DC Electronic Loads

Technocomm offers a versatile portfolio of DC EA Power supply & Electronic Loads that fits for variety of test and measurement scenarios. Whether you are looking to equip an educational lab or integrate a power supply into a production test system, we have the right equipment for you. We provide the means for our customers to push the limits of technological progress in aerospace, defense and space.

Choose between our basic EA Power supply & Electronic Loads bench models that come in compact design and offer modular capabilities or high-performance products that can easily fits for power industrial labs. (PicoScope)

Programmable Electronic DC loads

  • Recovery into 380 V, 400 V or 480 V grids
  • Wide choice of voltages, current and powers Flexible input stage
  • Intuitive handling due to colour TFT touch panel
  • Multilingual display (ger, eng, chin, russ)
  • Extensive function generator Regulation modes CV, CC, CP and CR
  • For photovoltaics and battery tests and more
  • Protective features (OVP, OCP, OT…)
  • USB port as standard
  • Plug&Play slot for digital interfaces
  • All interfaces galvanically isolated
  • Remote control software (Windows) LabVIEW VI package
  • SCPI & Modbus protocol 19“ enclosures in 3U
  • Customer specific cabinets up to 480 k

SeriesPowerVoltageCurrent
EA-ELR 10060 4U30kW2000V1000A
EA-ELR 9000 3U10.5kW1500V510A
EA-ELR 9000 HP15kW1500V510A
EA-ELM 5000 6U3200W200V25A

Model

Power

Voltage

Current

Resistance

Weight

ELR 9080-170 HP

0…5 kW

0…80 V

0…170 A

0.02…25 Ω

≈18 kg (39.7 lb)

ELR 9200-70 HP

0…5 kW

0…200 V

0…70 A

0.1…150 Ω

≈18 kg (39.7 lb)

ELR 9360-40 HP

0…5 kW

0…360 V

0…40 A

0.3…520 Ω

≈18 kg (39.7 lb)

ELR 9500-30 HP

0…5 kW

0…500 V

0…30 A

0.5…1000 Ω

≈18 kg (39.7 lb)

ELR 9750-20 HP

0…5 kW

0…750 V

0…20 A

1.2…2200 Ω

≈18 kg (39.7 lb)

ELR 9080-340 HP

0…10 kW

0…80 V

0…340 A

0.01…13 Ω

≈25 kg (55.1 lb)

ELR 9200-140 HP

0…10 kW

0…200 V

0…140 A

0.05…75 Ω

≈25 kg (55.1 lb)

ELR 9360-80 HP

0…10 kW

0…360 V

0…80 A

0.15…260 Ω

≈25 kg (55.1 lb)

ELR 9500-60 HP

0…10 kW

0…500 V

0…60 A

0.25…500 Ω

≈25 kg (55.1 lb)

ELR 9750-40 HP

0…10 kW

0…750 V

0…40 A

0.6…1100 Ω

≈25 kg (55.1 lb)

ELR 9080-510 HP

0…15 kW

0…80 V

0…510 A

0.006…10 Ω

≈32 kg (70.5 lb)

ELR 9200-210 HP

0…15 kW

0…200 V

0…210 A

0.033…50 Ω

≈32 kg (70.5 lb)

ELR 9360-120 HP

0…15 kW

0…360 V

0…120 A

0.1…180 Ω

≈32 kg (70.5 lb)

ELR 9500-90 HP

0…15 kW

0…500 V

0…90 A

0.16…340 Ω

≈32 kg (70.5 lb)

ELR 9750-60 HP

0…15 kW

0…750 V

0…60 A

0.4…740 Ω

≈32 kg (70.5 lb)

ELR 91000-40 HP

0…15 kW

0…1000 V

0…40 A

0.8…1300 Ω

≈32 kg (70.5 lb)

ELR 91500-30 HP

0…15 kW

0…1500 V

0…30 A

2.5…3000 Ω

≈32 kg (70.5 lb)

  • Wide AC input range 90-264V AC
  • Wide choice of voltages, current and powers
  • Flexible input stage
  • Intuitive handling due to colour TFT touch panel with multi lingual display (EL 9000 B HP)
  • Extensive function generator
  • Regulation modes CV, CC, CP and CR
  • For photovoltaics and battery tests and more
  • Protective features (OVP, OCP, OT…)
  • Master-slave feature
  • USB as standard port
  • Plug&Play slot for digital interfaces
  • All interfaces galvanically isolated
  • Remote control software (Windows) LabVIEW VI package
  • SCPI & Modbus protocol
  • 2Q models for power extension of the HP models or for two-quadrants operation with power supplies
  • 19“ enclosures in 2U of height

