228A Keithley Programmable Voltage / Current Source with Fixed Rack-Mount

The Keithley Model 228 Voltage/Current Source is both a constant voltage and constant current source with front panel and IEEE operation. The Model 228 can be used as a constant voltage source or a constant current source. It has four quadrant operation. This means that the voltage or current sources can operate as a source or a sink in either positive or negative polarities. Full power capability of 100W may be obtained in any quadrant.

Parameter entry is done in one of two ways. Either using the data keypad to enter the desired value into the display or using the display modify function. The display modify function allows the user to modify either display by modify function. The display modify function allows the user to modify either display by selecting a digit of the displa and incrementing or decrementing that digit with the appropriate keys. With the carry, borrow and autorepeat capability, front panel operation is flexible and easy to program. The user selects from the range with the decimal point.

The Model 228 has a 100 point data memory that allows the user to store up to 100 unique values of current, voltage and dwell time for future use. Once a particular level is stored in the data memory, the user need not reprogram the level.

The output terminals are located on a quick disconnect board that inserts into the the rear panel of the mainframe. The output is disconnected from the quick disconnect board when it is removed from the mainframe.