* Optional

The DP-HA Series laboratory power supplies offer a flexible output range for varying test tasks thanks to auto-ranging. Within the rated power range, you can use both higher voltages at lower currents and lower voltages at higher currents. This allows you to cover different operating points with the same power supply.

You define recurring test sequences yourself: Voltage, current, and power waveforms are set over time, stored in the device, and executed automatically. The device is operated directly from the front panel; no external computer is required to run the sequence. A battery charging function is also available.

RS232 with SCPI and RS485 with Modbus RTU are provided as standard for integration into computer-controlled test benches. The remote measurement compensates for voltage drops in the supply line of up to 2 V.

Autoranging in a compact design

Illustration of a DP-HA laboratory power supply.

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.

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.

Custom Time-Dependent Test Sequences
Create your voltage, current, and power waveforms to suit the test task and save the sequences in the device. A program can contain up to 100 steps. Specify the number of repetitions and start execution from the front panel or via the external trigger. Use a USB drive to transfer saved sequences to other devices.

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: Example from the Series—
As an example from the series, the DP155-20-1500HA model provides a maximum of 155 V, 20 A, and 1,500 W. Within the rated power of 1,500 W, up to 75 V at 20 A or approximately 9.68 A at 155 V are possible. Autoranging expands the available 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 complements 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, with their enclosures and electrical designs customized to meet 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 Measurement Input (Standard)
The remote measurement input measures the voltage directly at the load and allows for compensation of line losses up to 2 V. This is particularly helpful for 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. An interlock loop is not provided as standard or as an option in this series. The DP-HA series does not include analog inputs or outputs for setting or monitoring voltage or current.