Keithley 2268-20-42
DC Power Supply, 20V, 42A, 850W

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Product Overview

Keithley 2268-20-42 Power Supply (predecessor to the Keithley 2260B-30-72)

Rent Keithley DC Power Supply, 20V, 42A, 850W

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 feature makes easy to manage multiple power supplies in a single system. Additionally to the main output power, 2268-20-42 offers 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.

The Keithley DC 2268-20-42 provides one set of parameters designed to protect the load from damage and another set that protects the supplies themselves. For applications that require outputting voltages only within a narrow range, it supports 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 Keithley 2268-20-42 includes 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. Futhermore, it adds 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 circuitloses 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 any supply’s output to be shut down individually; there’s no need to shut down the whole system.

Features and Specifications of the Keithley 2268-20-42 Power Supply includes:

• Controls up to 30 supplies through a single controller interface
• Compact 1U, half-rack enclosure
• Two auxiliary outputs support driving or signaling external devices
• Isolated analog inputs minimize control line noise
• Built-in LAN, USB, GPIB, RS-232, RS-485 interfaces and analog inputs are all standard
• Constant voltage, constant current, and constant power setting control
• Auto sequence supports internal commands execution, minimizing bus communication time
• Foldback mode with programmable delay shuts down the output to protect sensitive devices
• Numerous safety features protect the load and the supply
• CSA 22.2 No. 61010-1, 60950-1-07 and UL61010-1 and UL60950-1 (2nd ed.). Marked with cCSAus, CE for EMC and European Union Low Voltage Directive
• 850 Watts
• 20 Volts
• 42 Amps   
• Production testing, environmental testing, & accelerated life testing

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