Maynuo Electronic M97, M9712, M9711, M9712B, M9712C User Manual
...
USER’S Guide
Programmable DC Electronic Load
Model M9711 M9712 M9712B M9712C M9712B30
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ContentUSER’S Guide.....................................................................................................................i
Programmable DC Electronic Load....................................................................................................i
Model M9712 M9712B M9712C M9712B30.....................................................................................i
Chapter 1 Overview...............................................................................................................................1
Chapter 2 Technical Specifications........................................................................................................2
2.1 Main Technical Specifications.................................................................................................2
2.2 DC Electronic Load Dimensional Line Drawings...................................................................4
Chapter 3 Quick Reference....................................................................................................................5
3.1 Power-onself-test......................................................................................................................5
3.2 In the Event of a Problem........................................................................................................5
3.3 Front Panel Operation and Back Panel Operation ................................................................6
3.4 Keypad Directions ....................................................................................................................7
3.5 Menu Operation........................................................................................................................8
Chapter 4 Panel Operation...................................................................................................................11
4.1 Basic Operation Mode............................................................................................................11
4.1.1 Constant Current Operation Mode (CC) .......................................................................11
4.1.1.1 Setup a Standard Constant Current Mode......................................................................11
4.1.1.2 Loading and Unloading Constant Current Mode...........................................................12
4.1.1.3 Soft Start Constant Current Mode.................................................................................13
4.1.1.4 Constant Current Mode Shifting into Constant Voltage Mode.......................................13
4.1.2 Constant Resistance Operation Mode (CR) .............................................................14
4.1.2.1 Setting up a Standard Constant Resistance Mode...............................................15
4.1.2.2 Loading and Unloading Constant Resistance Mode.............................................15
4.1.2.3 Shifting from Constant Resistance to Constant Voltage Mode............................16
4.1.3 Constant Voltage Operation Mode (CV)....................................................................16
4.1.3.1 Setting Up Standard Constant Voltage Mode........................................................17
4.1.3.2 Loading and Unloading Constant Voltage Mode...................................................17
4.1.3.3 SoftStart Constant Voltage Mode...........................................................................18
4.1.4 Constant Power Operation Mode (CW).....................................................................18
4.1.4.1 Setting up a Standard Constant Power Mode.......................................................19
4.1.4.2 Loading and Unloading Constant Power Mode.....................................................19
4.2 Dynamic Testing Operation...................................................................................................20
4.2.1 Continuous Mode (CONTINUOUS)...........................................................................20
4.2.2 Pulsed Mode (PULSED).............................................................................................20
4.2.3 Trigger Mode(TRIGGER)............................................................................................21
