B&K Precision 1785B User Manual

Instruction Manual

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

Content

Content ..................................................................................................................................................... 2

Quick Reference ............................................................................................................................................. 3

About your safety.................................................................................................................................... 3

General information ........................................................................................................................ 3

Protection from electric shock ...................................................................................................... 3

Definition of users ........................................................................................................................... 3

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

Certification...................................................................................................................................... 4

Introduction .............................................................................................................................................. 4

The Front Panel at a Glance................................................................................................................. 5

Function keys description ...................................................................................................................... 5

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 .............................................................................................................................. 8

1.2.1 V oltage Output Checkout .................................................................................................... 9

1.2.2 Current Output Check out .................................................................................................... 9

1.3 If the Power Supply Does N ot Turn On ...................................................................................... 10

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

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

Chapter 2 Specifications.............................................................................................................................. 13

2.1 Specifications ................................................................................................................................. 13

2.2 Supplemental Character istics ...................................................................................................... 14

Chapter 3 Front-pan el O peration ............................................................................................................... 16

3.1 Front-panel Operation Overview ................................................................................................. 16

3.2 Constant Voltage Operation ......................................................................................................... 16

3.3 Constant Current O peration ......................................................................................................... 17

3.4 Saving and Recalling Operation .................................................................................................. 17

3.5 Menu Operation ............................................................................................................................. 17

Chapter 4 Remote Operat ion Mode .......................................................................................................... 20

4.1 IT-E131 Comm unication cable ..................................................................................................... 20

4.2 Communication setti ng ................................................................................................................. 20

4.3 Frame format .................................................................................................................................. 21

Packet structure ............................................................................................................................ 21

Status packets ............................................................................................................................... 22

4.4 Communication protocol ............................................................................................................... 24

Chapter 5 PV1785B-1788 Software .......................................................................................................... 31

5.1 Introduction ..................................................................................................................................... 31

5.2 System Installati on......................................................................................................................... 31

5.3 Functions of PV-1785B-1788 ....................................................................................................... 31

5.3.1Configure the syst em .......................................................................................................... 32

5.3.2 Status bar ............................................................................................................................. 33

5.3.3 Setting Voltage and current ............................................................................................... 33

5.3.4. GO/NG Test Function........................................................................................................ 35

5.3.5 Save and Open ................................................................................................................... 35

5.3.6 Present Voltage/Current Chart ......................................................................................... 35

5.3.7 Chart Description ................................................................................................................ 36

Quick Reference

About your safety

Pease review the following safety precautions before operating our equipment.

General information

The following saf ety 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 instal lati on, o perati on, and m aint enanc e inf ormati on c aref ull y before usi ng the product. Refer to this manual for compl e te pr oduc t specifications. If the product is used in a manner not specified, the protection provided by the produc t may be impaired. Before performing any maintenance, disconnect the line cord and all test cables.

Protection from electric shock

Operators of this instrumen t must be pr otected 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 th e indi vi dual or g rou p re sponsi ble for the us e a nd main ten ance of equipment is operated within its specifications and operating limits, and for ensuring that operators are adeq uatel y 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 p ublis hed spec ificatio ns at time of shipment fr om 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 featur es in these power supplies provides versatile solutions for your design and test requirements.

Convenient bench-top feat ur es :

• 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

Set the output voltag e 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

V-set

I-set

Save

Recall

Out on/off

① 10 digits VFD display ② Status information for operating mode and working status ③ Power switch ④ Number keys ⑤ Function keys ⑥ UP/DOWN and ENTER key ⑦ Output terminals

Function keys description

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

>BAUD RATE

Set the communication baud rate

>ADDR

Set the communication address

>KEY LOCK

Set the password for function keys

>EXIT

Exit

OFF

The power supply’s output is off

Timer

Not used

Constant voltage mode

Sense

Not used

Constant current mode

Ext

Not used

Adrs

The instrument is communicating with an IT-E131/IT-E132/IT-E133

Meter

Meter mode

Rmt

The instrument is in remote state. The only active key is the Local KEY.

