BK Precision BK Precision 9240 Manual

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Multi-Range DC Power Supplies

User Manual

9240 Series

2

Safety Summary

The following safety precautions apply to both operating and maintenance personnel and must be followed during all
phases of operation, service, and repair of this instrument.

Before applying power to this instrument:

• Read and understand the safety and operational information in this manual.

• Apply all the listed safety precautions.

• Verify that the voltage selector at the line power cord input is set to the correct line voltage. Operating the instrument
at an incorrect line voltage will void the warranty.

• Make all connections to the instrument before applying power.

• Do not operate the instrument in ways not specied by this manual or by B&K Precision.

Failure to comply with these precautions or with warnings elsewhere in this manual violates the safety standards of design,
manufacture, and intended use of the instrument. B&K Precision assumes no liability for a customer’s failure to comply
with these requirements.

Category rating

The IEC 61010 standard denes safety category ratings that specify the amount of electrical energy available and the
voltage impulses that may occur on electrical conductors associated with these category ratings. The category rating is
a Roman numeral of I, II, III, or IV. This rating is also accompanied by a maximum voltage of the circuit to be tested,
which denes the voltage impulses expected and required insulation clearances. These categories are:

Category I (CAT I): Measurement instruments whose measurement inputs are not intended to be connected to the

mains supply. The voltages in the environment are typically derived from a limited-energy trans­former or a battery.

Category II (CAT II): Measurement instruments whose measurement inputs are meant to be connected to the mains

supply at a standard wall outlet or similar sources. Example measurement environments are portable
tools and household appliances.

Category III (CAT III): Measurement instruments whose measurement inputs are meant to be connected to the mains

installation of a building. Examples are measurements inside a building’s circuit breaker panel
or the wiring of permanently-installed motors.

Category IV (CAT IV): Measurement instruments whose measurement inputs are meant to be connected to the primary

power entering a building or other outdoor wiring.

Do not use this instrument in an electrical environment with a higher category rating than what is specied in this manual
for this instrument.

3

You must ensure that each accessory you use with this instrument has a category rating equal to or higher than the
instrument’s category rating to maintain the instrument’s category rating. Failure to do so will lower the category rating
of the measuring system.

Electrical Power

This instrument is intended to be powered from a CATEGORY II mains power environment. The mains power should be
115 V RMS or 230 V RMS. Use only the power cord supplied with the instrument and ensure it is appropriate for your
country of use.

Ground the Instrument

To minimize shock hazard, the instrument chassis and cabinet must be connected to an electrical safety ground. This
instrument is grounded through the ground conductor of the supplied, three-conductor AC line power cable. The power
cable must be plugged into an approved three-conductor electrical outlet. The power jack and mating plug of the power
cable meet IEC safety standards.

Do not alter or defeat the ground connection. Without the safety ground connection, all accessible conductive parts
(including control knobs) may provide an electric shock. Failure to use a properly-grounded approved outlet and the
recommended three-conductor AC line power cable may result in injury or death.

Unless otherwise stated, a ground connection on the instrument’s front or rear panel is for a reference of potential only
and is not to be used as a safety ground. Do not operate in an explosive or ammable atmosphere.

Do not operate the instrument in the presence of ammable gases or vapors, fumes, or nely-divided particulates.

The instrument is designed to be used in oce-type indoor environments. Do not operate the instrument

• In the presence of noxious, corrosive, or ammable fumes, gases, vapors, chemicals, or nely-divided particulates.

• In relative humidity conditions outside the instrument’s specications.

• In environments where there is a danger of any liquid being spilled on the instrument or where any liquid can condense
on the instrument.

• In air temperatures exceeding the specied operating temperatures.

• In atmospheric pressures outside the specied altitude limits or where the surrounding gas is not air.

4

• In environments with restricted cooling air ow, even if the air temperatures are within specications.

• In direct sunlight.

