* Optional

A laboratory power supply for a wider range of test tasks: The DP-HA Series combines programmable precision with an extended output range thanks to autoranging. Flexibly utilize the available power for applications requiring higher voltage and lower current or lower voltage and higher current. This expands your options at the test station and can reduce the need to switch between different power supplies.

Saved test programs, a battery charging function, and the easy-to-read color display make this series versatile even without an external controller. The permissible output combinations are determined by the voltage, current, and power limits of the selected model.

Saved test programs and the battery charging function can be configured directly on the front panel and executed without an external computer. RS232 with SCPI and RS485 with Modbus RTU support integration into automated test benches.

Autoranging in a compact design

Illustration of a DP-HA laboratory power supply. Please refer to the corresponding technical specifications for the design and dimensions of the selected model.

The compact design with a carrying handle makes it easy to move the unit between test stations. A temperature-dependent fan control system with five temperature sensors adjusts the cooling to the operating conditions. The ambient conditions specified in the manual must be observed during operation.

Removable rubber pads protect the front and back from physical impact. Without these pads, up to four units can be mounted in a 4U rack insert (sold separately). This creates a space-saving setup with four independently usable channels.

4.3-inch color display and front-panel controls
The color display shows setpoint and actual values as well as the time history of the output variables. A numeric keypad and a rotary encoder allow for direct value entry and menu navigation. The setting and display resolution is 1 mV / 1 mA or 10 mV / 10 mA, depending on the model. The accuracy is specified separately in the technical data.

Programmed Voltage and Current Profiles: Up to 300 program steps—including voltage, current, and time—can be stored in the device. The programs can be run for a specified number of cycles or repeated, and can be started manually or via an external trigger. Stored programs can be transferred to other devices via a USB drive. No external computer or controller is required for execution.

Battery Charging Function: The programmable charging function allows you to specify an application-specific charging profile. Voltage and current can also be logged via an external controller. The charging parameters and protective measures must be compatible with the connected battery.

Autoranging Explained Simply
The DP155-20-1500HA model offers a maximum of 155 V, 20 A, and 1,500 W. At 20 A, up to 75 V is therefore available. At 155 V, the current possible within the 1,500 W limit is approximately 9.68 A. Autoranging expands the usable output combinations but does not increase the rated power.

Dynamics and Specifications
The recovery time is ≤5 ms for a load change from 10% to 90%. Residual ripple and accuracy depend on the model. RMS and peak-to-peak values are not equivalent. The measurement value specified in the product data sheet is the relevant one in each case.

Application-Specific Extensions

Illustration of a DP-M power supply with an AP8 module. The design of the expansion is tailored to the corresponding power supply and the application.

Integrated reverse current protection and additional protection modules
The output rectifier stage provides basic protection against reverse currents of the same polarity within the device’s permissible limits. This does not imply unlimited reverse current capability or suitability for absorbing arbitrary load energy. Reverse voltages, high reverse currents, and the stored energy of the load must be taken into account during design.

Model AP9: Application-Specific Reverse Current and Reverse Voltage Protection
The AP9 supplements the integrated protection for demanding inductive or capacitive loads. The module is designed to order for the expected currents, voltages, and energy levels. Depending on the application, a combined protection circuit against high reverse currents and reverse voltages—particularly against reverse-polarity transients—or a design as an active braking chopper is possible. A braking chopper limits the energy fed back into the system by converting it into heat. The design, sizing, and permissible duty cycles are agreed upon on a case-by-case basis.

Model AP8: Additional output-side EMC filter with capacitance
AP8 combines a three-stage EMC filter with additional output capacitance. It serves to further reduce line-borne interference and stabilize the power supply to demanding loads. The design is tailored to the power supply unit, load, and dynamic requirements.

All AP modules are manufactured to order. cabinet and electrical specifications are based on the agreed-upon requirements.

Digital Control and External Program Triggers

Schematic illustration of the connections on a DP-HA laboratory power supply. The position and design may vary depending on the revision.

RS232 and RS485 (Standard)
Communication takes place via RS232 using SCPI and via RS485 using Modbus RTU. The documented protocols and included LabVIEW examples make it easier to develop your own control solutions.

remote-sensing input (Standard)
The remote-sensing input measures the voltage directly at the load and compensates for line losses of up to 2V. This is particularly helpful when dealing with high currents and longer connection cables.

External Trigger (Standard)
The trigger input is used to start or stop stored automatic sequences. The program trigger is not a safety interlock. A separate interlock loop for external blocking and enabling of the output is available upon request. The DP-HA series does not include analog inputs or outputs for setting or monitoring voltage or current.