Series

Power

Voltage

Current

Display

Optional digital interfaces

EL 9000 B HP

600 W – 2400 W

80 – 750 V

10 – 170 A

TFT Touch

CAN, Profibus, Profinet, EtherCAT, Ethernet, CANopen, RS232

EL 9000 B 2Q

600 W – 2400 W

80 – 750 V

10 – 170 A

LEDs

CAN, Profibus, Profinet, EtherCAT, Ethernet, CANopen, RS232

Model

EL 9080-85 B HP EL 9080-85 B 2Q

EL 9200-35 B HP EL 9200-35 B 2Q

EL 9360-20 B HP EL 9360-20 B 2Q

EL 9500-15 B HP EL 9500-15 B 2Q

EL 9750-10 B HP EL 9750-10 B 2Q

DC: Voltage

0…80 V

0…200 V

0…360 V

0…500 V

0…750 V

DC: Current

0…85 A

0…35 A

0…20 A

0…15 A

0…10 A

DC: Power @ 25°C

0…1200 W

0…1000 W

0…900 W

0…600 W

0…600 W

DC: Power @ 40°C

0…1000 W

0…1000 W

0…900 W

0…600 W

0…600 W

DC: Resistance

0.08…30 Ω

0.44…200 Ω

1.4…600 Ω

2.5…1200 Ω

6…2500 Ω

UMIN for IMAX (1

2.2 V

≈2 V

≈2 V

≈6.5 V

≈5.5 V

Weight

9 kg (19.8 lb)

9 kg (19.8 lb)

9 kg (19.8 lb)

9 kg (19.8 lb)

9 kg (19.8 lb)

Model

EL 9080-170 B HP EL 9080-170 B 2Q

EL 9200-70 B HP EL 9200-70 B 2Q

EL 9360-40 B HP EL 9360-40 B 2Q

EL 9500-30 B HP EL 9500-30 B 2Q

EL 9750-20 B HP EL 9750-20 B 2Q

DC: Voltage

0…80 V

0…200 V

0…360 V

0…500 V

0…750 V

DC: Current

0…170 A

0…70 A

0…40 A

0…30 A

0…20 A

DC: Power @ 25°C

0…2400 W

0…2000 W

0…1800 W

0…1200 W

0…1200 W

DC: Power @ 40°C

0…2000 W

0…2000 W

0…1800 W

0…1200 W

0…1200 W

DC: Resistance

0.04…15 Ω

0.22…100 Ω

0.7…300 Ω

1.25…600 Ω

3…1250 Ω

UMIN for IMAX (1

≈2.2 V

≈2 V

≈2 V

≈6.5 V

≈5.5 V

Weight

13 kg (28.7 lb)

13 kg (28.7 lb)

13 kg (28.7 lb)

13 kg (28.7 lb)

13 kg (28.7 lb)

  • Wide AC input range 90-264V
  • Flexible input stage Intuitive handling due to colour TFT touch panel (PSI)
  • Multilingual display (ger, eng, chin, russ)
  • Extensive function generator
  • Regulation modes CV, CC, CP and CR
  • For photovoltaics and battery tests and more
  • Protective features (OVP, OCP, OT…)
  • USB as standard port
  • Ethernet & analog interface integrated (EL 9000 DT)
  • All interfaces galvanically isolated
  • Remote control software (Windows)
  • LabVIEW VI package SCPI & Modbus protocol
  • Enclosures as tower or desktop version
  • Compact size and high performance

Series

Power

Voltage

Current

Handle

Orientation

Optional digital interfaces

EL 9000 DT

400 W – 1200 W

80 – 750 V

5 – 60 A

ja

lying (DT models)

EL 9000 T

400 W – 660 W

80 V / 200 V / 500
V

8 A / 18 A / 45 A

nein

standing (T model)

USB + Ethernet + Analog

Model

EL 9080-45 DT

EL 9200-18 DT

EL 9360-10 DT

EL 9500-08 DT

EL 9750-05 DT

DC: Voltage

0…80 V

0…200 V

0…360 V

0…500 V

0…750 V

DC: Current

0…45 A

0…18 A

0…10 A

0…8 A

0…5 A

DC: Power @ 25°C

0…600 W

0…500 W

0…450 W

0…400 W

0…400 W

DC: Power @ 40°C

0…500 W

0…500 W

0…450 W

0…400 W

0…400 W

DC: Resistance

0.09…30 Ω

0.5…170 Ω

1.6…540 Ω

3…1000 Ω

7…2200 Ω

Weight

6.5 kg (14.3 lb)

6.5 kg (14.3 lb)

6.5 kg (14.3 lb)

6.5 kg (14.3 lb)

6.5 kg (14.3 lb)