This instrument is intended to be used in an indoor pollution degree 2 environment. The operating temperature range is
0∘C to 40∘C and 20% to 80% relative humidity, with no condensation allowed. Measurements made by this instrument
may be outside specications if the instrument is used in non-oce-type environments. Such environments may include
rapid temperature or humidity changes, sunlight, vibration and/or mechanical shocks, acoustic noise, electrical noise,
strong electric elds, or strong magnetic elds.

Do not operate instrument if damaged

If the instrument is damaged, appears to be damaged, or if any liquid, chemical, or other material gets on or inside the
instrument, remove the instrument’s power cord, remove the instrument from service, label it as not to be operated,
and return the instrument to B&K Precision for repair. Notify B&K Precision of the nature of any contamination of the
instrument.

Clean the instrument only as instructed

Do not clean the instrument, its switches, or its terminals with contact cleaners, abrasives, lubricants, solvents, acids/bases,
or other such chemicals. Clean the instrument only with a clean dry lint-free cloth or as instructed in this manual. Not
for critical applications

This instrument is not authorized for use in contact with the human body or for use as a component in a life-support
device or system.

Do not touch live circuits

Instrument covers must not be removed by operating personnel. Component replacement and internal adjustments must
be made by qualied service-trained maintenance personnel who are aware of the hazards involved when the instrument’s
covers and shields are removed. Under certain conditions, even with the power cord removed, dangerous voltages may
exist when the covers are removed. To avoid injuries, always disconnect the power cord from the instrument, disconnect
all other connections (for example, test leads, computer interface cables, etc.), discharge all circuits, and verify there
are no hazardous voltages present on any conductors by measurements with a properly-operating voltage-sensing device
before touching any internal parts. Verify the voltage-sensing device is working properly before and after making the
measurements by testing with known-operating voltage sources and test for both DC and AC voltages. Do not attempt
any service or adjustment unless another person capable of rendering rst aid and resuscitation is present.
Do not insert any object into an instrument’s ventilation openings or other openings.

Hazardous voltages may be present in unexpected locations in circuitry being tested when a fault condition in the circuit
exists.

5

Fuse replacement must be done by qualied service-trained maintenance personnel who are aware of the instrument’s fuse
requirements and safe replacement procedures. Disconnect the instrument from the power line before replacing fuses.
Replace fuses only with new fuses of the fuse types, voltage ratings, and current ratings specied in this manual or on
the back of the instrument. Failure to do so may damage the instrument, lead to a safety hazard, or cause a re. Failure
to use the specied fuses will void the warranty.

Servicing

Do not substitute parts that are not approved by B&K Precision or modify this instrument. Return the instrument to
B&K Precision for service and repair to ensure that safety and performance features are maintained.

For continued safe use of the instrument

• Do not place heavy objects on the instrument.

• Do not obstruct cooling air ow to the instrument.

• Do not place a hot soldering iron on the instrument.

• Do not pull the instrument with the power cord, connected probe, or connected test lead.

• Do not move the instrument when a probe is connected to a circuit being tested.

Compliance Statements

Disposal of Old Electrical & Electronic Equipment (Applicable in the European Union and other European
countries with separate collection systems)

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.

Safety Symbols

Symbol Description

Indicates a hazardous situation which, if not avoided, will result in death or serious injury.

Indicates a hazardous situation which, if not avoided, could result in death or serious injury

Indicates a hazardous situation which, if not avoided, will result in minor or moderate injury

Refer to the text near the symbol.

Electric Shock hazard

Alternating current (AC)

Chassis ground

Earth ground

Indicates the In position of the power switch when instrument is ON.

6

Indicates the Out position of the power switch when instrument is OFF.

Indicates practices not related to physical injury.

