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USER’S GUIDE
Programmable DC Electronic Load
Models IT 8500 series
IT8511/IT8512 /IT8512B/IT8512C
© Copyright 2004 All Rights Reserved
Ver1.1/APR, 2006/ IT8500-401
1
Quick Reference..............................................................................................................................6
T
HE
F
RONT
P
ANEL
..........................................................................................................................6
T
HE
R
EAR
P
ANEL
............................................................................................................................7
F
RONT
P
ANEL
A
NNUNCIATORS
........................................................................................................7
K
EY
P
AD
........................................................................................................................................8
I
MMEDIATE
A
CTION
K
EYS
.................................................................................................................8
M
ENU
O
PERATION
...........................................................................................................................9
General Information ......................................................................................................................11
D
OCUMENT
O
RIENTATION
..............................................................................................................11
G
ETTING
S
TARTED
M
AP
................................................................................................................11
O
PTIONS AND
A
CCESSORIES
.........................................................................................................11
Options
..................................................................................................................................11
Accessories.............................................................................................................................12
D
ESCRIPTION
................................................................................................................................12
F
EATURES AND
C
APABILITIES
........................................................................................................12
F
RONT
P
ANEL
C
ONTROLS
.............................................................................................................12
R
EMOTE
P
ROGRAMMING
...............................................................................................................12
O
PERATING
M
ODES
......................................................................................................................12
Constant Current
(
CC
)
Mode
.............................................................................................13
Constant Resistance (CR) Mode
..........................................................................................13
Constant Voltage (CV) Mode
................................................................................................13
Constant Power (CW) Mode
.................................................................................................14
T
RANSIENT
O
PERATION
.................................................................................................................14
Continuous..............................................................................................................................14
Pulse .......................................................................................................................................14
Trigger Mode...........................................................................................................................15
L
IST
O
PERATION
...........................................................................................................................15
T
RIGGERED
O
PERATION
................................................................................................................16
I
NPUT
C
ONTROL
............................................................................................................................16
Short On/Off............................................................................................................................16
Input On/Off ............................................................................................................................16
Operation Range.....................................................................................................................17
P
ROTECTION
F
EATURES
................................................................................................................17
R
EMOTE
S
ENSE
F
UNCTION
............................................................................................................18
S
AVING AND
R
ECALLING
S
ETTINGS
................................................................................................19
B
ATTERY
T
ESTING
........................................................................................................................19
V
ON
/V
OFF
O
PERATION
..................................................................................................................21
Installation .....................................................................................................................................21
I
NSPECTION
..................................................................................................................................21
Damage ..................................................................................................................................21
Items Supplied ........................................................................................................................21
Cleaning..................................................................................................................................22
L
OCATION
.....................................................................................................................................22
Installation...............................................................................................................................22
2
B
ENCH
O
PERATION
.......................................................................................................................23
R
ACK
M
OUNTING
..........................................................................................................................23
I
NPUT
C
ONNECTIONS
....................................................................................................................24
Power Cord .............................................................................................................................24
Turn-On Checkout.........................................................................................................................25
I
NTRODUCTION
..............................................................................................................................25
C
HECKOUT
P
ROCEDURE
...............................................................................................................25
In Case of Trouble ..................................................................................................................26
Front Panel Operation...................................................................................................................27
E
XAMPLE
......................................................................................................................................27
I-set (set up a constant current from 0 to Max current ) ..........................................................27
P-set (set up a constant power from 0 to Max power).............................................................28
R-set (set up a constant resistance from 0.1Ω to 4000Ω) .......................................................28
V-set (set up a constant voltage from 0.1V to Max voltage)
..............................................28
Shift + Store ............................................................................................................................28
Shift + Recall...........................................................................................................................28
In On/Off input setting .............................................................................................................29
Transition Parameter Setting ..................................................................................................29
Continuous Transient Operation .............................................................................................29
Pulse Transient Operation ......................................................................................................30
Toggled Transient Operation ..................................................................................................30
List Operation..........................................................................................................................31
F
AST
R
ECALL
F
UNCTION
...............................................................................................................32
A
UTOMATIC
T
ESTING
F
UNCTION OF
E
LECTRONIC
L
OAD
...................................................................32
Edit the Testing File ................................................................................................................32
Fast Recall the Test File
.......................................................................................................33
Automatic Testing ...................................................................................................................34
Select the Resolution between Low Range and High Range
............................................34
Specifications................................................................................................................................35
Remote Operation Mode...............................................................................................................36
1 C
OMMUNICATION CABLE
.............................................................................................................36
2 C
OMMUNICATION BETWEEN ELECTRONIC LOAD AND
PC...............................................................37
3
Warranty Information
Certification
We certify that this product met its published specifications at time of shipment from the factory.
Warranty
This hardware product is warranted against defects in material and workmanship for a period of
ONE year from date of delivery. IT8500 series electronic load for use with a hardware product and when properly installed on that hardware product, are warranted not to fail to execute their programming instructions due to defects in material and workmanship for a period of 90 days from date of delivery. During the warranty period our company will either repair or replace products which prove to be defective. Our company does not warranty that the operation for the software firmware or hardware shall be uninterrupted or error free.
For warranty service, with the exception of warranty options, this product must be returned to a service facility designated by our company. Customer shall prepay shipping charges by (and shall pay all duty and taxes) for products returned to our place for warranty service. Our company shall pay for return of products to Customer.
Limitation of Warranty
The foregoing warranty shall not apply to defects resulting from improper or inadequate maintenance by the Customer, Customer-supplied software or interfacing, unauthorized modification or misuse, operation outside of the environmental specifications for the product, or improper site preparation and maintenance.
Assistance
The above statements apply only to the standard product warranty. Warranty options product maintenance agreements and customer assistance agreements are also available.
Safety Summary
The following general safety precautions must be observed during all phases of operation of this instrument. Failure to comply with these precautions or with specific warnings elsewhere in this manual violates safety standards of design, manufacture, and intended use of the instrument .We assumes no liability for the customer’s failure to comply with these requirements.
Environmental Conditions
This instrument is intended for indoor use. Pollution degree 2 environments. It is designed to operate at a maximum relative humidity of 95% and at altitudes of up to 2000 meters. Refer to the specifications tables for the ac mains voltage requirements and ambient operating temperature range.
Before Applying Power
Verify that all safety precautions are taken. Note the instrument's external markings described under
"Safety Symbols".
4
Ground the Instrument
This product is a Safety Class 1 instrument (provided with a protective earth terminal). To minimize shock hazard, the instrument chassis and cover must be connected to an electrical ground. The instrument must be connected to the ac power mains through a grounded power cable, with the ground wire firmly connected to an electrical ground (safety ground) at the power outlet. Note: Any interruption of the protective (grounding) conductor or disconnection of the protective earth terminal will cause a potential shock hazard that could result in personal injury.
DO NOT OPERATE IN AN EXPLOSIVE ATMOSPHERE
Do not operate the instrument in the presence of fumes or flammable gases.
