This models in the 850W DC power supplies in the Series 2268 provide voltage and current output levels well suited for automated test applications. This offer maximum voltage output of 100V with maximum current output of 8.5A. Series 2268 power supplies allow outputting any current, including the maximum current, at any voltage. They provide both analog and digital control options and a number of digital interface options and can operate in constant voltage (CV), constant current (CC), or constant power modes to address a broad array of applications. These high-efficiency, soft-starting power supplies provide reliable performance and long life.

850W in the Most Compact Package
The Series 2268 supplies offer the highest power density in the smallest package. The Series 2268 supplies are packaged in a low profile 1U high, half-rack width enclosure. These supplies take up minimum space in a test rack. When multiple supplies are needed, these supplies can easily mount side-by-side in a test rack to provide two outputs in a 1U height space. Ventilation for the Series 2268 supplies is from the front of the instrument to the back so additional rack space for airflow above, below, or to the side of the supplies is not required. Thus, only 1U of total rack height is all that is needed. Furthermore the Series 2268 power supplies operate at temperatures up to 50°C so that they can perform reliably even in test racks that have elevated temperatures.

                                  

Use a Series 2268 DC supply as part of a control system. Analog control signals can program the supply’s output. In addition to driving the load, the supply’s two auxiliary outputs can drive external devices or circuits. The auxiliary outputs can eliminate the need for extra power sources in a test system. Interlock connections can turn off the supply’s output if an unsafe external condition is detected.

                                    

Control up to 30 Series 2268 power supplies through one interface to a master supply. The additional supplies are daisy-chained to the master through serial RS-485 connections.

A Full Complement of Control and Interface Options
Series 2268 power supplies offer users a wide range of interface options, including built-in LAN, USB, GPIB, RS-232, and RS-485 control interfaces. The supplies can also be controlled by analog control signals. A supply’s voltage output and current can be set using either voltage or resistance input values.

Both isolated and non-isolated analog inputs are available. When long control lines or control lines exposed to an electrically noisy environment create signal integrity concerns, the isolated analog inputs can reduce or eliminate the susceptibility to signal degradation.

An auto sequence program mode gives Series 2268 supplies the built-in intelligence needed to execute lists of commands. Multiple commands can be downloaded, stored in the power supply’s memory, and executed using a single command from the controller. The program can be repeated a specific number of times or cycled continuously. This ability to execute a set of commands internally saves test time by eliminating the delays involved in sending individual commands over a PC bus. 

For large power systems that require multiple power supplies, up to 30 Series 2268 supplies can be controlled through a single interface by linking all the supplies together through their RS-485 interfaces. That allows controlling all the supplies through a master unit, which can use any of the five standard PC interfaces. This greatly simplifies managing multiple power supplies in a single system. 

Auxiliary Outputs for External Device Control
In addition to the main output power, Series 2268 power supplies offer two auxiliary outputs, 15V output and a 5V output, for signaling and control tasks, such as to supply signals to a device handler or a test fixture control input. These auxiliary outputs can also drive external control relays. For test systems that require a few control signals or relay control, these outputs can eliminate the need for another power supply or data I/O card.

Expand Voltage or Current Capacity for Higher Output Requirements
For test applications that require a higher voltage or current output than a single supply can produce, up to two Series 2268 power supplies can be connected in series or up to four of them connected in parallel to produce the required output. Using the analog control lines, the supplies can be arranged in a master-slave configuration. The safety settings for the master supply control the complete configuration of supplies so that all supplies are protected.

When an application requires a bipolar output, two Series 2268 power supplies can be linked with the low terminal of one supply connected to the high terminal of the second one. This connection can be tied to the common of the bipolar load; one supply produces a positive output and the second supply effectively produces a negative output.

Protection for the Load and the Power Supplies
Series 2268 power supplies provide one set of parameters designed to protect the load from damage and another set that protect the supplies themselves. For applications that require outputting voltages only within a narrow range, Series 2268 supplies support setting both over-voltage and under-voltage shutdown levels. Over-current protection prevents excess current from damaging the load, the supply, or both. An over-temperature limit prevents excessively high temperatures that could damage the supply’s internal components.

The Series 2268 power supplies incorporate a standard foldback function which, when enabled, will turn the output off if the load condition causes the supply to switch between the CV and CC control modes. In addition, the Series 2268 supplies add a programmable delay time to the foldback function to allow a time delay before the output is turned off. Thus, if the supply is powering a load with a high in-rush current which is large enough to cause the supply to switch to the CC mode from the CV mode, the delay would prevent the foldback function from an unwanted shutdown of the output so that the load stays powered and reaches its steady-state current level. If an external interlock circuit loses continuity, the hardware output interlock can be used to turn off a supply’s output. Input/output lines allow external shutdown control and provide an output on/off status.

For test systems that integrate multiple Series 2268 supplies, loop protection allows up to four supplies to be shut down as a group; there is no need to shut down the whole system.


Rear panel of the 2268-20-42 and 2268-40-21 showing the bar output connectors and all analog and digital interface connectors.


Rear panel of the 60V and higher voltage versions showing the terminal block output connectors and all analog and digital interface connectors.