Table 1 Safety Symbols

Contents

1 Introduction 10

1.1 Product Overview 10

1.2 Contents 10

1.3 Features 11

1.4 Dimensions 11

1.5 Rackmount Installation 12

1.6 Front Panel 13

1.7 Display 14

1.8 Rear Panel 15

2 Getting Started 16

2.1 Input Power and Fuse Requirements 16

2.2 Fuse Requirements 17

2.3 Check or Replace Fuse 17

2.4 Preliminary Check 19

2.5 Self test Errors 20

3 Basic Front Panel Operation 21

3.1 Keys 21

3.1.1 Function Keys 21

3.1.2 Soft Keys 21

3.1.3 Numeric Keys 21

3.1.4 Output Control 22

3.2 Display 23

3.3 Check Model and Firmware Version 25

3.4 Setting Voltage and Current 25

4 Output Conguration 26

4.1 Protection Settings 26

4.1.1 Over Voltage Protection (OVP) 26

4.1.2 Over Current Protection (OCP) 26

4.1.3 Over Temperature Protection & Over Temperature Warning (OTP & OTW) 26

4.1.4 Vmax/Vmin 26

4.1.5 Protection Clear 27

4.2 Output Settings 27

4.2.1 Remote Sense 27

4.2.2 Output Timer 28

4.2.3 Voltage Slew 28

4.2.4 Current Slew 28

4.2.5 On/O Delay 29

5 List Mode 30

5.1 List Setup 30

5.2 Edit List 32

5.2.1 Load/Save List 32

5.2.1 List Number 33

5.2.2 Next 33

5.2.3 Repeat 34

5.2.4 Steps 34

5.3 List Run 36

8

6 Battery Charge Function 38

6.1 Charge Test 38

6.1.1 Start/Stop Test 38

6.1.2 Save/Load Prole 38

6.1.3 V Full 39

6.1.4 I Limit 39

6.1.5 I End 40

6.1.6 End Delay 40

6.2 Battery Test Settings 40

6.2.1 Sampling Time 40

6.2.2 A-h On/O 40

6.2.3 W-h On/O 40

6.2.4 Trigger Source 41

6.2.5 File Path 41

6.2.6 T. Stamp Filename 42

6.3 Fail Safe Settings 42

6.3.1 Fail State 42

6.3.2 Stop Time 42

6.3.3 Stop Ah 43

6.3.4 Stop Wh 43

6.3.5 Over Voltage Protection (OVP) 43

7 Data Logger 44

7.1 Using the Data Logger Function 44

7.2 Parameters 45

7.2.1 Sampling Interval 45

7.2.2 File Path 45

7.2.3 T. Stamp Filename 45

7.2.4 Log Data 46

7.2.5 Status Code 47

7.2.6 Trigger Source 47

7.2.7 Datalog Start/Stop 47

8 Utilities Menu 48

8.1 User Settings 48

8.1.1 Key Lock Output 48

8.1.2 Beep Sound 48

8.1.3 Date 48

8.1.4 Time 49

8.1.5 Screen Intensity 49

8.1.6 Language 49

8.2 Remote Interface 49

8.2.1 USB Settings 50

8.2.2 LAN 51

8.3 GPIB (optional) 56

8.4 Digital I/O 57

8.4.1 Functions 57

8.4.1 Polarity 58

8.4.1 Inhibit Mode 59

8.5 Test/Admin 60

8.5.1 Self Test 60

8.5.2 Security 60

8.6 Error Log 62

8.7 Help 63

8.8 On Screen Help 63

9 Key Lock 64

9

10 Save/Recall 65

10.1 Save the Output Settings 65

10.2 Recall the Instrument’s Settings 66

10.3 Power-On Settings 67

10.4 Screenshot 68

11 Calibration Adjustment Procedure 69

11.1 Voltage Calibration Adjustment 70

11.2 Current Calibration Adjustment 71

11.3 OVP Calibration Adjustment 72

11.4 OCP Calibration Adjustment 73

11.5 RTC Calibration Adjustment 74

12 Performance Verication 75

13 Specications 78

14 Service Information 81

15 LIMITED THREE-YEAR WARRANTY 82

Introduction

1.1 Product Overview

9240: 32 V / 8 A / 120 W 9241: 60 V / 4 A / 120 W

Figure 1.1 Front View

The 9240 series multi-range DC power supplies combine industry-leading power density and performance with an extensive
set of features in a compact 2U form factor.

