B&K 1785B User Manual

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Instruction Manual

1

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

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-panelOperation...................................................................................................

15

3.1

Front-panelOperation 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 .........................................................................................................

 

2

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-hazardousvoltages, 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

3

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-outputprogrammable DC power supplies with communication interface. The combination ofbench-topand system features in these power supplies provides versatile solutions for your design and test requirements.

Convenient bench-topfeatures:

Nice appearance, small-sizeand 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

4

The Front Panel at a Glance

1

2

3

4

5

6

7

?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

5

Function keys description

V-set

Set the output voltage value

 

I-set

Set the current value

 

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

Menu description

Menu

 

 

 

 

 

 

>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

6

ON

Output ON

Link The power supply is in communication

Oh

Overheat protection state

 

mode

CV The power supply is in constant

Rmt The power supply is in remote mode

 

voltage mode.

Cal

The power supply is in calibration mode

CC The power supply is in constant

 

The function keys are locked by password

 

current mode.

 

 

 

 

Unreg The output of the power supply

 

The rotate speed of cooling fan

 

is unregulated (neither CV nor CC)

 

 

 

 

 

 

 

 

The Rear Panel at a Glance

1

2

3

4

5

?Cooling window

?DB9 interface connector

?110V/220V selector

?Fuse

?Power socket

7

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-paneloperations.

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-paneldisplay will light up briefly while the power supply performs itspower-onself-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:

ERR EEPROM

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

ERROR CAL

Warning: Your power supply is equipped with a3-wiregrounding type power cord; the third conductor being the ground. The power supply is grounded only when thepower-linecord is plugged into an appropriate receptacle. Do not operate your power supply without adequate cabinet ground connection.

8

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 Out on/off key to let theON annunciator and theCV annunciator turn on to light.

Notice: if the voltage value flash, then the power supply is inSet mode, ‘‘Set mode’’ means that the VFD display shows the setting output voltage and current. Or the power supply is inMeter mode, ‘Meter mode” means that the VFD display shows the actual output voltage and current.

3. Check that the front-panelvoltmeter 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 Out on/off key to ensure that the output is disabled. TheON 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.

Warning: To satisfy safety requirements, load wires must be heavy enough not to overheat when carrying the maximumshort-circuitoutput current of the power supply. If there is more than one load, then any pair of load wires must be capable of safety carrying thefull-ratedcurrent of the power supply.

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

9

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-linevoltage 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-linefuse 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.

10

Bench-topviewing positions

Carrying position

1.5 To Rack Mount the Instrument

You can mount the power supply in a standard 19-inchrack cabinet using theIT-E151rack mount kit.

Note: Remove the carrying handle and the two plastic ears beforerack-mountingthe 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

11

To rack mount two instruments side-by-side,order rack mount kitIT-E151,you needn’t to use the front cover panel.

Dimension

unit (mm)

Chapter 2 Specifications

2.1 Specifications

Parameter

 

 

1785B

 

 

1786B

 

1787B

 

1788

Output Ratings,

Voltage

 

0 ~18V

 

 

0 ~32V

 

0 ~72V

 

0 ~32V

Current

 

0 ~5A

 

 

0 ~3A

 

0~1.5V

 

0~6A

( 0 °C - 40 °C)

 

 

 

 

 

 

LVP

 

0 ~19V

 

 

0 ~33V

 

0 ~73V

 

0 ~33V

 

 

 

 

 

 

 

 

 

 

 

 

Load Regulation,

Voltage

 

 

 

 

 

<0.01% + 3mV

 

 

Model 1788 = <0.02% + 5mV

 

 

±(% of output+offset)

 

 

 

 

 

 

 

 

 

 

 

 

Current

 

 

 

 

 

<0.1% + 2mA

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Line Regulation,

Voltage

 

 

 

 

 

<0.1% + 3mV

 

 

 

 

 

 

 

 

 

 

 

 

 

±(% of output+offset)

Current

 

 

 

 

 

<0.1% + 2mA

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Programming

Voltage

 

 

 

 

 

 

10mV

 

 

 

 

 

 

 

 

 

 

 

 

 

Resolution

Current

 

 

 

 

 

 

10mA

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Voltage

 

 

0.05% + 15mV(<20V)

 

Readback Resolution

 

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

 

 

Current

 

 

 

 

 

< 0.1% + 15mA

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

12

Programming

Voltage

<0.05%+ 10mV

 

 

Accuracy, 12months,

 

 

(@ 25 °C ± 5 °C)

 

 

±(% of output+offset)

Current

<0.2% +10mA

 

 

 

 

Readback Accuracy

Voltage

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

<0.05%+120mV(20V)=

 

12months,

 

 

(25 °C ± 5 °C)

 

 

 

 

±(% of output+offset)

Current

<0.1% +15mA

 

 

 

 

Ripple

Voltage

1mVrms/3mVp= -p

 

 

(20Hz ~20MHz)

Current

5mArms

 

 

 

 

Temperature

Voltage

<0.02%+5mV

 

 

Coefficient,

 

 

(0 °C ~ 40 °C)

 

 

±(% of output+offset)

Current

<0.1% +5mA

 

 

 

 

Readback

Voltage

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

<0.02%+120mV(20V)=

 

Yemperature,

 

 

Coefficient,

 

 

 

 

±(% of output+offset)

Current

<0.1% +15mA

 

 

 

 

2.2 Supplemental Characteristics

State Storage Memory

Sixteen (16) user-configurablestored 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

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

13

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

 

12.3Lbs.