4.2.4 Setting up Dynamic test operational Parameters.....................................................21
4.2.5 Waveform Control........................................................................................................22
4.2.5.1 Square Wave............................................................................................................22
4.2.5.2 Triangular Wave.......................................................................................................22
4.2.5.3 Trapezoidal Wave.....................................................................................................22
4.2.6 Trigger Control.............................................................................................................22
4.2.7 List Function (Mode Sequence Steps)......................................................................22
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4.2.7.1. List Operation...........................................................................................................23
4.2.7.2 Executing List Function............................................................................................23
4.2.8 Automatic Testing Function........................................................................................23
4.2.8.1 Automatic Test Operation........................................................................................24
4.2.8.2 Setting up Automatic Test Trigger Output Mode...................................................25
4.2.8.3 Executing Automatic Test Function........................................................................25
4.3 Input Control............................................................................................................................26
4.3.1 Short Circuit Operation (SHORT)...............................................................................26
4.3.2 Input On/Off Operation ................................................................................................26
4.4 Electronic Load Operation Range.........................................................................................26
4.5 Protection Functions...............................................................................................................27
4.5.1 Over Voltage Protection (OV).....................................................................................27
4.5.2 Over Current Protection (OC).....................................................................................27
4.5.3 Over Power Protection (OW)......................................................................................28
4.5.4 Input Polarity Reversed...............................................................................................28
4.5.5 Over Heat Protection(OH)...........................................................................................28
4.6 Remote Measurement Function............................................................................................28
4.7 Battery Testing........................................................................................................................30
4.8 Communication protocol........................................................................................................31
4.8.1 Introduction...................................................................................................................31
4.8.2 Setup Baudrate............................................................................................................32
4.8.3 Data...............................................................................................................................32
4.8.4 Function Code..............................................................................................................32
4.8.5 Error checking (CRC)..................................................................................................32
4.8.6 Complete Command Frame Analysis ........................................................................33
4.8.7 Coil With The Register Address Allocation ...............................................................35
4.8.8 Definition Of The Command Register CMD..............................................................37
4.8.9 Common Operational Function Descriptions............................................................38