KEEP AWAY FROM LIVE CIRCUITS
Operating personnel must not remove instrument covers except as instructed in this Guide for installing or removing electronic load modules. Component replacement and internal adjustments must be made only by qualified service personnel. Do not replace components with power cable connected. Under certain conditions dangerous voltages may exist even with the power cable removed. To avoid injuries always disconnect power, discharge circuits, and remove external voltage sources before touching components.
DO NOT SERVICE OR ADJUST ALONE
Do not try to do some internal service or adjustment unless another person capable of rendering first aid resuscitation is present.
Safety Symbols
Direct current
Alternating current
Both direct and alternating current
Protective earth (ground) terminal
Caution (refer to accompanying documents)
WARNING
The WARNING sign denotes a hazard. It calls attention to a procedure, practice, or the like, which, if not correctly performed or adhered to, could result in personal injury. Do not proceed beyond a
WARNING sign until the indicated conditions are fully understood and met.
5
CAUTION
The CAUTION sign denotes a hazard. It calls attention to an operating procedure, or the like, which, if not correctly performed or adhered to, could result in damage to or destruction of part or all of the product. Do not proceed beyond a CAUTION sign until the indicated conditions are fully understood and met.
Quick Reference
The Front Panel
1 2
1
2
3
4
6 5 4 3
16-character display shows voltage and current measurements.
Rotary knob
Input terminals
Keypad:
Enable/disable input.
Setup the current, resistance and voltage modes.
Set and reset protection functions.
Scroll through front panel.
5
Entry keys:(numeric keys)
6
Enter values.
Increasing or decreasing the setup values.
Menu commands.
Power switch ON/OFF
6
The Rear Panel
3 4
1 2
1
2
3
4
4 Pin Trigger and Remote sensing connectors.
9-Pin COM port interface connector.
Power switch (110V / 220V)
3 Pin IEC320 ac input connector. (Power code requires ground conductor).
Front Panel Annunciators
OFF input off
CC
CV
Constant voltage (CV) mode.
CW Constant power (CW) mode.
CR
Tran
Constant current (CC) mode.
Resistance (CR) mode.
The input channel is enabled for transient operation.
Trigger
Rmt
Shift
Indicates that the electronic load is waiting an initiate and trigger to occur.
Sense
Indicates that the electronic load is in
Remote sensing state
Error A errors have occurred
Link In the communication state
Indicates that the electronic load is in remote state (RS-232). In the remote state, only the active key is the Local key.
Indicates that the shift key has been pressed.
List List mode is initiated or running.
Lock keyboard is locked by password
Unreg The input is unregulated.
7
Key Pad
POWER
0
~
9
ESC
P-set
R-set
Shift
On/Off
1 2 3 ESC
A B
Tran
4
5 6 0
Store Recall S-Tran Menu
I-set
P-set
V-set
R-set ENTER
7 8 9
Local Battery Short Trigger
Shift
Input on/off
0 through 9 are used for entering numeric values.
Decimal point.
The escape key. It may used to exit any working state.
Choosing CC mode and setup the input current of regulation current mode.
Choosing CV mode and setup the input voltage of regulation voltage mode.
Choosing CW mode and setup the input watt of regulation power mode.
Choosing CR mode and setup the input resistor of regulation resistance mode.
△
▽
Scrolling keys let you move through the commands in the presently
Select function menu, bring up the next command in the list. Function menus are circular; you can return to the starting position by continuous pressing the key.
Go back to the previous command in the list .Function menus are circular; you can return to the starting position by continuous pressing the key.
Enter
Immediate Action Keys
Shift
Shift
Shift
Shift
Shift
Shift
Shift
Shift
Shift
Shift
Shift
+
A
Switch to A setting value
+
B
Switch to B setting value
+
Tran
Start /Stop transition operation
+
Store
Press to store an existing electronic load state in non-volatile Memory.
+
Recall
Press to recall an existing electronic load state in non-volatile Memory.
+
S-Tran
Set the transition operation parameter
+
Menu
Enter operation Menu.
+
Local
When the load is controlled by PC, press these keys to enable the front panel key
+
Battery
Battery discharge electronic operation
+
Short
Turn on or turn off short circuit Test.
+
Trigger
Causes a trigger to occur. Change the trigger source is IMMEDIATE
8
Menu Operation
Press Menu to indicate operation mode .View the menu in VFD and using and to scroll through the completely menu list as following. If press
Enter key, you could get the selected menu function. Press
Esc back to the previous menu selection page.
MENU
CONFIG
INITIAL CONFIG
Return to the factory default setup value.
POWER-ON RECALL Setting Power-on state of Load.
ON
When users turn on the electronic load; the electronic load setup value will keep the state of last time when users turn off the electronic load.
OFF<DEFAULT>
Disable this function.
INPUT RECALL
ON
Setup the electronic load input state as it is turned on
When users turn on the electronic load; the electronic load input will keep the state of last time when users turn off the electronic load.
OFF<DEFAULT>
When users turn on the electronic load, the electronic load input state will keep the off.
KEY SOUND SET
Keypad sound setting.
ON<DEFAULT>
Enable key sound.
OFF
Disable key sound.
KNOB LOCK SET
Setup rotary knob lock state.
ON
Lock Rotary knob.
OFF<DEFAULT>
Unlock Rotary knob.
SHORT CUT RECALL Fast recall the data stored before
ON
OFF>
RANG SELECT
ON
Change the measure precision of voltage and current
OFF>
REMOTE SENSE
Setup voltage measurement Mode.
ON
The electronic load will measure input voltage from the remote sense connector.
OFF<DEFAULT>
The electronic load will measure input voltage from the front panel connector.
ADC UPDATE RATE
HIGH
LOW<DEFAULT>
TRIGGER SOURCE Choosing the trigger signals source.
IMMEDIATE<DEF> Trigger signals from
Shift
+
EXTERNAL
Trigger key
Trigger signals from the TRIG connector in the rear panel.
BUS
Communication command trigger mode.
9
CONNECT MODE
MAXTIDLEXING
SEPARATE<DEF>
BAUDRATE SET
Setting baud rate.
9600<DEFAULT>
9600
19200
38400
COMM. PARITY SET Command parity setting.
NONE<DEFAULT>
EVEN
ODD
ADDRESS SET
Setting communication Flow mode
KEY LOCK SET
EXIT
SYSTTEM SET
Setting keypad password.
MAX CURRENT SET Setup the maximum current.
MAX POWER SET
Setup the maximum power.
MAX VOLTAGE SET Setup the maximum voltage.
VOLTAGE ONSET
VOLTAGE OFFSET
EXIT
LIST SET
MODE SET
FIXED MODE
Setting operation mode.
Fixed mode.
LIST MODE
CALL LIST FILE
Choosing List mode.
Recall list operation file.
EDIT LIST FILE
Edit list operation file.
LIST STORE MODE Users can choose 4 kind of memory space to save the list file.
8 X 120 STEPS
Total 8 files and each file have120 list steps.
