B+K precision 9140 Series User manual

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 trans-
former 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.
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.

3
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.
• 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.

4
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.
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

5
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.

6
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
This is the In position of the power switch when instrument is ON.
This is the Out position of the power switch when instrument is OFF.
is used to address practices not related to physical injury.

Contents
1 Introduction 9
1.1 Product Overview 9
1.2 Contents 9
1.3 Features 10
1.4 Dimensions 10
1.5 Rackmount Installation 10
1.6 Front Panel 10
1.7 Display 11
1.8 Rear Panel 11
2 Getting Started 12
2.1 Input Power and Fuse Requirements 12
2.2 Fuse Requirements 12
2.3 Check or Replace Fuse 13
2.4 Output Connections 13
2.5 Preliminary Check 14
2.6 Self test Errors 15
3 Basic Front Panel Operation 16
3.1 Keys 16
3.1.1 Main Keys 16
3.1.2 Soft Keys 16
3.1.3 Numeric Keys 17
3.1.4 Output Control 17
3.2 Display 18
3.3 Check Model and Firmware Version 21
3.4 Setting Voltage and Current 21
4 Output Conguration 22
4.1 Protection Settings 22
4.1.1 Over Voltage Protection (OVP) 22
4.1.2 Over Current Protection (OCP) 22
4.1.3 Over Temperature Protection & Over Temperature Warning (OTP & OTW) 22
4.1.4 Vmax/Vmin 23
4.1.5 Protection Clear 23
4.2 Output Settings 23
4.2.1 Remote Sense 23
4.2.2 Output Timer 24
4.2.3 Voltage Slew 24
4.2.4 Current Slew 24
4.2.5 On/O Delay 25
4.3 Operating Mode and Coupling 25
4.3.1 Normal Mode 25
4.3.2 Series Mode 27
5 List Mode 38
5.1 List Setup 38
5.2 Edit List 40
5.2.1 Load/Save List 40
5.2.1 List Number 41
5.2.2 Next 41
5.2.3 Repeat 42
5.2.4 Steps 42
5.3 List Run 44

8
6 Data Logger 46
6.1 Using the Data Logger Function 46
6.2 Parameters 47
6.2.1 Sampling Interval 47
6.2.2 File Path 47
6.2.3 T. Stamp Filename 47
6.2.4 Log Data 48
6.2.5 Status Code 49
6.2.6 Trigger Source 49
6.2.7 Datalog Start/Stop 49
7 Utilities Menu 50
7.1 User Settings 50
7.1.1 Key Lock Output 50
7.1.2 Beep Sound 50
7.1.3 Date 50
7.1.4 Time 51
7.1.5 Screen Intensity 51
7.1.6 Language 51
7.2 Remote Interface 51
7.2.1 USB Settings 52
7.2.2 LAN 53
7.3 GPIB (optional) 58
7.4 Digital I/O 59
7.4.1 Functions 59
7.4.1 Polarity 60
7.4.1 Inhibit Mode 61
7.5 Test/Admin 62
7.5.1 Self Test 62
7.5.2 Security 62
7.6 Error Log 64
7.7 Help 65
7.8 On Screen Help 65
8 Key Lock 66
9 Save/Recall 67
9.1 Save the Output Settings 67
9.2 Recall the Instrument’s Settings 68
9.3 Power-On Settings 69
9.4 Screenshot 70
10 Calibration Adjustment Procedure 71
10.1 Voltage Calibration Adjustment 72
10.2 Current Calibration Adjustment 73
10.3 OVP Calibration Adjustment 74
10.4 OCP Calibration Adjustment 75
10.5 RTC Calibration Adjustment 76
11 Performance Verication 77
12 Service Information 80
13 LIMITED THREE-YEAR WARRANTY 81