4.9 Remote operation...................................................................................................................42
4.9.1 M-131 or M-133 Communication Cable.....................................................................42
Quick Reminders.................................................................................................................................46
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Chapter 1 Overview
The new M97XX series programmable DC electronic load is a new generation product designed from
Maynuo Electronic Co.,Ltd. Incorporating high-performance chips, the M97XX series delivers high speed and
high accuracy with a resolution of 0.1 mV and 0.01 mA (basic accuracy is 0.03% and basic current rise speed is
2.5 A/μs). M97XX series have wide application from production lines for cell phone chargers, cell phone
batteries, electronic vehicle batteries, switching power supplies, linear power supplies, and LED drivers, to
research institute, automotive electronic, aeronautic and astronautic, maritime, solar celland fuel cell etc.test
and measurement applications.
FEATURES
• Six high speed operation modes: CC,CR,CV,CW,CC+CV,CR+CV
• Over current, over voltage, over power, over heating and polarity reversal protection
• High-luminance vacuum fluorescent display (VFD) screen with two line, four channel display
• Intelligent fan system will automatically activate based on changing ambient temperatures
• Soft-start time setting, activating the power supply in accordance with the set voltage value
• Battery test and short-circuit test functions
• Capable of rising edge and falling edge dynamic testing
• Supporting external triggeron either input or output
• External current waveform monitor terminal output terminal
• Supports remote voltage compensation and multi-data storage
• Power-on-self-test, software calibration and standard rack mountable
• Edits arbitrary waveforms in list function.
• Available with RS232/RS485/USB serial interfaces.
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Chapter 2 Technical Specifications
2.1 Main Technical Specifications
This User Manual covers only the M97XX programmable DC electronic loads. Please refer to the
following table that details the specific parameters of the150W-300W M97XX DC electronic loads.
3.5KgWeight
108*214*365W*H*D(mm)Dimension
–10℃～70℃
–10℃～70℃
–10℃～70℃
–10℃～70℃
Nonoperating
0～40
℃
0～40
℃
0～40
℃
0～40
℃
Operating
Temperature
≒
25m
Ω≒
300m
Ω≒
35m
Ω≒
55m
Ω
Resistance(C
R)
0V0V0V0VVoltage(CV)
66A
≒
6.6A
≒
18A
≒
3.3A
≒
33A
≒
3.3A
≒
33A
≒
3.3ACurrent(CC)
Short Circuit
CC soft-startup Time 1mS; 2 mS; 5mS; 10mS; 20 mS; 50 mS; 100 mS; 200 mS Accuracy: + 15% offset+10% FS
Dynamic Measurement Transition List: 0-25kHZ; 2.5A/uS; T1&T2:60uS-999S; Accuracy: + 15% offset+10% FS
Battery Measruement Battery Input: 0.5-120V; Max. Measurement: Capacity=999/H; Resolution=0.1mA; Time Range=1S-16HS
0.1%+0.1%FS0.1%+0.1%FS0.1%+0.1%FS0.1%+0.1%FS0.1%+0.1%FS0.1%+0.1%FS0.1%+0.1%FS0.1%+0.1%FSAccuracy
10mW1mW10mW1mW10mW1mW10mW1mWResolution
300W100W300W100W300W100W150W100WWattW Measurement
(Voltage and
current input
value ≥10% full
measument )
0.03%+0.08%FS0.03%+0.05%FS0.03%+0.08%FS0.03%+0.05%FS0.03%+0.08%FS0.03%+0.05%FS0.03%+0.08%FS0.03%+0.05%FSAccuracy
1mA0.1mA0.1mA0.01mA0.1mA0.01mA0.1mA0.01mAResolution
0-60A0-6A0-15A0-3A0-30A0-3A0-30A0-3ACurrent
I Measurement
0.015%+0.03%FS0.015%+0.03%FS0.015%+0.05%FS0.015%+0.03%FS0.015%+0.03%FS0.015%+0.02%FS0.015%+0.03%FS0.015%+0.03%FSAccuracy
10mV1mV10mV1mV10mV1mV10mV1mVResolution
0-150V0-19.999V0-500V0-19.999V0-150V0-19.999V0-150V0-19.999VVoltage
V Measurement
0.1%+0.1%FS0.1%+0.1%FS0.1%+0.1%FS0.1%+0.1%FS0.1%+0.1%FS0.1%+0.1%FS0.1%+0.1%FS0.1%+0.1%FSAccuracy
10mW1mW10mW1mW10mW1mW10mW1mWResolution
0-300W0-300W0-300W0-300W0-300W0-300W0-150W0-150WRangeCW Mode
(Voltage and
current input
value ≥10% full
measument )
0.1%+0.1%FS0.1%+0.1%FS0.1%+0.1%FS0.1%+0.1%FS0.1%+0.1%FS0.1%+0.1%FS0.1%+0.1%FS0.1%+0.1%FSAccuracy
16bit16bit16bit16bit16bit16bit16bit16bitResolution
0.03Ω-5K0.03Ω-10K0.3Ω-5K0.3Ω-10K0.03Ω-5K0.03Ω-10K0.03Ω-5K0.03Ω-10KRangeCR Mode
(Voltage and
current input
value ≥10% full
measument )
0.03%+0.02%FS0.03%+0.02%FS0.03%+0.02%FS0.03%+0.02%FS0.03%+0.02%FS0.03%+0.02%FS0.03%+0.02%FS0.03%+0.02%FSAccuracy
10mV1mV10mV1mV10mV1mV10mV1mVResolution
0.1-150V0.1-19.999V0.1-500V0.1-19.999V0.1-150V0.1-19.999V0.1-150V0.1-19.999VRange
CV Mode
0.03%+0.05%FS0.03%+0.05%FS0.03%+0.05%FS0.03%+0.05%FS0.03%+0.05%FS0.03%+0.05%FS0.03%+0.05%FS0.03%+0.05%FSAccuracy
