BK Precision BK Precision 9172B-220V Manual

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Model: 9171B, 9172B, 9173B, 9174B, 9181B, 9182B, 9183B, 9184B, 9185B

Programmable DC Power Supplies

USER MANUAL

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Safety Summary

The following safety precautions apply to both operating and

maintenance personnel and must be observed during all phases of

operation, service, and repair of this instrument. Before applying

power, follow the installation instructions and become familiar with

the operating instructions for this instrument.

If this device is damaged or something is missing, contact the place of purchase immediately.

This manual contains information and warnings that must be

followed to ensure safe operation as well as maintain the meter in

a safe condition.

GROUND THE INSTRUMENT

To minimize shock hazard, the instrument chassis and cabinet

must be connected to an electrical ground. This instrument is

grounded through the ground conductor of the supplied, three-

conductor ac power cable. The power cable must be plugged into

an approved three-conductor electrical outlet. Do not alter the

ground connection. Without the protective ground connection, all

accessible conductive parts (including control knobs) can render an

electric shock. The power jack and mating plug of the power cable

must meet IEC safety standards.

DO NOT OPERATE IN AN EXPLOSIVE ATMOSPHERE

Do not operate the instrument in the presence of flammable gases

or fumes. Operation of any electrical instrument in such an

environment constitutes a definite safety hazard.

KEEP AWAY FROM LIVE CIRCUITS

Instrument covers must not be removed by operating personnel.

Component replacement and internal adjustments must be made

by qualified maintenance personnel. Disconnect the power cord

before removing the instrument covers and replacing components.

Under certain conditions, even with the power cable removed,

dangerous voltages may exist. To avoid injuries, always

disconnect power and discharge circuits before touching them.

DO NOT SERVICE OR ADJUST ALONE

Do not attempt any internal service or adjustment unless another

person, capable of rendering first aid and resuscitation, is present.

DO NOT SUBSTITUTE PARTS OR MODIFY THE INSTRUMENT

Do not install substitute parts or perform any unauthorized

modifications to this instrument. Return the instrument to B&K

Precision for service and repair to ensure that safety features are

maintained.

WARNINGS AND CAUTIONS

WARNING and CAUTION statements, such as the following

examples, denote a hazard and appear throughout this manual.

Follow all instructions contained in these statements.

A WARNING statement calls attention to an operating procedure,

practice, or condition, which, if not followed correctly, could result in

injury or death to personnel.

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A CAUTION statement calls attention to an operating procedure,

WARNING:

Do not alter the ground connection. Without the protective ground connection, all accessible conductive parts (including control knobs) can render an electric shock. The power jack and mating plug of the power cable meet IEC safety standards.

WARNING:

To avoid electrical shock hazard, disconnect power cord before removing covers. Refer servicing to qualified personnel.

CAUTION:

Before connecting the line cord to the AC mains, check the rear panel AC line voltage indicator. Applying a line voltage other than the indicated voltage can destroy the AC line fuses. For continued fire protection, replace fuses only with those of the specified voltage and current ratings.

CAUTION:

This product uses components which can be damaged by electrostatic discharge (ESD). To avoid damage, be sure to follow proper procedures for handling, storing and transporting parts and subassemblies which contain ESD-sensitive components.

practice, or condition, which, if not followed correctly, could result in

damage to or destruction of part or all of the product.

Compliance Statements

This product is subject to Directive 2002/96/EC of the European Parliament and the Council of the European Union on waste electrical and electronic equipment (WEEE) , and in jurisdictions adopting that Directive, is marked as being put on the market after August 13, 2005, and should not be disposed of as unsorted municipal waste. Please utilize your local WEEE collection facilities in the disposition of this product and otherwise observe all applicable requirements.

Disposal of Old Electrical & Electronic Equipment (Applicable

in the European

Union and other European countries with separate collection

systems)

CE Declaration of Conformity

The power supplies models 9171B, 9172B, 9173B, 9174B, 9181B, 9182B, 9183B, 9184B, 9185B meet the requirements of 2006/95/EC Low Voltage Directive and 2004/108/EC Electromagnet Compatibility Directive with the following standards.

Low Voltage Directive

- EN61010-1: 2001 Safety requirements for electrical equipment for measurement, control, and laboratory use. Part 1: General requirements

EMC Directive

- EN 61000-3-2: 2006

- EN 61000-3-3: 1995+A1: 2001+A2: 2005

- EN 61000-4-2: 1995+A1: 1998+A2: 2001

- EN61000-4-3: 2006+A1: 2008

- EN61000-4-4: 2004

- EN61000-4-5: 2006

- EN61000-4-6: 2007

- EN61000-4-11: 2004

- EN 61326-1: 2006

Electrical equipment for measurement, control, and laboratory use.

Safety Symbols

Refer to the user manual for warning information to avoid hazard or personal injury and prevent damage to instrument.

Chassis (earth ground) symbol.

On (Power). This is the In position of the power switch when instrument is ON.

Off (Power). This is the Out position of the power switch when instrument is OFF.

On (Supply). This is the AC mains connect/disconnect switch at the back of the instrument.

Off (Supply). This is the AC mains connect/disconnect switch at the back of the instrument.

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Table of Contents

1 General Information ......................................................... 13

1.1 Product Overview .............................................................. 13

1.2 Package Contents ............................................................... 14

1.3 Front Panel Overview......................................................... 15

Front Panel Description ............................................................... 17

1.4 Rear Panel Overview .......................................................... 18

Rear Panel Description ................................................................ 20

1.5 Optional Accessories .......................................................... 21

Interface Card Options ................................................................ 21

Rack mount Options.................................................................... 21

1.6 Display Overview ............................................................... 22

Display Description ..................................................................... 22

1.7 Installing Optional Interface Cards .................................... 23

How to Install Interface Cards ..................................................... 23

Removing Interface Cards ........................................................... 25

1.8 Rackmount Installation ...................................................... 26

2 Getting Started .................................................................... 31

2.1 Input Power and Fuse Requirements ................................ 31

Input Power ................................................................................. 31

Fuse Requirements ...................................................................... 31

2.2 Line Voltage Selection ........................................................ 32

2.3 Output Connections ........................................................... 34

2.4 Preliminary Check .............................................................. 36

Output Check .............................................................................. 38

Check Model and Firmware Version ........................................... 40

3 Front Panel Operation ...................................................... 41

3.1 Menu Options .................................................................... 41

How to Access the Menu ............................................................. 42

3.2 Remote Interface Setup ..................................................... 45

USB Interface (virtual COM) ........................................................ 45

GPIB Interface ............................................................................. 47

Ethernet (LAN) Interface ............................................................. 47

RS-232 and RS-485 Interface (Optional) ..................................... 48

3.3 Adjusting LCD Display, Key Lock, Key Sound ...................... 52

LCD Backlight Timer .................................................................... 52

Key Lock ...................................................................................... 52

Disabling Key Sound .................................................................... 53

3.4 Restore to Factory Default ................................................. 54

3.5 Configure Voltage and Current Output .............................. 56

Voltage and Current Limit Settings ............................................. 56

Configure Voltage and Current Output ....................................... 58

Slew Rate Configuration ............................................................. 64

Output Timer Function ................................................................ 66

Measurement Average Setting ................................................... 68

3.6 Dual Channel Configurations ............................................. 68

Multi/Single Output Control ....................................................... 68

Series/Parallel Tracking Mode .................................................... 69

3.7 Remote Sense .................................................................... 70

3.8 LED and Low Current Test Modes ...................................... 75

LED Mode .................................................................................... 75

Low Current Mode ...................................................................... 77

3.9 Output Protection .............................................................. 79

Configure OVP ............................................................................. 79

Configure OCP ............................................................................. 80

3.10 Save/Recall Output Settings .............................................. 81

3.11 Sequence Program Mode .................................................. 84

3.12 External Analog Control ..................................................... 85

3.13 Digital I/O ........................................................................... 90

INPUT .......................................................................................... 92

OUTPUT ...................................................................................... 93

3.14 Display Errors ..................................................................... 94

3.15 Connecting in Series and Parallel ....................................... 95

4 Remote Operation .............................................................. 97

4.1 Interface Connection ......................................................... 97

USB (Virtual COM) & RS-232 ....................................................... 97

GPIB ............................................................................................ 98

Ethernet (LAN) ............................................................................ 99

4.2 Remote Commands ......................................................... 104

Parameter Definitions ............................................................... 105

Remote Commands ................................................................... 105

4.3 Sequence Programming ................................................... 148

Examples ................................................................................... 148

4.4 Multi Unit Programming .................................................. 152

Remote Commands via USB ...................................................... 153

5 Troubleshooting Guide ................................................. 165

General ..................................................................................... 165

Remote Control ......................................................................... 167

6 Specifications ................................................................... 168

7 Calibration ......................................................................... 174

Access Calibration Menu ........................................................... 174

Requirements ............................................................................ 174

Current Calibration ................................................................... 175

Voltage Calibration ................................................................... 178

External Analog Input Calibration............................................. 180

Index ........................................................................................... 185

SERVICE INFORMATION ........................................................ 186

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1 General Information

1.1 Product Overview

The 917xB and 918xB series are high-performance dual range linear DC power supplies that provide clean and reliable power with high resolution and accuracy. All models are programmable via standard USB interface or optional RS232, GPIB and LAN interface. Interface cards and I/O cards come in a modular form factor. Selected models feature high voltage outputs or dual channels to provide series/parallel tracking functionality. All models include front and rear panel outputs for flexibility, and feature programmable list mode for storing and running customized test sequences. Additionally, a unique LED test mode function can be enabled for LED test applications requiring minimal inrush current output. These power supplies are suitable for bench or rack mount operation with the available rack mount kit option.