Shift

Not used

Error

The instrument has err or

OVP

Over voltage protect state

Prot

Not used

OCP

Over current protect state

Lock

The keyboard is locked by a password

Display annunciators

The Rear Panel at a Glance

① Cooling window ② DB9 interface connector ③ 110V/220V selector ④ Fuse ⑤ Power socket

Chapter 1 Quick Start

□ □ □

ERR EEPROM

ERROR CAL

Warning

supply without adequate cabine t g round connection.

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

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 dam aged or the latest op er ati on 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 groun d . The power supply is grounde d o n ly when the power-line cord is plugged into an app ropriate receptacle. Do not operate your power

: Your power supply is equipped with a 3-wire gro u n d ing type power cord;

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.

Warning：

Out on/off

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 and the ”Meter” annunciator is lit.

3. Check that the front-panel voltmeter prop er ly 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 OFF annunciator is turned on.

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

Use a wire size sufficient to handle the maximum current.

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.

4. Enable the output.

Press key to ensure that the output is enabled. The OFF annunciator is turned off.

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 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 zero.

7. Ensure that the current can be adjusted fr o m zero to the full rated value.

8. Turn off the power supply and remove the short wire from the output terminals.

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

CC annunciator

1.3 If the Power Supply Does Not Turn On

Model

Fuse Description

1785B, Fuse 2.5A T 250V for 220VAC

Fuse 5A T 250V for 110VAC

1788 Fuse 3.15A T 250V for 220VAC

Fuse 6.3A T 250V for 110VAC

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 po wer suppl y 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 vo ltag e 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.

1786B, 1787B

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 arro w 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

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

needn’t to use the front cover panel.

Dimension unit (mm)

Chapter 2 Specifications

Parameter

1785B

1786B

1787B

1788

0 ~18 V

0 ~32 V

0 ~72 V

0 ~32 V

0~1.5 A

0 ~19 V

0 ~33 V

0 ~73 V

0 ~33 V

±(％

(rated current < 3 A) <0.01％ + 3 mV (rated current< 10 A) <0.02％ + 5 mV

±(％

Programming

Resolution

10 mA

Readback Resolution

10 mV(<20 V)

100 mV(≥20 V)

Programming

Accuracy, 12months,

(

±(％

Readback Accuracy 12months,

±(％

Temperature Coefficient,

±(％

Readback Te

±(％

2.1 Specifications

Output Ratings,

( 0 °C - 40 °C)

Load Regulation,

of output+offset)

Line Regulation,

of output+offset)

@ 25 °C ± 5 °C)

of output+offset)

(25 °C ± 5 °C)

of output+offset)

Voltage Current 0 ~5 A 0 ~3 A LVP

Voltage

Current Voltage Current Voltage 10 mV

Current

Voltage Current 10 mA

Voltage <0.05% + 10 mV

Current

Voltage

Current

<0.05%+15 mV(<20 V), <0.05%+120

<0.1％ + 5 mA <0.1％ + 3 mV <0.1％ + 2 mA

<0.2％+10 mA

mV(≥20 V)

<0.1％+15 mA

0~6 A

Ripple

(20Hz ~20MHz)

(0 °C ~ 40 °C)

mperature,

Coefficient,

of output+offset)

Voltage ≤1 mVrms/3 mVp-p

Current 5 mArms

Voltage <0.02%+5 mV

Current

Voltage

Current

<0.02%+15 mV(<20 V), <0.02%+120

<0.1％+5 mA

mV(≥20 V)

<0.1％+15 mA

2.2 Supplemental Characteristics

Type

1785B

1786B

1787B

1788

12.3Lbs.

5.6Kg

14.8Lbs.

6.7Kg

14.8Lbs.

6.7Kg

14.8Lbs.

6.7Kg

14Lbs.

6.4Kg

16.5Lbs.

7.5Kg

16.5Lbs.

7.5Kg

16.5Lbs.