1mA0.1mA1mA0.1mA1mA0.1mA1mA0.1mAResolution
0-60A0-6A0-15A0-3A0-30A0-3A0-30A0-3ARange
CC Mode
0-150V0-500V0-150V0-150VVoltage
0-60A0-15A0-30A0-30ACurrent
300W300W300W150WPower
Input Raitng
M9712CM9712BM9712M9711Model
3.5KgWeight
108*214*365W*H*D(mm)Dimension
–10℃～70℃
–10℃～70℃
–10℃～70℃
–10℃～70℃
Nonoperating
0～40
℃
0～40
℃
0～40
℃
0～40
℃
Operating
Temperature
≒
25m
Ω≒
300m
Ω≒
35m
Ω≒
55m
Ω
Resistance(C
R)
0V0V0V0VVoltage(CV)
66A
≒
6.6A
≒
18A
≒
3.3A
≒
33A
≒
3.3A
≒
33A
≒
3.3ACurrent(CC)
Short Circuit
CC soft-startup Time 1mS; 2 mS; 5mS; 10mS; 20 mS; 50 mS; 100 mS; 200 mS Accuracy: + 15% offset+10% FS
Dynamic Measurement Transition List: 0-25kHZ; 2.5A/uS; T1&T2:60uS-999S; Accuracy: + 15% offset+10% FS
Battery Measruement Battery Input: 0.5-120V; Max. Measurement: Capacity=999/H; Resolution=0.1mA; Time Range=1S-16HS
0.1%+0.1%FS0.1%+0.1%FS0.1%+0.1%FS0.1%+0.1%FS0.1%+0.1%FS0.1%+0.1%FS0.1%+0.1%FS0.1%+0.1%FSAccuracy
10mW1mW10mW1mW10mW1mW10mW1mWResolution
300W100W300W100W300W100W150W100WWattW Measurement
(Voltage and
current input
value ≥10% full
measument )
0.03%+0.08%FS0.03%+0.05%FS0.03%+0.08%FS0.03%+0.05%FS0.03%+0.08%FS0.03%+0.05%FS0.03%+0.08%FS0.03%+0.05%FSAccuracy
1mA0.1mA0.1mA0.01mA0.1mA0.01mA0.1mA0.01mAResolution
0-60A0-6A0-15A0-3A0-30A0-3A0-30A0-3ACurrent
I Measurement
0.015%+0.03%FS0.015%+0.03%FS0.015%+0.05%FS0.015%+0.03%FS0.015%+0.03%FS0.015%+0.02%FS0.015%+0.03%FS0.015%+0.03%FSAccuracy
10mV1mV10mV1mV10mV1mV10mV1mVResolution
0-150V0-19.999V0-500V0-19.999V0-150V0-19.999V0-150V0-19.999VVoltage
V Measurement
0.1%+0.1%FS0.1%+0.1%FS0.1%+0.1%FS0.1%+0.1%FS0.1%+0.1%FS0.1%+0.1%FS0.1%+0.1%FS0.1%+0.1%FSAccuracy
10mW1mW10mW1mW10mW1mW10mW1mWResolution
0-300W0-300W0-300W0-300W0-300W0-300W0-150W0-150WRangeCW Mode
(Voltage and
current input
value ≥10% full
measument )
0.1%+0.1%FS0.1%+0.1%FS0.1%+0.1%FS0.1%+0.1%FS0.1%+0.1%FS0.1%+0.1%FS0.1%+0.1%FS0.1%+0.1%FSAccuracy
16bit16bit16bit16bit16bit16bit16bit16bitResolution
0.03Ω-5K0.03Ω-10K0.3Ω-5K0.3Ω-10K0.03Ω-5K0.03Ω-10K0.03Ω-5K0.03Ω-10KRangeCR Mode
(Voltage and
current input
value ≥10% full
measument )
0.03%+0.02%FS0.03%+0.02%FS0.03%+0.02%FS0.03%+0.02%FS0.03%+0.02%FS0.03%+0.02%FS0.03%+0.02%FS0.03%+0.02%FSAccuracy
10mV1mV10mV1mV10mV1mV10mV1mVResolution
0.1-150V0.1-19.999V0.1-500V0.1-19.999V0.1-150V0.1-19.999V0.1-150V0.1-19.999VRange
CV Mode
0.03%+0.05%FS0.03%+0.05%FS0.03%+0.05%FS0.03%+0.05%FS0.03%+0.05%FS0.03%+0.05%FS0.03%+0.05%FS0.03%+0.05%FSAccuracy
1mA0.1mA1mA0.1mA1mA0.1mA1mA0.1mAResolution
0-60A0-6A0-15A0-3A0-30A0-3A0-30A0-3ARange
CC Mode
0-150V0-500V0-150V0-150VVoltage
0-60A0-15A0-30A0-30ACurrent
300W300W300W150WPower
Input Raitng
M9712CM9712BM9712M9711Model
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Model M9712B30
Power 300W
Current 0-30A
Input Rating
Voltage 0-500V
Range 0-3A 0-30A
Resolution 0.1mA 1mA
CC Mode
Accuracy 0.05%+0.05%FS 0.05%+0.08%FS
Range 0.1-19.999V 0.1-500V
Resolution 1mV 10mV
CV Mode
Accuracy 0.03%+0.02%FS 0.03%+0.05%FS
Range 0.3Ω-10K 0.3Ω-5K
Resolution 16 bit 16 bit
CR Mode
(Voltage and current input
value ≥10% full measument)
Accuracy 0.1%+0.1%FS 0.1%+0.1%FS
Range 0-300W 0-300W
Resolution 1mW 10mW
CW Mode
(Voltage and current input
value ≥10% full measument)
Accuracy 0.1%+0.1%FS 0.1%+0.1%FS
Voltage 0-19.999V 0-500V
Resolution 1mV 10mV
V Measurement
Accuracy 0.015%+0.03%FS 0.015%+0.05FS
Current 0-3A 0-30A
Resolution 0.01mA 0.1mA
I Measurement
Accuracy 0.05%+0.08%FS 0.08%+0.08%FS
Watt 100W 300W
Resolution 1mW 10mW
W Measurement
(Voltage and current input
value ≥10% full measument)
Accuracy 0.1%+0.1%FS 0.1%+0.1%FS
Battery Measurement Battery Input: 0.5-
120V; Max. Measurement: Capacity=999/H; Resolution=0.1mA;
Time Range=1S-16HS
Dynamic Measurement Transition List: 0-25kHZ; 2.5A/uS; T1&T2:60uS-999S; Accuracy: + 15%
offset+10% FS
CC soft-startup Time 1 mS; 2 mS; 5mS; 10mS; 20 mS; 50 mS; 100 mS; 200 mS Accuracy: + 15%
offset+10% FS
Current(CC) 3.3A≒ 33A≒
Voltage(CV) 0V
Short Circuit
Resistance(CR) 280mΩ≒
Operating 0～40℃
Temperature
Nonoperating –10℃～70℃
Dimension
W*H*D(mm) 108*214*365
Weight
Kg 3.5
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2.2 DC Electronic Load Dimensional Line Drawings
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Chapter 3 Quick Reference
3.1 Power-onself-test
Verify that you have received the following items with yourXT 98XX DC Programmable Electronic
Load.. If anything is missing, contact your nearest XiTRON authorized Sales Representative's Office.
