SCL Series - High Current
Features of performance
- Voltage 12 V or 40 V
- Currents up to 1,200 A
- Loading down to min 0.6 V or even to 0 V (SCL ZV) at maximum current
- User interface with 4.3" touch screen
- Basic operating modes CC, CV, CP, CR
- Combined operating modes CC+CV, CR+CC+CV, CP+CC+CV, CV+CC
- Adjustable protections for V and I
- Functions for testing energy storage devices
- Internal resistance measurement
- V/I characteristics sweeping
- List function with synchronous data acquisition
- Rectangular, PWM and modulation function
- MPP tracking
- Trigger model
- SCPI programming with measurement functions
- RS-232, USB, LAN, CAN, I/O port standard
- GPIB optional
- I/O port as standard
- Isolated I/O port optional
- Analog monitoring outputs for voltage and current
- Analog control inputs for control V/I and limit V/I
- Save settings
- Electronic protection
- Bilingual help system (DE, EN)
- 2 free calibrations (with registration)
DescriptionElectronic loads of the SCL series already load the connected source from 600 mV with maximum load current of up to 1,200 A, the SCL ZV variant even from 0 V. They are therefore ideal for test objects such as fuel cells and other high-current voltage sources. In the compact 19" housing with only 2 U, there are models with different power classes.
Basic Operating ModesThe devices have constant current (CC), constant voltage (CV), constant resistance (CR) and constant power (CP) operating modes.
Combined Operating ModesIn the basic operating modes, a protection value for undervoltage and overcurrent can be set. This allows the combined operating modes CC+CV, CR+CC+CV, CP+CC+CV, CV+CC to be realized.
List FunctionIn all operating modes CC, CV, CR, CP the electronic loads can produce load profiles by List function. Up to 300 settings with variable dwell and ramp times are possible. Sample times can be defined for each section separately. The electronic load synchronously measures voltage and current and saves the data with timestamp.
Rectangular FunctionThe rectangular function provides a convenient way to generate a rectangular waveform by entering absolute time and amplitude values.
PWM FunctionWith the PWM function, the switching frequency and the duty cycle can be set for the two amplitude values in manual operation.
ModulatorThe modulator adds a sinusoidal, square-wave or triangular signal to a static setting in CC or CV mode. Frequency and modulation depth are adjustable.
Sweep FunctionTo determine V/I characteristics, a voltage ramp by means of start and end voltage and the corresponding duration of the sweep process is defined. The ramp can be rising or falling. During the execution of the sweep process, the measurement data is recorded. The electronic load adjusts the sampling time so that a maximum of 360 measurement points are recorded. After the function has been executed, the recorded measurement data can be viewed in the graphical "Data Viewer" or exported to a connected USB flash drive.
MPP TrackingThe Maximum Power Point Tracking (MPPT) function consists of the two sub-functions Sweeping and Tracking, which alternate continuously in an adjustable interval. If the measured open circuit voltage at startup is higher than the minimum voltage, the electronic load performs a sweep and then adjusts the global MPP found. The swept V/I curve is displayed together with the V/P curve in the function graph of the user interface. The currently determined MPP is marked by a '+' in the diagram. The V/I characteristic can be read via a data interface.
Energy Storage Test: Discharge FunctionThe discharge function tests energy storage devices such as batteries, ultracaps and electrolytic capacitors etc. by discharging them in CC, CP or CR mode. The discharge function can be combined with the list function so that pulsed discharge is possible. IUa discharge (CC+CV discharge) is also possible: the test object is discharged with constant current up to a defined voltage. This voltage is then kept constant until a defined minimum current is reached. Stop criteria are charge, energy, time, current, voltage. During data logging, a follow-up time can be defined to observe the regeneration phase.
Internal Resistance MeasurementThe electronic load can measure the DC internal resistance of the connected source. For this purpose, it uses a calculation method specified in various standards, e.g. DIN EN 61951, DIN EN 61960.
Measurement Data AcquisitionAutomatic data acquisition allows measurement data to be stored internally or directly to an external USB flash drive.
Trigger ModelVarious functions or settings can be triggered by a configurable trigger event:
- Activate/deactivate load input
- Start/stop LIST function
- Start/stop data acquisition
- Set triggered settings of all operating modes
Available trigger sources:
Control Speed SelectionFor certain DUTs or very long cables, it may be necessary to adjust the eload's regulation time constant to avoid oscillation and to achieve stable operation. The control speed can be selected from slow - medium - fast.
Watchdog FunctionWhen the watchdog function is activated, the output is switched off in the event of faulty communication with the control PC in order to protect the connected DUT.
Saving SettingsIn order to be able to quickly reconstruct recurring test tasks, the active settings can be stored in non-volatile memory (internally or on USB flash drive) so that they can be reloaded at a later time. 9 internal memory positions are available. The unit can selectively set reset values at power-up, the last active settings at power-down, or memory positions 1 to 9.
Data InterfacesThe following data interfaces are fitted as standard:
- GPIB Interface (option SCL02)
I/O PortThe standard I/O port provides analog and digital signals for external control.
- Analog setting of I and V with 0 ... 5 V or with 0 ... 10 V
- Analog protection setting of I or V with 0 ... 10 V
- Load activation
- Operating mode selection CC/CV
- Control speed selection
- Remote shut-down
- Readable digital input
- Trigger input
- Analog voltage monitoring output 0 ... 10 V
- Analog current monitoring output 0 ... 10 V
- Load input activation status
- Overload status
- Programmable logic output
- Trigger output