Features

 Single and dual output models with up to 210W output power  High accuracy and low noise output  Dual range output with automatic range selection (except of

high voltage models 9184B and 9185B)

 Fast transient response of < 50 μs of most models  Very low ripple and noise  LED test mode for low inrush current output  Programmable list mode for creating test sequences  Front and rear remote sense terminals for single output

models (except of high voltage models 9184B and 9185B)

 OVP, OCP, and OTP protection  Two interchangeable interface slots accepting any of the

following optional interface cards: LAN/GPIB, Digital I/O and Analog control, RS485, RS232

 Standard USB interface (virtual COM)  Programmable voltage and current slew rates

1.2 Package Contents

Please inspect the instrument mechanically and electrically upon

receiving it. Unpack all items from the shipping carton, and check for

any obvious signs of physical damage that may have occurred

during transportation. Report any damage to the shipping agent

immediately. Save the original packing carton for possible future

reshipment. Every power supply is shipped with the following

contents:

 917xB/918xB Power supply

 User Manual

 AC Power Cord

 USB Type A to Type B Cable

 Line fuse (for 115V or 230V operation)

 Certificate of Calibration

 Test Report

Verify that all items above are included in the shipping container.

If anything is missing, please contact:

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1.3 Front Panel Overview

2 5 6

2120 18

10 11 8 12 13

3 4 97

2 517106 7 11 8 129 133 4

Figure 1 - Front Panel for 9171B/9172B/9181B

Figure 2 - Front Panel for 9173B/9174B

Figure 3 - Front Panel for 9182B/9183B

2 5

106 7 11 8 129 133 4

2019 21

2 517106 7 11 8 129 133 4

Figure 4 - Front Panel for 9184B/9185B

Front Panel Description

Power ON/OFF button

LCD display

Esc / CLR button

Menu button

ISET button

VSET button

Decimal/LCL(Local) button

Numeric keypad

RCL (Recall) button

OVP indicator

OCP indicator

RMT (Remote mode) indicator

LOCK (Key lock) indicator

Enter button

Up, Down arrow keys

Left, Right arrow keys

Output button (Dual channel models have CH1 and CH2 output buttons)

Output ON/OFF indicator light

Main output terminals (Models 9182B,9184B,9185B have larger binding post terminals for high current/voltage outputs)

Front terminal shorting bars

Front panel +S/-S sense terminals (Not available with models 9173B, 9174B, 9184B, 9185B)

1 2 3 4 5 6 7 8 9

1.4 Rear Panel Overview

25 26 27

Figure 5- Rear View for 9171B/9172B/9181B

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25 24

3125 26 27

25 24

3125 26 27

Figure 6- Rear View for 9173B/9174B

Figure 7- Rear View for 9182B/9183B

S1 interface slot (shown with optional LAN/GPIB interface card)

S2 interface slot (shown with optional DIO/Analog interface card)

USB interface

Temperature controlled cooling fan(s)

AC input fuse box

Line input receptacle

Rear panel outputs (++/--) and sense (+S/-S) terminals

Shorting pins

Line voltage selection switch (bottom of power supply) See “2.2Line Voltage Selection” for details.

22 23

3124 26 27

Figure 8- Rear View for 9184B/9185B

Rear Panel Description

Chassis ground

Model

Description

DRGL

GPIB/LAN interface card

DR1DIO

Single channel digital I/O and analog control card

DR2DIO

Dual channel digital I/O and analog control card

DRRS485

RS485 interface card

DRRS232

RS232 interface card

Model

Description

DRRM2U1

Rackmount kit for single 2U power supply

DRRM2U2

Rackmount kit for two 2U power supplies mounted side by side

DRRM3U1

Rackmount kit for single 3U power supply

DRRM3U2

Rackmount kit for two l 3U power supplies mounted side by side

1.5 Optional Accessories

The following lists all optional accessories supported by the

917xB/918xB series power supplies.

Interface Card Options

Rack mount Options

Rackmount kits are available for all 9 models. Refer to the following

to determine your power supply rack mount size.

2U size: Models 9171B, 9172B, 9181B

3U size: Models 9173B, 9174B, 9182B, 9183B, 9184B, 9185B

Output Mode (CV, CC, OFF)

Voltage display (When output is OFF, it shows VSET voltage. When output is ON, it shows measured voltage)

Current display (When output is OFF, it shows ISET current. When output is ON, it shows measured current)

2 3 1

CH1CV CH2CV5 . 000 V1 . 000 A

2 3 1

Figure 9- Main Display

Figure 10- Dual Channel Main Display

1.6 Display Overview

The main displays for single and dual channel models are shown

below.

5 . 000 V1 . 000 A

Display Description

Selected channel indicators

1.7 Installing Optional Interface Cards

Five optional interface cards are available and can be installed in

either the S1 or S2 slots. They are:

Option 1: GPIB/LAN Card

Adds GPIB and LAN interface

Option2: DIO/Analog Card (Single channel)

Adds digital I/O and External Analog Control

Option 3: DIO/Analog Card (Dual channel)

Adds dual channel digital I/O and External Analog Control

Option 4: RS485 Card

Adds RS-485 interface for multi power supply control

Option 5: RS232 Card

Adds RS-232 interface

How to Install Interface Cards

1. Power off the instrument and disconnect the AC power cord

in the rear panel. Remove the back faceplate covering the

S1 or S2 slot in the rear panel by removing the two screws

on each side.

: : : : : : : : : : : : : : : : : : : : : :

Metal

notch

Card

rail

48-pin female connector

Interface card

2. Make note of the metal notches that indicate where the card

should slide into. Inside the slot, there are two rails (left and

right side) where the card should slide smoothly into. The

very back of the slot is a 48-pin female connector that should

connect with the 48-pins on the back of the interface card.

3. The interface card should go right below the metal notches

on both sides and fit in between the inner card rails, also on

both sides. Slide the card down carefully. When it touches

the 48-pin connector, slowly push the card all the way in until

the panel of the interface card aligns with the rear panel of

the power supply.

4. Place the two screws to tighten and secure the installed card.

5. Connect the power cord and turn on the power supply. The

newly installed card will be detected during boot up, indicated

next to S1: or S2: (depending on which slot the card is

installed into).

Removing Interface Cards

1. Power off the instrument and disconnect the AC power cord

in the rear panel. Remove the two screws on each side of

the installed interface card.

2. Use a flat blade screwdriver to gently pry the left and right

side of the interface card plate. When there is enough room,

use the screwdriver to pry the top part of the card until the

card has slid out with enough room to pull out the card by

hand.

3. Be sure to ground yourself before pulling out or touching any

parts of the printed board on the interface card.

1.8 Rackmount Installation

There are four rackmount kit options available for this series of

power supplies: 2U size for single power supply, 2U size for two

power supplies mounted side by side, 3U size for single power

supply, 3U size for two power supplies mounted side by side. The

following step by step instructions will guide you in installing these

optional rackmount kits onto the power supply for a standard 19-inch

rack fitting.

Models 9171B, 9172B, 9181B: Follow instructions for 2U

rackmount installation.

Models 9173B, 9174B, 9182B, 9183B, 9184B, 9185B: Follow

instructions for 3U rackmount installation.

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Remove t he parts

Step 2 :

St p 2

Step 1

1Remove t he parts

Step 1 :

2 3 4

Step 4

Fasten the p arts

Step 4 :

St p 3

Fasten th e parts

Step 3 :

7 98

Figure 11- 2U Single Supply Rackmount Installation

Step 1

Remove the parts

21 3 4

Step 3

Removethe parts

Step 5

Fasten the parts

Step 2

Step 4

Fasten the parts

Step 4

Fasten the parts

Remove the parts

Step 5

Step 7

Step 6

Fasten the parts

Figure 12- 2U Dual Supplies Rackmount Installation

Rem ove t he pa rts

Step 2:

Step 2

Step 1

Rem ove t he pa rts

Step 1:

21 43

Fas ten t he par ts

Ste p 4:

Step 4

9 5

5 5

Step 3

Fas ten t he par ts

Step 3:

97 8

Figure 13- 3U Single Supply Rackmount Installation

Step 1

Step 1:

Remove the parts

21 43

Step 3

Step 3:

Removethe parts

Step 5

Step 2

Step 2:

Fasten the parts

Step 4:

Fasten the parts

Step 4

Fasten the parts

Remove the parts

Step 5:

Step 7:

Step 7

Step 6

Step 6:

Fasten the parts

Figure 14–3U Dual Supplies Rackmount Installation

WARNING:

The included AC power cord is safety certified for this instrument operating in rated range. To change a cable or add an extension cable, be sure that it can meet the required power ratings for this instrument. Any misuse with wrong or unsafe cables will void the warranty.