4 X 250 STEPS
Total 4 files and each file have250 list steps.
2 X 500 STEPS
Total 2 files and each file have500 list steps.
1 X 1000 STEPS
EXIT
LOAD ON TIMER
Total 1 file and each file have1000 list steps.
TIMER STATE
ON
Setting LOAD ON timer state
When users choose ON, and then turn on the electronic load input, the LOAD ON TIMER will start working. When the LOAD ON
TIMER is reach the setup time, the electronic load input will turn off automatically.
OFF<DEFAULT>
TIMER SET
Setting time of LOAD ON timer.
EXIT
EXIT
10
General Information
Document Orientation
This manual describes the operation of the IT8500 electronic loads. Unless otherwise noted, all units will be referred to by the description "electronic load" throughout this User's manual. The following documents and software are shipped with your electronic load. This User's Guide (this document), contains installation, checkout, front panel information and detailed programming information.
The Getting Started Map will help you find the information you need to complete the specific task that you want to accomplish. Refer to the table of contents or index of each guide for a complete list of the information contained within.
Getting Started Map
Task
Checking out the unit
Verifying proper operation
Using the front panel
Calibrating the unit
Using the front panel
Front panel keys
Front panel examples
Using the programming interface
RS-232 interface
Remote operation mode
Protocol information
Controller Program and Software driver:
Power View PV8500 software
Calibration PC8500 software
Active driver PD8500 OCX software
Where to find information
User’s Guide
User’s Guide
User’s Guide
User’s Guide
CD-ROM
(If you’ve purchased the communication cable, you will get it for free)
Options and Accessories
Options
IT-E151 Rack mounts kit: for install one or two IT8500 series load on the 19 inch rack.
IT-E131 isolated communication cable: This cable converts the electronic load’s serial port (TTL
5V level) to PC RS232 interface.
IT-E132 isolated communication cable: This cable converts the electronic load’s serial port (TTL
5V level) to PC USB interface.
IT-E134 isolated communication cable: This cable converts the electronic load’s serial port (TTL
5V level) to PC GPIB interface.
11
Accessories
Power cord
User’s manual
Software CD-Rom (if you buy the communication cable, you’ll get it for free)
Calibration testing report
Description
The IT8500 series electronic load is used for design, manufacturing, and evaluation of DC power supplies, batteries, and power components and so on. The electronic load contains a processor, serial port connector, front-panel keypad and VFD, and other circuits common to the other entire load module.
IT8500 series electronic load could work in constant current (CC) mode, constant voltage (CV) mode, or constant resistance (CR) mode and constant power (CW) mode.
Features and Capabilities
• High accuracy and high resolution
• Capable to work with constant current (CC), constant voltage (CV), constant resistance (CR) mode and constant power (CW) operation.
• Serial port interface-DB9-RS232 port.
• Triggered input and measurement functions.
• Within the controlled keypad in the front panel
• Built-in pulse generator for continuous, pulsed, and toggled transient mode operation.
• Over voltage, over current, overpower, and over temperature protection.
• Electronic load calibrate by Software.
• Fan speed control by temperature.
• VFD display
• Short circuit test
• Battery testing function.
Front Panel Controls
The front panel has keyboard controls for setting the input voltage, current and resistance. The panel display provides digital readouts of a number of functions including the inputs. Annunciators display the operating status of the electronic load.
Remote Programming
The electronic load may be remotely programmed from the computer via the IT-E131 isolated communication cable.
Operating Modes
The four modes of operation are:
1: Constant current (CC).
2: Constant voltage (CV).
3: Constant resistance (CR).
4: Constant power (CW)
12
Constant Current(CC)Mode
I n this mode, the electronic load will sink a current in accordance with the programmed value regardless of the input voltage. CC mode can be set with front panel keys. The CC mode parameters are discussed in the following paragraphs.
I
LOAD
CURRENT
CURRENT
SETTING
LOAD INPUT
VOLTAGE
V
CONSTANTCURRENT MODE
Constant Resistance (CR) Mode
In this mode, the module will sink a current linearly proportional to the input voltage in accordance with the programmed resistance. The CR mode can be set at the front panel. The CR mode parameters are described in the following paragraph.
I
LOAD
CURRENT
SLOPE
RESISTANCE
SETTING
LOAD INPUT
VOLTAGE
V
CONSTANT RESISTANCE MODE
Constant Voltage (CV) Mode
In this mode, the electronic load will attempt to sink enough current to control the source voltage to the programmed value. The module acts as a shunt voltage regulator when operating in the CV mode. The
CV mode can be set at the front panel. The CV mode parameters are described in the following paragraphs.
V
LOAD INPUT
VOLTAGE
VOLT
SETTING
LOAD CURRENT I
CONSTANT VOLTAGE MODE
13
Constant Power (CW) Mode
In this mode, the electronic loads will consumption power accordance with the programmed value regardless of the input voltage. The CW mode can be set with front panel keys. The CW mode parameters are discussed in the following paragraphs.
V
LOAD INPUT V2
VOLTAGE
V3
POWER
SETTING
I2 I3
LOAD
CURRENT
CONSTANT POWER MODE
I
Transient Operation
Transient operation enables the electronic load to periodically switch between two load levels, as might be required for testing power supplies. A power supply's regulation and transient characteristics can be evaluated by monitoring the supply's output voltage under varying combinations of load levels, frequency, and duty cycle.
Transient operation can be turned on and off at the front panel or PC via the IT-E131 isolated communication cable. Before you turn on transient operation, you should set the desired mode of operation as well as all of the parameters associated with transient operation. Transient operation may be used in the CC, CR, or CV or CW modes and can be setup in continuous, pulsed, or toggled operation mode.
Continuous
Generates a repetitive pulse stream the toggles between two load levels and change the state between value A and value B.
10A
5A
2.0ms
3.0ms
Continuous Transient Operation
Pulse
Switch to value B as receiving one trigger signal , taking the pulse time(TWD) of value B , Load will return to Value A .
14
10A
5A
TWD
10ms
TWD
10ms
TRIG TRIG
Pulsed Transient Operation
Trigger Mode
Switching the state between value A and value B once receiving a triggering signal
10A
5A
TRG
TRG
Toggled Transient Operation
List Operation
List mode lets you generate complex sequences of input changes with rapid, precise timing, which may be synchronized with internal or external signals.
List operation can be changed by edit every step value and time in list operation. The parameter of list operation include the group file name, input step setting
(the max steps is 1000 steps),time of one step(1mS~1h)and setting value of one step. In CC mode, dwell time range is 1mS to 6S, which also have an associated value. Note that lists data can only be saved in total 1000 steps memory of 4 situations.
GROUP Total = 1000 steps
2
4
8
500 steps 500 steps
250 steps 250 steps 250 steps 250 steps
120 steps 120 steps 120 steps 120 steps 120 steps 120steps 120 steps 120 steps
When receiving one trigger signal, it will start the list operation until receiving another trigger signal or finish the List operation.