 

14.8Lbs.

 

14.8Lbs.

 

14.8Lbs.

 

 

5.6Kg

 

6.7Kg

 

6.7Kg

 

6.7Kg

 

 

 

 

 

 

 

G.W

 

14Lbs.

 

16.5Lbs.

 

16.5Lbs.

 

16.5Lbs.

 

 

6.4Kg

 

7.5Kg

 

7.5Kg

 

7.5Kg

 

 

 

 

 

 

Dimensions WxHxD*

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

(Unit: mm)

14

Chapter 3 Front-panelOperation

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-panelkeys and shows how they are used to accomplish power supply operation.

This chapter is divided into the following sections:

Front-PanelOperation 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-panelOperation Overview

The following section describes an overview of the front-panelkeys before operating your power supply. 1. The power supply is shipped from the factory configured in thefront-paneloperation mode. At

power-on,the power supply is automatically set to operate in thefront-paneloperation 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 betweenfront-paneland remote operation modes will not result in any change in the output parameters. You can change thefront-paneland 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 anynon-functionalkey is pressed, the power supply will changed toSet mode, and the VFD will display the adjusted voltage and current value. InSet 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 toMeter 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 Out on/off key. When the output is on, theON 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, theRmt 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

15

Step2. Press

V-Set

key.

 

Step3. Use the numeric keys 0 to

9 or? and? keys to change the voltage value.

Step4. Press

Enter

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 I-Set key

Step3. Use the numeric keys 0 to9 or use? and? keys to change the current value Step4. PressEnter 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 Save key. Step2.Use the numeric keys0 to9 or? and? keys to select the memory location (the range

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

Step3. Press

Enter

to confirm the memory location.

Step4. Press

Recall

key.

Step5. Use numeric keys 0 to9 or? and? keys to select the states which you want to recall.

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

Note: 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 Esc key to exit.

3.5 Menu Operation

nSet 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 Menu key.

16

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

Step3. Press Enter key.

Step4. Change the voltage value by using numeric keys 0 to9 or? and? key. Step5. PressEnter 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.

nInitiating 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.

nInitiating 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.

nSetting 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.

nSetting 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.

17

nSetting 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.

nSetting 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 pressENTER key to unlock it.

Note: When shipped from factory, there is no password and function keys are unlocked.The start bit of your desired password shouldn’t be 0.

18

Chapter 4 Remote Operation Mode

The DB9 interface connector on the rear panel of the power supply can be transferred toRS-232interface, the following information will tell you how to use the computer to control the output of the power supply.

4.1 IT-E131Communication 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 theRS-232interface connector of computer for the communication.

Computer side

TTL? RS232 Cable (IT-E131)

PS side

IT-E131communication cable

PC

PC

COMPUTER

IT

IT-E131ISOLATED

 

 

COMMUNICATION CABLE

RX

 

 

 

RS232

ISOLATION

TTL(5V)

 

 

 

 

TX

859666668889942311

 

 

Power

supplyLoad

INSTRUMENT

Note: 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 useIT-E131to 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

 

8 Data Bits

 

Stop

Bit

 

 

Bit

 

 

 

 

 

19

4.3 Frame format

Frame length is 26 bytes, the format is as follows:

Start

 

Address

Command

 

4-25bytes 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----Settingthe remote control mode

 

b. 21H----Settingthe output ON/OFF state

 

c.

22H----Settingthe maximum output voltage

 

d. 23H----Settingthe output voltage

 

e. 24H----Settingthe output current

 

f.

25H----Settingthe communication address

 

g. 26H----Reading

the present

current/voltage, maximum voltage, setup voltage/current and

 

operation states of the power supply.

 

h. 27H----Enterthe calibration mode

 

i.

28H----Readingthe calibration mode state

 

j.

29H----Calibratevoltage value.

 

k.

2AH----Sendingthe actual output voltage to calibration program.

 

l.

2BH----Calibratecurrent value.

 

m.2CH----Sendingthe actual output current to calibration program.

n.2DH----Savethe calibration data to EEPROM.

o.2EH----Settingcalibration information.

p.2FH----Readingcalibration information.

q.31H----Readingproduct’s model, series number and version information.

r.32H----Restoringthe factory default calibration data.

s.37H----Enablethe local key.

t.12H----The return information of command operation in power supply.

Note: 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.

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

4.4th to 25th bytes are information content

5.26th byte is check sum, the sum of the former 25 bytes.