Model

EL 9080-60 DT

EL 9200-36 DT

EL 9360-20 DT

EL 9500-16 DT

EL 9750-10 DT

DC: Voltage

0…80 V

0…200 V

0…360 V

0…500 V

0…750 V

DC: Current

0…60 A

0…36 A

0…20 A

0…16 A

0…10 A

DC: Power @ 25°C

0…1200 W

0…1000 W

0…900 W

0…600 W

0…600 W

DC: Power @ 40°C

0…800 W

0…800 W

0…800 W

0…600 W

0…600 W

DC: Resistance

0.09…30 Ω

0.5…170 Ω

1.6…540 Ω

3…1000 Ω

7…2200 Ω

Weight

7.5 kg (16.5 lb)

7.5 kg (16.5 lb)

7.5 kg (16.5 lb)

7.5 kg (16.5 lb)

7.5 kg (16.5 lb)

Model

EL 9080-45 T

EL 9200-18 T

EL 9500-08 T

DC: Voltage

0…80 V

0…200 V

0…500 V

DC: Current

0…45 A

0…18 A

0…8 A

DC: Power @ 25°C

0…660 W

0…500 W

0…400 W

DC: Power @ 40°C

0…550 W

0…500 W

0…400 W

DC: Resistance

0.12…40 Ω

1…340 Ω

6…2000 Ω

Weight

7 kg (15.4 lb)

7 kg (15.4 lb)

7 kg (15.4 lb)

Höcherl & Hackl has been developer and producer of electronic loads and testing devices for power supply, energy storage units and fuel cells. We look back at a solid company development. Through continuous growth we could establish our company to be one of the leading providers of electronic loads in the German and in international markets.

DC loads

  • Input voltage up to 400 V
  • Load current up to 220 A
  • Power up to 10.8 kW
  • Energy recycling to the local power grid
  • Low heat waste, silent, lab operation
  • Basic operating modes CC – CV – CR – CP
  • Combined operating modes CC+CV, CR+CC+CV, CP+CC+CV, CV+CC
  • Ethernet + USB + RS-232 + CAN as standard
  • GPIB optional
  • Intuitive operation
  • Fast operation by shortcuts
  • Settings toggling
  • MPP tracking
  • Energy storage test
  • Internal resistance measurement
  • SCPI programming with measurement function
  • Dynamic loads with synchronized DAQ
  • Trigger model
  • Data storage directly to USB mass storage device
  • Adjustable protections for undervoltage and overcurrent
  • Galvanically isolated fast I/O port optional (analog control input, analog monitor outputs for voltage and current, digital input and programmable output)
  • Digital Master-Slave operation
  • Settings saving
  • Electronic protection
  • Bilingual help system (German, English)
  • 2 free calibrations (with registration)

Description

ERI Series electronic loads feed the consumed energy back to the local power grid. Another feature of these devices is an extensive variety of standard data interfaces. Apart from Ethernet, USB and RS-232 there is a standard CAN interface. GPIB can be installed as an option (ERI02). Programming is done in SCPI with an extensive command syntax.

Cooling

ERI loads recover the consumed energy instead of converting to thermal energy. Thus, electricity costs are reduced and the environment is only slightly warmed. As a consequence, in many cases air-condition is unnecessary. Energy recycling loads do not need powerful fans. That makes the devices acceptably quiet and therefore perfectly fit for laboratory operation.

Energy Recycling

The consumed energy is fed back to the mains supply with an efficiency of ca. 90 %. The operation in the sense of a power generation into the public electricity grid is not provided with these energy recycling loads. The load must be connected to a low-voltage mains supply with a fixed installed and separately fused supply line. The ERI load has a simple and non-redundant monitoring of the power supply. If limit values are exceeded, it switches off the power stage unit. This monitoring does not replace any grid or system protection which must be installed if necessary for the protection of persons and the local grid.

Operating Modes and Functions

Basic and Combined Operating Modes

The devices have the operating modes constant current (CC), constant voltage (CV), constant resistance (CR) and constant power (CP). Furthermore, protection values for undervoltage and overcurrent can be set in each operating mode. This results in the combined operating modes CC+CV, CR+CC+CV, CP+CC+CV, CV+CC.

Dynamic Load with List  Function

Dynamic operation (LIST function) can be configured by up to 300 list point settings. The electronic load saves the synchronously acquired measurement data with timestamp.

Data Acquisition

An automatic data acquisition function allows to store measurement data internal or directly on an external USB flash drive.

Energy Storage Test/Discharge Function

The discharge function discharges energy storage devices such as accumulators, batteries, ultracaps etc. in a controlled manner under definable switch-off conditions. The values determined in the process, such as charge and energy, can be read locally and via a data interface.