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2 Getting Started

2.1 Input Power and Fuse Requirements

Input Power

The rated AC input power source for powering the supplies must be within:

115V Operation: 103.5V-126.5V 230V Operation: 207V - 253V

Frequency: 47 Hz – 63 Hz

Before connecting to an AC outlet or external power source, be sure that the power switch is in the OFF position and verify that the AC power cord, including the extension line, is compatible with the rated voltage/current and that there is sufficient circuit capacity for the power supply. Once verified, connect the cable firmly.

Fuse Requirements

An AC input fuse is necessary when powering the instrument.

Below is a table showing the required fuses for AC line input 115V

and 230V operation for all models.

Table 1- Input Fuse Table

Model

115 V AC

230 V AC

9171B

2.5 A

1.25 A

9172B

2.5 A

1.25 A

9173B

4 A

2 A

9174B

4 A

2 A

9181B

3.15 A

1.6 A

9182B

5 A

2.5 A

9183B

4 A

2 A

9184B

4 A

2 A

9185B

4 A

2 A

CAUTION:

For safety, no power should be applied to the instrument while changing line voltage operation. Disconnect all cables connected to the instrument before proceeding.

Note: All fuses listed have the specifications: T250V, slow

blow (slow acting), 5 x 20mm.

2.2 Line Voltage Selection

The power supplies can be selected to operate with 115V input or

230 V input. To ensure that your instrument is properly configured to

operate at the desired AC line voltage, please follow the steps

below:

Step 1 - Check and/or Change Fuse

Fuse box slit

Fuse box

Check/Remove Fuse

- Locate the fuse box next to the AC input connector in the rear

panel.

- With a small flat blade screwdriver, insert into the fuse box slit to

pull and slide out the fuse box as indicated below.

- Check and replace fuse (if necessary) for the desired line

voltage operation (see Table 1).

Step 2 - Check and/or Change Line Voltage Switch

- Carefully lift and turn the instrument upside down.

- Locate the red Line Voltage Switch, which has markings that

indicate “115” for 115V or “230” for 230V line operation. Set the

switch to the desired line voltage operation.

WARNING:

Do not connect power to the instrument until the line voltage selection is setup correctly. Applying an incorrect line voltage or configuring the line voltage selection improperly may damage the instrument and void all warranty.

2.3 Output Connections

Line Voltage Switch

Rear Panel

Front Panel

(Bottom View)

Front Feet

Rear Feet

These power supplies have both front panel binding posts and rear

panel terminals for output connections, and they are paralleled

together. The two (+) and two (-) (per channel for dual channel

models) rear output terminals can accept wire sizes AWG 24 to

AWG 12 (See Table 2).However, we recommend using 12 AWG if

current output is between 5 to 10 A. For current output above 10 A,

remove the shorting bars from the front panel, but do not remove the

shorting pins on the rear panel. Use two separate wires/leads to

connect both (+) terminals and (-) terminals as shown below:

WARNING:

DO NOT output 10 A or more with only one pair of (+) and (-) terminals. Both (+) and (-) terminals must all be connected for applications requiring more than 10 A output. Each terminal can only accept a maximum of 10 A. Exceeding this may damage the power supply.

AWG

Imax(A)

10 7 5

3.5

2.5

1.7

mΩ/meter

3.3

5.2

8.3

13.2

33.5

52.8

84.3

133.9

212.9

Rear Panel Output

- - S

DUT

+ -

+S + - -S

Remove shorting bars

Front Panel Output

For 10 A or higher current output

Table 2- Wire Gauge Rating

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WARNING:

Before connecting wires to the front or rear panel output terminals, turn OFF the power supply to avoid damage to the instrument and the device under test (DUT). For safety, load wires must have a wire gauge size large enough to prevent overheating when the power supply operates at maximum short circuit output current. It will also prevent large voltage drops from resistances in the wires.

2.4 Preliminary Check

POWER

Complete the following steps to verify that the power supply is ready

for use.

1. Verify Line Voltage Selection

Complete the steps as described in “2.2 Line Voltage

Selection” to make sure the supply is correctly setup to

operate with the line voltage source to be used.

2. Connect Power and Self Test

Connect AC power cord to the AC receptacle in the rear

panel and press turn on the instrument. It will run

through a self test procedure, as well as check for installed

interface cards. The following screens will display before it’s

ready for use (Display will vary based on the model and

installed interface cards)

SRAM TEST . . . . . . . . . . . . . . . . . . . OK

MAIN TEST . . . . . . . . . . . . . . . . . . .OK

CHECKING FOR OPTION CARD . .

B&K PRECISION

CHECKING FOR EEPROM DATA

S1 : GPIB/LAN CARD

9181B

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Output Check

Vset

Enter

OUTPUT

CH1

CH2

Voltage Check

Follow the steps below to check basic voltage output with no load

connected.

1. Turn on the power supply. The display will show the OFF

annunciator next to the setting voltage on the left side of the

display.

2. Enable the output by pressing (or and for

dual channel models). The output indicator light will be lit

and display will show the measured output voltage. The

OFF annunciator will change to CV.

3. Using the numeric keypad, press and enter a voltage

value. Then press the key. For dual channel models,

select the channel first before setting the voltage. The

selected channel is indicated by a flashing CH1 or CH2

annunciator on the display. Press or to select

the channel.

4. The measured output voltage should change to a value close

to or exactly what you entered (For example, if voltage value

is 30.000 V, it may show 29.998 V).

5. (Optional) You may also verify the output voltage by

connecting either the (+) and (-) terminals on the front panel

or the rear panel to an external voltmeter. The measured

value should match or be close to the entered voltage value.

Current Check

OUTPUT

Enter

Iset

CH1

CH2

Follow the steps below to check basic current output of the power

supply.

1. Turn on the power supply. The display will show the OFF

annunciator next to the setting voltage on the left side of the

display.

2. Short the (+) and (-) output terminals with test leads, shorting

bar, or clip. (Refer to Table 2 to select appropriate test

leads)

3. Enable the output by pressing (or and for

dual channel models). The output indicator light will be lit

and display will show the measured output voltage. The

OFF annunciator will change to CC.

4. Using the numeric keypad, press and enter a current

value. Then press the key. For dual channel models,

select the channel first before setting the voltage. The

selected channel is indicated by a flashing CH1 or CH2

annunciator on the display. Press or to select

the channel.

5. The measured output current should change to a value close

to or exactly what you entered (For example, if current value

is 5.0000 A, it may show 4.9998 A).

6. (Optional) You may also verify the output current by

connecting either the (+) and (-) terminals on the front panel

or the rear panel to an external current meter capable of

measuring the current that you set. The measured value

should match or be close to the entered current value.

7. Press to turn off the power supply and remove the

LCD VER = 2.00 / WEB VER = 1.04 MODULE VER = 1.10 / 1.10

POWER

Esc

short on the output terminals.

Check Model and Firmware Version

The model and firmware version can be verified from one of the boot

up screens, or from using the *IDN? query remote command,

described in “4.2 Remote Commands”. Additionally, other system

version and information can be found by following the steps below:

1. Press , then to enter INFORMATION. The

following screen will be displayed.

2. There are multiple version numbers shown. However, the

firmware version is displayed under MODULE VER. In the

example screen above, firmware version is shown as 1.10.

3. Press twice to exit the menu.

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3 Front Panel Operation

3.1 Menu Options

All settings and parameters can be configured from the built-in menu

system of the power supply. To access the menu, press .

The menu system is divided into 8 categories and organized as

follows:

1. SYSTEM SETTING

 REMOTE(USB,ETHERNET,GPIB,RS232 (optional))  GPIB ADDR(1-30)  KEY LOCK(ON,OFF)  IP CONFIG(STATIC)  IP ADDRESS(xxx.xxx.xxx.xxx, where x = 0-9)  BEEP(ON,OFF)  LCD BACKLIT(ALWAYS ON, 1,5,10,30 MINS OFF)  RECALL DEFAULT(NO,YES)  POWER ON STATE (OFF,LAST)  OUTPUT MODE (MULTI,SINGLE)*  TRACKING MODE (ON,OFF)*  EXTERN CONTROL (VOLT,RES,OFF) (optional)  EXTERN LEVEL (5V,10V) (optional)  EXTERN TRIG (ON,OFF) (optional)

2. OUTPUT SETTING

1. VOLT LIMIT SETTING

 VOLT LIMIT MAX (0 – Max. Voltage)  VOLT LIMIT MIN (0 – Max. Voltage)

2. CURR LIMIT SETTING

 CURR LIMIT MAX (0 – Max. Current)  CURR LIMIT MIN (0 – Max. Current)

3. VOLT SLEWRATE SETTING  V SLEWRATE

4. CURR SLEWRATE SETTING  I SLEWRATE

5. MEASURE AVERAGE(1-10)

6. LED MODE SETTING  LED MODE (ON,OFF)

 Low Current Mode (ON,OFF)**

Note: All optional menu items appear only when their respective optional

interface cards are installed inside the power supply.

Note: The menu cannot be accessed when the output(s) is turned ON or

when it is in remote mode (indicated by RMT light).