Introduction
1.1 Product Overview
9140: 32 V / 8 A / 300 W 9141: 60 V / 4 A / 300 W
Figure 1.1 Front View
The 9140 Series triple output multi-range DC power supplies combine industry-leading power density and performance
with an extensive set of features in a compact 2U form factor.
Three isolated output channels each produce 100 W of clean power with exceptionally low ripple and noise characteristics.
Combine channels to output up to 300 W, distributing the power across all three channels. Multiple outputs paired with
advanced list mode programming, data logging, and protection features make these power supplies suitable for a wide
range of benchtop or test system applications.
Model 9140 9141
Voltage per Channel 0 to 32 V 0 to 60 V
Current per Channel 0 to 8 A 0 to 4 A
Maximum Output Power per Channel 100 W
Maximum Combined Output Power 300 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 9140 or 9141 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 10
1.3 Features
• Three independent galvanically isolated, oating output channels providing up to 100 W per channel or 300 W total
when combining all three channels
• High power density, compact 2U half-rack form factor
• Multi-ranging operation delivers rated power at more voltage/current combinations
• Combine outputs in parallel or series to increase current or voltage (up to 24 A or 180 V depending on the model)
• 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
• Overvoltage (OVP), overcurrent (OCP), overtemperature (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
• LabVIEW𝑇 𝑀, IVI-C, and IVI.NET drivers provided
1.4 Dimensions
The 9140 power supply’s 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
1.5 Rackmount Installation
The 9140 Series is compatible with the optional 19-inch rackmount kit model RK2US. The RK2US installation intructions
can be downloaded from bkprecision.com
1.6 Front Panel
The front panel interface allows for control of the unit.

Introduction 11
Item Description
1 Main Display
2 Keypad
3Triple Channel Output
Terminals
4 Rotary Knob
5 Main function keys
6 USB host port
7 Power button
8 Soft Menu Keys
1.7 Display
Item Description
Indicates output is o
Indicates constant voltage mode
Indicates constant current mode
Tracking mode enabled
Indicates remote mode
Keyboard lock enabled
Indicates data logging is enabled
LAN status indicator
1.8 Rear Panel
Item Description
1 Kensington security slot
2 GPIB interface (Optional)
3Rear output and
remote sense terminals
4 Digital I/O terminal block
5 USB interface
6 LAN interface
7 Chassis ground
8AC power input
& fuse box

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:
Voltage: 100 - 240 VAC (+/- 10 %)
Frequency: 50/60 Hz
Input Power: 500 VA MAX.
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.
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.
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
9140 8 A, 250 V
9141 8 A, 250 V

Getting Started 13
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.
Check and/or Change Fuse
• Locate the fuse box next to the AC input connector in the rear panel. See 1.8
• With a small at 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 (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.
2.4 Output Connections
The main DC output terminals are in the front and rear panel of the power supply. The front panel has individual isolated
binding post terminals that can also accept sheathed banana jack connectors. The rear panel has terminal block pins for
each channel’s main output.
Before connecting wires to the 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.

Getting Started 14
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.
The 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. Refer to Table 2 below to determine the proper wire size.
Figure 2.2 Wire Gauge Rating
Output Isolation
The output terminals of the 9140 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.
SHOCK HAZARD
Floating voltage must not exceed 200 VDC.
2.5 Preliminary Check
Complete the following steps to verify the Power supply is ready for use.
1. Verify AC
Input Voltage 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 “2.1 Input Power
and Fuse Requirements”.
2. Connect Power
& Self-Test 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.

Getting Started 15
After Power on, during the self-test, the following should be displayed:
Figure 2.3 Scan System
After the system scan is complete the LCD will display as shown in Figure
Figure 2.4 Scan complete
Note:
The initial power on state is based on the settings in Power-ON
2.6 Self test Errors
The following errors will be displayed if the self-test did not complete successfully:
Error Message on Display 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.
Fact Loss Factory calibration data is lost.
Model Lost Channel initialization failed.
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 con-
trolled via the front panel keys and knob.
3.1 Keys
3.1.1 Main Keys
There are three main keys:
Navigates the 5 available screens.
When navigating any menu returns the
key will return "Home" main display.
5 available displays:
–Main page:
Overview of the 3 outputs.
–Single Channel Display 1 to 3:
Detailed channel overview.
–Live Output Monitoring:
Oscilloscope like overview of the
measured output parameters.
Opens up a menu giving access to
various save and load options, regard-
less of the current display of the screen.
Opens the main menu bar. If a menu
bar is already open, pressing will
navigate to the main menu bar.
More information on each display in 3.2.
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

Basic Front Panel Operation 17
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.
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. This is indicated for each channel
independently. When output is disabled, the channel state will display .
The key toggles all the channels On/O simultaneously. Its function may vary depending on the coupling state
of the channels. For more information go to Coupling.

Basic Front Panel Operation 18
3.2 Display
These power supplies have three main display modes: three channel display, single channel display, 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.
Three Channel Display
Provides information of the outputs’:
• State
• Run time
• Voltage
• Current
• Power
Allows conguration of:
• Vset
• Iset
Figure 3.3 Three Channel Display

Basic Front Panel Operation 19
Single Channel Display
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 3.4 Single Channel Display

Basic Front Panel Operation 20
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 3.5 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.