7.5Kg

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

N.W

G.W

Dimensions WxHxD*

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

Specifications are subject to change without notice. To ensure the m ost cur r ent ver sion o f this m anual , pl ease d ow nload the c urrent v er sion here: http://www.bkprecision.com/search/manual/1785B For current up-to-date product in for mation, please visit www.bkprecision.com

(Unit: mm)

Out on/off

Chapter 3 Front-panel Operation

So far you have learned how to install your power supply and do quick start. During the quick start, you were briefly introduced to operating from the front panel as you learned how to check basic voltage and current functions. This chapter describes in detail the use of the front-panel keys and shows how they are used to accomplish power supply operati on.

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. A nd in this mode, if any non-func tiona l k e y is pres sed, t he po wer supp l y wi ll changed to Set mode, and the VFD wil l displa y the adj usted voltage a nd curr ent valu e. In Set mode,

the set voltage value will flash, you can press 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

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 power supply is remotely controlled, the Annunciators’’.

Rmt annunciator will also turn on, See ‘‘Display

▲ and ▼ ke ys to adjust the voltage value. In Set

ON annunciator will turn off.

CV annunciator will turn on. If, the

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

V-Set

Enter

Save

Recall

Enter

I-Set

0 0

Note:

Esc

Step2. Press the Solution 2: Step1. Power on the instrument

Step2. Press key.

Step3. Use the numeric keys to or Step4. Press to confirm the value

▲ and ▼ keys to change the value

▲ and ▼ keys to change the voltage 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

Step4. Press key to confirm the value

▲and ▼keys to change the current value

3.4 Saving and Recalling Operation

You can store u p to 16 different output states in storage r egister 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” throug h “16” are em pt y. You can reca ll t he sa ved set tings b y 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 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

recall.

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

▲ and ▼ keys to select the memory location (the range

▲ and ▼ keys to select the states which you want to

1. If the function keys were locked by password, you need to ente r 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 Men u), just

press key to exit.

3.5 Menu Operation

 Set Maximum voltage(>MAX VOLT）

Please be well known that the M ax voltage value should be in the range of ea ch type of Power

supply.

Enter

the full voltage range of its model.

Note:

Enter

Step1. Press key.

Step2. Select >MAX VOLT by using Step3. Press key.

Step4. Change the voltage value by using numeric keys to or Step5. Press key.

Note: After you setting the maximum voltage value, the o u tp u t voltage setup should

be in the range from 0 volt to maximum volt age .

▲ and ▼ key.

▲and ▼key.

The default maximum volt age is

 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

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

 Initiating the Output Voltage (>INIT VOLT)

This instruction can set the initial outp ut 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

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

 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.

 Setting the Baud Rate(>BAUDRATE)

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

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:

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

Default baud rate is 4800.

 Setting Address (>ADDRESS)

This instruction can set the communication address for each power supply. The address range is

from 0 to 30. 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.

 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 sta r t bit of your desired pas sword shouldn’t be 0.

PC Load

-E131 communication cable

COMPUTER

INSTRUM ENT

IT-E131 ISOLATED COMMUNICATION CABLE

TTL(5V)RS232 ISOLATION

859666668889942311

COMPUTER

INSTRUM ENT

IT-E131 ISOLATED COMMUNICATION CABLE

TTL(5V)RS232 ISOLATION

859666668889942311

Power

supply

Start

Bit

8 Data Bits

Stop

Bit

PARITY = NONE

Note:

RS232 cable. Please use IT-E131 to connect the m.

Chapter 4 Remote Operation Mode

The DB9 interface connector on the rear panel of the power supp ly can be transf erred 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 Communication 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 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

4.2 Communication setting

Before using the rem ote operatio n mode, pl ease m ake sure that t he baud rate and com munic ation address in power supply ar e the same as in the com puter software, otherwise, the com munication 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 4800 3． Data bit：8 bit 4． Stop bit：1 5． Parity：None

You send a 26 byte packet to the instrument. You then

• Get the data you requested.