□ One power cord for your location/country
□ The M97xx User’s Manual
□ One CD (if you have purchased the optional communication accessories)
□ One communication cable (if you have purchased the optional communication accessories)
First, make sure the DC electronic load has been correctly connected and powered on. Please refer to the
following table for the detailed operational steps.
Procedure Display Explanation
1. Power-up the DC
electronic load
SYSTEM SELF TEST
Vxxx
The electronic load powers up and the VFD
panel displays the firmware revision level
#.
EPROM ERROR
EEPROM damage or lost data at last power
off session.
2. Wait for 1s after
turning the DC
electronic load on
ERROR CAL.DATA
EEPROM lost calibration data.
3. Wait another 2S
after ERROR has
occurred
xxxxxxxV xxxxxxxA
xxxxxxxW xxxxxxxX
Displays the actual input voltage an
d current
values and theactual power and reactant
setting values.
3.2 In the Event of a Problem
If the DC electronic load fails to power up, the following troubleshooting steps will help to determine the
problem.
1) Make sure the power cord is connected properly and the Power switch has been pushed in to ON..
2) Check the power voltage setting on the back panel.
There are two voltages that power the DC load: either 110V or 220V. Please make sure the right voltage
setting has been selected manually foryour area.
3) Check the DC load's fuse..
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If fuse is open, please replace it with another fuse that meets the following specifications.
Model Fuse specification
(110VAC)
Fuse specification
(220VAC)
M9711 T0.5A 250V T0.3A 250V
M9712 T0.5A 250V T0.3A 250V
M9712B T0.5A 250V T0.3A 250V
M9712C T0.5A 250V T0.3A 250V
M9712B30 T0.5A 250V T0.3A 250V
4)．Replace the Fuse
Open the plastic cover on the rear panel of the DC electronic load with a flat screwdriver. (See table
3.1) and find the open fuse. Then replace the open fuse with a new one.
Diagram 3.1 Fuse Location
3.3 Front Panel Operation and Back Panel Operation
Please refer to Diagram 3.2 for the front panel of M97XX DC electronic load.
Fuse location
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Diagram 3.2 Front panel
① The upper half is the black Vacuum Fluorescent Display (VFD) display screen.
② Robtary knob, Turn to adjust the setting values.
③ Numeric keys 0-9, ESC key, secondary key functions
④ Keypad: set up the current,voltage,power,resistance modes(I-set, V-set, P-set, R-set, Shift and
On-Off);Scroll through menus and options
⑤ Input terminals
⑥ Power switch to turn on/off the instrument
⑦ Up-Down keys, Enter key
Diagram 3.3 the back panel of the M97XX Series DC electronic load
BNC Out connector for 0-full range current, that corresponds to 0-10V output.An Oscilloscope
can be connected here to view dynamic waveforms.
Remote Measurement terminals and trigger for input/output interface
DB Sub 9 pin multifunctional communications interface for RS232, RS485 and USB serial buses
(with optional M133 D sub 9 to USB conversion cable). Do not connect an M131 cable with
standard RS-232 voltages on the cables connectors. Doing so may damage the instrument
and is not covered by WARRANTY.