4.4Communication protocol

1. Setting the remote control mode(20H)

1st byte

Start bit( AAH )

 

 

2nd byte

Address(0~0XFE)

20

3rd byte

Command ( 20H)

4th byte

Operation mode(0 represent front panel operation mode, 1

 

represent remote operation mode)

5th to 25th byte

System reserve

26th byte

Check sum

 

 

 

 

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

Output state(0 is OFF, 1 is ON)

5th to 25th byte

System reserve

26th byte

Check sum

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

Note: 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

Command( 23H)

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

21

7th byte

The highest byte of output voltage value

8th to 25th byte

System reserve

26th 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 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

Command( 24H)

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

 

 

Note: 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

Command( 26H)

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

 

 

8th byte

Byte 2 of present output voltage

9th byte

Byte 3 of present output voltage

10th byte

Power supply’s state

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11th byte

To set the low byte of current value

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

Note:

1. We use 4 bytes to represent the maximum voltage value as follows:

Byte 3 Byte 2 Byte1 Byte

0

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)

 

 

 

mode.

 

 

3. The frame format is the same as above

 

 

1st 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

 

Note:

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)

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1st byte

Start bit(AAH)

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

 

 

Note: 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

 

 

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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

Command( 2FH)

4th to 23rd byte

Calibration information(ASCII code)

24th byte

System reserve

25th byte

System reserve

26th byte

Check sum

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

1st byte

Start bit (AAH)

25

2nd byte

Address (0~0XFE)

3rd byte

Command( 31H)

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

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

Note: 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 and all local keys will work.

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

26

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 themulti-meterto measure the output voltage and short circuit current of the calibrated power supply.

2.Use IT-E131communication 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.

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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

The diagram of connecting the multi-

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. 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 usemulti-meterto 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 themulti-meterto the blank of “0.000V”, and

click “OK” button to confirm the value.

Step 4: Fill the second voltage value you measured from themulti-meterto the blank of “0.000V”, and click “OK” button to confirm the value.

Step 5: Fill the third voltage value you measured from themulti-meterto the blank of “0.000V”, and click “OK” button to confirm the value.

5.3 Current calibration

Step 1: Prepare to usemulti-meterto 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 themulti-meterto the blank of “0.000A”, and click

“OK” button to confirm the value.

Step 4: Fill the second current value you measured from themulti-meterto the blank of “0.000A”, and click “OK” button to confirm the value.

5.4 Finish calibrating

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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-meteris higher than the maximum current of the calibrated power supply, otherwise it would damage themulti-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-outputpower supply models. Please make sure that you purchasedIT-E131communication cable, and useIT-E131to 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-basedpersonal computer Windows 98/2000/XP or Windows NT4.0

2.Insert the CD-Romwhich 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.

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6.3 Functions of PV1785B_1788

Start the software PV1785B_1788, the windows is as follows:

1

2

3

4

 

5

6

7

8

1

Configure the software operation environments.

 

2

Voltage chart, it can show you a chart of the voltage.

3

Current chart: it can show you a chart of the current.

4

To set the remote mode of power supply.

 

5

To set the output state ON/OFF.

 

 

11

10

9

6 To enable the local numeric key7 , it means that if you select “Enable” on this button, when the

power supply is under remote control mode, you can press numeric key

7

to change the

control mode to front panel control mode.

 

 

7

8

Annunciators display.

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

9 To set current value, use the rotary knob to set the current value, the setup value and measurement value will be displayed.

10To make a program of voltage and current values for the power supply, or to set the output value quickly.

11Using the rotary knob to set the voltage value, the setup value and present value will be displayed in the 2 indicators.

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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 the parameter settings of last time you close this software.

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.

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:

 

 

 

 

 

 

 

 

 

 

 

 

Model number

 

 

Operation status

 

Communication status

 

 

 

 

 

 

 

 

 

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), ifCheck error appears here, it means that there is check error for your last operation command.

3.Communication status (Communication successful/Communication waiting),if Communication waitingappears 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.

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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. 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 indicator.

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

Hot Key:Right-clickeach 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.

Voltage Sweep: To set voltage sweep. For example, 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:

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3. Program setting

Program: Right-clickon 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-clickon 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 mode includes Once, Repeat and Custom).

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-clickon 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.

33

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:

34

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-AxesSpan

To set the Y-AxesSpan

 

 

 

 

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

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Limited One-YearWarranty

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: __________

22820 Savi Ranch Parkway Yorba Linda, CA 92887 714.921.9095

714.921.6422 Facsimile

36

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. Clearly state in writing the performance problem and return any leads, connectors and accessories that you are using with the device. Customers not on open account must include payment in the form of a money order or credit card. For the most current repair charges contact the factory before shipping the product.

Return all merchandise to B&K Precision Corp. with pre-paidshipping. Theflat-raterepair charge includes return shipping to locations in North America. For overnight shipments andnon-NorthAmerica shipping fees contact B&K Precision Corp..

B&K Precision Corp. 22820 Savi Ranch Parkway Yorba Linda, CA 92887 Phone: 714- 921-9095Facsimile:714-921-6422

Email: service@bkprecision.com

Include with the instrument your complete return shipping address, contact name, phone number and

description of problem.

37

 

22820 Savi Ranch Parkway

 

Yorba Linda, CA 92887

 

USA

PN: 481-534-9-001

TEL: 714-921-9095

FAX: 714-921-6422

Printed in China

 

©2005 B&K Precision Corp.

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