Byte 0

Byte 1

Byte 2

Byte 3 to 24

Byte 25

0xAA

Address

Command

Command's data

Checksum

4.3 Frame format

Packet structure

The power supply is programmed using packets of bytes. A packet always contains 26 bytes, either going to or coming from the instrument. The basic programming rule is:

read a 26 byte packet back from the power supply to either

• Get the status of your submitted p acket, or

The following are conventions we will follow in this chapter:

1. Hexadecimal integers will be represented by the prefix 0x.

2. Numbers are in base 10 number system unless otherwise indicated.

3. Byte numbering is zero-based, meaning numbering starts with 0.

The structure of each 26 byte packet is:

Thus, the first byte of any command packet or returned packet is always 0xAA. Address must be a byte that is be tw een 0x00 and 0xFE. Setting of the address is optional. It

is not required to communicate with the instrument. The address can be set f r om the front panel and is stored in non-volatile memory. This feature is useful when communicating via USB, and connecting several instruments, e.g. via a USB hub. In this scenario, Windows assigns a virtual COM port to each device which is unknown prior t o establishing communications with the instrument (could be different each time). In this case, the user ca n correlate each virtual COM port randomly assigned by Windows with a user de fined address.

Command is a byte that identifies which power supply command is used. The area for the command's data contains parameter information for the command or the

data that is requested via a previous command. Some commands have no data at all. It is a good programming practice to set all unused bytes to 0x00.

The checksum number is the arithmetic sum of eac h of the bytes modulo 256.

Status packets

Byte 0

Byte 1

Byte 2

Byte 3

Byte 4 to 24

Byte 25

0xAA

Address

0x12

Stat us byte

Reserved

Checksum

0x90

Checksum incorrect

0xA0

Parameter incorrect

0xB0

Unrecognized comman d

0xC0

Invalid command

0x80

Command was successful

When you send a command that does not cause t he power supply to send requested information back to you, you will receive a status packet back. The structure of a status packet is

The meaning of the return status byte is defined below:

Description:

1． Start bit is 0xAA, occupies a byte. 2． Address range is 0x00 to 0xFE，occupies a by t e. 3． Command occupies a byte.

a． 0x20----Setting the remote control mode b． 0x21----Setting the output ON/OFF state c． 0x22----Setting the maximum output voltage d． 0x23----Setting the output voltage e． 0x24----Setting the output current f． 0x25----Setting the communication address g． 0x26----Reading the present current/voltage, maximum voltage, setup voltage/current and

operation states of the power supply. h． 0x27----Enter the calibration mode i． 0x28----Reading the calibration mode state j． 0x29----Calibrate voltage value. k． 0x2A----Sending the actual output voltage to calibration program. l． 0x2B----Calibrate current value. m． 0x2C----Sending the actual output current to calibration program n． 0x2D----Save the calibration data to EEPROM. o． 0x2E----Setting calibration information. p． 0x2F----Reading calibration information. q． 0x31----Reading product’s model, series number and version information. r． 0x32----Restoring the fac tory def ault ca libr ati on data. s． 0x37----Enable the local k ey. t． 0x12----The return information of command operation in power supply.

For a four byte integer, we will use the following notation:

Least significant two bytes, most significant byte

Most significant two bytes, least significant byte

Most significant two bytes, most significant byte

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

the power supply output by computer. The command for remote control is 0x20. If you want to calibrate the power supply, set the calibration information. If you want to set the product serial number, you must set the calibration protection mode to OFF state first. The command f or calibration protection is 0x27. When the power supply is in calibration mode, changes for the output state of power supply are not allowed.

4. 4th to 25th bytes are information content

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

Command Details:

In the following sections, we abbreviate the details of the commands. Since the first three bytes of a command are i) the constant 0xAA, ii) the instrument address, and iii ) the command, we will not show those for each command. In addition, the 26th byte, the checksum, will also not be shown.

The table includes a column for Byte offset. This is the zero-based index of the byte in the packet. Note the offset numbers are in decimal.

A table entry of “Reserved” means the data are currently unused or reserved f or future use. Good programming practice is to set these bytes to 0x00.

