The demand on researchers, designers, and evaluation engineers for better device characterization has generated a widespread need for programmable, low-level DC sources. And, as an experienced manufacturer of automatic wafer measuring equipment, Keithley knows the importance to the user of instrument compatibility and ease of system integration. The 220 programmable current source finds major applications in component characterization, materials research, and ATE systems. The 220 incorporates a 100-step, programmable memory buffer, useful in applications where either a fixed number of outputs is repeated or a complex waveform of discrete steps must be generated.