3. PROTECTION

1. OVP SETTING

 OVP (ON,OFF)  SET (0 – Max. Voltage)

2. OCP SETTING

 OCP (ON,OFF)  SET (0 – Max. Current)

4. MEMORY SETTING(0-9)

5. PROGRAM MODE

6. TIMER FUNCTION

 TIMER (ON,OFF)  TIME (hr:min:sec)

7. CALIBRATION

8. INFORMATION

9. CHAIN SETTING (optional)

 CHAIN ON/OFF (ON,OFF)  CHAIN ADDRESS(1-31)

*Dual channel models 9173B and 9174B only.

**Models 9184B and 9185B only.

How to Access the Menu

Before using the instrument, it is important to be familiarized with its

menu structure and how to view or change settings and parameters.

Follow the steps below to guide you in selecting menu options.

1. From the front panel, press to enter the main menu

1 . SYSTEM SETTING

4 . MEMORY SETTING

and the below screen will display. The on the bottom right

indicates that there are more categories below that can be

displayed.

2 . OUTPUT SETTING

2. Press to display those categories. The on the

upper right indicates that there are categories above the

current displayed categories shown. Press and the screen will display the previous menu categories.

5 . PROGRAM MODE

3. Each main category, as well as some submenu items within

the category, has a number next to their respective category

heading. Whenever you see a number next to a menu item

(i.e. 1. SYSTEM SETTING, 4. MEMORY SETTING), use the

numeric keypad to enter that number to access that

category’s menu or submenus. For example, press to

access the SYSTEM SETTING menu.

4. Within the category menus or submenus, adjustable settings

and parameters will have a cursor (indicated by an underline

of a digit or character) to indicate the current selection. Use

the and keys to select the setting you want to

Note: Changes to settings and parameters apply only when the

key is pressed to confirm the changes. Otherwise, they will

default to previous set option or value.

REMOTE = USB

Enter

change. Below is an example of the Remote settings being

selected. Note the underline below the first character of the

setting “USB”.

GPIB ADDR = 1

5. Settings have selectable options that are not numeric (i.e.

REMOTE settings shown above). To change them, press

or . To save the changes, press the .

6. Parameters have numerical set values (i.e. GPIB ADDR

parameter shown above). To change them, use the numeric

keypad to enter the value you want to change to. To save

the changes, press the key.

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3.2 Remote Interface Setup

Enter

The standard remote interface available on all models in the series

is the USB (virtual COM) interface. Other optional supported

interfaces such as GPIB, Ethernet (LAN), RS-232, and RS-485are

available, but dependent on the interface card(s) installed on the

instrument. This section will describe how to setup all the supported

interfaces.

Note: The RMT LED will automatically light up when the power

supply is successfully connected to a PC remotely through any

remote interface. Keys on the front panel will be locked until

(LCL) is pressed to set the instrument back to LOCAL mode.

USB Interface (virtual COM)

The USB interface comes standard on every power supply in the

series. A USB Type A to Type B cable (i.e. USB printer cable) is

required to connect the USB port ( in the rear panel to a PC.

Follow the steps below to setup the power supply for USB (virtual

COM) remote communication.

1. Press , then to enter SYSTEM SETTING. Select

REMOTE and verify that it shows USB, which is the default

option. If not, press or until “USB” is displayed.

Press to save changes.

2. Install the USB driver. Visit www.bkprecision.com to

Note: Do this before connecting the USB cable from the power supply to the PC.

download the driver. Run the setup executable after

unzipping the downloaded file.

3. Once the installation is successful, connect the USB cable

between the power supply and the PC. Drivers should be

automatically recognized. To verify, go to “Device Manager”

in Windows, and under “Ports (COM & LPT)”, a new device

listed as “210x USB to UART Bridge (COM#)” will be listed.

The “#” is the COM port number assigned by your computer

to interface with the instrument via USB virtual COM.

4. The serial (virtual COM) settings to use are:

BAUDRATE: 57600

PARITY: NONE

DATA BITS: 8

STOP BIT: 1

FLOW CONTROL: NONE

GPIB Interface

STATIC

Allows you to configure a static IP address for the power supply.

Enter

GPIB interface is available when the LAN/GPIB card is installed in

the “S1” or “S2” slots in the rear panel. To setup the power supply

for GPIB interface, follow the steps below:

1. Press , then to enter SYSTEM SETTING. Select

REMOTE and press or until “GPIB” is displayed.

Press to save changes.

2. Select GPIB ADDR and use the numeric keypad to enter the

GPIB address (1 – 30). Press to save changes.

Ethernet (LAN) Interface

LAN interface is available when the LAN/GPIB card is installed in the

“S1” or “S2” slots in the rear panel. To setup the power supply for

LAN interface, follow the steps below:

1. Press , then to enter SYSTEM SETTING. Select

REMOTE and press or until “ETHERNET” is

displayed. Press to save changes.

2. Select IP CONFIG and choose STATIC. Press to

save changes.

3. If STATIC is selected, then select IP ADDRESS and use the

Enter

numerical keypad to enter the static IP. After entering each

group of 3 digits, press to go to the next group. The

cursor will automatically move to the next group. Do this until

all 12 digits are entered. Be sure to press one more

time after entering the last 3 digits for the complete IP

address entry to be saved.

RS-232 and RS-485 Interface (Optional)

Both RS-232 and RS-485 interface are supported by the power

supply through an optional RS-232 or RS-485 interface card. Both

of these card options must be properly installed before they can be

used. See “1.7 Installing Optional Interface Cards” for details.

RS-232 Interface

The setup for remote control via RS-232 interface is very similar to

the same for USB virtual COM interface. To setup the power supply

for RS-232 operation:

1. Press , then to enter SYSTEM SETTING. Select

REMOTE and press or until “RS232” is displayed.

Press to save changes.

2. The settings used for RS232 communication are:

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BAUDRATE: 57600

PARITY: NONE

DATA BITS: 8

STOP BIT: 1

FLOW CONTROL: NONE

RS-485 Interface

Multiple power supplies (up to 31) can be connected together in

series and be controlled via USB (virtual COM) interface. Here is an

illustration of how the setup will look like:

Figure 15- RS-485 Setup to Control Multiple Supplies (USB)

To setup and configure the power supplies, follow these steps:

Requirements:

- Optional RS485 cards must be installed on each power supply

- For N number of power supplies, you will need N-1 number of

Ethernet CAT5 straight (pin-to-pin) cables. (Example: To connect

5 power supplies, 4 cables are required)

Note: The cables are used to link the power supplies together.

It is recommended to keep the cables as short as possible between each unit.

Communicate via USB

Note: The terminator switch should only be set to “On” for the

last power supply in the chain. All other power supplies should have the terminator switch set to “Off”.

1. Take one Ethernet CAT5 cable and connect one end to

labeled “OUT” on the RS485 interface card of the first power

supply (the one that will be connected to the PC via USB

cable).

2. Connect the other end to labeled “IN” on the RS485

interface card of the second power supply.

3. To connect a third power supply, use another Ethernet CAT5

cable and connect one end to labeled “OUT” on the

second power supply. Connect the other end to labeled

“IN” on the interface card of the third power supply.

4. Repeat steps 2 and 3 for each subsequent power supplies

added to the multi connection, making sure the connections

follow the “IN” and “OUT” scheme as described.

5. After connecting to the “IN” port of the last power supply in

the connection, if there are more than 10 units connected,

set the physical switch labeled “Terminator” on the RS485

interface card of this last unit to “On”.

6. With a USB Type A to Type B cable, connect one end to the

USB interface of the first power supply. Connect the other

end to a PC to be used to control all the supplies. Refer to

Figure 15 to verify your connections.

7. With the connections setup properly, on the first power

Enter

Esc

Enter

Esc

supply, press , then to enter SYSTEM SETTING.

Select REMOTE and verify that “USB” is selected. Press

to save changes.

8. Press once to go back to the main menu and press

to enter CHAIN SETTING.

9. Select CHAIN ON/OFF and press or to set it to “ON”.

Press to save changes.

10. Select CHAIN ADDRESS and set it to “1”. Press to

save changes and then press twice to exit the

menu.

11. Repeat steps 7 thru 10 for each of the power supplies in the

chain. However in step 10, set the CHAIN ADDRESS of

each power supply to a different number. (i.e. Set to 1 for

power supply #1, 2 for power supply #2, 3 for power supply

#3, …etc.) The address is used to reference the power

supply during remote operation.

12. Refer to “4.2 Remote Commands” for the list of remote

commands specific for RS485 communication.

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3.3 Adjusting LCD Display, Key Lock, Key

Options

Description

ALWAYS ON

Default – Display never dims.

1 MINS OFF

Display dims after 1 minute

5 MINS OFF

Display dims after 5 minutes

10 MINS OFF

Display dims after 10 minutes

30 MINS OFF

Display dims after 30 minutes

Enter

Sound

LCD Backlight Timer

The LCD backlight has a timer that can be set to dim its brightness

within a set time from when the instrument is idle. To set this:

1. Press , then to enter SYSTEM SETTING. Select

LCD BACKLIT. Press or to change the backlight

timer setting. Selectable options are:

2. Press to save changes.

Key Lock

Users can manually lock the front panel keypad. To set this:

1. Press , then to enter SYSTEM SETTING. Select

KEY LOCK. Press or to change it. Selectable

options are:

Options

Description

OFF

Default

Lock keypad

2. Press to save changes. Press twice to exit the

Options

Description

Default

OFF

Disable key beep

Enter

Esc

Enter

menu.

