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Frequency Range

0.38Hz~50kHz

High/Low Time
Resolution
Accuracy

0~655.35ms

10us

0.2%+10us

0~655.35ms

10us

0.2%+10us

Rising/Falling Time
Resolution
Accuracy

10us~655.35ms

10us

0.2%+10us

10us~655.35ms

10us

0.2%+10us

List Characteristics

Step Time
Resolution
Accuracy

10us~100000s

10us

0.2%+10us

10us~100000s

10us

0.2%+10us

Number of Steps

1~50

Cycle

1~65535

Store Capacity

7 lists

Expanded Functions

Chain

Battery Discharge

Discharge Time

Resolution
Accuracy

1s~100h

0.2%+1s

1s~100h

0.2%+1s

Battery Capacity
Resolution
Accuracy

1mAh~2000Ah

1mAh

0.3%+0.01Ah

1mAh~3000Ah

1mAh

0.3%+0.01Ah

Short Circuit

CCL Mode
CCH Mode
CV Mode
CRL Mode
CRM Mode
CRH Mode
CPV Mode

CPC Mode

2.2A

22A

0.06Ω

6Ω

60Ω
220W

3.3A

33A

0.06Ω

6Ω

60Ω
370W

Maximum Slew Rate

Current
Voltage

2A/us

0.6V/us

3A/us

0.6V/us

Programmable Open Circuit

≥

20k

≥

20k

Trigger Input

Trigger Level

Trigger Pulse Width

TTL falling edge

≥

10us

TTL falling edge

≥

10us

Summary of Contents for 3720A

Page 1: ...12 2 3 1 4 Transient Current Level 12 2 3 1 5 Software Current Limit 12 2 3 2 Constant Voltage Mode CV 12 2 3 2 1 Setting Ranges 13 2 3 2 2 Immediate Voltage Level 13 2 3 2 3 Triggered Voltage Level...

Page 2: ...Functions 30 2 15 1Trigger Function Selection 30 2 15 2 Knob Function 31 2 15 3 Key Sound 31 Chapter3 Installation 31 3 1 Initial Check 31 3 2 Environment Installation Location 31 3 3 Power On Self T...

Page 3: ...t Rise Fall Rate in CC Mode 61 4 14 6 Trigger Function Selection 62 4 14 7 Knob Function 62 4 14 8 Key Sound 62 4 14 9 Communication Interface 63 Chapter5 Remote Programming Operation 64 5 1 Communica...

Page 4: ...even though the input voltage is 0V This is especially suitable for fuel cell solar cell and other new energy test applications Perfect protection assures high reliability in the most complicated tes...

Page 5: ...ote sense terminal Input binding posts Knob Entry keys secondary function keys Annuciators Switch key for secondary function Left Right key Up Down key Display switching key 1 3 Rear Panel Fig1 2 Rear...

Page 6: ...n blue To use the secondary function please press key first then press the relevant key List 1 1 Description for Keys 0 Local key 1 Save key 2 Recall key 3 Error code display key 4 List start key 5 Li...

Page 7: ...Parameter Description Load Default Yes No Restore default Yes No Short On Off Short circuit mode On Off Von Latch On Off Von latch On Off Von Point 0 000v Set Von voltage point Von point CV Curr Limit...

Page 8: ...aved parameters in location 0 will be recalled automatically 1 6 2 Mode Selection and Parameter Setting Menu Press key to enter into mode selection and parameter setting menu which is shown as below F...

Page 9: ...nt Note Transient operation may be used in CC CV and CR modes 1 6 4 List Operation Menu Press key key to enter into the list operation menu which is shown as below Function Description No Select seque...

Page 10: ...V Mode The first line shows measured voltage and current levels The second line shows voltage set level CV mode and input status of the load ON OFF CR Mode The first line shows measured voltage and cu...

Page 11: ...icate medium resistance mode transient operaion and tCRH indicates high resistance mode transient operaion t indicates transient operation and input status of the load ON OFF List Operation The first...

Page 12: ...l Power Pressing and key can switch the display of load status and actual power On the display screen of actual power the first line shows actual voltage and current the second line shows set level an...

Page 13: ...except key key All operations on electronic load are controlled by remote controller The electronic load will return to local control and REM remote control annunciator is turned off after receiving t...

Page 14: ...regardless of the change of input voltage see Fig 2 1 Press key in basic mode to enter into mode selection and parameter setting menu Choose CCH or CCL mode with and keys Input the current level via t...

Page 15: ...Y 372x Series Electronic Load SCPI Programming Guide 2 3 1 4 Transient Current Level The load will switch between the transient high current level LevelH and transient low current level LevelL when th...

Page 16: ...ltage level only can be set via remote command VOLTage TRIGgered NRf Once a voltage level is triggered subsequent triggers will become invalid until another VOLTage TRIGgered NRf command is received T...