Internal Resistance Measurement

The electronic load can measure the DC internal resistance of the connected test object. For this purpose it uses a calculation method which is specified in various standards, e.g. DIN EN 61951, DIN EN 61960.

Watchdog Function

If the watchdog function is activated, the load input is switched off in case of faulty communication with the control PC in order to protect the connected DUT.

MPP Tracking (option PLI21)

The Maximum Power Point Tracking (MPPT) function is used to test solar or photovoltaic modules. For this purpose the maximum power point (MPP) of the connected DUT is controlled in CV mode.

Trigger Model

A configurable trigger model controls data acquisition, static and dynamic settings.

Parallel Connection in Master-Slave operation

To increase the power or current capability electronic loads of equal model can be operated in parallel in Master-Slave mode as one system. ERI series loads need the optional I/O port (ERI06) for this purpose.

Loading Capacity

The model range covers power classes from  600 W, up to 28,000 W continuous power rating. In addition the models up to 300 V have an overload capability. The height and duration of the possible overload depends on the temperature of the power stage. The unit indicates the currently possible overload. Therefore the units can be used  even for considerably more powerful applications.

Protections

  • Current limitation
  • Power limitation
  • Overtemperature protection
  • Simple mains supply monitoring

Data Interfaces

The following data interfaces are included as standard:

  • Ethernet
  • USB
  • RS-232
  • CAN

Optionally deliverable:

  • GPIB (option ERI02)

LabVIEW drivers are certified by National Instruments.

Galvanically Isolated Fast I/O Port (Option ERI06)

Optional galvanically isolated I/O port to prevent ground loops, for following functions:

  • Load setting C and V
  • Analog setting of C and V protections
  • Load on-off
  • Operating mode selection
  • Voltage monitor output
  • Current monitor output
  • Trigger input
  • Trigger output
  • Digital input
  • Programmable digital output

Calibration

A free Factory Calibration Certificate (FCC) is supplied with the devices. The calibration process is subject to supervision in accordance with DIN EN ISO 9001. The calibration certificate documents the traceability to national standards to illustrate the physical device in accordance with the international System of Units (SI). Within the 2-year warranty period, we will calibrate a second time free of charge if the respective device (serial number) will have been registrated at H&H.

Know More:
  • Input voltage up to 800 V
  • Load current up to 120 A
  • Power up to 1200 W
  • I/O Port as standard
  • Optional Ethernet + USB + RS-232
  • Optional CAN Interface
  • Optional GPIB Interface (PLA4xx and greater)
  • CC – CV – CR – CP mode
  • Protections for current and voltage
  • Maximum Power Point Tracking (MPPT)
  • V/I Characteristic function
  • Digital Master-Slave operation
  • Watchdog at remote control
  • SCPI programming with DAQ function
  • Dynamic loads
  • Depending on model, temporary overload capacity up to 1.5-fold power
  • Electronic protection
  • Silent fan cooling
  • 19 inch installation possible
  • Load inputs at front and rear side
  • 2 free calibrations after registration
Description

PLA series electronic loads combine classic design, large display with modern interfaces and great functionality. The highlight of the PLI series is the extensive variety of optional interfaces. In addition to Ethernet, USB, RS-232 can be installed and also a CAN interface. In addition, for devices with 400 W GPIB is optionally available. I/O port ist standard. Programming is done in SCPI syntax.

Functions

The units provide constant current, constant voltage, constant resistance and constant power mode. In addition, protections for current and voltage can be set in any mode. Dynamic operation can be configured by up to 100 list point settings. A data acquisition function allows to save 100 measurement points (time, voltage, current) on an internal memory chip.

Special Functions

V/I Characteristic Function:In the V/I characteristic function, a sequence of voltage values is interpolated linearly to a sequence of current values (2 to 100 values each). Depending on the value of the input voltage, the electronic load sets the current which corresponds to the interpolated point of the characteristic. In this way non-linear characteristics such as diode characteristics can be simulated. Maximum Power Point Tracking (MPPT): An extensive Maximum Power Point Tracking (MPPT) function for testing photovoltaic panels can be activated. In variable sweep periods, the V/I characteristic of the panel is measured and stored. The sweep direction is selectable. The absolute maximum power found is controlled until the function is stopped or a certain minimum voltage is underrun. If the panel voltage is above the minimum voltage again, the load continues the sweep and control process. Digital Master-Slave Operation: To increase the power or current capability up to 5 electronic loads of equal type can be operated in parallel in Master-Slave mode as one system. The Master unit controls the total input current of the system. This unit also shows the system’s total measurement values at its display and returns them in case of query via one of the data interfaces. The voltage measured at the Master unit is the base for the controlled settings in voltage mode, power mode and resistance mode. Watchdog: When controlled via a data interface, a watchdog can be activated to protect the load input and thus the DUT, which switches off the load input if the communication interface fails or malfunctions.

