INSTRUCTION
MANUAL
Model 8540
Model 8540
60V/30A/150W DC Electronic Load
WARNING
Safety Regulations
To avoid electrical shock, do not open the cabinet. Refer servicing to
qualified personnel only.
To avoid injuries, always disconnect power, discharge circuits, and
remove external voltage sources before touching components.
KEEP AWAY FROM LIVE CIRCUITS.
We cannot accept responsibility for any direct or indirect financial
damage or loss of profit that might occur when using the electronic load.
The instrument chassis and cover must be connected to an electrical
ground.
Certification
We certify that this product met its published specifications at time of
shipment from the factory.
Notice
The information contained in this document is subject to change without
notice. Please consult the B&K Precision website www.bkprecision.com
for the latest version.
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
Connect it to safety earth ground using the wire recommended in
the user’s manual.
High voltage danger
The symbol on an instrument indicates that the user should refer
to the operating instructions located in the manual.
Check out
Unpacking the instrument
This instrument was carefully inspected before shipment. Upon receipt,
inspect the instrument for damage that might have occurred in transit. If
any sign of damage is found, notify your B&K Precision distributor.
Check the list of supplied items
Verify that you have received the following items with your power
supply. If anything is missing, contact your authorized B&K Precision
distributor.
- Power cord
- Instruction manual
Power Requirements
The 8540 can operate on 110V AC or 220V AC. Before connecting the
power cord to an AC outlet, make sure the voltage selector in the rear is
set to the correct line voltage. If necessary, replace fuses according to
the table below.
FuseRangeLine voltage
T0 500 mA, 250V99 V to 121 V110V AC
T0 250 mA, 250V198 V to 242 V220V AC
The instrument power fuse is located in a fuse compartment below the
AC input receptacle. To access the fuse, fi rs t disconnect the power
cord and then remove the fuse cartridge.
Power-on procedure
Turn on the instrument by pressing the main power switch on the front
panel of the unit. The instrument will automatically revert to the last
setting before the power was turned off.
Note
The 9 pin D-sub connector in the rear is for factory use only!
This instrument does not offer a remote control interface.
About the 8540
The B&K Precision 8540 DC electronic load (60V/30A/150W)
can sink DC current in constant current, constant voltage, and
constant resistance modes. Measured values have 10 mV and 1
mA resolution. Shorts can be simulated. Storage is provided for up
to 100 groups, with 4 instrument setups per group. The instrument
is easy to use and will find many uses for testing DC power supplies,
batteries, and DC to DC converters.
Constant Current (CC) mode
In CC mode, the DC load
V
V
draws a constant current
regardless of the voltage on
CC時,
its terminals.
為幾伏特
,ITECH
來吸取電流
I
ConstantCurrent
Constant current
Constant Voltage (CV) mode
V
Constant voltage
Constant Resistance (CR) mode
V
I
In CV mode, the DC
load will draw enough
current to keep the
voltage at the
terminals constant.
II
I
In CR mode, the DC
load will sink a current
linearly proportional to
the voltage at the
terminals.
Features
Full digital control
1mV /1mA measurement resolution
Compact size
Bright, readable LED display
Operating modes: CC/CV/CR
Input on/off control
High reliability due to OCP/OVP (over
current, over voltage) protection
Storage for 100 groups, 4 setups
each
Easy operation
I
Constant
Constant resistance
Panel layout
Voltage or preset current,
voltage or resistance value
Step B + memory B
Step A + memory A
Step C + memory C
Step D + memory D
Current or power value
Power display indica tor
Memory save (shift)
Left arrow + memory A
Setup indicator
Voltage display indicator
CC mode indicator
Recall indicator
CV mode indicator
Short indicator
CR mode indicator
30A mode selector indicator
Shift indicator
Input off indicator
Current display indicator
Recall (shift)
Right arrow + memory B
Function setup (shift)
Switch + memory C
Short on/off
Input on/off button
Air flow input
Main power on/off
3/30A selector（shift)
Mode selector + memory D
Rotary encoder
Shift button
Input +
Input -
Quick Start
Set the line voltage selector on the back panel to your local line voltage
(110 VAC or 220 VAC). Then connect the power cord to the DC load and
a wall power socket.
Turn on the power to the DC load by pressing the 1 on the power switch.
Set value
Constant Current Mode
D
Press the key to turn on the
D
Mode
Mode
150W DC Electronic Load
8540
Set
Recall CC
CC LED. The load is now in CC
mode. Set the current value by
pressing the or keys to
AA
BB
select the digit to adjust, then turn
the knob to change its value. After
setting the current value, press the
On/OffOn/Off
key to turn the load on.
Constant Voltage Mode
D
D
Mode
Press the key to turn on the
CV LED. The load is now in CV
mode. Set the voltage value by
pressing the or keys to
select the digit to adjust, then turn the
knob to change its value. After
setting the voltage value, press the
On/OffOn/Off
key to turn the load on.