Page 17: ...ched from CRL to CRH the input will be turned off around 5ms Besides it is noted that the resistance set level may change with the resistance range to fit the new range Take 3721A for example the pres...

Page 18: ...ource mode CPC The CPV mode is applied to voltage source test and the CPC mode is applied to current source test In CP mode the load consumes the constant power in accordance with the programmed value...

Page 19: ...CP mode which can be set via mode selection and parameter setting menu or via remote command POWer NRf The immediate resistance level can also be modified directly with left right keys and the knob 2...

Page 20: ...he load to the operating mode that needs transient test Note In transient test the Von point and current limit should be taken into consideration which may cause the shut down of the input thus interr...

Page 21: ...it in cycles Fig 2 6 Continuous Transient Operation 2 4 2 Pulsed Transient Operation The trigger function is required for pulsed transient operation When there is no trigger occurs the load remains at...

Page 22: ...he external trigger input TRAN ON Enables transient operation CURR LOW 5 Sets transient current low level to 5A CURR HIGH 10 Sets transient current high level to 10A TRAN HTIM 500us Sets transient hig...

Page 23: ...age HIGH NRf RESistance LOW NRf RESistance HIGH NRf TRANsient RTIMe NRf TRANsient FTIMe NRf TRANsient MODE TOGGle TRANsient ON OFF The trigger can be an external trigger signal received via the TRIG i...

Page 24: ...ration can be executed in the CC CV and CR modes The minimum duration for each step is 10us and the maximum one is 99999 99999s around 27 78 hours The list operation allows to be executed cyclically a...

Page 25: ...current discharge to test battery capacity The discharge current and cut off voltage can be self defined When the battery voltage decreases to the cut off voltage the battery discharge test will stop...

Page 26: ...value for each model is shown as follows Model 3720A 3721A 3722A 3723A 3724A Mode CCL 3 3A 4 4A 2 2A 3 3A 2 2A CCH 33A 44A 22A 33A 22A CV 0V 0V 0V 0V 0V CRL 0 018 0 018 0 06 0 06 0 12 CRM 1 8 1 8 6 6...

Page 27: ...the trigger source is GPIB GET signal or TRG command The EXTernal mode Choose the External trigger input terminal or key key on the front panel as the trigger source The input signal at the External...

Page 28: ...Von point Please see figure 2 11 if the Von Latch function is disabled once the input voltage reaches Von Point the input will be turned on automatically and once the input voltage is less than the V...

Page 29: ...used to set the current rise rate in CC mode It can be set in main menu or via the remote command CURRent RISE RATE NRf If the current rise rate is 0 1A us and the current set level is 20A then the c...

Page 30: ...s provided with an EEPROM memory which can save various parameters such as modes input status current voltage resistance transient settings limits etc 372x Series electronic load can save 10 groups of...

Page 31: ...ger function selection Tran Trigger source Trigger source external Battery Mode Battery discharge operation off Battery mini voltage Battery minimum termination voltage 0V Battery discharge current Ba...

Page 32: ...rent OC Overpower OP Overtemperature OT Reverse Voltage RV Once any of the above protection function is active the corresponding status bit in the status will be set the input will be turned off with...

Page 33: ...e the input power exceeds the maximum rated power the hardware power limit circuit will be enabled immediately to limit the input power within the allowed range in the meantime the load will compute t...

Page 34: ...derated power from 40 C to 50 C or the overtemperature protection will be caused Place the load in a location with good ventilation and keep a distance from electromagnetic interference Do not place...

Page 35: ...nel of 372x Series electronic load is shown as fig 3 1 which mainly includes AC input part and communication interface part The AC input part includes AC input socket Fuse holder and Line voltage swit...

Page 36: ...meanwhile only one type interface can be used by the load to communicate with external devices 3 5 Connections on the Front Panel The terminals of 372x Series electronic load on the front panel inclu...

Page 37: ...ions As the influence of connected power and the conductor resistance of the load the voltage at the input terminals will be lower than output voltage when the current flows across the load When great...

Page 38: ...n Under remote control status all operations on electronic load are controlled by remote controller The electronic load will return to local control after receiving the return command SYST LOCal Or yo...

Page 39: ...s entered at present or exit mode selection and parameter setting menu 4 Press key to confirm and exit mode selection and parameter setting menu 5 Press key to turn on the load s input 4 5 1 CC Mode C...

Page 40: ...Press key to turn on the load 0 000V 0 000A 5 800A CCH ON Solution 2 Procedures Operation Descriptions Display 1 Move the cursor to the hundredths with key 0 000V 0 000A 5 120A CCH OFF 2 Rotate the k...