Loading Capacity

The type spectrum contains models in the power categories 200 W, 400 W, 800 W and 1200 W. In addition, the models up to 300 V have an overload capability. The level and duration of the possible overload depends on the temperature of the power stage. Therefore the units can be used even for considerably more powerful applications for a short time.

Protections
  • Current limitation
  • Power limitation
  • Overtemperature protection
  • Overvoltage indicator
  • Undervoltage indicator
  • Protection of the GND lines at the I/O Port
I/O Port

The standard I/O Port provides the following functions:

  • Load setting C and V
  • Load on/off
  • Voltage monitor output
  • Current monitor output
Calibration

A free Factory Calibration Certificate (FCC) is supplied with the devices. The calibration process is subject to supervision in accordance with DIN EN ISO 9001. The calibration certificate documents the traceability to national standards to illustrate the physical device in accordance with the international System of Units (SI). Within the 2-year warranty period, we will calibrate a second time free of charge if the respective device (serial number) will have been registrated at H&H.

  • Input voltage up to 1,200 V
  • Load current up to 2,700 A
  • Power from 600 W to 28,800 W
  • Temporary power overload capacity, depending on model
  • Models with integrated zero-volt supply (ZV models)
  • Models with several current setting and measuring ranges (MR models)
  • High power density up to 2,100 W in 2 U (3,200 W in 3 U)
  • Basic operating modes CC – CV – CR – CP
  • Combined operating modes CC+CV, CR+CC+CV, CP+CC+CV, CV+CC
  • Ethernet + USB + RS-232 + CAN as standard
  • GPIB optional
  • Intuitive operation
  • Quick operation by shortcuts
  • Setting toggling
  • Constant current, voltage, resistance and power mode
  • MPP Tracking
  • Digital Master-Slave operation
  • Energy storage test
  • Ri measurement
  • Dynamic load with synchronous DAQ
  • Trigger model
  • SCPI programming with measurement
  • USB MSD as measurement data memory
  • Adjustable protections for overcurrent and undervoltage
  • Analog monitoring outputs for voltage and current
  • Analog control input
  • Digital input and programmable control output
  • Silent fan cooling
  • Settings saving
  • Electronic protection
  • Bilingual help system (German and English)
  • 2 free calibrations (with device registration)

Description

All-rounders from H&H: the PLI series. With a huge model range, many standard functions, locally operated via the intuitive user interface or remotely via one of the many standard interfaces. Programming is done in SCPI syntax with a high command volume.

Zero-Volt Models – PLIxxxxZV

Special applications, such as fuel cell tests, need to load the DUT down to almost 0 V. For these purposes we supply a range of models with an integrated zero-volt supply. When I/O port signals are to be used, the GND of the I/O port must be galvanically isolated from the negative load input. Therefore we recommend to install the optional galvanically isolated I/O port (option PLI06) at these models.

Multi-Range Models – PLIxxxxMR

A model variant with 3 or 4 “real” current ranges allows the setting and measurement of current, power and resistance over a wide range of values with high resolution and accuracy. Especially solar and PV applications have high requirements at this point. The ranges are graduated with factor 10 each.

Operating Modes and Functions

Basic and Combined Operating Modes

The devices have the operating modes constant current (CC), constant voltage (CV), constant resistance (CR) and constant power (CP). Furthermore, protection values for undervoltage and overcurrent can be set in each operating mode. This results in the combined operating modes CC+CV, CR+CC+CV, CP+CC+CV, CV+CC.

Dynamic Load with List  Function

Dynamic operation (LIST function) can be configured by up to 300 list point settings. The electronic load saves the synchronously acquired measurement data with timestamp.

Data Acquisition

An automatic data acquisition function allows to store measurement data internal or directly on an external USB flash drive.

Energy Storage Test/Discharge Function

The discharge function discharges energy storage devices such as accumulators, batteries, ultracaps etc. in a controlled manner under definable switch-off conditions. The values determined in the process, such as charge and energy, can be read locally and via a data interface.

Internal Resistance Measurement

The electronic load can measure the DC internal resistance of the connected test object. For this purpose it uses a calculation method which is specified in various standards, e.g. DIN EN 61951, DIN EN 61960.

Watchdog Function

If the watchdog function is activated, the load input is switched off in case of faulty communication with the control PC in order to protect the connected DUT.

MPP Tracking (option PLI21)

The Maximum Power Point Tracking (MPPT) function is used to test solar or photovoltaic modules. For this purpose the maximum power point (MPP) of the connected DUT is controlled in CV mode.

Trigger Model

A configurable trigger model controls data acquisition, static and dynamic settings.

