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16

4.1.2.3 Shifting from Constant Resistance to Constant Voltage Mode   

I

U

I

U

 

Diagram 4.6 Shifting from Constant Resistance to Constant Voltage Mode 

 

 

By  shifting from  constant  resistance  into  constant  voltage mode,  the  power  supply    under  test  can   

avoid    damage from a current strike..     

From  the  standard  constant  current  mode,  press  the 

Shift+5(CR+CV) 

keys  to  enter  the  constant 

current shifting to constant voltage mode. When the VFD display shows 

CR TO CV VOLT=xxxxxxxxV

 it 

indicates the current constant voltage value that is set. Press the numeric keys and decimal point key to 

enter the constant voltage value desired,and press the 

Enter

 key to confirm the setting. In this mode, the 

load will shift    from the constant resistance to the constant voltage set. 

If the input state is   

OFF

 , then the upper right corner of the VFD display will show 

OFF

. Press the   

On/Off

 key to change the input state to

 ON

. Then the upper right corner of the VFD display will show either 

CR+CV 

or 

Unreg

. 

CR+CV

 means the load has been successfully set with the selected constant resistance 

value; 

Unreg

 means the DC Load could not accept the input constant resistance value. Please check that 

the power supply under test has been correctly connected and turned on; make sure    voltage is normal. 

Pressing  the  Shift+5(CR+CV)  keys  in  sequence  while  in  the  loading  and  unloading  constant 

resistance mode,    will place the DC Load back into the standard constant resistance mode.   

4.1.3 Constant Voltage Operation Mode (CV) 

     

  In this mode, the DC Electronic Load will attempt to generate sufficient current and synchronize to the 

source voltage of the unit under test with    the programmed value. Please refer to the Diagram at 4.7. Note: 

When the voltage of the power supply under test is less than the voltage value set, or the input current is 

beyond the maximum current that the DC load can withstand, the load will be unable to synchronize to the 

voltage value set. 

 

V

I

Load input 
Voltage

Load current

Volt Set

V

I

Load input 
Voltage

Load current

Volt Set

 

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Содержание M97 series

Страница 1: ...USER S Guide Programmable DC Electronic Load Model M9711 M9712 M9712B M9712C M9712B30...

Страница 2: ...ii...

Страница 3: ...de 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...

Страница 4: ...tion 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 Testin...

Страница 5: ...lications 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 V...

Страница 6: ...1mA 0 1mA 1mA 0 1mA Resolution 0 60A 0 6A 0 15A 0 3A 0 30A 0 3A 0 30A 0 3A Range CC Mode 0 150V 0 500V 0 150V 0 150V Voltage 0 60A 0 15A 0 30A 0 30A Current 300W 300W 300W 150W Power Input Raitng M97...

Страница 7: ...ion 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 Measurem...

Страница 8: ...4 2 2 DC Electronic Load Dimensional Line Drawings...

Страница 9: ...x 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 lo...

Страница 10: ...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 f...

Страница 11: ...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...

Страница 12: ...s 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 Es...

Страница 13: ...n 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...

Страница 14: ...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 p...

Страница 15: ...nstant 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 curr...

Страница 16: ...e 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...

Страница 17: ...the soft start CCmode When the VFD display shows Rising TM xxxxxxxxvmS indicating the current rise time usethe numeric keys and decimal point key to enter the current rise time desired Follow by pres...

Страница 18: ...en successfully set into the desired CC value by displaying Unreg means the load could not adjust itself to the selected CC value Check that the unit under test has been connected correctly and powere...

Страница 19: ...sers want to adjustorfine tune the accuracy simply push in on the rotary encoder knob Each click the encoder is rotated movesthe cursor left or right on the VFD screen 4 1 2 2 Loading and Unloading Co...

Страница 20: ...upper right corner of the VFD display will show either CR CV or Unreg CR CV means the load has been successfully set with the selected constant resistance value Unreg means the DC Load could not acce...

Страница 21: ...the VFD display shows the constant voltage value that has been set Should a blinking cursor show up under one of the digits it will require additional tweaking If users wish to adjust the accuracy pu...

Страница 22: ...he DC Load will be in the softstart constant voltage mode If the input state is OFF then the upper right corner of the VFD display will sayOFF Press the On Off key to change the input state to ON Now...

Страница 23: ...maximum output current is within the specified range of the DC Load or at an undercurrent threshold In order to fine tune the constant power value rotate the encoder knob to adjust the value desired...

Страница 24: ...operation enables the DC electronic load to periodically switch between two pre set load levels This function can be used to test the transient characteristics of the LED driver being tested Dynamic t...

Страница 25: ...RISING TM xxxxxxxxmS it indicates the current rise time set from value A to value B Use the numeric and decimal point keys to enter the rise time desired and press the Enter key to confirm Next the D...

Страница 26: ...e triangular wave might function as a square wave there are 0 100 different accuracy steps scaled according to the different rising and falling times set 4 2 5 3 Trapezoidal Wave When set in the Conti...