Trigger
0 1 2 3 4 5
List count=1
List sequence
List count=2
15
Triggered Operation
The electronic load has various triggering modes to allow synchronization with other test equipment or events. Such as:
Keypad triggering mode: Press
Shift
+
Trigger
to trigger the electronic load.
TTL triggering mode: Send a high pulse with a constant time more than 5m Sec to the trigger terminals in rear panel to trigger the electronic load.
Command triggering mode: Send triggering command to the electronic load via the serial port.
Input Control
Short On/Off
Load can simulate a short circuit at its input by turning the load on with full-scale current. The short circuit can be toggled on/off at the front panel using the
Shift
+
Short
.Short operation is not influence the operation setting current value , When short operation is on OFF state , Load back to the original setting state.
The actual value of the electronic short is dependent on the mode and current range that are active when the short is turned on.
In CC, CW and CR mode, the max short-circuit current value is 1.2 times of the current range. In CV mode, short-circuit operation is same as the operation of setting CV to 0V.
NOTE
Turning the Short Test on in CV mode may cause the load to draw so much current that the software current limit operates, which may turn the input off. Turning the short circuit on does not affect the programmed settings, and the load input will return to the previously programmed values when the short is turned off.
Input On/Off
Electronic load's input can be toggled on/off at the front panel. Turning the input off (zero current) does not affect the programmed settings. The input will return to the previously programmed values when the input is turned on again.
NOTE
The Input On/Off command supersedes the mode commands and Short Test
On/Off command.
16
Operation Range
Work in the range of Rated Current, Rated voltage and Rated Power, The figure is as following:
Rated voltage
Rated power
Input current I Rated current
Operation mode change state
Rated voltage
C
Software Power Limit
Software Current Limit
A
Input current I Rated current
Protection Features
Electronic load includes the following protection features:
Over Voltage
If input voltage exceeds the voltage limit set by the user, the DC load will turn the input OFF and the buzzer will turn on. The display will show OVER VOLTAGE as following. The maximum voltage limit value is equal to 100%+5% of the maximum rated voltage for each model.
OVER VOLTAGE
Over Current
When operating in CR, CC or CP mode, the load current will be limited by a current limit value set by the user. The maximum current limit value is equal to the maximum rated current for each model. Once the maximum current limit is reached, the DC Load will enter the over current protection state. If the DC load previously operated CR or CP mode, the DC load will automatically revert to CC mode and the VFD display will indicate CC. When the DC load operates in a combined CV / transition mode or CV / List mode, the buzzer will sound if the input current exceeds the current limit and the display will show a flashing current value.
Over Power
If the input power exceeds the power limit in the normal operation mode, Load will work in the over power protection state. VFD displays the information as CW.
17
When work in transition mode and list mode, if the input power exceeds the power limit. Buzzer is mooing, VFD display the flashing current value and voltage value.
Reverse Voltage
This feature protects the load module in case the input DC voltage lines are connected with wrong polarity, if a reverse voltage condition is detected, Buzzer is mooing. VFD display as following:
REVERSE VOLTAGE
Over Temperature
If internal power components ‘s temperature exceeds safe limits (80℃), Over temperature protection is on work . Load will turn off the input and Buzzer is mooing, VFD display as following:
OVER HEAT
Remote Sense Function
When work in CC, CV, CR and CP mode, if load consumes biggish current, it will cause one depressed voltage in the connection line between tested machine and terminals of Load. In order to assure testing precision, Load provides one remote testing terminals in the rear panel, Users could test the output terminals voltage of tested machine through it. Users should set the Load in
REMOTE mode before using the function.
4 Pin trigger and remote sensing connectors:
+ _
IN
Sense
A
Trigger
B
.
Remote Sensing: SENSE (+) and SENSE (–) are the remote sensing inputs. By eliminating the effect of the inevitable voltage drop in the load leads, remote sensing provides greater accuracy by allowing the load to regulate directly at the source's output terminals.
TRIG: A TTL-compatible input that responds to external edge trigger signal. A trigger applied to this input can be used to change settings (voltage, current, resistance, etc.), toggle between settings in transient-toggle mode, or generate a pulse in transient-pulse mode.
You must set the remote sense mode in the menu before using the remote sense function.
Action:
(
(
1) Press
Shift
+
Menu key into the menu
2) VFD displays >CONFIG, press
Enter key to confirm
(
3) Press key to choose>REMOTE SENSE, press
Enter key to confirm
18
(
4) Press / to choose>ON, press
Enter has been set.
Wiring diagram for remote sense
key to confirm. And the remote sense function
Input port in front panel
+
-
+
-
UUT
Sense port in rear panel
+
-
Saving and Recalling Settings
The electronic load has internal registers in which settings (mode, current, voltage, resistance, transient level, etc.).Users could use recall the relative data as following:
Shift
+
Store
and
Shift
+
Recall
to save and
CC value /CW value /CR value /CV value
Transition current A value /Transition current B value /Transition voltage A value /Transition voltage
B value / Transition power A value /Transition power B value /Transition Resistance A value
/Transition Resistance B value
Current A pulse width time/ Current B pulse width time/Voltage A pulse width time/ Voltage B pulse width time /Power A pulse width time/Power B pulse width time /Resistance A pulse width time
/Resistance B width time
Transition current testing mode/Transition voltage testing mode/Transition power testing mode
/Transition resistance testing mode
Max current value / Max voltage value / Max power value
Action
1) Press
2) Press
3) Press
Shift
Shift
, set a value of current or voltage, press
+
Store
Enter
set a store code at random, press
to confirm.
Enter
to confirm.
+
Recall
,
set the store code that you set before, press you can get the number stored.
Enter to confirm, then
Battery Testing
Experiment proves the test with load is the best method to ensure the battery whether work well or not. Only with the correct load testing, the battery can be confirmed if it was being the expectant life curve location. The electronic loads can be used to test any type of the battery nowadays.
As the accumulator is used by any sheltered equipment or the uninterrupted service system, it is
19
necessary to use the load testing. Because the battery nearly is the lowest reliability component, so it must use the load testing periodic ensure the security of the battery.
Capability test
Electronic load uses CC mode to do the capability test. Make a program to set the voltage in off state.
The accumulator have too low voltage, electronic load intermits test if system checks the accumulator which is near to one rating or in insecurity state. In testing procedure, you could see the accumulator voltage, discharge current, electronic load power and spare capability of accumulator. If connecting with PC software, discharge curve could be displayed in window. This test can reflect the reliability and using time of accumulator. So, it’s necessary to do the test before you change another new accumulator.
Operation:
1. Turn off the load, connect with the tested battery.
2. Press then press
3. Press
Shift
, VFD display CURRENT= *****A. Setting the discharge current of the battery,
Enter to confirm.
+
, VFD display MIN VOLT= ****V, Setting the voltage when turned off,
Press
Enter
to start the capacity testing. When the battery voltage is same as the voltage without power, the load turns off.