Loading Capacity

The model range covers power classes from  600 W, up to 28,000 W continuous power rating. In addition the models up to 300 V have an overload capability. The height and duration of the possible overload depends on the temperature of the power stage. The unit indicates the currently possible overload. Therefore the units can be used  even for considerably more powerful applications.

Protections

  • Current limitation
  • Power limitation
  • Overtemperature protection
  • Protection of the  GND lines at the  Analog I/O Port

Data Interfaces

The following data interfaces are included as standard:

  • Ethernet
  • USB
  • RS-232
  • CAN

Optionally deliverable:

  • GPIB (option PLI02)

LabVIEW drivers are certified by National Instruments.

Analog I/O Port

The standard analog I/O port provides the following functions:

  • Load setting C and V
  • Analog setting of C and V protections
  • Load on-off
  • Operationg mode selection
  • Voltage monitor output
  • Current monitor output
  • Trigger input
  • Trigger output
  • Digital input
  • Programmable control output

Galvanically Isolated Analog I/O Port

For the galvanic isolation between the Analog I/O Port and the load terminals the PLI06 option can be installed. Isolation voltage is 800 V. Using this board also prevents ground loops.

Help System

A help system for most menu items is integrated in the user interface. The help system’s language can be set to German or English.

Calibration 

A free Factory Calibration Certificate (FCC) is supplied with the devices. The calibration process is subject to supervision in accordance with DIN EN ISO 9001. The calibration certificate documents the traceability to national standards to illustrate the physical device in accordance with the international System of Units (SI). Within the 2-year warranty period, we will calibrate a second time free of charge if the respective device (serial number) will have been registrated at H&H.

Know More:

AC loads

  • Frequency range up to 1,000 Hz
  • Single-phase and three-phase devices
  • Input voltage 280 V and 500 V
  • Single-phase power from 500 W to 21,000 W
  • Three-phase power from 3 x 1,400 W to 3 x 8,400 W
  • Parallel, in star or in delta connectable
  • User interface with 4.3″ touchscreen
  • Operation by mouse
  • Operating modes constant current, constant resistance, constant voltage, constant power
  • Arbitrary current waveforms
  • Uninterrupted change of waveforms
  • Synchronization to load input, line or extern
  • Variable phase cut from -180° to +180°
  • Variable crest factor up to 4
  • Automatic amplitude correction
  • Variable phase shift in combination with crest factor
  • Harmonics up to the 25th order, even and odd
  • Variable current protection
  • List operation, also with three-phase current
  • LAN, USB, RS-232 standard, GPIB optional
  • Analog I/O port with real-time signals optional
  • Manual on board

Description

ACL series loads are suitable for DC and AC voltages up to 1,000 Hz. There are single-phase models as well as three-phase loads which combine 3 channels or phases, respectively, in one housing. Ethernet, USB, RS-232, CAN, I/O interface and a system bus for Master-Slave operation are built in as standard, a GPIB interface is available as an option. Programming is done in SCPI.

Operating Modes

The ACL series loads have constant current, constant resistance, constant power and constant voltage modes (CC, CR, CP, CV Mode). In AC operation, the set waveform is applied to the load current, independent of the input voltage. In resistance mode, the current level and waveform depend on the level and waveform of the input voltage. In power and voltage mode, the power or voltage is controlled by software by adjusting the input current.

Input Mode, Synchronization

The input mode defines the kind of voltage the electronic load expects at the input:

  • DC: direct voltage
  • AC: alternating voltage within the specified frequency range with synchronization to input voltage, line/mains voltage, external signal
Protection, Monitoring
  • Adjustable overcurrent protection
  • Overpower protection
  • Overtemperature protection
  • Overvoltage indication
  • Undervoltage indication
I/O Port (Option ACL06)

All inputs and outputs of the optional I/O port are galvanically isolated from the load input. The control inputs can be operated by 2 … 24 V. Signals for:

  • Analog load setting from 0 … 5 V or 0 … 10 V in CC mode
  • Operating mode selection
  • Input mode (AC, DC)
  • Synchronization source (input, line, extern)
  • Load activation
  • Control source selection (intern, extern)
  • Trigger input
  • Trigger output
  • Synchronization input
  • Remote shut-down input
  • Analog voltage monitor output 0 … 10 V
  • Analog current monitor output 0 … 10V
  • Analog monitor outputs as proportional AC curve or rms value, selectable
  • Programmable digital output
  • Status output for load input activation
  • Status output for overload

Single and 3-Phase Loads

Besides single-channel AC loads ACLS, the models of the ACLT series have been developed for loading three-phase systems. They combine 3 AC load channels in one housing. The 3 load channels can be used to load 3 different DUTs in AC or DC operation or to test a three-phase system. In the so-called balanced mode, all channels are loaded with the same setpoint and the same waveform. In synchronization mode Line, channel A synchronizes to the mains voltage, channels B and C are each phase-shifted by 120°. To increase the maximum load current, several channels of an ACLT three-phase device or several ACLS single-phase devices can be connected in parallel. Several single-phase devices can be connected to form a Master-Slave system.