Mode
AA
BB
A
B
C
D
Indicates which digit to adjust
Set value
150W DC Electronic Load
A
B
C
8540
D
V
W
A
Set
V
W
A
Short CV
CR
30A
OFF
Shift
Recall CC
Short CV
30A
OFF
CR
Shift
Constant Resistance Mode
D
D
Mode
Press the key to turn on the
CR LED. The load is now in CR mode.
Set the resistance value by pressing
AA
the or keys to select the
digit to adjust, then turn the knob.
After setting the voltage value, press
On/OffOn/Off
the key to turn the load on.
Mode
BB
Indicates which digit to adjust
8540
150W DC Electronic Load
A
B
C
D
Set
V
W
A
Recall
Short CV
30A
OFF
CC
CR
Shift
Input on/off
The load can be toggled on and off
by pressing the key. The
programmed setting is not affected.
The OFF LED will be lit when the
load is off.
On/OffOn/Off
Change the displayed values
The electronic load usually displays
the actual voltage and current values.
C
Press the key to display the
View
preset voltage, current or resistance
value and the actual power. Press
C
the key again to return to the
View
current/voltage display.
OCP function
Press the key, then press the
C
View
OCP (Over Current Protection).
This is the maximum current that
will be allowed. Use the and
BB
value.
The input of the electronic load will
be turned off automatically if the
OCP value is lower than the actual
current value. The default OCP
setting is 30 A.
ShiftShift
key. The display will show
AA
keys and the knob to set the
NOTE
150W DC Electronic Load
A
B
150W DC Electronic Load
A
C
B
C
8540
D
8540
D
Set
V
W
A
Set
V
W
A
Recall
Short CV
30A
OFF
CC
CR
Shift
Recall
Short CV
30A
OFF
Shift
CC
CR
Key sound
C
Press again to turn the key
sound ON or OFF (bEEP). Use the
rotary knob to make your selection.
View
150W DC Electronic Load
A
B
C
8540
D
Set
V
W
A
Recall CC
Short CV
CR
30A
OFF
Shift
Set address
C
Press twice to skip the
address menu and advance to the
next menu.
View
150W DC Electronic Load
8540
Set
V
Recall CC
Short
CV
Note: This setting is for factory use
A
B
C
D
W
only and should be ignored.
A
Choose Storage Group
C
Press the key to see the
storage group (GrP) setting. Use
AA
the and
keys and knob to choose the
View
BB
150W DC Electronic Load
Set
V
8540
storage group. Each group can
store four instrument settings. (see
C
storage operation). Press the
View
key to confirm selection of the
displayed storage group. There are
A
B
C
D
W
A
100 groups that can be stored.
Store Operation
To save the load’s settings to a register (internal memory), press the and
(Save) keys. The LEDs will blink together.
Press the or or or keys to save the settings to non volatile
AA
BB
A
B
C
C
View
D
D
D
Mode
Mode
memory. Note you may do this for any of the 100 different groups assigned in the
previous paragraph (Choose Storage Group).
ShiftShift
CR
30A
OFF
Shift
Recall CC
Short
30A
OFF
CV
CR
Shift
AA
Recall Operation
Press the and (Recall) keys. The Recall LED will turn on, which means
ShiftShift
you may recall settings from the currently-chosen group. Press the or or
D
C
View
D
Mode
or keys to recall the desired setting. When the Recall LED is lit,
Mode
the other keys are disabled. To exit the recall state, press the and
(Recall) keys again.
BB
AA
ShiftShift
BB
Short
When the + keys are pressed, the load simulates a short circuit. In CC
ShiftShift
and CR modes, the maximum short-circuit current value is 1.2 times the current
range. In CV mode, the short-circuit current is the same as setting the CV
operation to 0.1 V. Note that the short-circuit current in CV mode will be less than
the short-circuit current in CC or CR modes.
On/OffOn/Off
BB
Current range switch (3/30 A)
ShiftShift
The and keys switch between the 3 A and 30 A ranges. The 30A
D
D
Mode
Mode
LED is lit when the load is on the 30 A range. The current resolution is 10 mA
for the 30 A range and 1 mA for the 3 A range.
Checking the set value
The electronic load usually displays the actual voltage and current values at the
load’s terminals. To check the set value, press the or keys. The set
AA
BB
value display will blink, showing you the currently-set value. You can use the
knob to change it. It will stop blinking after 3 seconds and revert to the previous
display. You can also turn the knob to see the set value.
Knob incremental values
The following table shows the incremental changes in the set value when
the knob is turned corresponding to which “cursor” LED is lit.