During the testing, use ▼and ▲ to change the voltage , actual discharge current ,the electronic load power and the released discharge capacity of the battery .
4. Then press
Shift
+
Battery
, exit the battery capacity testing mode.
V
Battery Voltage
Min voltage
t
I
Load Sink Current
t
20
Von/Voff Operation
You can set voltage value Von/Voff to control the input state on/off for electronic load. When the input voltage reaches the Von value, the load’s input state is on. When the input voltage reaches the
Voff value, the load’s input state is off.
Action for set Von/Voff value:
(
1) Press
Shift
+
Menu
into menu
(
2) VFD displays >CONFIG, press key to choose >SYSTEM SET, press
Enter
to confirm
(
3) VFD displays >MAX CURRENT SET, press key to choose>VOLTAGE ON SET, press
Enter key to confirm
(
4) VFD displays >VOLT.ON=0.00V, press numeric keys to set Von value (0.1V to max voltage value), press
Enter to confirm
(
5) Press key to choose >VOLTAGE OFF SET, press
Enter to confirm
( 6) VFD displays >VOLT.OFF=0.00V, press numeric keys to set Voff value (0V to max voltage value), press
Enter to confirm
Installation
Inspection
Damage
When you receive your electronic load, inspect it for any obvious damage that may have occurred during shipment. If there is damage, notify the shipping carrier and nearest Agent office and Support Office immediately.
Items Supplied
The following user replaceable items are included with your electronic load.
Item
Power Cord
Part Number
IT-E171
Description
Users will get one of the power
IT-E172
IT-E173 cords appropriate for your location.
21
IT-E174
User's Guide
Contains installation, checkout, and front panel information and
Software CD-Rom
Programming
Calibration Report
The Instrument calibration report.
Cleaning
Use a dry cloth or one slightly dampened with water to clean the external case parts. Do not attempt to clean internally.
WARNING
To prevent electric shock, unplug unit before cleaning.
Location
The outline diagram in following figure gives the dimensions of your electronic load. The electronic load must be installed in a location that allows sufficient space at the sides and back of the unit for adequate air circulation.
Installation
Dimension :214.5mmW x 88.2mm H x 254.6mm D
Terminal length: 29.4mm Feet height:17.5mm
Outline Diagram
Unit (mm)
22
Carrying Handle
Bench Operation
A fan cools the electronic load by drawing air through the button and sides and exhausting it out the back.
Minimum clearances for bench operation are 25 mm along the sides.
CAUTION
Do not block the fan exhaust at the rear of the Load.
Rack Mounting
The IT 8500 series electronic load can be mounted in a standard 19-inch rack. Rack mount kits are available as Option IT-E151. The electronic load can be mounted in a standard 19-inch rack panel or enclosures using an Option IT-E151 rack mount kit. A rack mount kit for joining two half-rack units is also available by using Option IT-E151.
Rack Installation
Elevation for Installation one electronic load in a standard 19-inch rack
23
Side elevation for Installation one electronic load in a standard 19-inch rack
Elevation for Installation two electronic loads in a standard 19-inch rack
NOTE
Remove the carrying handle and the two plastic ears before rack-mounting the instrument. To remove the handle, grasp the handle by sides and pull outwards and rotate it to a special position to let the arrow on the handle oppose the other arrow on the plastic ears, then pull the handle outward.
After removing the handle, you can use a screwdriver to remove the two plastic ears.
Input Connections
Power Cord
Connect the power cord to the IEC 320 connector on the rear of the unit. If the wrong power cord was shipped with your unit, contact your nearest Agent to obtain the correct cord. See following figure for the part number and ordering options.
24
WARNING
SHOCK HAZARD: the power cord provides a chassis ground through a third conductor. Be certain that your power outlet is of the three-conductor type with the correct pin connected to earth ground.
NOTE
The detachable power cord may be used as an emergency disconnecting device. Removing the power cord from the ac input connector will disconnect ac input power to the unit.
E
N
E
L
E
L N
N
E
L
L N
China United States, Canada Europe United Kingdom
IT-E171 IT-E172 IT-E173 IT-E174
Turn-On Checkout
Introduction
Successful tests in this chapter provide a high degree of confidence that the electronic load is operating properly.
Checkout Procedure
The test in this section checks for proper operation of the electronic load. If you have not already done so, connect the power cord to the unit and plug it in.
Procedure Display Explanation
1. Turn the unit on.
The electronic Load undergoes a self-test when you First turn it on.
During self test, all segments are briefly lit
2. Wait for 1s after turn on electronic load.
EPROM ERROR
EEPROM damage or Lost data of last power off
Run well if no such display, system will go to the step 3 directly.
3. Wait for another 2S. ERROR CAL.DATA
EEPROM Lost calibration data
Run well if no such display, system will go to the step 4 directly.
25
4. Press Shift button and
△▽ keys .
LOAD MODEL:IT85XX
SN:XXX-XXX-XXX
VER x.xx
5. Press
ESC
button
6.Press △▽
0.000V 0.000A
0.000W I: 0.000A
Display the information of the product Type, series number version of software.
Display the actual input voltage and current value.
Display the actual power value and setting value.
In Case of Trouble
Electronic load failure to run during power-on operation. The test of following in this section help you to solve the possible problem when you turn on the power of electronic load.
1) Make sure if you have connected the power cord to the unit and plug it in. Power switch have been pressed.
2) Check the power voltage setting.
Work voltage of load have two type 110V or 220V , Please make sure it is right voltage accordance to the voltage in your area. You could change the voltage setting through dial the switch in the rear panel.
3) Check the fuse of load.
If fuse is blowout, please change it as following specification.
Model Fuse specification
(110VAC)
Fuse specification
(220VAC)
IT8511
IT8512
T0.5A 250V
T0.5A 250V
IT8511B T0.5A 250V
IT8512B T0.5A 250V
IT8512C T0.5A 250V
T0.3A 250V
T0.3A 250V
T0.3A 250V
T0.3A 250V
T0.3A 250V
4) Location of Fuse
FUSE
26
Front Panel Operation
Example
I-set (set up a constant current from 0 to Max current )
Set up a constant DC current input is the first main function of programmable DC electronic load,
IT8500 series electronic load provides two methods to set up the constant DC current input by using the number keyboard and the rotary button. Please see the following operation procedure.
Procedure Operation details VFD display
CURRENT=0.000A Step 1
Press
Step 2
Enter the password or jump the step 4 if your password for reentering
Enter the original value which
Step 3
Step 4
displayed in the LCD or enter a new value by using number keys or Rotary knob to adjust the voltage value
Press
Enter
to confirm
Setup the input current at 4.33A.
Method 1: To set up by using number keyboard
PASSWORD:
CURRENT=*.***A
0.00V 0.000A
Step1. Press button.
Step2. Press numeric button to enter the current value 4.33.
Step3. Press
Enter
button to confirm the current value.