The series produces 120/200 W of clean power with exceptionally low ripple and noise characteristics. An advanced list
mode programming, data logging, battery charging and protection features make these power supplies suitable for a wide
range of benchtop or test system applications.

Model 9240 9241 9242

Voltage Range 0 to 32 V 0 to 60 V 0 to 60 V
Current Range 0 to 8 A 0 to 4 A 0 to 10 A

Maximum Power 120 W 200 W

Table 1.1 Models

1.2 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:

• 1 x 9240, 9241, or 9242 Power Supply

• 1 x AC Power Cord

• 1 x Certicate of Calibration

• 1 x Test Report

Note:

Ensure the presence of all the items above. Contact the distributor or B&K Precision if anything is missing.

Introduction 11

1.3 Features

• Compact 2U half-rack form factor

• Multi-ranging operation delivers rated power at various voltage/current combinations

• Advanced list mode programming with internal storage for up to 10 list mode programs and list sequencing capabilities

• Digital I/O block oers external triggering, voltage fault and remote inhibit capabilities

• Battery Charge Function

• Overvoltage protcetion (OVP), overcurrent (OCP), over temperature (OTP), and includes a key-lock function

• NISPOM-compliant sanitization procedure to securely erase and return the instrument to factory settings

• USB (USBTMC-compliant) and LXI compliant LAN interfaces standard, GPIB optional

• LabVIEW

𝑇 𝑀

, IVI-C, and IVI.NET drivers provided

1.4 Dimensions

The 9240 Series dimensions are approximately:
213 mm (8.4 in) x 88.2 mm (3.47 in) x 330 mm (13 in) (W x H x D).

Figure 1.2 Dimensions

Introduction 12

1.5 Rackmount Installation

The 9240 Series is compatible with the optional 19-inch rackmount kit model RK2US. The RK2US installation instructions
can be downloaded from bkprecision.com

Figure 1.3 Dimensions

1.6 Front Panel

The front panel interface allows for control of the unit.

Introduction 13

Figure 1.4 Front Panel

Item Name

1 Power Button Power the instrument ON or OFF

2 Function Keys See section 3.1.1 for details.

3 USB Host Port USB port used to connect ash drives.

4 Display Visual presentation of the device function and measurements.

5 Numeric Keypad Used to enter precise values.

6 Rotary Knob Used to navigate menues or congure parameters.

7 Output/Sense

8 Soft Keys Used to invoke any functions displayed above them.

Description

Isolated and oating output channel supporting sheathed banana plugs and
spade lug type connectors

Table 1.2 Front Panel

1.7 Display

Introduction 14

Icon

Description

The output is disabled.

The output is enabled and in constant voltage mode

The output is enabled and in constant current mode

Data loggin is enabled but not recording.

Data logging is enabled and recording.

The instrument is connected to a network.

An issue occured when attempting to connect to a network.

The instrument is not connected to a network.

All keys excluding softkey F6 are locked.

Over voltage protection was triggered.

Over current protection was triggered.

Over temperature protection was triggered.

The instrument is set to remote mode

Remote sense is enabled.

Remote

Table 1.3 Display Icons

1.8 Rear Panel

Introduction 15

Figure 1.5 Rear Panel

Item Name

1 Output/Sense

2 Kensington security slot

3 GPIB Interface (Optional) Connect a GPIB cable to remotely control the unit `

4 Digital I/O Send or receive a signal to or from an external device.

5 USB interface Connect a USB type B to type A to remotely control the unit.

6 LAN interface

7 Chassis ground

8

AC power input

& fuse box

Description

Rear panel output with remote sense. Internal relays switch between local and
remote sensing.

Lock the instrument to a xed location using the security lock via the lock hole.
Lock is not included.

Connect a Cat 5/6 Ethernet straight-through patch cable to remotely control
the unit.

Provides a zero potential voltage reference and a dissipation point for interfer­ence, transient voltages and static.

Houses the fuse as well as the AC input.

Table 1.4 Rear Panel

Getting Started

Before connecting and powering up the instrument, please review and go through the instructions in this chapter.