3. If ON is selected, all keys from the front panel, except

for , will be locked. The Lock LED indicator will be lit.

4. To unlock, press and the Lock LED indicator will turn off.

The KEY LOCK option under SYSTEM SETTING category

will automatically default back to OFF.

Disabling Key Sound

To disable the beep from key presses:

1. Press , then to enter SYSTEM SETTING. Select

BEEP. Press or to change it. Selectable options

are:

2. Change it to OFF, and press to save changes. All key

3. To enable it again, set BEEP to ON.

presses will no longer beep.

3.4 Restore to Factory Default

WARNING:

Restoring the instrument to factory default will change all current instrument settings and parameters back to their default values.

Options

Description

OFF

Default

Resets instrument with factory default settings and parameters

ARE YOU SURE TO RECALL DEFAULT?

Enter

All instrument settings can be reset back to their factory default

values by doing the following:

1. Press , then to enter SYSTEM SETTING. Select

RECALL DEFAULT. Press or to change it.

Selectable options are:

2. Change it to ON, and press . The following prompt will

display:

(YES/NO) NO

3. To cancel this action, press with NO marked by the

REMOTE

USB

GPIB ADDR

KEY LOCK

OFF

IP CONFIG

STATIC

IP ADDRESS

255.255.255.255

BEEP

LCD BACKLIT

ALWAYS ON

VOLT LIMIT MAX

Max. rated voltage of model

VOLT LIMIT MIN

0.000V

CURR LIMIT MAX

Max. rated current of model

CURR LIMIT MIN

0.0005A

MEASURE AVERAGE TIME

LED MODE

OFF

OVP SETTING

OFF, SET = Max. rated voltage of model

OCP SETTING

OFF, SET = Max. rated current of model

TIMER FUNCTION

OFF

Enter

cursor. To confirm resetting the instrument to factory default,

press to select YES and press .

4. After approximately 5 seconds, the instrument will

automatically jump back to the normal display. All settings

are now set back to their factory default values.

Table 3 Factory Default Settings

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3.5 Configure Voltage and Current Output

Enter

Esc

Voltage and Current Limit Settings

The power supply has software voltage and current limit protection

settings that can be configured to limit the settable range for output

from front panel or remote operation. Follow the steps in this section

to adjust these settings.

Voltage Limit Set

1. Press , then to enter OUTPUT SETTING. Press

to select VOLT LIMIT SETTING.

2. VOLT LIMIT MAX should be selected. Use the keypad to

enter the maximum voltage set limit and press to save

changes. The maximum voltage that can be set depends on

the power supply’s maximum output voltage.

3. VOLT LIMIT MIN is now selected. Again, use the keypad to

enter the minimum voltage set limit and press to save

changes.

4. Press once to return to previous menu items, or press

three times to exit the menu when finished.

Dual Channel Models

For models with dual channels, the display will look different, with

CH1 and CH2 indicators on the left side of the display to indicate

their respective VOLT LIMIT MAX/MIN parameters.

CH1 VOLT LIMIT MAX = _20.400 V

CH1 VOLT LIMIT MIN = 0 V

CH2 VOLT LIMIT MAX = _20.400 V

CH2 VOLT LIMIT MIN = _ 0.000 V

Enter

Esc

Current Limit Set

1. Press , then to enter OUTPUT SETTING. Press

to select CURR LIMIT SETTING.

2. CURR LIMIT MAX should be selected. Use the keypad to

enter the maximum current set limit and press to save

changes. The maximum current that can be set depends on

the power supply’s maximum output current.

3. CURR LIMIT MIN is now selected. Again, use the keypad to

enter the minimum current set limitand press to save

changes.

4. Press once to return to previous menu items, or press

three times to exit the menu when finished.

Dual Channel Models

For models with dual channels, the display will look different, with

CH1 and CH2 indicators on the left side of the display to indicate

their respective CURR LIMIT MAX/MIN parameters.

CH1 CURR LIMIT MAX = _10.200 A

CH1 CURR LIMIT MIN= 0.000 A

CH2 CURR LIMIT MAX = _10.200 A

CH2 CURR LIMIT MIN = _ 0.000 A

Vset

Enter

Configure Voltage and Current Output

Voltage and current can be set and output from the front panel and

the rear panel terminals. Refer to “3.7 Remote Sense” for setup

instructions if remote sense will be used for voltage compensation at

the output.

Setting Voltage

Follow the steps below to set the output voltage:

1. For single channel models, skip to step 2 below. For dual

channel models, from the main display press or

to select the channel for setting voltage. The channel

indicators CH1 or CH2 will flash to indicate the selected

channel.

2. With the main display shown, press se the numeric

keypad to enter your set voltage. Then press . Below is

an example screen for setting 5 V.

SET = 5.000 V

OFF5 . 000 V 1 . 000 A

SET = 5.000 V

CH2 OFF5 . 000 V 1 . 000 A

VOLT RANGE = HIGH ( : H / : L )

For Dual Channel models:

CH1 OFF5 . 000 V1 . 000 A

3. Models 9184B and 9185B do not have auto ranging

available. The range must be selected manually and can be

set as HIGH or LOW range.

9184B: HIGH range – 200 V / 1 A

LOW range – 100 V / 2 A

9185B: HIGH range – 600 V / 0.35 A

LOW range – 400 V / 0.5 A

To select HIGH range, press from the normal display

where VOLT RANGE is indicated.

OFF200 . 00 V 1 . 000 A

To select LOW range, press instead.

Note: The voltage setting range is dependent on the unit’s

maximum voltage output specification as well as the voltage limits set from the system menu. Verify VOLT LIMIT MAX and VOLT LIMIT MIN settings if you are unable to set a voltage within the specifications of the power supply.

VOLT RANGE = LOW ( : H / : L )

SET = 2.000 A

Iset

Enter

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OFF100 . 00 V 2 . 000 A

Setting Current

Follow the steps below to set the output current:

1. For single channel models, skip to step 2 below. For dual

channel models, from the main display press or

to select the channel for setting current. The channel

indicators CH1 or CH2 will flash to indicate the selected

channel.

2. With the main display shown, press and use the

numeric keypad to enter your set current. Then press .

Below is an example screen for setting 2 A.

OFF5 . 000 V 2 . 000 A

For Dual Channel models:

Note: The current setting range is dependent on the unit’s

maximum current output specification as well as the current limits set from the system menu. Verify CURR LIMIT MAX and CURR LIMIT MIN settings if you are unable to set a current within the specifications of the power supply.

SET = 2.000 A

CH2 OFF5 . 000 V 2 . 000 A

CH1 OFF5 . 000 V 2 . 000 A

3. Models 9184B and 9185B do not have auto ranging

available. The range must be selected manually and can be

set as HIGH or LOW range.

9184B: HIGH range – 200 V / 1 A

LOW range – 100 V / 2 A

9185B: HIGH range – 600 V / 0.35 A

LOW range – 400 V / 0.5 A

To select HIGH range, press from the normal display

To select LOW range, press instead.

Enable/Disable Output

WARNING:

Before connecting wires to the front or rear panel output terminals, output should remain OFF to avoid shocks and damage to the device under test (DUT), especially when setting the supply for high voltage output. For safety, load wires must have a wire gauge size large enough to prevent overheating when the power supply operates at maximum short circuit output current. It will also prevent large voltage drops from resistances in the wires.

OUTPUT

CH1

CH2

OUTPUT

The button is used to enable or disable the supply output

from both the front panel and the rear panel output terminals. A

green LED light next to the button will be lit when is

pressed to turn ON (enable), and the OFF annunciator will

disappear from the display. This will reappear when output is OFF

(disable) upon pressing again, and the green LED light

will disappear. For dual channel models, and are used

in place of as output ON/OFF for CH1 and CH2

respectively. Dual channel models can also be configured so that

both channels’ output states (ON or OFF) can be synchronized. See

“3.6Dual Channel Configurations” under “Multi/Single Output

Control” for setup instructions.

Controlling Voltage/Current Output with Keys

Note: The voltage setting range is dependent on the unit’s

maximum voltage output specification as well as the voltage limits set from the system menu. Verify VOLT

CH1CV

CH2CV5 . 000 V1 . 000 A

Enter

When the output is ON (enabled), the voltage (CV mode) or current

(CC mode) output can be controlled incrementally by key presses.

To do this, press or and a cursor will appear, highlighting the

last digit of the measured voltage or current display. Use or

to change and select the digit you want to change, and press

or to increase or decrease that digit. The output voltage or

current will change immediately as you change the digits. Press

at any time or allow the supply to idle for 10 seconds (without any

key presses) to go back to the normal display.

5 . 000 V1 . 000 A

For Dual Channel models:

5 . 000 V1 . 000 A

63 LIMIT MAX and VOLT LIMIT MIN settings if you are unable to set a voltage within the specifications of the power supply.

V SLEWRATE = _ 7.000 V / ms

CH1 V SLEWRATE = _ 7.000 V / ms

Enter

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Slew Rate Configuration

Voltage and current slew rate of the output can be configured by

doing the following:

1. Press , then to enter OUTPUT SETTING. Press

to select VOLT SLEWRATE SETTING. The following will be

displayed:

For Dual Channel models:

CH2 V SLEWRATE = _ 7.000 V / ms

2. Use the keypad to enter the voltage slew rate. (Refer to

Table 4) Then press the save the changes.