Some commands require two byte and four byte integers to represent parameter settings. These integers are stored in the command packet in little-endian format. Little-endian is a byte ordering format in which bytes with lower addresses have lower significance. We will refer to the individual bytes as follows:

For a two byte integer, the least significant byte will be called the low byte and the most significant byte will be called the high byte.

Least significant two bytes, least significant byte

As an example, for the integer 0x23A749F5, we’d have

1 2 3

byte: 0xF5 Lower low byte

byte: 0x49 Lower high byte

byte: 0xA7 Higher low byte

byte: 0x23 Higher high byte

4.4 Communication pr o toc ol

1st byte

Start bit( 0xAA )

2nd byte

Address(0x00~0xFE)

3rd byte

Command （0x20）

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

1st byte

Start bit (0xAA )

2nd byte

Address(0x00~0xFE)

3rd byte

Command (0x21)

4th byte

Output state(0 is OFF，1 is ON)

5th to 25th byte

System reserve

26th byte

Check sum

1st byte

Start bit (0xAA )

2nd byte

Address(0x00~0xFE)

3rd byte

Command (0x22)

4th byte

The lowest byte of voltage upper limit (1 represents 1 mV)

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: Suppose you want to set the maximum voltage to 16.23 V. Since 1

Note: You cannot control the powe r supply from the front panel when

1．Setting the remote control mode (0x20)

2．Setting the output state ON/OFF (0x21)

the power supply is in calibration mode.

3．Setting the maximum output voltage (0x22)

represents 1mV, therefore 16.23 V translates to 16,230 in decimal. With 4 bytes in Hex, that would be 0x0003F66. Since the bytes are ordered in little-endian format, 0x66 would be the 3 byte.

byte, 0x3F the 4th byte, 0x00 as 5th byte, and 0x00 as the 6th

4. Setting the output voltage (0x23)

1st byte

Start bit (0xAA )

2nd byte

Address(0x00~0xFE)

3rd byte

Command（0x23）

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

7th byte

The highest byte of output voltage value

8th to 25th byte

System reserve

26th byte

Check sum

1st byte

Start bit (0xAA )

2nd byte

Address (0x00~0xFE)

3rd byte

Command（0x24）

4th byte

To set the low byte of current value (1 represents 1 mA)

5th byte

To set the high byte of current value

6th to 25th byte

System reserve

26th byte

Check sum

1st byte

Start bit ( 0xAA )

2nd byte

The current address of power supply(0x00~0xFE)

3rd byte

Command(0x25)

4th byte

The new address

5th to 25th byte

System reserve

26th byte

Check sum

1st byte

Start bit ( 0xAA)

2nd byte

Address(0x00~0xFE)

3rd byte

Command（0x26）

4th byte

Byte 0 of measured output curr ent value

5th byte

Byte 1 of measured output current value

6th byte

Byte 0 of measured output voltage value

7th byte

Byte 1 of measured output voltage

8th byte

Byte 2 of measured output voltage

Note: Suppose you want to set the maximum current to 3.12 A. Since 1

5．Setting the output current (0x24)

represents 1 mA, 3.12 A translates to 3,120 in decimal. With 2 bytes in Hex, that would be 0x0C30. Since the bytes are ordered in little-endian format, 0x30 would be the 4

byte, and 0x0C as 5th byte.

6. Setting the c om m unica ti on address (0x25)

7. Reading the measured output current/voltage, maximum voltage setting, voltage/current setting, and the states of power supply. (0x26)

9th byte

Byte 3 of measured output voltage

10th byte

Power supply’s state

11th byte

Byte 0 of current value setting (current limit value)

12th byte

Byte 1 of current value setting

13th byte

Byte 0 of the maximum voltage setting

14th byte

Byte 1 of the maximum voltage setting

15th byte

Byte 2 of the maximum voltage setting

16th byte

Byte 3 of the maximum voltage setting

17th byte

Byte 0 of voltage value setting

18th byte

Byte 1 of voltage value setting

19th byte

Byte 2 of voltage value setting

20th byte

Byte 3 of voltage value setting

21st to 25th byte

System reserve

26th byte

Check sum

byte

Start bit(0xAA)

2nd byte

Address(0x00~0xFE)

3rd byte

Command(0x27)

4th byte

Calibration protection state

5th byte

Calibration password(0x28)

6th byte

Calibration password(0x01)

7th to 25th byte

System reserve

26th byte

Check sum

Note:

Byte 3

Byte 2

Byte1

Byte0

7 6 5 4 3 2 1

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

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

From higher bit to lower bit

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

mode.