User Interface

In addition to the load input, which is controlled by a large push-button, and the rotary knob for adjusting the setting value, the devices are operated by intuitive menu navigation via a 4.3″ touch display like it is known with smartphones. The most common functions can be accessed via shortcuts. An associated help window is available for each dialog window, explaining the meaning of the respective elements. The help language can be set to German or English.

Mouse

If you prefer to operate by mouse, you can use the USB port on the front – the H&H mouse is included.

Manual on Board

The ACL series user manual is stored in PDF format in the internal device memory. This can be copied to a USB flash drive or, conversely, updated from a USB flash drive if a newer version is available, e.g. after a firmware update with new functions. Thus, the user manual corresponding to the installed firmware doesn’t get lost.

Waveforms
  • Crest Factor, Phase Cut, Phase shift

For sine waveforms the crest factor (CF) can be adjusted from 1.4142 to 4.0. The load corrects the resulting amplitude so that the RMS value remains constant. For each waveform, a phase cut (PC) and a phase shift (PS) of the current waveform can be set in the range from -180 to +180°. Depending on the phase angle, the RMS value of the current changes. The phase shift must be combined with a phase cut or a crest factor. A phase shift in the sense of a purely capacitive or inductive load is not possible.

  • Harmonics

In the waveform with harmonics, the amplitudes of the basic wave normalized from 0 to 1 as well as the up to 24 harmonics (even and odd) are summed up. The load corrects the resulting amplitude so that the RMS value remains constant.

  • Arbitrary Waveforms

The definition of a period with 360 single points ensures maximum flexibility. The basis is either a sine, a square or a triangle signal, which can then be changed point by point. Depending on the waveform, the RMS value of the current changes.

Load Profile (LIST Function)

In all operating modes, the ACL load can emulate load profiles by means of the LIST function. Up to 300 setpoints of variable duration with associated ramp times are possible. In AC mode, the LIST function serves as a load profile of RMS values with the active waveform. Sampling times can be defined separately for each list section. Voltage and current are measured synchronously and stored with a time stamp.

Rectangular Function

Likewise for all operating modes, the rectangular function offers a simple variant for changing between 2 setting values with adjustable durations. In AC mode, the rectangle function serves as a load profile of 2 rms values with the active waveform.

DAQ Acquisition (DAQ)

The electronic load can also store synchronous data records of voltage and current with time stamp in a defined interval, independent of the LIST function. Up to 40,000 data records are stored in a ring buffer. Once recording is complete, the data is read out via a data interface or transferred to a USB flash drive.

Static Data Logging

During slow processes, the electronic load can store voltage and current with timestamps directly on a USB flash drive in local mode. Sampling intervals are in the range of seconds.

Trigger Model

In remote operation via a data interface, several functions can be activated by a configurable trigger event:

  • Activation/deactivation of list execution
  • Activation/deactivation of data acquisition
  • Activation/deactivation of load input
  • Setting of all triggered setting values of all operating modes

Available trigger sources: Extern, Bus.

Save Settings

In order to quickly reconstruct frequently recurring test tasks, the settings active in the electronic load can be stored non-volatile so that they can be reloaded later on. 9 memory positions are available. The ACL load can optionally set the reset state when switching on, the last active settings at power-off or memory positions 1 to 9.

Watchdog Function

To protect the DUT from communication problems, the electronic load in digital remote control mode has a watchdog function that switches off the load input if the previously programmed watchdog delay time expires without the watchdog being reset. The watchdog delay time is set by SCPI command, another command activates the watchdog. When the watchdog is active, a control program must ensure that the command to reset the watchdog is periodically sent to the electronic load.

Display of Measurements

Depending on the focus on the display, more or less measured values are shown per channel. A single-phase ACLS device displays the following measured values in the main display: RMS value voltage, RMS value current, resistance, active power, apparent power, reactive power, frequency, power factor, crest factor. If all channels ABC of a multi-channel or three-phase device are focused, the effective value of the voltage and the effective value of the current are displayed for each channel. All these measured variables can be queried via one of the data interfaces using a SCPI command.

Waveform Display

The last measured period of current and voltage is measured with 360 points and displayed in the Measured Waveform dialog.

Yt Graph

The Yt-Graph shows the time course of the RMS value of voltage, current and/or power of the focused channel.