2.1 Input Power and Fuse Requirements

The supply has a universal AC input that accepts line voltage input within:

9240 9241 9242

AC Line Input 100 - 240 VAC±10%, 47 to 63 Hz

AC Line Phase Single Phase

Maximum Rated

Input Power

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 sucient circuit capacity for the power supply. Once veried, connect the cable rmly.

The included AC power cord is safety certied 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.

200 VA 300 VA

SHOCK HAZARD

The power cord provides a chassis ground through a third conductor. Verify that your power

outlet is of the three-conductor type with the correct pin connected to earth ground.

Getting Started 17

2.2 Fuse Requirements

An AC input fuse is necessary when powering the instrument. The below table shows the fuse required for all models.

Model Fuse Specication

9240 3.15 AT, 250 V

9241 3.15 AT, 250 V

9242 4 AT, 250 V

2.3 Check or Replace Fuse

For safety, no power should be applied to the instrument while changing line voltage

operation. Disconnect all cables connected to the instrument before proceeding.

– Locate the fuse box next to the AC input connector in the rear panel. (See gure 1.5)

– Insert a small athead screwdriver into the fuse box slit to pull and slide out the fuse box as indicated below.

– Check and replace fuse if necessary. (See gure 2.1)

Figure 2.1 Fuse Removal

Any disassembling of the case or changing the fuse not performed by an

authorized service technician will void the warranty of the instrument

SHOCK HAZARD:

Hazardous voltages may exist at the outputs and the load connections when using a power

supply with a rated output greater than 60 V. To protect personnel against accidental contact with

hazardous voltages, ensure that the load and its connections have no accessible live parts. Ensure that

the load wiring insulation rating is greater than to the maximum output voltage of the power supply.

Getting Started 18

The rear output terminals can accept wire sizes AWG 24 to AWG 12 (See Table 2.1).However, we recommend using 12
AWG if current output is between 5 to 10 A. Refer to Table 2 below to determine the proper wire size.

Wire Gauge Rating
AWG
Imax (A)
mΩ/meter

Output Isolation

The output terminals of the 9240 Series are isolated from earth ground. An earth ground terminal is provided on the
front panel for convenience. Any output terminal may be grounded. However, output terminals must not exceed ±200
VDC.

10 12 14 16 18 20 22 24 26 28

40 25 20 13 10 7 5 3.5 2.5 1.7

3.3 5.2 8.3 13.2 21 33.5 52.8 84.3 133.9 212.9

Table 2.1 Wire Gauge Rating

SHOCK HAZARD

Floating voltage must not exceed 200 VDC.

2.4 Preliminary Check

Complete the following steps to verify the Power supply is ready for use.

Getting Started 19

Verify AC

Input Voltage

Connect Power

& Self-Test

After Power on, during the self-test, the following should be displayed:

Verify and check to make sure proper AC voltages are available to power the instrument.
The AC voltage range must meet the acceptable specication as explained in section “2.1

Input Power and Fuse Requirements”.

Connect AC power cord to the AC receptacle in the rear panel and press the power button.
It will run through a self-test procedure initially before booting to the main screen.

Figure 2.2 Initializing

After the system scan is complete the LCD will display as shown in Figure ??

Figure 2.3 Home Display

Note:

The initial power on state is based on the settings set on Power-ON

2.5 Self test Errors

The following errors will be displayed if the self-test did not complete successfully:

Error Message Description

EEPROM Fail The internal EEPROM is corrupted or damaged.

System Lost Last system settings within the EEPROM are lost.

Module Fail Channel response failure.

Cal Lost Calibration data within the EEPROM is lost.

Getting Started 20

Fact Loss Factory calibration data is lost.

Model Lost Channel initialization failed.

Table 2.2 Error Message

If any of these errors occur, please contact B&K Precision.

Basic Front Panel Operation

At power-on, the power supply will automatically enter the front-panel operation mode and the instrument can be
controlled via the front panel keys and knob.

3.1 Keys

3.1.1 Function Keys

There are three main keys:

Navigates the 2 available screens.

When navigating any menu the key

will return to the main display.