3. The frame format is the same as above

8. Entering the calibration mode（0x27)

1st byte

Start bit(0xAA)

2nd byte

Address(0x00~0xFE)

3rd byte

Command(0x28)

4th byte

Calibration protection state

5th byte

System reserve

26th byte

Check sum

1st byte

Start bit(0xAA)

2nd byte

Address(0x00~0xFE)

3rd byte

Command(0x29)

4th byte

Calibrated voltage points(point 1-3)

5th to 25th byte

System reserve

26th byte

Check sum

1st byte

Start bit (0xAA)

2nd byte

Address(0x00~0xFE)

3rd byte

Command(0x2A)

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

Note:

7 6 5 4 3 2 1

Note:

from higher bit to lower bit

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

follows:

0 bit：Protection sta te, 0 is to disa ble protecti on, 1 is to enable the protection.

9. Reading the calibration state (0x28)

10. Calibrating the voltage value (0x29)

To calibrate the 3 points of voltage sequentially.

11. Sending the present output voltage to calibration program (0x2A)

12. Calibrate the current value (0x2B)

1st byte

Start bit(0xAA)

2nd byte

Address(0x00-0xFE)

3rd byte

Command(0x2B)

4th byte

Calibrated current points( point 1-2)

5th to 25th byte

System reserve

26th byte

Check sum

1st byte

Start bit (0xAA)

2nd byte

Address(0x00~0xFE)

3rd byte

Command(0x2C)

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

1st byte

Start bit(0xAA)

2nd byte

Address (0x00~0xFE)

3rd byte

Command(0x2D)

4th to 25th byte

System reserve

26th byte

Check sum

1st byte

Start bit (0xAA)

2nd byte

Address (0x00~0xFE)

3rd byte

Command(0x2E)

4th to 23rd byte

Calibration information(ASIC code)

24th byte

System reserve

25th byte

System reserve

26th byte

Check sum

1st byte

Start bit (0xAA)

2nd byte

Address (0x00~0xFE)

3rd byte

Command（0x2F）

4th to 23rd byte

Calibration information(ASCII code)

24th byte

System reserve

25th byte

System reserve

26th byte

Check sum

Note: To calibrate the 2 points of the current value se quentially.

13. Sending the actual output current to calibration program (0x2C)

14. Save the calibration data to EEPROM（0x2D）

15. Setting calibration information (0x2E)

16. Reading calibration information (0x2F)

1st byte

Start bit (0xAA)

2nd byte

Address (0x00~0xFE)

3rd byte

Command (0x31)

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

1st byte

Start bit (0xAA)

2nd byte

Address(0x00~0xFE)

3rd byte

Command(0x32)

4th to 25th byte

System reserve

26th byte

Check sum

1st byte

Start bit ( 0xAA)

2nd byte

Address (0x00-0xFE)

3rd byte

Command (0x37)

4th byte

Enable/disable local key (0 is disable, 1is enable)

5th to 25th byte

System reserve

26th byte

Check sum code

Note:

ASCII Code

Hexadecimal

30 1 31 2 32 3 33

35 6 36

17. Reading product’s model, series number and version information (0x31)

For example, the serial number is 0123456789，the product model is 6811，and software

version is V2.03, then the returned data is as follows:

Here’s a conversation table between ASCII code and hexadecimal:

18. Restore the factory default calibration data (0x32)

19．Enable the local key (0x37)

1st byte

Start bit (0xAA)

2nd byte

Address (0x00~0xFE)

3rd byte

Command(0x12)

4th byte

Command checkout result

5th to 25th byte

System reserve

26th byte

Check sum

Note:

and all local keys will work.