Calibration 

A free Factory Calibration Certificate (FCC) is supplied with the devices. The calibration process is subject to supervision in accordance with DIN EN ISO 9001. The calibration certificate documents the traceability to national standards to illustrate the physical device in accordance with the international System of Units (SI). Within the 2-year warranty period, we will calibrate a second time free of charge if the respective device (serial number) will have been registrated at H&H.

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Multi-Channel loads

  • Configurable multi-channel load
  • Up to 12 channels in 19“ , 2 U
  • Tailored configurations possible with modules in 4 voltage and 4 power classes
  • 150 W – 300 W – 450 W – 600 W modules
  • Input voltages 40 V – 60 V – 120 V – 240 V
  • Load currents from 1 A to 120 A
  • CC – CV – CR – CP mode
  • Dynamic loads
  • 1,800 W total power
  • Operated via graphical user interface with integrated help system
  • SCPI programming with measurement function
  • Internal measurement data storage
  • Electronic protection
  • Analog monitoring outputs for voltage and current
  • Analog control input
  • Extensive data interfaces
  • 19 inch mountable
  • Channel expansion via Slave devices
  • Trigger system
  • Discharge function
  • Watchdog function
  • LabVIEW drivers and software tools available for download
  • 2 free calibrations
Configuration

The PMLA electronic multi-channel load has up to 3 cooling units, each with 4 mounting positions for load modules. 150 W, 300 W, 450 W or 600 W load modules are available. Depending on power, a module occupies one (150 W), two (300 W), three (450 W) or four (600 W) mounting positions.

Load Modules

The modules are available in four different voltages 40 V, 60 V, 120 V and 240 V and currents from 1 A up to 120 A. Various loads can be configured, e.g.: 1 x 600 W + 1 x 450 W + 2 x 300 W + 1 x 150 W The total power is max. 1,800 W. The loads can therefore be easily configured to test units with multiple outputs. The load inputs are galvanically separated. Very simple systems can therefore be specially configured for requirements with multi-channel Burn-In equipment.

Operating Modes and Functions

The following operating modes are possible:

  • Current mode
  • Voltage mode
  • Resistance mode
  • Power mode
  • Dynamic mode with up to 100 setting values

An adjustable current or voltage protection as well as voltage and current measurement functions are available.

Measurement Data Storage

A data acquisition function records up to 100 measurement points (time, voltage, current) at each channel and saves it internally.

User Interface

The master device has a graphical user interface. All channels, also those of connected slave devices, can be operated.

I/O Port

I/O Port for the following functions.

  • Load setting C and V
  • Load on/off
  • Voltage monitor output
  • Current monitor output
  • Sense inputs
Calibration

A free Factory Calibration Certificate (FCC) is supplied with the devices. The calibration process is subject to supervision in accordance with DIN EN ISO 9001. The calibration certificate documents the traceability to national standards to illustrate the physical device in accordance with the international System of Units (SI). Within the 2-year warranty period, we will calibrate a second time free of charge if the respective device (serial number) will have been registrated at H&H.

–> Conditions for a second free calibration

For use under laboratory conditions, H&H recommends a calibration interval of 2 years. This is an empirical value that can be used as a guide for the first period of use. Depending on the intended use, service life, relevance of the application and ambient conditions, the operator should adjust this interval accordingly

Software Tools und Drivers

LabVIEW drivers and software tools are available for download free of charge.

Applications
  • Calibration of driver outputs
  • Consumer test of electrical systems
Test of:
  • Batteries and accumulators
  • Cables
  • Absorbers
  • DC/DC converters
  • Electronic assemblies
  • Electronic fuses and cut-off
  • Fuse boxes
  • ECUs
  • Power distributors
Trigger System

By a trigger system all channels can synchronously be switched on or a programmed waveform can be started.

Discharge Function

For testing energy storage devices such as batteries, ultracaps or capacitors, each channel can discharge a connected DUT statically or with defined load profiles up to one or more stop criteria. IUa discharge is also possible, here a constant current is applied until a minimum voltage is reached. This voltage is then kept constant by reducing the current until the current falls below a defined value. Stop criteria are charge, energy, time, current, voltage.

Watchdog Function

An adjustable watchdog function may protect the DUT by switching the input off in case of disrupted data communication.

Cooler and Load Modules

At each device three cooling units can be installed. At each cooling unit one, two or four modules can be installed, depending on type.

Terminals

The load terminals are provided at pluggable terminal strips.

Cooling

The air transport from the front panel to the rear panel enables the assembly of compact rack systems without gaps. The temperature-controlled fan control provides a pleasant operating noise.

Help System

A help system for most menu items is integrated in the user interface. The help system’s language can be set to German or English.

Documentation

Each device is supplied with a user manual as PDF file and printed General Safety Instructions, each in German and English.

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