Страница 27: ...first step and press Enter to confirm When the display shows STEP 1 TM xxxxx mS it indicates the current duration of the first step Press the numeric keys to input the current duration desiredin the f...

Страница 28: ...ess Enter Note step lengths should be a round number between1 50 3 At STEP 1 xxxxx MODE use the and keys to select from the following six working modes then press Enter Working Mode Promp Messages Exp...

Страница 29: ...ys to get to MENU AUTO TEST and press Enter Scroll the and keys to get to SETUP AUTO TEST and press Enter The DC electronic load will be in automatic test trigger output mode There are 4 types of trig...

Страница 30: ...d on with full scale current The short circuit function can be toggled on off at the front panel by pressing the Shift 9 Short keys Short circuit operation does not influence the current value set Whe...

Страница 31: ...M9712 DC electronic load is 150V When any value beyond 150V is input the load will default back to 150V Besides the maximum voltage value input is closely related tovoltage resolution If the maximum...

Страница 32: ...put wattage of the M9712 DC electronic load is 300W When any value beyond 300W is input the load will default back to 300W 4 5 4 Input Polarity Reversed If the DC electronic load has its input polarit...

Страница 33: ...e load is near to zero point and does not change in conjunction with the signal please check that the wire mode matches the parameters of the remote measurement function Please refer to the picture 4...

Страница 34: ...battery being on the threshold value set or at the margin of an insecure state and will stop testing automatically When the load is in test mode you can see the battery s voltage battery discharge cur...

Страница 35: ...3 5 9600 0 004s M97 series programmable DC electronic loads are equipped with two way asynchronous communication with 1 bit fixed as the start bit 8 data bits and 1 stop bit It supports Non parity ch...

Страница 36: ...otocol all the hexidecimal data and the floating point number are fixed in the High Byte and the unfixed data length fields are in the Low Byte In addition the output value of a force single coil must...

Страница 37: ...01 04 CRC Error Check 2 Example The following example reads the load input state ISTATE of the Coil of the slave device as address 0x01 From table 4 8 7 1 below we know that the ISTATE address is 0x0...

Страница 38: ...Query 0x01 0x05 0x05 0x00 0xFF 0x00 0x8C 0xF6 The Correponding Response 0x01 0x05 0x05 0x00 0xFF 0x00 0x8C 0xF6 3 Read Holding Registers 0x03 Read Holding Registers Example Query Field Name Byte leng...

Страница 39: ...ers 2 N CRC Error Check 2 Preset Multiple Registers Example in an Illogical Response Field Name Byte length Example Value Slave Address 1 1 200 Function Code 1 0x90 Abnormal Code 1 01 04 CRC Error Che...

Страница 40: ...escription CMD 0x0A00 1 W R Command Register lower 8 bits logical high 8 bits illogical IFIX 0x0A01 2 W R Constant current register double type UFIX 0x0A03 2 W R Constant voltage register double type...

Страница 41: ...W R LIST serial number register u16 type SERATEST 0x0A33 1 W R Automatic Test serial number register u16 type IMAX 0x0A34 2 W R Current maximum register double type UMAX 0x0A36 2 W R Voltage maximum r...

Страница 42: ...ol Operation Operation Register Value Description Force Single Coil PC1 1 mandatory Table 2 Cancelling remote control operation Operation Register Value Description Force Single Coil PC1 0 mandatory T...

Страница 43: ...IX Double Optional Preset Multi Registers CMD 2 mandatory Table 10 CW mode operation Operation Register Value Description Preset Multi Registers PFIX Double Optional Preset Multi Registers CMD 3 manda...

Страница 44: ...mandatory Table 15 CV loading and unloading mode Operation Register Value Description Preset Multi Registers UFIX Double Optional Preset Multi Registers UCVONSET Double Optional Preset Multi Registers...

Страница 45: ...ister Value Description Preset Multi Registers RFIX Double Optional Preset Multi Registers UCRCV Double Optional Preset Multi Registers CMD 35 Must select Table 20 Battery test mode Operation Register...

Страница 46: ...X Double Optional Force Single Coil REMOTE 0xFF00 0x0000 Optional Preset Multi Registers CMD 41 mandatory 4 9 Remote operation 4 9 1 M 131 or M 133 Communication Cable The DB9 interface connector on t...

Страница 47: ...te operation mode please insure that the baudrate and communication port address of the DC electronic load are the same as that in the PC s softwareor the communication will fail You can change the ba...

Страница 48: ...voltage level so the pin outs of the voltage level shift cable M 131 or M 133 must be set up to match the PC before connecting the DB9 interface with the serial interface on PC M 131 Voltage Level Shi...

Страница 49: ...stry standard RS 232 interface cable between the M97XX and a regular PC will not facilitate communication between the devices The dongle on the M 133 provides the necessary switiching to enable proper...

Страница 50: ...always beware of electric shock hazard Don t use the equipment without regard for personal safety Certification and Warranty M97 Series Electrical Loads are warranted to meet its published technical s...

Страница 51: ...47 Disclaimer Manufacturer reserves the right to make specification s changes to product s and its accompanying documentation at any time and without previous notification to it s customers...

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