The local keys on the front panel are not allowed to use when the power supply is in remot e mode. If the lo cal 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 (0x12)

When the power supp ly receives a frame command, it will che ck the frame command, if the check sum is correct, then it will return to 0x80, if there is any error on setting parameter or over parameter, then it will return to 0xA0, if the command wasn’t executed, then it will return to 0xB0, if the command isn’t effective, then it will return to 0xC0. Or otherwise , it will return to 0x80.

5 6 7 8

Chapter 5 PV1785B-1788 Software

5.1 Introduction

Software PV1785B-1788 is control software for IT1785B-1788 series programmable power supply . I t ca n work with all s ingle -output po wer suppl y models. P lease mak e sure that you p urchased communication cable, and use it to connect the po wer supply and com puter before the communicating. This software can accomplish al l the func tions of the po wer supp ly, such as setting constant voltage, setting constant current, max voltage etc. Also you can mak e quickl y settings or mak e a program for the outp ut voltage and current by the computer. In addition, PV1785B-1788 offer a GO/NG test function for automatic factory testing. It brings you much convenience when you use the power supply.

5.2 System 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.

5.3 Functions of PV-1785B-1788

Start the software PV1785B-1788, the windo ws is as follows:

1) Comm : to set the communication port, baud rate and

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 e nable the local n umeric key ⑦，it means that if you select “Enable” o n this button, when the

power supply is under rem ote control mode, you can press numeric key ⑦ to change the c ontrol

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 wil l be displ a yed.

To make a pr ogram of voltage and current values f or the power su pply, or to set the output value

quickly. Using the rotary knob to s et the vo ltage va lue, th e set u p valu e a nd pr es ent v alue w ill b e d is played

in the 2 indicators.

5.3.1Configure the system

The first step for communication is to configure the system, click Configure button , the

windows will display as follows:

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.

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/Current step: to set the step s ize of Arrow key, page up/down key, and Mouse-wheel. W hen you set the value by clicking the k nob, 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.

Communication status

Model number

Use mouse to click on the rotary knob and move mouse

indicator.

5.3.2 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 num ber of the field power supp ly which detected by the computer. (6811/6812/6821/6822/6823……..).

2. Communication status ( Communication successful/Communication waiting), if Communication

waiting appears here for more t ha n 10 seconds, you need to ch ec k if there is any connection f ai lure between computer and power supply. After confirming the effective connection, then re-configure the baud rate, address, comport etc, to m ake sure the same baud rate and address between power supply and computer.

5.3.3 Setting Voltage and current

1. Setting voltage/current by rotary knob

to change the value. You also can use mouse wheel, or Page Up/Down keys and arrow keys (↑, ↓, ←, →) from the keyboard to chan ge the voltage value m ore slightl y. The setup value will be displayed on the second line indicator.

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 slightl y. 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

Hot Key: Right-click each Hotkey Button, it will d is p la y as

Voltage Sweep: To set voltage sweep. For example,

Program: Right-click on the Program area, the program tools

3. Program setting

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

StartValue=1V, Stop Value=12V, Voltage Step=0.5V, TimeDelay=2s. When you click the “Run” button, the voltage will change according to the voltage sweep setup value, display as follows: then you can click “Stop” button to stop the voltage sweep.

(AppendLine, Insert Li ne, DeleteLine) 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 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.

5.3.4. GO/NG Test Function

GO/NG is an auto test function, to test if the EUT (equipment

Double click the voltage

Double click the current

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.

5.3.5 Save and Open

To save the program settings, quickly settings, voltage sweep settings and GO/N G settings as PAR file.

To open the PAR file for reloading the program settings, quickly settings, voltage sweep settings and GO/NG settings.