Cursor
position
A
Voltage
Increment
10 V
Current
Increment
Resistance Increment
IncrementRangeIncrementRange
1 A0-3 A
1 Ω0.1-10 Ω
10 Ω10-99 Ω
B
C
D
100 Ω100-999 Ω
10 A0-30 A
1000 Ω1000-4000 Ω
0.1 Ω0.1-10 Ω
0.1 A0-3 A
1 Ω10-99 Ω
1 V
10 Ω100-999 Ω
1 A0-30 A
100 Ω1000-4000 Ω
0.01 Ω0.1-10 Ω
0.01 A0-3 A
0.1 Ω10-99 Ω
0.1 V
1 Ω100-999 Ω
0.1 A0-30 A
10 Ω1000-4000 Ω
0.001 Ω0.1-10 Ω
0.001 A0-3 A
0.01 Ω10-99 Ω
0.01 V
0.1 Ω100-999 Ω
0.01 A0-30 A
1 Ω1000-4000 Ω
Specifications
8540Parameter
0 – 60 VVoltage
Input rating ( 0 - 40 ℃)
Load Regulation
CV Mode
Regulation
CC Mode
Regulation
CR Mode
Regulation
Current
Measurement
1 mA – 30 ACurrent
150 WPower
ResolutionAccuracyRange
1 mV±(0.05%+0.1%FS)0-10 V
10 mV±(0.05%+0.1%FS)0-60 V
1 mA±(0.1%+0.1%FS)0-3 A
10 mA±(0.1%+0.15%FS)0-30 A
10 mV±(0.05%+0.1%FS)0.1-60 V
1 mA±(0.1%+0.1%FS)0-3 A
10 mA±(0.1%+0.15%FS)0-30 A
0.001 Ω±(1%+0.8%FS)0.1-10 Ω
0.01 Ω±(1%+0.8%FS)10-99 Ω
0.1 Ω±(1%+0.8%FS)100-999 Ω
1 Ω±(1%+0.8%FS)1K-4K Ω
1 mA±(0.1% + 0.1%FS)0-3 A
10 mA±(0.1% + 0.15%FS)0-30 A
Voltage
Measurement
Power
Measurement
Dimension（W x H x D）
Weight (net)
Specifications and information are subject to change without notice. Please visit www.bkprecision.com
for the most current product information.
10-99 W
88 x 175 x 282 mm
3.5 x 6.9 x 11.10 inches
2.7 kg
6 pounds
1 mV±(0.05% + 0.1%FS)0-10 V
10 mV±(0. 0 5% + 0. 1%F S)0-60 V
1 mW±(1%+0.5%FS)0-10 W
10 mW±(1%+0.5%FS)
100 mW±(1%+0.5%FS)100-150 W
Warranty
Service Information
Warranty Service: Please go the service an d support section on our website www.bkprecision.com
to obtain a RMA #. Return the product in the original packaging with proof of purchase to the address
below. Clearly state on the RMA the performance problem and return any leads, probes, connectors
and accessories that you are using with the device.
Non-Warranty Service: Please go the service and support section on our website
www.bkprecision.com
below. Clearly state on the RMA the performance problem and return any leads, probes, connectors
and accessories that you are using with the device. Customers not on an open account must include
payment in the form of a money order or credit card. For the most current repair charges please refer
to the service and support section on our website.
Return all merchandise to B&K Precision Corp. with pre-paid shipping. The flat-rate repair charge for
Non-Warranty Service does not include return shipping. Return shipping to locations in North America
is included for Warranty Service. For overnight shipments and non-North American shipping fees
please contact B&K Precision Corp.
to obtain a RMA #. Return the product in the original packaging to the address
B&K Precision Corp.
22820 Savi Ranch Parkway
Yorba Linda, CA 92887
www.bkprecision.com
714-921-9095
Include with the returned instrument your complete return shipping address, co ntact name,
phone number and description of problem
Limited One-Year Warranty
B&K Precision Corp. warrants to the original purchaser that its products, and the component parts
thereof, will be free from defects in workmanship and materials for a period of one year from date of
purchase.
B&K Precision Corp. will, without charge, repair or replace, at its option, the defective product or its
component parts. The returned product must be accompanied by proof of the purchase date in the
form of a sales receipt.
To obtain warranty coverage in the U.S.A., this product must be registered by completing a warranty
registration form on www.bkprecision.com
Exclusions: This warranty does not apply in the event of misuse or abuse of the product or as
a result of unauthorized alterations or repairs. The warranty is void if the serial number is
altered, defaced or removed.
B&K Precision Corp. shall not be liable for any consequential damages, including without limitation
damages resulting from loss of use. Some states do not allow limitations of incidental or
consequential damages. So the above limitation or exclusion may not apply to you.
This warranty gives you specific rights and you may have other rights, which vary from state-to-state.
within fifteen (15) days of purchase.
B&K Precision Corp.
22820 Savi Ranch Parkway
Yorba Linda, CA 92887
www.bkprecision.com
714-921-9095
Intentionally left blank
22820 Savi Ranch Parkway
Yorba Linda, CA 92887
www.bkprecision.com
© 2008 B&K Precision Corp.
Printed in China version 12092008
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