Page 41: ...the knob together with keys to input the voltage value to 50 MODE CV VOLT 50 000V 4 Press key to confirm and exit the mode selection and parameter setting menu 0 000V 0 000A 50 000V CV OFF 5 Press ke...

Page 42: ...be MODE CV Sets the mode VOLT 60 Sets the voltage value INP ON Turns on the load Note CV will be shown in the lower right corner of the display when the load is in CV mode 4 5 3 CR Mode CR Mode inclu...

Page 43: ...resistance value to 1 8 MODE CRL RES 1 8000 3 Press key to confirm and exit the mode selection and parameter setting menu 0 000V 0 000A 1 8000 CRL OFF 4 Press key to turn on the load 0 000V 0 000A 1...

Page 44: ...to confirm and exit the mode selection and parameter setting menu 0 000V 0 000A 100 00W CPV OFF 5 Press key to turn on the load 0 000V 0 000A 100 00W CPV ON 6 Check the present power value with 0 000V...

Page 45: ...ht corner of the display when the load is in CPV or CPC mode 4 6 Short Circuit Operation The operating procedures for short circuit operation are shown below 1 Press key to enter into main menu and se...

Page 46: ...ircuit operation MODE CCH Sets the mode INP ON Turns on the load Example 2 Based on the last example exit the short circuit operation and turn off the load Procedures Operation Descriptions Display 1...

Page 47: ...ressing key key or the signal at the trigger input terminal TRIG IN is low level 4 7 1 Continuous Transient Operation Example 1 Take 3721A as an example set the load voltage value to periodically swit...

Page 48: ...r use the knob together with keys to set TimeR to 10ms and press key to confirm TimeR 10 00ms TimeF 100 00ms 9 Use Entry keys or use the knob together with keys to set TimeF to 20ms and press key to c...

Page 49: ...ey to confirm and exit the mode selection and parameter setting menu 0 000V 0 000A 0 000A CCH OFF 2 Press key to enter into transient operation The display shows t to indicate in CCH status 0 000V 0 0...

Page 50: ...RTIME 10us Sets a value to time for rising edge TRAN FTIME 10us Sets a value to time for falling edge TRAN MODE PULS Selects pulsed transient operation INP ON Turns on the load INIT Initialize the tri...

Page 51: ...Mode value to Togg and press key to confirm Mode Togg 9 Press key to exit the transient operation menu 0 000V 0 0000A 200 00 tCRH OFF 10 Press key to turn on the load 0 000V 0 0000A 200 00 tCRH ON 11...

Page 52: ...list operation menu 7 Select Edit then press to enter step edit screen 8 Use to select parameters 9 Use Entry keys or use the knob together with keys to input set value or use the knob key to select...

Page 53: ...ss key to exit sequence operation menu 18 Press key key to activate sequence operation 19 Press key key to stop sequence operation After sequence editing the operating procedures for enabling and disa...

Page 54: ...press key to confirm Clear Data Yes No 10 Use key or knob to select Yes and press key to confirm The data is cleared and step edit screen appears 01 0 00000s CCH 0 000A 11 Edit the step1 CCL 1A 1S Th...

Page 55: ...000V 0 0000A 1 000A LCCL ON 20 Press key key to stop sequence operation 0 000V 0 000A 0 000A CCH OFF For the above operating procedures the corresponding SCPI commands should be LIST NUMB 0 Recalls t...

Page 56: ...corner of the display flashes Use the knob or key to select operating mode to CCH and press key to confirm 06 1 00000s CCH 0 000A Step9 The set value in the lower right corner of the display flashes...

Page 57: ...s list LIST ON Enables list operation LIST OFF Disables list operation 4 8 3 Starting Stopping the List Example 1 Start the No 0 sequence and stop the active sequence operation Steps Operation Descrip...

Page 58: ...off the load and stop battery discharge operation 7 Press key to clear the discharged time and discharged capacity of the battery 8 Press key key to exit the battery discharge operation Example 1 Ent...

Page 59: ...d BATT ON Activates the battery discharge operation screen BATT TERM VOLT 15V Sets termination voltage to 15V BATT CURR 3A Sets discharge current to 3A INP ON Turns on the load and start battery disch...

Page 60: ...erations are shown below Procedures Operation Descriptions Display 1 Set the mode to CV set the voltage value to 40V turn off the load please refer to 4 5 2 section for detailed operations 0 000V 0 00...

Page 61: ...ands should be SYST ERR Queries the error code and error messages 4 13 Triggered Operation When the triggering mode is EXTernal the triggered operations are shown below 1 Set pending trigger function...

Page 62: ...fault values The detailed operations are shown below Procedures Operation Descriptions Display 1 Press key to enter into the main menu Load Default Yes No 2 Use the knob or key to select the parameter...

