B&K 1785B, 1787B, 1788, 1786B User Manual

Model

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

Instruction Manual

Content

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

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

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

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

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

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

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

Function keys description.........................................................................................................6

Menu description ......................................................................................................................6

Display annunciators ................................................................................................................6

The Rear Panel at a Glance.....................................................................................................7

Chapter 1 Quick Start ......................................................................................................................8

1.1 Preliminary Checkout .........................................................................................................8

1.2 Output Checkout.................................................................................................................9

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Quick Reference

About your safety

Pease review the following safety precautions before operating our equipment.

General information

The following safety precautions should be observed before using this product and any associated instrumentations. Although some instruments and accessories would be used with non-hazardous voltages, there are situations where hazardous conditions may be present.

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

Protection from electric shock

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

Definition of users

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

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

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

operating instructions located in the manual.

High voltage danger

Certification and Warranty

Certification

We certify that this product met its published specifications at time of shipment from the factory.

Introduction

The 1785B - 1788 Series power supplies are high performance single-output programmable DC power supplies with communication interface. The combination of bench-top and system features in these power supplies provides versatile solutions for your design and test requirements.

Convenient bench-top features:

• Nice appearance, small-size and light weight

• VFD display

• Soft Rubber numeric keypad

• Adjustable & constant voltage outputs

• Adjustable & constant current outputs

• Output on/off

• High accuracy and high resolution

• Excellent load and line regulation

• Low ripple and noise

• Limit voltage protection

• Over current/temperature protection

• Sixteen operating states storage

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

The Front Panel at a Glance

? 10 digits VFD display ? Status information for operating mode and working status ? Power switch ? Number keys ? Function keys ? UP/DOWN and ENTER key ? Output terminals

V-set I-set Save

Menu Recall

Out on/off

Function keys description

Set the output voltage value

Set the current value

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

Recall a saved settings from location ‘‘1’’through ‘‘16’

Menu function to set related parameters of the power supply

Output ON/OFF, to enable/disable the output

Menu description

>MAX VOLT

Set the maximum output voltage value

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

any key

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

Display annunciators

ON Output ON

ON Output ON Oh Overheat protection state

Oh Overheat protection state CV The power supply is in constant

CV The power supply is in constant

voltage mode.

CC The power supply is in constant

current mode.

Unreg The output of the power supply

is unregulated (neither CV nor CC)

The Rear Panel at a Glance

Link The power supply is in communication

mode

Rmt The power supply is in remote mode

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

Cal The power supply is in calibration mode

The function keys are locked by password

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

The rotate speed of cooling fan

1 2 43 51 2 43 5

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

ERR EEPROM

ERROR CAL

Warning

Chapter 1 Quick Start

One of the first things you will want to do with your power supply is to become acquainted with the front panel. The exercises in this chapter prepare the power supply for use and help you get familiar with some of its front-panel operations.

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

1.1 Preliminary Checkout

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

1. Check the list of supplied items.

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

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

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

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

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

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

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

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

Out

on/off

Out

on/off

Out

on/off

1.2 Output Checkout

The following procedures check to ensure that the power supply develops its rated outputs and properly responds to operation from the front panel.

1.2.1 Voltage Output Checkout

The following steps verify basic voltage functions without load.

1. Turn on the power supply.

2. Enable the outputs.

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

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

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

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

1.2.2 Current Output Checkout

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

1. Turn on the power supply.

2. Disable the output

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

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

Use a wire size sufficient to handle the maximum current.

4. Enable the output.

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

5. Adjust the voltage value to 1.0 volt.

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

6. Adjust the current value.

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

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

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

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

zero.

7. Ensure that the current can be adjusted from zero to the full rated value.

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

1.3 If the Power Supply Does Not Turn On

Use the following steps to help solve problems you might encounter when turning on the instrument. If you need more help, refer to chapter 6 for instructions on returning the instrument to the supplier for service.

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

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

2. Verify the power-line voltage setting.

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

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

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

Fuse Description

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

1.4 To Adjust the Carrying Handle

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

Bench-top viewing positions Carrying position

1.5 To Rack Mount the Instrument

You can mount the power supply in a standard 19-inch rack cabinet using the IT-E151 rack mount kit.

Note: Remove the carrying handle and the two plastic ears before rack-mounting the instrument.

To remove the handle, grasp the handle by sides and pull outwards and rotate it to a special position to let the arrow on the handle and the arrow on the plastic ears be in opposite directions, then pull the handle outward. After removing the handle, you can use a screwdriver to remove the two plastic ears.

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

Side view of rack mounting a single instrument

Programmi

Resolution

Read

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

needn’t to use the front cover panel.

Dimension unit (mm)

Chapter 2 Specifications

2.1 Specifications

Parameter 1785B 1786B 1787B 1788

Output Ratings,

( 0 °C - 40 °C)

Load Regulation, ±(% of output+offset)

Voltage Current

LVP Voltage

Current

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

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

<0.01% + 3mV

Model 1788 = <0.02% + 5mV

<0.1% + 2mA

0~6A

Line Regulation, ±(% of output+offset)

back Resolution

Voltage Current

Voltage 10mV

Current

Voltage Current

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

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

10mA

0.05% + 15mV(<20V)

< 0.1% + 15mA

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