Method 2: To set up by using Rotary SW
If the key board is unlocked by password, directly adjust the Rotary SW button, and voltage will be continually changed from the previews value according the rotation. At the beginning, the cursor will be shown on the last number of the value which is indicated on the VFD, you can move the cursor to the first number, second number etc by using number buttons, and then adjust the Rotary SW to change each number, and let it stay at *.** A. Please see the following description. Then press I-set to confirm the value.
0.00A 0.00V
0.0W 4.33A
Procedure:
Step1. Press button,
Step2. Adjust the Rotary knob to change the value, the operation is as the same as item (1)
Step5. Press
Enter button to confirm the current value.
27
P-set (set up a constant power from 0 to Max power)
IT8500 series electronic load can be set up for a constant power.
Constant power setup procedure is as following:
Procedure
Step 1
Step 2
Step 3
Press
Operation details
P-set
Enter a new value by using numeric keys or Rotary knob to adjust the voltage value
Press
Enter
to confirm.
VFD display
POWER =0.0W
POWER=*.***W
0.000W P:*.000W
R-set (set up a constant resistance from 0.1Ω to 4000Ω)
IT8500 series electronic load can be setup for a constant resistance.
Constant resistance setup procedure is as following:
Procedure Operation details
Step 1
Press
R-set
VFD display
RESISTANCE =0.0R
Step 2
enter a new value by using numeric keys or
Rotary knob to adjust the resistance value
RESISTANCE=*****R
Step 3
Press
Enter
to confirm.
0.000W R:0000R
V-set (set up a constant voltage from 0.1V to Max voltage)
IT8500 series electronic load can be setup for a constant voltage.
Constant voltage setup procedure is as following:
Procedure Operation details VFD display
Step 1
Press
VOLTAGE=1.500V
Step 2
enter a new value by using numeric keys or
Rotary knob to adjust the resistance value
Step 3
Press
Enter
to confirm.
VOLTAGE=*.***V
0.000W V:3.000V
Shift + Store
Procedure
Step 1
Step 2
Press
Press
Shift
Operation details
and
Store
Enter
to confirm.
Shift + Recall
Procedure
Step 1
Step 2
Operation details
Press
Press
Shift
Enter and
Recall
to confirm
28
VFD display
STORE 1
Store the relative data
VFD display
RECALL 1
Recall the saving data
In On/Off input setting
Use
On/Off
On/Off
. to change the input state of electronic load. Switch on to off state by press
On/Off
.
Transition Parameter Setting
Users could press
Shift
+
Shift
S-Tran
+
S-Tran to set the transition parameter.
LEVEL A =0.000A
Setup value A
Enter
WIDTH A = 0.5mS
Setup time width of value A
Enter
Enter
Enter
Enter
LEVEL B=0.000A
WIDTH B= 0.5mS
>CONTINUOUS
>PULSE
>TOGGLED
Setup value B
Setup time width of value B
Choose one of the three transition modes
Finish transition setting
Continuous Transient Operation
In this mode, electronic load will generates a repetitive pulse stream that toggles between two load levels. ; Load could switch the state between two setting value (value A and value
B).
In this following example, assume that the CC mode is active; the applicable transient operation parameters have been set as follows.
For example:
Continuous mode, current level A =5A, width = 2mS. Current level B =10A, width = 3ms. Testing machine input voltage is 12V.
10A
5A
2.0ms
3.0ms
Continuous Transient Operation
Action
1. Select the operation mode (CC,CV,CR or CP), and set a proper value, press the load input.
On/Off
to turn off
2. Press
Shift
+
S-Tran
,
set LEVEL A=5A, press
Enter
, set WIDTH A=3mS, press
Enter
, set LEVER B=10A, press
6. Press
Enter
, set WIDTH B=2mS, press
, the input of load is powered on.
Enter
3. Transition mode now is CONTINOUS, press
4. Press
5. Press
Shift
Shift
+
+
Tran
Tran
Enter to confirm. to activate the transient mode. again to stop the transient operation.
On/Off
29 to confirm.
Pulse Transient Operation
In this mode, generates a transient pulse of programmable width when pulsed transient operation is in effect.
For example: When load receiving one trigger signal, it will switch to 10A current value, and taking
10mS to return the current value of 5A.
10A
5A
TWD
10ms
TWD
10ms
TRIG TRIG
Pulsed Transient Operation
Action
1. Select the operation mode (CC,CV,CR or CP), and set a proper value, press the load input.
On/Off
to turn off
2. Press
Shift
+
S-Tran now is CONTINOUS.
,
set LEVER A=5A, LEVER B=10A, WIDTH B=10mS. Transition mode
3. Press ▼ till >PULSE.
4. Press
5. Press
6. Press
7. Press
Enter
Shift
Shift
Shift
, set transient mode is PULSE.
+
Tran to activate the transient mode.
+
Trigger to start another pulse. Press
Shift
+
Tran again to stop the transient operation.
+
8. Press
On/Off
, the input of load is powered on.
.
Trigger
, get more pulse.
Toggled Transient Operation
In this mode, after transition operation start, Load could change the input between the main level and the transient level when toggled transient operation is in effect.
For example:
When Load receives one trigger signal, Load current will switch between 5A and 10A.
10A
5A
TRG
TRG
Toggled Transient Operation
Action
1. Press
2. Press
3. Press
Shift
Shift
Shift
+
S-Tran
, Setting LEVER A=5A, LEVER B=10A, transition mode is TOGGLED.
+
Tran to activate the transient mode.
+
Trigger switch to the current value of 10A.
30
4. Press
5. Press
Shift
Shift
+
Trigger
, switch between 5A and 10A.
+
Tran again to stop the transient operation.
List Operation
Users can use the front panel keypad or Power View 8500(PV8500) software to programming the list sequence. Please refer to the software user’s guide.
The following example will help you how to do the list operation in front panel.
Trigger
0 1 2 3 4 5
List count=1 List count=2
List sequence
Action
1) Press the button of
2) Press
Shift
+
On/Off
Menu
, execute the input of Load I in OFF state.
, move cursor to the option of menu of CONFIG, Press the next step menu, move cursor to TRIGGER SOURCE. Press
Enter
Enter
into and move cursor to
IMMEDIATE <DEF>, setting trigger source mode is panel IMMEDIATE mode.
3) Press
Enter
to confirm.
to the previous menu, move cursor to LIST SET.
5) Press
Enter
6) Press
MODE.
Enter into the next step menu .move cursor to EDIT LIST FILE. into the next step menu, move cursor to CURRENT LIST, select CURRENT
7) Press
9) Press
Enter
8) Press
Enter
Enter
10) Press
Enter
, move cursor to REPEAT. Setup LIST is in cycle mode.
to confirm, setup the list steps = 5.
to confirm, setup step 1 current =3A.
to confirm, setup step 1 width=6mS.
11) Repeat 7) and 8) operation , set current and width of one step 0A, 5mS;2A,
4mS;6A,2mS;0A,5mS.
12) Press
Enter
to confirm, Menu STORE LIST FILE 1, save file in group1.