Page 63: ...key to select the menu item Von Latch use the knob or key to select the parameter Off Press key to confirm Von Latch On Off 3 Use key to select the menu item Von Point use Entry keys or the knob toge...

Page 64: ...to CCH mode set the current value to 2A set the current rise rate Curr Rise Rate in CC mode to 0 002A us set the current fall rate Curr Fall Rate in CC mode to 0 005A us turn on the load turn off the...

Page 65: ...nob or key to select the parameter Tran Press key to confirm Trig Function Tran List 3 Press key to exit the main menu 0 000V 0 000A 0 000A CCH OFF For the above operating procedures the corresponding...

Page 66: ...nu item Baud Rate use the knob or keys to select the parameter 9600 Press key to confirm Baud Rate 9600 19200 Step4 Use key to select the menu item Parity Check use the knob or key to select the param...

Page 67: ...come apparent as you read this chapter The intent of this chapter is to help users quickly become familiar with remote programming operations Programming examples given in this chapter use the SCPI co...

Page 68: ...ntrol e g SYSTem LOCal Or you can return the load to local control from remote control by pressing key key 5 4 Sending a Remote Command You can use the computer to set operation mode and operation par...

Page 69: ...e trigger voltage to 5V and selects the external trigger source l INP OFF Turns off the load s input 2 MODE CV Selects the CV mode 3 VOLT TRIG 5 Presets the trigger voltage to 5V 4 TRIG SOUR EXT Selec...

Page 70: ...rce and programs a pulse width of 1 millisecond 1 INP OFF Turns off the load s input 2 MODE CV Selects the CV mode 3 TRIG SOUR BUS Selects the bus as the trigger source 4 VOLT LOW 0 5 Sets the transie...

Page 71: ...1 5mA High Range Resolution Accuracy 0 30A 1mA 0 1 10mA 0 40A 1mA 0 1 10mA Constant Voltage Mode Range Resolution Accuracy 0 80V 1mV 0 1 10mV 0 80V 1mV 0 1 10mV Constant Resistance Mode Low Range Reso...

Page 72: ...esolution P 100W P 100W Accuracy 0 250W 1mW 10mW 0 1 600mW 0 400W 1mW 10mW 0 1 600mW Current Slew Rates Range CCH CCL 3 1mA us 3A us 100uA us 300mA us 1mA us 4A us 100uA us 400mA us Resolution 1mA us...

Page 73: ...01Ah Short Circuit CCL Mode CCH Mode CV Mode CRL Mode CRM Mode CRH Mode CPV Mode CPC Mode 3 3A 33A 0V 0 018 1 8 18 270W 0W 4 4A 44A 0V 0 018 1 8 18 420W 0W Maximum Slew Rate Current Voltage 3A us 0 6...

Page 74: ...del 3722A 3723A Input Ratings Current Voltage Power 1 0 20A 0 200V 200W at 40 C 0 30A 0 200V 350W at 40 C Input Characteristics Input Characteristics MinimumOperationVoltage FullScaleCurrent 1 2V 1 2V...

Page 75: ...rent Measurement Low Range Resolution Accuracy 0 2A 0 1mA 0 05 4mA 0 3A 0 1mA 0 05 4mA High Range Resolution Accuracy 0 20A 1mA 0 05 8mA 0 30A 1mA 0 05 8mA Voltage Measurement Range Resolution Accurac...

Page 76: ...35 Store Capacity 7 lists 7 lists Expanded Functions Chain Chain Battery Discharge Discharge Time Resolution Accuracy 1s 100h 1s 0 2 1s 1s 100h 1s 0 2 1s Battery Capacity Resolution Accuracy 1mAh 2000...

Page 77: ...e Relative Humidity 0 50 C 85 0 50 C 85 Remote Interface 6 RS232 GPIB USB RS232 GPIB USB Programming Language SCPI SCPI AC Input Voltage Frequency AC110V or AC220V 15 48 to 63Hz AC110V or AC220V 15 48...

Page 78: ...ution Accuracy V 50V 125 12500 1 54uS 0 3 0 5mS Constant Power Mode Range Resolution P 100W P 100W Accuracy 0 250W 1mW 10mW 0 2 600mW Current Measurement Low Range Resolution Accuracy 0 2A 0 1mA 0 05...

Page 79: ...Number of Steps 1 50 Cycle 1 65535 Storage Capacity 7 lists Expanded Functions Chain Battery Discharge Discharge Time Resolution Accuracy 1s 100h 1s 0 2 1s Battery Capacity Resolution Accuracy 1mAh 20...

Page 80: ...5 8kg 1 Maximum continuous power available is derated linearly from 100 of maximum at 40 C to 75 of maximum at 50 C 2 Conductance S 1 Resistance The siemens is the SI derived unit of conductance and t...

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