5.3.6 Present Voltage/C urrent Chart

chart, the voltage chart will be enlarged and will display as more details.

chart, the current chart will be enlarged and will display with more

5.3.7 Chart Description

Click here and

move to zoom

in/out axes or

scroll axes

To set the Y-Axes Span To set the X-Axes Span

Click here and

move to zoom

in/out axes or

scroll axes

To set the Y-Axes Span To set the X-Axes Span

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:

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

SERVICE INFORMATION

Warranty Service: Please go the support and service section on our webs ite www.bkprecision.com to obtain a RMA #. Return

the product in the original packaging with proof of purchase to the address below. Clearly state on the RMA the performance problem and return any leads, probes, connectors and accessories that you are using with the device.

Non-Warranty Service: Please go the support and service section on our website www.bkprecision.com to obtain a RMA #. Return the pr oduc t in t he or igi nal pac k ag ing t o the addr es s below . C l ear ly sta te on the R MA the per f orma nce prob lem and return any leads, probes, connectors and acce ssorie s tha t y ou a re us ing w ith t he de vi ce . Cust om ers not on a n open a ccoun t m us t i nclude payment in the form of a money order or credit card. Fo r th e most current repair charges pl ease refer to the service and support section on our website.

Return all merchandise to B&K P recision Corp. with pre-paid shipping. The flat-rate repair charge for Non-Warranty Service does not include return shipping. Return shipping to locations in North America is included for Warranty Service. For overnight shipments and non-North American shipping fees please contact B&K Precis ion Corp.

B&K Precision Corp.

22820 Savi Ranch Parkway

Yorba Linda, CA 92887

www.bkprecision.com

714-921-9095

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

LIMITED ONE-YEAR WARRANTY

B&K Precision Corp. warrants to the original purchaser that its products and the component parts thereof, will be free from defects in workmanship and materials for a period of one year from date 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 of a sales receipt.

To obtain warranty coverage in the U.S.A., this product must be regist ered by completing a warran ty registration for m on our website www.bkprecision.com

Exclusions : Thi s w arranty d oes not apply in the event o f misuse or abuse of the product or as a result of unaut horize d alterations or repairs. The warranty is void if the serial number is altered, d e faced or removed.

B&K Precision Corp. shal l not be liable for any consequent ial damages, including without limitation damages resulting from loss of use. Some states do not allow limitations 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.

within fifteen (15) days of purchase.

B&K Precision Corp.

22820 Savi Ranch Parkway

Yorba Linda, CA 92887

www.bkprecision.com

714-921-9095

22820 Savi Ranch Parkway

Yorba Linda, CA 92887

www.bkprecision.com

Printed in China v020713

B&K Precision 1785B User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Content

Quick Reference

About your safety

General information

Protection from electric shock

Definition of users

Certification and Warranty

Certification

Introduction

The Front Panel at a Glance

Function keys description

Menu description

Display annunciators

The Rear Panel at a Glance

Chapter 1 Quick Start

1.1 Preliminary Checkout

1.2 Output Checkout

1.2.1 Voltage Output Checkout

1.2.2 Current Output Checkout

1.3 If the Power Supply Does Not Turn On

1.4 To Adjust the Carrying Handle

1.5 To Rack Mount the Instrument

Chapter 2 Specifications

2.1 Specifications

2.2 Supplemental Characteristics

Chapter 3 Front-panel Operation

3.1 Front-panel Operation Overview

3.2 Constant Voltage Operation

3.3 Constant Current Operation

3.4 Saving and Recalling Operation

3.5 Menu Operation

Chapter 4 Remote Operation Mode

4.1 IT-E131 Communication cable

4.2 Communication setting

4.3 Frame format

Packet structure

Status packets

4.4 Communication pr o toc ol

Chapter 5 PV1785B-1788 Software

5.1 Introduction

5.2 System Installation

5.3 Functions of PV-1785B-1788

5.3.1Configure the system

5.3.2 Status bar

5.3.3 Setting Voltage and current

5.3.4. GO/NG Test Function

5.3.5 Save and Open

5.3.6 Present Voltage/C urrent Chart

5.3.7 Chart Description

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