13) Move cursor to Mode Set , press
Enter
to enter into the next step menu to set mode is
<LIST MODE >
14) Press
Enter
to confirm
15) Press
Esc
, Press
On/Off
, make Load in ON state. Press
Shift
+
Trigger
, make list operation run or stop.
16) Stop the list operation mode. Move cursor to LIST SET, press
Set in option menu, press
Enter
Enter
, move cursor to Mode
, enter into next step menu. Select mode is <FIXED
MODE>.
17) Press
Enter
to confirm.
31
Fast Recall Function
You recall 10 groups numbers very conveniently which were stored before.
Action
1) Press
Shift
+
Menu
2) Press▼to CONFIG, press
Enter
into submenu, press▼ to SHORTCURT RECALL
3) Press
Enter
, select >ON and press
Enter
to confirm.
4) Press
Esc
two times and quit the menu.
5) Press
1
and you can get the first group number. Press
2
, you can get the second group number. Press
0
, you can get the tenth group number. And if there is not stored number, VFD will show NO EEPROM DATA.
Automatic Testing Function of Electronic Load
You test various parameters of power supplies at different loads. Now we take a kind of charger as an example to explain the usage of the automatic testing of the electronic load.
The test proceeding of R35 charger process Test Method
1 st
step
2 nd
step
3 rd
step
4 th
step
CC
None
CC
CV
5 th
step
CV
6 th
step
Short circuit
5.8~6.15
5.9~6.4
5
3
2
0
210
0
205~245
205~245
205~245
≤245
≤4(input175VAC)
≤1.2(input175VAC)
≤50mVpp
Edit the Testing File
1) Press
Shift
+
Menu
2) Press▼ to >LIST SET.
into menu, VFD displays >CONFIG
3) Press
Enter into submenu, press▼ to>EDIT LIST FILE.
4) Press
Enter and begin to edit the automatic testing file, VFD shows MAX CURR=
20.000A, which means setting the maximum of voltage. The maximum is bigger than 3A, which means CC mode is in high range, here, the maximum is 3A. Press press
Enter
to confirm.
3 and
5) VFD displays MAX VOLT=120.00V, which means setting the maximum of voltage, the maximum is bigger than 18V, which means CV is in high range, here ,the maximum is
18V. Press
1
+
8
to set MAX VOLT=18V, press
Enter to confirm.
6) VFD displays MAX POWER=200.00W, which means setting the maximum of power, here, it is150W, Press
1
+
5
+
0
to set MAX POWER=150W, press
Enter
to confirm.
32
7) VFD displays TEST COUNT=2, which means setting steps of testing, 20 steps are permitted at most, here, they are 6 steps. Press
Enter
to confirm.
6
to set TEST COUNT=6, press
8) Setting the mode of current procedure, press ▲、▼to choose one mode in CONST
CURRENT、CONST VOLTAGE、CONST POWER、CONST RESIS. Here, the first step is CC mode, press ▲、▼to >CONST CURRENT, press
Enter to confirm.
9) VFD shows SET 1=20.000A, which means setting the current procedure. Here, the first sis 0.21A, press
0
+
●
+
2
+
1
, then press
Enter to confirm.
10) Setting whether the current procedure is short circuit or not, press ▲、▼to choose one in
SHORT ON or SHORT OFF. Here the first step is SHORT OFF. Press SHORT OFF, press
Enter to confirm.
11) Select the test number of this step, press▲、▼ to choose >READBACK V,
PRESS
Enter to confirm.
12) VFD displays MIN 1=120.00V, which means setting the lower limit. Here, the first step is
5.8V. Press
5
+
●
+
8
, press
Enter to confirm.
13) VFD displays MAX 1=120.00V, which requests setting the upper limit. Here, the first step is 6.15V, press
6
+
●
+
1
+
5
,then press
Enter to confirm.
14) VFD shows DELAY 1= 1.0〈S〉, which means setting the prolong time, that is how long we can read the testing value after inputting the value we settled. To wait for testing after the input stable, the range of prolong time is 0~25.5 seconds, when the setting is 25.5 seconds, automatic testing will be pause, only the user press
Shift
+
Trigger
,the testing will continue. Here, the first step is 1 second, press confirm.
1 and then press
15) Repeat 9)~14), and set the other process step by step as follows:
Enter to
A. CONST CURRENT,0A,SHORT OFF, READ BACK V, 5.9V, 6.4V,1S
B. CONST VOLTAGE, 5V, SHORT OFF,READ BACK A, 0.205A, 0.245A,1S
C. CONST VOLTAGE, 3V, SHORT OFF, READ BACK A, 0.205A,0.245A,1S
D. CONST VOLTAGE, 2V,SHORT OFF, READ BACK A, 0.205A,0.245A, 1S
E. CONST CURRENT, 0A, SHORT ON, READ BACK A,0A,0.245A, 1S
16) VFD displays SHORT TEST FILE*, which requests saving the files edited to EEPROM, automatically testing files and LIST files use a common memory area, and the area can contain 8 groups of automatic testing files for next usage. Here, the testing file could be saved in the first group, press
1
and press
Enter to confirm.
17) When the edition of automatic testing file is finished, press
Enter menu.
two times to back the
Fast Recall the Test File
1) Press
Shift
+
Menu to enter into menu, VFD displays>CONFIG
2) Press▼ and move the menu to>LIST SET
3) Press
Enter to enter into submenu, VFD displays>MODE SET
4) Press▼ and move the menu to>CALL TEST FILE
5) Press
Enter and recall the file edited
33
Automatic Testing
After editing the automatic testing file, the automatic testing could be carried out by the below steps.
1) Press
Shift
+ to enter into automatic testing, VFD displays the name of current file:
NAME: TEST FILE1
2) Press
Enter to observe the voltage and current we inputted, and also can observe the step number of testing.
3) Press
Shift
+
Trigger and begin to operate, when the automatic testing is pause (the current prolong time of one step is 25.5S), press
Shift
+
Trigger also can make the testing continue.
4) When the automatic testing is finished, the buzzer will hint by tweet (buzzer), VFD reads the result of testing. If the testing passed, VFD reads PASS, or reads FAULT. Press▲、▼ also to observe the numerical value and result of every step.
5) Press
Esc to back the automatic testing.
Select the Resolution between Low Range and High Range
You can adjust the resolution by selecting the low and high range. The first step you should do is to enable this function in the menu.
Action
1) Press
Shift
+
Menu to enter into menu, VFD displays>CONFIG
2) Press
Enter into the submenu, VFD displays>INITIAL CONFIG
3) Press▼to make VFD display RANGE SELECT
4) Press
Enter to confirm, and press▼to choose ON
5) Press
Enter
to confirm
6) Press
Esc
to exit menu
Then you can press
Shift
+▲ to change the voltage range (maximum voltage). If the former maximum voltage value is 120V and the resoulution is 10mV, it will become 18V when you press
Shift
+▲ , and you will get 3 decimal points (xx.xxx) compared to 2 decimal points before.
