B+K precision 8540 User manual

Model 8540

60V/30A/150W DC Electronic Load

INSTRUCTION

MANUAL

Model 8540

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.

WARNING

We certify that this product met its published specifications at time of

shipment from the factory.

Certification

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

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)

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.

Safety Symbols

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.

- 8540 DC Electronic load

- Power cord

- Instruction manual

Power Requirements

The 8540 can operate on 110VAC or 220VAC line input. Before

connecting the power cord to anAC outlet, make sure the voltage

selector in the rear is set to the correct line voltage. Additionally, please

check that you have the correct fuse inserted in the fuse box below the

AC input receptacle. The fuse to use is referenced in the below table:

To access the fuse, first 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.

Initial Check

Line voltage Range Fuse

110V AC 99 V to 121 V T0 500 mA, 250V

220V AC 198 V to 242 V T0 250 mA, 250V

The 9 pin D-sub connector in the rear is for factory use only! This

instrument does not offer remote control interface or programmability.

Note

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

mAresolution. Shorts can be simulated. Storage is provided for up

to *40 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.

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 *40 groups, 4 setups

each

Easy operation

Features

Constant Resistance (CR) mode

In CR mode, the DC

load will sink a current

linearly proportional to

the voltage at the

terminals.

Constant

Constant resistance

Constant Current (CC) mode

ConstantCurrent

CC時,

為幾伏特,ITECH

來吸取電流

Constant current

In CC mode, the DC load

draws a constant current

regardless of the voltage on

its terminals.

Constant voltage

Constant Voltage (CV) mode

In CV mode, the DC

load will draw enough

current to keep the

voltage at the

terminals constant.

*40 groups are applicable for units with firmware

version 1.60 or above. For versions below 1.60, 100

groups are available. Go to “Verify firmware” section

to determine your instrument version.

3/30A selector（shift)

Shift button

Main power on/off

Air flow input

Input on/off button

Switch + memory C

Left arrow + memory A

Memory save (shift)

Current or power value

Step D + memory D

Step C + memory C

Step A + memory A

Step B + memory B

Voltage or preset current,

voltage or resistance value

CV mode indicator

Short indicator

CC mode indicator

CR mode indicator

Recall indicator

30A mode selector indicator

Shift indicator

Input off indicator

Right arrow + memory B

Rotary encoder

Input +

Input -

Recall (shift)

Function setup (shift)

Mode selector + memory D

Voltage display indicator

Current display indicator

Setup indicator

Short on/off

Panel layout

Power display indicator

Quick Start

Set the line voltage selector on the back panel to your local line voltage (110 VAC

or 220 VAC). Change the fuse to the correct fuse according to the table under

“Initial Check” section. Confirm that both changes are correct BEFORE

connecting the power cord to the DC load and a wall power socket.

Turn on the power to the DC load by flipping the power switch to “I” position.

Set value

Press the key to turn on the

CC LED. The load is now in CC

mode. Set the current value by

pressing the or keys to

select the digit to adjust, then turn

the knob to change its value.After

setting the current value, press the

key to turn the load on.

Constant Current Mode

Mode

On/OffOn/Off

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

key to turn the load on.

Constant Voltage Mode

Mode

On/OffOn/Off

Press the key to turn on the

CR LED. The load is now in CR mode.

Set the resistance value by pressing

the or keys to select the

digit to adjust, then turn the knob.

After setting the voltage value, press

the key to turn the load on.

Constant Resistance Mode

Mode

On/OffOn/Off

Set value

Indicates which digit to adjust

Recall CC

Short CV

OFF Shift

30A CR

A B C D

Set

150W DC Electronic Load 8540

Indicates which digit to adjust

Recall CC

Short CV

OFF Shift

30A CR

A B C D

Set

150W DC Electronic Load 8540

Recall CC

Short CV

OFF Shift

30A CR

A B C D

Set

150W DC Electronic Load 8540

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.

NOTE

OCP function (OCP)

Press the key, then press the

key. The display will show

OCP (Over Current Protection).

This is the maximum current that

will be allowed. Use the and

keys and the knob to set the

value.

ShiftShift

View

Change the displayed values

The electronic load usually displays

the actual voltage and current values.

Press the key to display the

preset voltage, current or resistance

value and the actual power. Press

the key again to return to the

current/voltage display.

View

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

Recall CC

Short CV

OFF Shift

30A CR

A B C D

Set

150W DC Electronic Load 8540

Short CV

OFF Shift

30A CR

A B C D

Set

150W DC Electronic Load 8540

Recall

Recall CC

Short CV

OFF Shift

30A CR

A B C D

Set

150W DC Electronic Load 8540

REL function (rEL)

After setting OCP, press to enter

the REL setting. Use the knob to select

ON or OFF. The default is OFF, which

means the display will show your set

value on the top display while you make

adjustments. It will then blink for 2

seconds before toggling the display to

show measured voltage. If users want to

adjust the set value using knob while see

the measured voltage and current

simultaneously without interruption,

select ON.

View

Recall CC

Short CV

OFF Shift

30A CR

A B C D

Set

150W DC Electronic Load 8540

Key sound (bEEP)

Press again to turn the key

sound ON or OFF (bEEP). Use the

rotary knob to make your selection.

View

Choose Storage Group (Grp)

Press the key to see the

storage group (GrP) setting. Use

the and

keys and knob to choose the

storage group. Each group can

store four instrument settings (Each

setting can store two parameters).

(see storage operation). Press

the key to confirm selection

of the displayed storage group.

There are 40 groups that can be

stored.

View

Recall CC

Short CV

OFF Shift

30A CR

A B C D

Set

150W DC Electronic Load 8540

Set address (Add)

Press twice to skip the

address menu and advance to the

next menu.

This setting is for factory use only and

should be ignored.

Recall CC

Short CV

OFF Shift

30A CR

A B C D

Set

150W DC Electronic Load 8540

View

NOTE

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

memory. PressingA will store to A location. B to B location. C to C location. D to D

location. Hence, users can save up to four settings in each group. Note you may do

this for any of the 40 different groups assigned in the previous paragraph (Choose

Storage Group). Each settings can store two parameters: The mode of operation (i.e.

CC, CV, CR) and the values set for that mode.

ShiftShift

View

Mode

A B C D

Short

When the + keys are pressed, the load simulates a short circuit. In CC

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.

ShiftShift

On/OffOn/Off

Recall Operation

Press the and (Recall) keys. The Recall LED will turn on, which means

you may recall settings from the currently-chosen group. Press the or or

or keys to recall the desired setting. When the Recall LED is lit,

the other keys are disabled. To exit the recall state, press the and

(Recall) keys again.

ShiftShift

View

Mode

The and keys switch between the 3 A and 30 A ranges. The 30A

LED is lit when the load is on the 30 A range. The current resolution is 10 mA

for the 30A range and 1 mA for the 3 A range.

Current range switch (3/30 A)

ShiftShift

Mode

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

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.

Verify Firmware

To verify the firmware version of your DC Electronic load, do the following:

-First, power off the unit. Then hold down the button.

-Turn the power switch ON while holding down the button.

-The top display will show “VEr” and bottom display will show a number, which is

the firmware version of your load.

View

C View

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