2 available displays:

– Main page:

Overview of the output.

– Live Output Monitoring:

Oscilloscope like overview of the

measured output parameters.

Opens up a menu giving access to

various save and load

options, regardless of the

current display of the screen.

Opens the main menu bar. Pressing

Utility will navigate to the main menu

bar if any menu bar is already open.

3.1.2 Soft Keys

The unit has six soft keys, which are located beneath the screen. Each key selects the corresponding function. Functions
will vary depending on the current menu or display.

Figure 3.1 Soft Keys

3.1.3 Numeric Keys

The numeric keys allow the conguration of various parameters. Using the numeric keys provides a fast and precise

input. The key can be found with the numeric keys. Pressing enter will assign the selected value to the desired
parameter.

Basic Front Panel Operation 22

Figure 3.2 Numeric Keys

3.1.4 Output Control

The button toggles the output On/O. When output is enabled, the ON button will turn green and the
supply will display the state of the channel.

represents constant current mode. represents constant voltage mode. When output is disabled, the

channel state will display .

Basic Front Panel Operation 23

3.2 Display

The power supplies have two main display modes: output overview and live output monitoring display. Press the
button to cycle between the dierent display modes or to return home when viewing any other menu.

Output Overview

Provides information of the outputs’:

• State

• Run time

• Voltage

• Current

• Power

• Vmax/Vmin

• OVP/OCP

• OnDelay/ODelay

Allows conguration of:

• Vset

• Iset

• Vmax/Vmin

• OVP/OCP

• OnDelay/ODelay

Figure 3.3 Output Overview Display

Basic Front Panel Operation 24

Live Output Monitoring

The live output monitoring display shows metered output voltage and current over time.
It is always active and will continuously plot and overwrite the oldest value when the display graph is full.

Figure 3.4 Live Output Monitoring Display

The Live output display can be congured by setting the: Voltage, Current, and Time Scale.

Voltage Scale

The voltage scale of each output can be set from 10 mV/Div up to 20 V/Div.

1. While in Live Output Display use the softkeys to select Voltage Scale.

2. Select a channel to congure.

3. Use the rotary knob to navigate through the available scales.

Current Scale

The current scale of each output can be set from 10 mA/Div up to 3 A/Div.

1. While in Live Output Display use the softkeys to select Current Scale.

2. Select a channel to congure.

3. Use the rotary knob to navigate through the available scales.

Time Scale

The time scale of each output can be set from 1 s/Div up to 10 min/Div.

1. While in Live Output Display use the softkeys to select Time Scale.

2. Use the rotary knob to navigate through the available scales.

Basic Front Panel Operation 25

Voltage Oset

A voltage oset can be added.

The oset can be set from 0 V up to 32.2 V on the 9240 and 0 V up to 60.6 V on the 9241/9242.

1. While in Live Output Display use the softkeys to select Voltage Oset.

2. Select a channel to congure.

3. Use the rotary knob to navigate through the available scales.

Current Oset

A current oset can be added to each output.

The oset can be set from 0 A up to 8.08 A on the 92400 A, from 0 to 4.04 A on the 9241, and 0 to 10.1 A on the

9242.

1. While in Live Output Display use the softkeys to select Current Oset.

2. Select a channel to congure.

3. Use the rotary knob to navigate through the available scales.

3.3 Check Model and Firmware Version

The rmware version, model, and serial number can be veried by entering the security settings. Press button
then use the soft keys to select Utilities > Help > System Info to view model and rmware information.

3.4 Setting Voltage and Current

Follow the steps below to set the output voltage or current. The values can be entered using the numeric keypad or the
rotary knob.

1. Using the keypad: Use the soft keys to select the channel VSET or ISET settings beneath channel view on

the display. Then use the numeric keypad to input the voltage or current value then press to conrm.

2. Using the rotary knob: Use the soft keys to select the channel VSET or ISET settings beneath the channel
view on display. Then turn the knob clockwise to increment or counter-clockwise to decrement the value. Use the

below the rotary knob to move the cursor. Press the knob in to conrm.