3.4 Keypad Directions
1
～
9
0-9 numeric keys
Esc
Esc key (enables exit from any working condition/mode)
I-Set
Switch to CC mode
22
33
11
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Setting up a constant current
V-Set
Switch to CV mode
Setting up a constant voltage
P-Set
Switch to CW mode
Setting up a constant power
R-Set
Switch to CR mode
Setting up a constant resistance
Shift
Multi-purpose
Used in conjunction with other keys to perform diverse functions and
applications(for example: shift+0/Menu key will launch the menu
function)
On/Off
Turn DC electronic Load on/off
Scroll up menu choices
Scroll down menu choices
Enter
Confirmation of settings key
3.5 Menu Operation
Press the Shift+0/Menu keys in sequence to access the menu functions and theVFD screen
displays the menu choices: CONFIG, SYSTEM SET, LIST,AUTO TEST, SHORTCUT AND EXIT. . Select
the menu items by pressing the ▲ and ▼ cursor keys and then press the Enter key to open the menu
item you chose. Or press the Esc key to return to theout of the menu function.
MENU
CONFIG
INPUT RECALL
Resets the output to the same state as the last time
used when the load is turned off; or to the OFF state
when the DC electronic load is powered back on
ON
Retains the same settings when the DC
electronic load is turned off
OFF
Sets the output to the OFF state when the DC
electronic load is powered on. The load will work
on CC mode
KEY PAD SOUND
SET-UP
Sets the keypad sounds
ON
Will activate abeep when any key is pressed.
OFF
Deactivates the beep when any key is pressed
CONNECT MODE
Connect mode
MAXTIDLEXING?
Multi
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SEPARATE
Single
BAUD RATE SET
Setting the modem Baud rate
2400 baud
9600 baud
14400 baud
28800 baud
57600 baud
115200 baud
COMM.PARITY
Setting Communications Parity mode
NONE
No Parity
EVEN
Even Parity
ODD
Odd Parity
ADDRESS SET
Setting an Address
1~200
The address is the input number (1-200).
KEY LOCK SET
Setting the password to unlock the keypad (when 0 or
null is set, there is no password set)
EXIT
SYSTEM SET
MAX CURRENT SET
Setting the maximum Current.
If the maximum current set is higher than 3A, the load
is in high range. Otherwise, it is in low range.
MAX VOLTAGE SET
Setting the maximum Voltage.
If the maximum voltage set is higher than 20V, the
load is in high range. Otherwise, it is in low range.
MAX POWER SET
Setting the Maximum Power.
TERMINAL SET
Selecting the input terminal
FRONT
Select the input terminal on the front panel
BACK
Select the input terminal on the back panel
EXIT
LIST
LOAD LIST
Choose list files, 1~8
EDIT LIST
Edit list files
MINIMUM TIME
Edit minimum time(0.02~1310.7mS)
LIST MODE
List output mode
CONTINUOUS
Continuous mode
END HOLD
Retains the last output voltage level after
the entire sequence is successfully
completed
END RESET
Retains the load OFF state after the
entire sequence is successfully
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completed
STEP LENGTH
Step length(1~200)
STEP n 1~whole step length
CURRENT
Set current
TIME
Duration
EXIT
AUTO TEST
LOAD AUTO TEST
Select automatic test files 1~8
EDIT AUTO TEST
Edit automatic test files
STEP LENGTH
Set the entire step length
STEP n
WORK MODE
LOAD OFF MODE
Load OFF mode
CC MODE
Constant Current mode
CV MODE
Constant Voltage mode
CP MODE
Constant Power mode
CR MODE
Constant Resistance
mode
SHORT MODE
Short circuit mode
TEST MODE
Qualification testing mode
TEST CURRENT
Test Current
TEST VOLTAGE
Test Voltage
TEST POWER
Test Power
TEST RESI
Test Resistance
DELAY TIME
Test delay time
between(0.2~25.5S)
INPUT xxxx
Input the parameters desired, for
example: CC mode, 1A
MINIMUM xxxx
Input the minimum lower limit
MAXIMUM xxxx
Input the maximum upper limit
SET-UP AUTO TEST
TRIGGER
Trigger output selection
PASS
Trigger once when passing the
test
FAIL
Trigger once when failing the test
TEST END
Trigger output is initiated when
test ends
DISABLE
Disable trigger output
OUTPUT
Output electrical characteristics selection
PULSE
Pulse output
LEVEL
Voltage level output
EXIT
EXIT
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Chapter 4 Panel Operation
4.1 Basic Operation Mode
There are four operation modes for the DC electronic load:
1. Constant Current (CC)
2. Constant Voltage (CV)
3. Constant Resistance (CR)
4. Constant Power (CW)
4.1.1 Constant Current Operation Mode (CC)
In this mode, the DC electronic load will synchronize with a current in accordance with the
programmed value regardless of the input voltage. Please refer to Diagram 4.1. If the maximum current
value of the power supply under test is lower than the constant current value set, the electronic load might
fail to automatically adjust to these levels. Accordingly, the constant current and voltage of the measured
power supply should be adjusted lower..
