. If there is a Real Amps beyond the range in any step, the EUT will not pass the test.

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 display as more details.

Double click the current chart, the current chart will be enlarged and will display with more details.

6.3.7. Chart Description

The voltage and current chart can help you to analyze voltage and current changes more easily.

We take the voltage chart as the example to let you know how to use it. The chart window is as follows:

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 Y-Axes Span

To set the X-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 Zoom in Save the chart as a .BMP file. Clear all data Resume tracking Auto scale Print the chart Zoom rectangle

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. Returned product must be accompanied by proof of the purchase date in the form a sales receipt.

To obtain warranty coverage in the U.S.A., this product must be registered by completing and mailing the enclosed warranty card to B&K Precision Corp., 22820 Savi Ranch Parkway, Yorba Linda, CA 92887 within fifteen (15) days from proof of purchase.

Exclusions: This warranty does not apply in the event of misuse or abuse of the product or as a result of unauthorized alternations or repairs. It is void if the serial number is alternated, defaced or removed.

B&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 limitation 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.

Model Number: ______________ Date Purchased: __________

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Include with the instrument your complete return shipping address, contact name, phone number and description of problem.

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