Wheras if the former maximum voltage is 18V, you can press
Shift
+▼ to make it become
120V, also the resolution will become as 10mV.
On the other hand, you can press
Shift
+▼ to change the currnet range (maximum current). If the former maximum current value is 12A and the resolution is 1mA, it will become 120A when you press
Shift
+▼, and you will get 2 decimal points (xx.xx) compared to 3 decimal points before. wheras if the fromer maximum current is 120A, you can press
Shift
+▼ to make it become 12A, and the resolution will become as 1mA.
34
Parameter
Input rating
( 0 ~ 40 ℃)
Voltage
Current
Power
Range
Specifications
IT8511 IT8512 IT8511B IT8512B
0 to 120V
1mA to 30A
150 W
Accuracy
0 to 120V
1mA to 30A
300 W
Resolution
0 to 500V
1mA to 15A
150 W
Accuracy
IT8511C
0 to 500V 0-120V
1mA to 15A 1mA to 60A
300 W
Resolution
150 W
Accuracy
IT8512C
0-120V
1mA to 60A
300 W
Resolution
Load
Regulation
0-18V ±(0.05%+0.02%FS) 1mV ±(0.05%+0.02%FS)
0-120V / 500V ±(0.05%+0.025%FS) 10mV ±(0.05%+0.025%FS)
0-3A/6A
0-30A/15A/60A
±(0.1%+0.1%FS)
±(0.1%+0.1%FS)
0.1mA
1mA
±(0.1%+0.1%FS)
±(0.1%+0.1%FS)
1mV
10mV
0.1mA
1mA
±(0.05%+0.02%FS)
±(0.05%+0.025%FS)
±(0.1%+0.2%FS)
±(0.15%+0.2%FS)
1mV
10mV
0.2mA
2mA
CV Mode
Regulation
CC Mode
Regulation
CR Mode
Regulation
Input current ≥FS 10%
Input Voltage≥FS 10%
0.1-18V ±(0.05%+0.02%FS) 1mV ±(0.05%+0.02%FS)
0.1-120V/500V ±(0.05%+0.025%FS) 10mV ±(0.05%+0.025%FS)
0-3A/6A
0-30A /15A/60A
±(0.05%+0.1%FS)
±(0.1%+0.1%FS)
0.1mA
1mA
±(0.05%+0.1%FS)
±(0.1%+0.1%FS)
1mV ±(0.05%+0.02%FS)
10mV
0.1mA
1mA
±(0.05%+0.025%FS)
±(0.1%+0.1%FS)
±(0.15%+0.25%FS)
1mV
10mV
0.1mA
1mA
±(1%+0.3%FS) 0.001Ω ±(1%+0.3%FS) 0.001Ω
10-99Ω ±(1%+0.3%FS) 0.01Ω ±(1%+0.3%FS) 0.01Ω ±(1%+0.3%FS) 0.01Ω
1K-4KΩ ±(1%+0.8%FS) 1Ω ±(1%+0.8%FS) 1Ω ±(1%+0.8%FS) 1Ω
0-100W ±(1%+0.1%FS) 1mW ±(1%+0.1%FS) 1mW ±(1%+0.1%FS) 1mW CW Mode Regulation
Input current ≥FS 10%
Input Voltage≥FS 10%
100-300W ±(1%+0.1%FS) 10mW ±(1%+0.1%FS) 10mW ±(0.1%+0.1%FS) 10mW
0-3A/6A
Current Measurement
0-30A /15A/60A
±(0.1% + 0.1%FS)
±(0.2%+0.15%FS)
Voltage Measurement
0-18V ±(0.02% + 0.02%FS)
0-120V/500V ±(0.02%+0.025%FS)
0.1mA ±(0.1% + 0.1%FS) 0.1mA ±(0.1% + 0.2%FS)
1mA ±(0.2%+0.3%FS) 1mA ±(0.2%+0.5%FS)
1mV ±(0.02% + 0.02%FS)
10mV ±(0.02% + 0.025%FS)
1mV ±(0.02% + 0.02%FS)
10mV ±(0.02%+0.025%FS)
0.2mA
2mA
1mV
10mV
Power Measurement
Input current ≥FS 10%
Input Voltage ≥FS 10%
0-100W ±(1%+0.1%FS) 1mW ±(1%+0.1%FS) 1mW ±(1%+0.1%FS) 1mW
100-300W ±(1%+0.1%FS) 10mW ±(1%+0.1%FS) 10mW ±(1%+0.1%FS) 10mW
Battery testing function
Input=0.1-120V Max measurement capacity= 120AH
Resolution =10mA Timer range=1~60000sec
Range of Frequency 0.1Hz-1kHz Frequency error rate<0.5% Transition Mode
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Remote Operation Mode
DB9 in the rear panel of electronic load could connect with RS-232 through on TTL connector. The following information may help you to know how to control the output of electronic load through PC.
1 Communication cable
IT-E131 RS232 Communication cable
The DB9 interface connector on the rear panel of electronic load is TTL voltage level; you can use the communication cable (IT-E131) to connect the DB9 interface connector of the electronic load and the RS-232 interface connector of computer for the communication.
PC
IT-E131 communication cable
IT
IT-E131 ISOLATED
COMMUNICATION CABLE
RS232 ISOLATION TTL(5V)
859666668889942311
RX
TX
Load
IT-E132 USB Communication cable
The DB9 interface connector on the rear panel of electronic load is TTL voltage level; you can use the communication cable (IT-E132) to connect the DB9 interface connector of the electronic load and the USB interface connector of computer for the communication.
PC
cable
IT
RS232
IT-E131 ISOLATED
COMMUNICATION CABLE
ISOLATION TTL(5V)
859666668889942311
RX
TX
Load
IT-E134 GPIB Communication Cable
The DB9 interface connector on the rear panel of electronic load is TTL voltage level; you can use the communication cable (IT-E134) to connect the DB9 interface connector of the electronic load, and then connect GPIB interface connector of IT-E134 cable and computer with GPIB/IEEE 4888 line for the communication.
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IT-E134 outer communication adapter
COM interface of
Electronic load
GPIB line
IT-E134 ISOLATED
Serial /IEEE 488 Controller
Note: Forbidden to connect DB9 connector in electronic load directly with PC or other RS232 port.
2 Communication between electronic load and PC
Before using the remote operation mode, please make sure that the baud rate and communication address in electronic load are the same as in the computer software, otherwise, the communication will fail, you can change the baud rate and communication address from the front panel or from computer.
1. Address: the range is from 0 to 254,default setting is 0
2. Baud rate: 4800,9600,19200 and 38400 are selectable, default setting is 4800
3. Data bit:8 bit
4. Stop bit:1
5. Parity:None
Parity=None
Start Bit
8 Data Bits
Stop Bit
Stop Bit
1. DB9 Interface Details
DB9 in the rear panel of electronic load is TTL level signal .it can be connecting with standard PC interface through the IT-E131 isolated communication cable.
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