Load current
I
V
Load voltage
Current Set
Load current
I
V
Load voltage
Current Set
Diagram 4.1 Constant Current Mode
4.1.1.1 Setup a Standard Constant Current Mode
Press the I-SET key and the VFD display will show STANDARD CURR=xxxxxxxxA, the present
constant current value. Press the numeric keys and decimal point key to enter the constant current value
desired, followed by pressing the Enter key to confirm the setting. - The DC Electronic Load load will
now be inthe standard constant current mode.
If the input state is in OFF state, then the word OFF will appear in upper right corner of the VFD
display. Press the On/Off key to change the load's input state to an ON state. Now CC or Unreg will
appear in the upper rightcorner of the VFD display. . Displaying CC means the load has been successfully
set with the expected constant current value; if Unreg is displayed,the load couldn’t adjust itself to the
constant current value that was entered. Please check to determine whether or notthe power supply under
test has the proper connections and has been turned on;also check to make sure that the desired constant
current value is within the range of the power supply under test.
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If you want to fine tune the constant current value, rotate the encoder knob to adjust the value.
Rotating clockwise will increase the value and rotating it counter-clockwise will decrease the value. Note: if
the constant current value you want to set is beyond the maximum constant current value capability of the
DC load, the current value will stop increasing even if you continue to rotate the encoder knob clockwise.
At this point, the lower lower rightcorner of the VFD panel will display the constant current value you set.
Within this number sequence, if the cursor underlines one particular digit, that digit requires adjustment. If
users want to make adjustments to finetune the accuracy, depress the rotary encoder knob. Every time
the rotary encoder is pressedthe cursor will move forward to the previous digit.
4.1.1.2 Loading and Unloading Constant Current Mode
Loading and unloading CC mode can protect the power supply under test from damage. When the
voltage of the power supply under test starts to increase, the load will automatically adjust itself to the
open-circuit state, The load then carries the power supply being tested and adjusts itself to the current
value of the UUT set when the voltage of the UUT increased to the ONSET loading voltage level. When the
voltage of the power supply under test begins to decrease to the OFFSET unloading value, the load will
again automatically adjust itself to the open-circuit state. If the ONSET loading voltage value is higher than
the OFFSET unloading voltage, the load can avoid frequent carrying and unloading at the critical point of
unloading voltage; so the power supply under test willbe well protected.
Diagram 4.2 Loading and Unloading Mode
When in standard constant current mode, pressing the Shift+1(V_Level) keys in sequenceputs the
DC Electronic Load into the loading and unloading CC mode. When the VFD display shows ONSET
VOLT=xxxxxxxxV indicating the current loading voltage, use the numeric keys and decimal point key to
enter the loading voltage value desired, then press theEnter key to confirm the setting. Now the VFD panel
will display OFFSET VOLT=xxxxxxxxV indicating the current unloading voltage level. Press the numeric
keys and decimal point key to enter the unloading voltage value desired, followed by pressing the Enter
key to confirm the setting. Accordingly, the DC Electronic Load will enter into the loading and unloading
constant current mode between the two preset limits automatically
If the input state is OFF , then the upper right corner of the VFD panel will show the word OFF. Press
the - On/Off key to change the input state back toON . Then the upper right right corner of the VFD display
T
U
ON SET
ON
OFFOFF
T U ON
OFFOFF
OFF SET
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