3. Press once to return to the previous menu items, and

Model

V Slew Rate (V/ms)

I Slew Rate (A/ms)

9171B

0.001 – 2.500

0.001 – 1.250

9172B

0.001 – 7.000

0.001 – 0.300

9173B

0.001 – 2.500

0.001 – 1.250

9174B

0.001 – 7.000

0.001 – 0.300

9181B

0.001 – 4.500

0.001 – 1.000

9182B

0.001 – 2.500

9183B

0.001 – 7.000

0.001 – 0.600

9184B

0.001 – 6.666

0.001 – 0.066

I SLEWRATE = _ 0.600 A / ms

CH1 I SLEWRATE = _ 0.600 A / ms

Enter

Esc

press to select CURR SLEWRATE SETTING. The

following will be displayed:

For Dual Channel models:

CH2 I SLEWRATE = _ 0.600 A / ms

4. Use the keypad to enter the current slew rate, then press

to save changes.

5. Press once to return to previous menu items, or press

three times to exit the menu when finished.

Table 4- Voltage and Current Slew Rate Ranges

9185B

0.001 – 15.00

0.001 – 0.0125

Output Timer Function

TIMER = OFF

Enter

Esc

The power supply has a built-in output timer function that can be

enabled to allow setting a time in which output is remained ON.

Follow the steps below to setup this function:

1. Press , then to select TIMER FUNCTION. The

following screen will be displayed:

TIME = 0 Hr 0 Min 0 Sec

2. While the cursor is selecting TIMER, press so that ON is

selected, then press to set and select TIME. This will

be the time for which the output will remain ON.

3. Use the numeric keypad to enter the Hr (hour) for the output

4. The acceptable ranges are:

5. Press once to return to previous menu items, or press

6. Upon returning to the main display, it will show the following:

to remain ON. Press to select Min (minute). Enter a

value and press again to select Sec (second).

Hr: 0 – 999, Min: 0 – 59, Sec: 0 – 59

three times to exit the menu when finished.

Note: For dual channel models, the timer function will work

only with both channels ON (enabled) simultaneously regardless of the OUTPUT MODE setting configured in SYSTEM SETTING menu. The internal timer is shared by both channels.

TIMER = 000 : 00 : 00 Sec

OFF10 . 000 V1 . 000 A

TIMER = 000 : 00 : 00 Sec

CH2OFF10 . 000 V1 . 000 A

OUTPUT

CH1

CH2

For Dual Channel models:

CH1OFF10 . 000 V1 . 000 A

7. Press ( or for dual channel models) to

turn the output ON, and the TIMER on the display will start

running. The ON annunciator will display, and the output will

remain ON until the configured time period (from step 3)

ends.

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Measurement Average Setting

AVERAGE TIME = _ 2

Enter

Esc

The averaging measurements used to display a reading can be

adjusted by following the steps below:

1. Press , then to enter OUTPUT SETTING. Press

to select MEASURE AVERAGE. The following will display:

2. Use the numeric keypad to enter the number of

measurements the instrument will average out prior to

displaying the value. Valid numbers are from 1 to 10.

3. Press to save changes, then press three times

to exit the menu.

3.6 Dual Channel Configurations

Features described in this section pertain to dual channel models

9173B and 9174B only. They are not available for all other models.

Multi/Single Output Control

Dual channel outputs can be configured so that pressing the output

buttons can turn ON (enable) or OFF (disable) both channels’

outputs simultaneously.

Note: When multiple output control is setup, there will be a maximum of 3

Enter

Esc

Enter

Esc

ms delay between channel 1 and channel 2 when both channels change

output from OFF (disable) state to ON (enable) state.

Follow the steps below to configure this setting:

1. Press , then to enter SYSTEM SETTING. Go

down the list of settings and select OUTPUT MODE.

2. Press to select MULTI. Press to confirm the

changes, and press twice to exit the menu. If SINGLE

is selected, output control of the two channels will not be

simultaneous; their output states can be controlled

independently.

Series/Parallel Tracking Mode

Tracking mode can be enabled so that both channels can be

synchronized, especially when connected together in series or

parallel. To turn on tracking mode, follow the steps here:

1. Press , then to enter SYSTEM SETTING. Go

down the list of settings and select TRACKING MODE.

2. Press to select ON. Press to confirm the changes,

and press twice to exit the menu. To disable it, select

OFF.

3. The TRK annunciator will appear on the display to indicate

TRK

CH2OFF 10 . 000 V 1 . 000 A

tracking mode is enabled. Both channels are now

synchronized.

CH1OFF 10 . 000 V 1 . 000 A

3.7 Remote Sense

Single channel models 9171B, 9172B, 9181B, 9182B, and 9183B

have both front and rear panel remote sense terminals. Dual

channel models 9173B and 9174B, and high voltage single channel

models 9184B and 9185B have rear panel remote sense terminals

only. Remote sense can be used to compensate for voltage drops

due to resistance from test leads connected to your device under

test (DUT), thus providing more accurate output voltage. The power

supply is initially setup to local sense mode by default. Refer to the

following sections for details of local and remote sense setup.

Local Sense

All power supplies are setup with local sense by default. In local

sense mode, shorting bars between the sense terminals and output

terminals are connected on the front panel (if available) and rear

panel outputs. Refer to Figure 16 below (Note: Some models do not

have front panel sense terminals, indicated by +S and -S):

For front panel, +S and + terminals are shorted together, and –S

Note: For calibration, local sense should be used.

+S + +

+S + - -S

Front Panel Shorting Bar

Rear Panel Shorting Bar

Figure 16-Local Sense with Shorting Bar

and – terminals are shorted together with shorting bars. For rear

panel, +S and + (next to +S) are shorted together, and –S and –

(next to –S) are shorted together with small metal shorting bars.

Remote Sense

To setup and use remote sense from the front panel (if available),

both the front panel and rear panel shorting bars must be removed.

The front +S and –S sense ports are then connected directly to the

DUT, like Figure 17 below:

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Figure 17- Front Panel Remote Sense Setup

WARNING:

In remote sense where both the front and/or rear panel shorting bars are removed, never connect a device directly to the front (if applicable) and/or back +S and –S terminals only. Always connect the + and – terminals first, then connect the +S and – S terminals. Otherwise, the sense lines will burn out internally and cause damage to the supply.

To use remote sense from the rear panel, both front panel (if

available) and rear panel shorting bars must also be removed. The

rear +S and –S ports are connected directly to the DUT, like Figure

18 below:

Figure 18- Rear Panel Remote Sense Setup

For operating with output current higher than 10 A, the connection is

DO NOT CONNECT LIKE BELOW:

the same as Figure 18 above, with the addition of connecting the

second pair of (+) and (-) terminals in the rear panel, like below:

WARNING:

DO NOT output 10A or more with only one pair of (+) and (-) terminals in the rear panel. Both (+) terminals and both (-) terminals must all be connected for applications requiring more than 10A output. Each terminal can only accept maximum of 10A. Exceeding this may damage the power supply.

+S + + - - - S

Rear Panel Output

Remove Shorting bars

- - S

DUT

+ -

+S + - -S

Remove shorting bars

Front Panel Output

Rear Panel Output

Figure 19- Remote Sense Setup for 10A or Higher Current Output Operation

LED MODE = ON

Enter

Esc

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3.8 LED and Low Current Test Modes

LED Mode

All of these power supplies have LED mode, which enables them to

function specifically for LED test applications. When this mode is

ON (enabled), the power supply can operate in such a way as to

minimize or almost eliminate the inrush current drawn by the LED

load, which normally exists when the output switches from an OFF

state to an ON state.

To enable LED mode, follow these steps:

1. Press , then to enter OUTPUT SETTING. Press

to select LED MODE SETTING.

2. Press to select ON, then press to confirm the

changes. Press twice to exit the menu. For dual

channel models, both channels will have LED mode enabled.

Consider the following example for 9184B with setup in Figure 20:

The 9184B supply output is initially OFF (disabled). The LED light

Inrush current

LED Mode OFF (disabled)

LED Mode ON (enabled)

Output ON

Figure 20- LED Testing Example

Figure 21 - Inrush Current With and Without LED Mode Enabled

bar is rated for 170 V. A 10 Ω resistor is placed in series with the

LED light bar. The power supply current setting (ISET) is 20 mA.

Using an oscilloscope to probe between the resistor to measure

current, the power supply’s output is then turned ON. The measured

results are shown in Figure 21, which compares the measured

results with and without LED mode ON (enabled):

With LED mode ON (enabled), the power supply can minimize or

Note: For LED mode to function correctly, the output must be turned

OFF when connecting between the power supply and the LEDs under test. Turn ON the output after LED mode is enabled and all other settings are configured.

WARNING:

For models 9184B and 9185B, Low Current MODE must be set to OFF when using LED mode. If both are ON, the supply may produce inrush current.

eliminate any inrush current from turning the output ON, which in

turn will minimize damage or life of the LEDs under test.

Low Current Mode

Available on models 9184B and 9185B only.

Low current mode is a unique function that enables the power

supply to minimize voltage rise times when operating with low

current (< 1 A) output with a high voltage change.

To enable Low current mode, follow these steps:

1. Press , then to enter OUTPUT SETTING. Press

to select Low Current MODE.

2. Press to select ON, then press to confirm the

LED MODE = OFF Low Current MODE = ON

Low Current Mode OFF

Low Current Mode ON

20 ms

5 ms

Figure 22 - Inrush Current With and Without Low Current Mode Enabled

Enter

Esc

changes. Press twice to exit the menu.

Consider the following example screenshots measuring a voltage

chance from 0 V to 60 V with a load of 100 mA connected to the

output.

When operating with low current output, enabling Low Current mode

can reduce the voltage rise time upon a change in the voltage

output.

OVP = ON SET = 70.000 V

CH1 OVP = ON SET = 70.000 V

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3.9 Output Protection

Configure OVP

Overvoltage protection (OVP) is available to limit the voltage output

and to protect a connected DUT from an overvoltage condition.

When the power supply trips the OVP, a short beep will sound and

the OVP (OVP1/OVP2 for dual channel models) LED indicator on

the front panel will be lit. The green output light will also disappear

and output will turn OFF (disable) immediately. To clear the OVP

trip, press any key and the OVP (OVP1/OVP2 for dual channel

models) LED indicator will turn OFF. To activate OVP, follow the

steps below:

1. Press , then to enter PROTECTION, and press

to select OVP SETTING.

For Dual Channel models:

CH2 OVP = OFF SET = 70.000 V

2. Press to select ON. Press to confirm the changes,

OCP = ON SET = 10.000 A

Enter

Esc

Enter

and use the numeric keypad to set the voltage limit for the

protection to trip. Press again to save changes. When

the power supply voltage output reaches this limit, the OVP

will trip.

3. Press twice to exit the menu. To disable it, select

OFF.

Configure OCP

Overcurrent protection (OCP) is available to limit the current output

and to protect a connected DUT from an overcurrent condition.

When the power supply trips the OCP, a short beep will sound and

the OCP (OCP1/OCP2 for dual channel models) LED indicator on

the front panel will be lit. The green output light will also disappear

and output will turn OFF (disable) immediately. To clear the OCP

trip, press any key and the OCP (OCP1/OCP2 for dual channel

models) LED indicator will turn OFF. To activate OCP, follow the

steps below:

1. Press , then to enter PROTECTION, and press

to select OCP SETTING.

For Dual Channel models:

CH1 OCP = ON SET = 10.000 A

Enter

Esc

Enter

CH2 OCP = OFF SET = 10.000 A

2. Press to select ON. Press to confirm the changes,

and use the numeric keypad to set the current limit for the

protection to trip. Press again to save changes. When

the power supply current output reaches this limit, the OCP

will trip.

3. Press twice to exit the menu. To disable it, select

OFF.

3.10 Save/Recall Output Settings

The power supply has internal memory to store up to 10 settings,

and each setting includes the set voltage (VSET) and set current

(ISET) values.

Save Output Settings

MEM = 0 V = 0.000 V I = 0.000 A

MEM = 0 CH1 V = 0.000 V I = 0.000 A

CH2 V = 0.000 V I = 0.000 A

Enter

Follow these steps to save settings:

1. Press , then to enter MEMORY SETTING. The

following screen will be displayed:

For Dual Channel models:

2. Press or or use the keypad to select the memory

location to store settings into. Choose between 0 – 9.

3. Press to set, and use the keypad to enter a value for

voltage. Afterwards, press and enter a value for

current ess once more and the voltage and current

values will be stored into the selected memory location.

4. The cursor will then automatically move back to select MEM,

and the location number will automatically increment to the

next, except if number 9 (last memory location) was

previously selected.

RECALL =

OFF 0.000 V 0.000 A

RECALL =

CH2OFF 10 . 000 V 1 . 000 A

RCL

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5. For dual channel models, repeat step 3 twice, once for CH1

and for CH2. Each memory location will store both channels’

voltage and current settings.

Recall Output Settings

To recall a saved setting:

1. Press the screen will display as follows:

For Dual Channel models:

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CH1OFF 10 . 000 V 1 . 000 A

2. Use the keypad to enter the memory location that contains

the voltage and current values to recall. The voltage and

current settings will change immediately to the recalled

settings.

Configure Power-On State

The power supply can be powered up to a last known state, which

can be useful in the case of power interruption. To configure this,

follow the steps below:

1. Press , then to enter SYSTEM SETTING. Select

Enter

POWER ON STATE. Press or to change it to LAST

for setting the power on state to last known configuration.

Select OFF to turn it off.

2. Press to confirm the change.

3.11 Sequence Program Mode

Up to 10 (1 – 10) programmed sequences can be stored into the

internal memory of the power supply and be executed from the front

panel or via remote commands. A sequence consists of various

steps of voltage and current values with a user defined time to hold

at each step. This allows the user to change the voltage and current

output of the power supply at different timings in a sequence. The

maximum number of steps per sequence is 150, and the

minimum timing in between steps is 10 ms. For dual channel

models, the programmed sequence will control both channels

per every step. Programming a sequence for each channel

independently is not supported.

Sequences must be programmed into the memory via remote

interface (i.e. USB, GPIB, Ethernet) before it can be executed from

the front panel. See “4 Remote Operation” for details.

Assuming that sequences are already programmed into the internal

memory, follow these steps to execute a program.

1. Press , then to enter PROGRAM MODE. The

PROGRAM NUMBER = 0

PROGRAM OFF

Enter

OUTPUT

CH1

CH2

OUTPUT

CH1

CH2

following screen will be displayed:

2. Use the keypad to select the program number where the

sequence is stored. Valid number is 1 – 10. Press to

confirm the program.

3. Press ( or for dual channel models) to

enable the output and execute the programmed sequence.

For dual channel models, both outputs will turn ON.

4. To disable the sequence at any time, press

( or for dual channel models) again. This will also

turn OFF the output. For dual channel models, both outputs

will be OFF.

3.12 External Analog Control

The power supply output(s) can be controlled by external DC voltage

sources (0 – 5 V or 0 – 10 V) or resistances (0 – 5kΩ). The

optional DIO/Analog Card must be installed for this function to

be available.

Note: The external control circuit uses a 12-bit D/A converter, thus

resolution for voltage and current is limited to 10 mV and 10 mA respectively.

WARNING:

The terminals for external analog control of voltage and current have no input protection. Therefore take caution when connecting to a DC source or a resistance. For voltage source control, do not input a voltage outside of the range -0.7 V to 5.7 V for the 0-5 V scale, or -0.7 V to 10.7 V for 0-10 V scale. This will damage the supply. For resistance control, do not connect with resistance greater than 5 kΩ. Doing so may damage the instrument and cause it to go out of calibration.

WARNING:

External analog control inputs do not have reverse polarity protection. Therefore, for external voltage control, do not connect to a live DC source until verifying that the positive side is connected properly to the (+) terminal and negative side to the (-) terminal for both current and voltage. Never short the (+) and (-) terminals together as it may damage the instrument.

Voltage Control

You can select the voltage control scale between 0 – 5 V or 0 – 10 V,

with 5 V and 10 V setting the maximum voltage/current output

respectively, and 0 V being the minimum voltage/current output,

which is 0 V/0 A(The scale factor is linear to the full scale

voltage/current output). With model 9172B (rated 35V/3A, 70V/1.5A)

as an example, using the 0 – 10 V scale and applying 0 V input for V

Note: Two separate DC voltage sources must be used for the setup.

One for controlling voltage and one for current. Using one for either voltage or current will not operate correctly. If source is used for voltage, current setting will remain 0. If source is used for current, voltage setting will remain 0.

+- +

EXT CTL

Dual channel DIO/Analog Card

Single channel DIO/Analog Card

+ -

0 – 5 V

0 – 10 V

0 – 5 V

0 – 10 V

Figure 23- External Voltage Control

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will output 0 V. Applying 10 V input for V will output 35 V or 70 V

depending on the range. Likewise, 10 V for I will set current to 3A or

1.5 A depending on the range. See the setup below:

Resistance Control

You can externally control the voltage/current output with variable

resistances 0 – 5 kΩ. 5kΩ sets the maximum voltage/current output,

and 0 kΩ will set the minimum voltage/current output, which is 0 V/0

Note: Two separate variable resistances must be used for the setup.

One for controlling voltage and one for current. Using one for either voltage or current will not operate correctly. If resistance is used for voltage, current setting will remain 0. If resistance is used for current, voltage setting will remain 0.

+- +

EXT CTL

Dual channel DIO/Analog Card

Single channel DIO/Analog Card

0 – 5 kΩ

Figure 24- External Resistance Control

A (The scale factor is linear to the full scale voltage/current output).

See the setup below:

Follow the steps below to setup the supply for external analog

control:

1. Press , then to enter SYSTEM SETTING.

OFF

Enter

Esc

2. Go down to EXTERN CONTROL (this option is only

available with DIO/Analog Card installed) and press or

to select between OFF, VOLT, or RES. Select VOLT

for external voltage control or RES for external resistance

control. Select OFF to disable external analog control.

3. Press to save the change. If VOLT is selected in the

previous step, go to EXTERN LEVEL setting right below

EXTERN CONTROL and press or to select

between 5V or 10V. Selecting 5V means a 0 – 5V source

will be used to control the full range of the voltage/current.

Similarly, 10V means a 0 – 10V source will be used.

4. Press again to save the change, and press twice

to go to the main screen, which will look like the following

below (Note that voltage and current resolution will be 10 mV

and 10 mA for external analog control):

0.00 V 0.00 A

For Dual Channel models:

Note: When external analog control is enabled, all front panel keys are

locked except for and ( or for dual channel models). Output voltage and current is locked to be controlled with the connected external voltage sources or resistances only. To return to normal control and display mode, follow the steps above to disable external analog control.

CH1OFF 0.00 V 0.00 A

CH2OFF 0.00 V 0.00 A

OUTPUT

CH1

CH2

OUTPUT

5. Press to turn the output ON (enabled), and output

voltage and current will change as your external DC voltage

sources or resistances change.

3.13 Digital I/O

Digital I/O functions are supported with the DIO/Analog card

installed.

The instrument uses a DB-9 9-pin interface for digital I/O operations.

A total of 9 pins are available, 8 of which can be configured as

INPUT or OUTPUT and 1 for ground (GND) via remote commands

(Refer to Table 5). The maximum voltage for input is 5 V, and

maximum voltage for output from the supply is also 5 V.

Pin#

9 8 7 6 5 4 3 2 1

Type

I/O

GND

I/O

Binary Bit #

7 6 5 4 - 3 2 1 0

Decimal

Representation

128

16 8 4 2 1

I/O – Can be set to either input or output. GND – Ground pin

Dual Channel DIO/Analog Card

Single Channel DIO/Analog Card

1 2 3 4 5 6 7 8 9

Figure 25- Digital I/O Interface

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Below are the pin assignments for each of the 9 pins.

Table 5- Digital I/O Pin Assignment

WARNING:

Do not input more than 5 V to any of the digital I/O pins. Doing so may damage the instrument and void its warranty.

INPUT

9 8 7 6 5 4 3 2 1

1 1 0 1 - 0 1 0 0

Digital input for representing logic high (1) is 5 V, and for logic low

(0) is 0 V.

Minimum voltage for logic high (1) must be at least 3.15 V.

Maximum voltage for logic low (0) must not exceed 1.35 V.

To setup any of the 8 pins (except pin 5) as input pins, the remote

command GPIO:DIR is used. All pins (except pin 5) are represented

as 8-bits binary, according to Table 5 above. A “1” represents

OUTPUT, and a “0” represents INPUT. When using the GPIO:DIR

command, the decimal representation of the 8-bits binary is used.

For example, to set pins 7, 4, 2 and 1 as INPUT pins, their values

must be set to 0, and the rest 1. Send:

GPIO:DIR 212

212 is used to represent11010100 in binary. Only pins 7, 4, 2, and 1

have the value “0”, which represents INPUT.

To check the status of the input pins to be either 5 V (1) or 0 V (0),

use the GPIO? query command. It will return the decimal

9 8 7 6 5 4 3 2 1 0 0 0 0 - 0 0 1

representation of the 8-bits binary that represents all the pins. The

pins with bit value “1” have 5 V at the input, and “0” for 0 V at input.

For example, suppose all pins are set as INPUT pins, but only pin 2

and 1 have a 5 V logic high (1) signal, then only these two pins

return “1” and the rest “0”. Sending GPIO? command will return: 3.

The complete 8-bit binary would be 00000011.

Note if there are output pins configured, those pins are ignored and

will have the value “0”.

OUTPUT

To setup any of the 8 pins (except pin 5) as output pins, the remote

command GPIO:DIR is used. All pins (except pin 5) are represented

as 8-bits binary, according to Table 5 above. A “1” represents

OUTPUT, and a “0” represents INPUT. When using the GPIO:DIR

command, the decimal representation of the 8-bits binary is used.

For example, to set pins 8, 6, and 3 as OUTPUT pins, their values

must be set to 1, and the rest 0. Send:

GPIO:DIR 84

84 is used to represent 01010100 in binary. Only pins 8, 6, and 3

have the value “1”, which represents OUTPUT.

9 8 7 6 5 4 3 2 1 0 1 0 1 - 0 1 0

9 8 7 6 5 4 3 2 1 0 1 0 0 - 0 1 0

Error Message

Description

Digital output for representing logic high (1) is 5 V, and for logic low

(0) is 0 V. To set an output pin’s logic level, use the GPIO remote

command. Again, all pins (except pin 5) are represented as 8-bits

binary, according to Table 5 above. When using the GPIO

command, the decimal representation of the 8-bits binary is used.

Taking the example above with pins 8, 6, and 3 set as OUTPUT

pins, if pins 8 and 3 are to be set with logic high (5 V) and pin 6 set

with logic low (0 V), send the following command:

GPIO 68

68 is used to represent 01000100 in binary. Only pins 8 and 3 have

the value “1” to represent logic high and output 5 V. Pin 6 has the

value “0” to represent logic low and output 0 V. All other pins should

be “0” as they are input pins and thus, are ignored.

3.14 Display Errors

The following errors may be displayed under certain operating

conditions. Their descriptions are shown in the table below.

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INPUT RANGE ERROR!

TURN OFF OUTPUT FIRST

The input value is out of the settable range of the power supply. Disable output first before accessing menu.

3.15 Connecting in Series and Parallel

Some of the models in the series are capable of connecting to

another model of the same kind in series or in parallel to double the

voltage output or current output respectively. While these are

possible for some models, some models cannot be connected in

such a way. Please see the below list of warnings pertaining to such

connections.

WARNING:

 Do not connect multiple units of models 9184B or 9185B

in series or in parallel. Due to their high voltage output design, these cannot be configured to increase voltage or current in a series connection or parallel connection setup respectively.

 Only connect multiples units in series or parallel of the

same model. Do not mix models together. For example, you can connect two 9171B together, but not 9171B and 9172B together.

 Do not connect more than 2 units of models 9174B when

series/parallel tracking is used.

 Do not connect more than 3 units of models 9172B and

9183B.

 Never connect more than 4 units at a time in series or

parallel.

 Total voltage output can never exceed maximum 240 V.  Do not use rear output terminals when connecting

multiple units in series or in parallel. Use front panel output terminals only.

 When increasing the total output current by connecting

multiple units in parallel, be sure that the connecting wires have enough thickness to handle the amount of current. Otherwise, they may overheat and/or drop voltage levels significantly.

4 Remote Operation

1 2 3 4 5

7 8 9

Figure 26- RS-232 Interface

4.1 Interface Connection

USB (Virtual COM) & RS-232

All models have a standard USB interface (virtual COM) that can be

used for remote communication. Optionally, an RS232 interface

card is available for remote control via RS-232 interface. Both USB

(virtual COM) and RS-232 have the same serial settings listed

below:

BAUDRATE: 57600

PARITY: NONE

DATA BITS: 8

STOP BIT: 1

FLOW CONTROL: NONE

For RS-232 connectivity, refer to the diagram below for pin out

information:

Table 6- RS-232 Pin Out

Description

1 - 2

Transmit Data

Receive Data

4 - 5

GND 6 -

7 - 8 - 9

Figure 27- GPIB Interface

A straight pin-to-pin DB9female to DB9male serial cable is

required for using RS-232 interface. Do not use a null modem

or crossover DB9 serial cable.

GPIB

GPIB option is available when the supply is installed with the

optional LAN/GPIB interface card. Each model can be configured

with a GPIB address from 1 – 30. To communicate via GPIB,

connect a GPIB cable to the GPIB interface of the LAN/GPIB

interface card, as illustrated below.

Ethernet (LAN)

Ethernet (LAN) option is available when the supply is installed with

the optional LAN/GPIB interface card. There are three ways to

control the power supply via LAN interface: Web server, Telnet

connection, Socket connection.

Web Server

There is an embedded web server GUI that can access the power

supply via LAN interface using a java enabled web browser. The

GUI provides a simple way of setting voltage and current, as well as

monitoring the output, using a web browser from a computer

connected to the same local area network as the power supply. To

access this, do the following:

1. On the computer, open up a java-enabled web browser.

2. From the power supply menu, copy down the IP ADDRESS

that you or the server configured and type in that address in

the URL bar of your browser with http:// prefix (i.e.

http://192.168.1.150 for IP Address 192.168.1.150)

3. If correctly configured, the following screen will be shown:

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4. A password is required to login and access any of the menu

Home

Provides general information of the power supply:

Model Number, Manufacturer, Short Description, MAC Address, IP Address, Firmware Version.

Configuration

Allows users to configure: OVP Setting, OCP Setting, LCD Backlight, *Change Password.

*Be sure to remember the new password if changed because it cannot be override.

Status

Shows last error or warning messages from the power supply. It should normally be 0, which means no

error(s).

Web Control

Allows the user to manually send remote commands (see “4Remote Operation” for details) and control:

91XXB

items on the page.

DEFAULT ADMIN PASSWORD: 123456

Menu Items

This table describes each of the menu items available on the left

frame of the web browser GUI.

Table 7- Web Browser Menu Description

100

BK Precision BK Precision 9172B-220V Manual

Specifications and Main Features

Frequently Asked Questions

User Manual