Voltage Controlled Current Source CS580— Current source · RS-232 and optical fiber interfaces The Model CS580 Voltage Controlled Current Source creates a new capability for researchers needing ultra-low current noise in a flexible, easy to use instrument. The CS580 is a natural companion product for use with sensitive AC instruments such as lock-in amplifiers, providing a straightforward method for generating precision low-noise currents directly from an AC or DC control voltage. Current is both sourced and sinked with adjustable compliance voltage up to ±50 V, giving full “four-quadrant” performance. The CS580 is a welcome addition to any research lab studying semiconductors and transport phenomena, superconductivity, and nanotechnology, to name just a few. Ultra-Low Noise Design With up to ±50 V compliance voltage, the CS580 can source and sink precision AC and DC currents from 100 fA to 100 mA. The CS580’s ultra-low noise design takes advantage of the best transistors, op-amps, and discrete components available combined with careful high impedance board layout to achieve the highest performance possible. The design even features linear power supplies rather than switching power supplies, so switching frequency interference can never be a problem. · Sources/sinks current from 100 fA to 100 mA · ±50 V compliance voltage · 1 nA/V to 50 mA/V gain · 5 W max power An actively driven guard provides the greatest bandwidth (up to 150 kHz) and lowest possible leakage current. There’s also a buffered monitor output for high impedance voltage measurements. Stanford Research Systems

CS580 Voltage Controlled Current Source CPU Clock Stopping Architecture Ordering Information Front-panel instrument configuration is managed by a microcontroller whose system clock only oscillates during the brief moments needed to change instrument settings. The drive electronics are completely static, with no “scanning” or refresh to generate the slightest interference. Voltage controlled current source Remote computer interface unit Whenever the microcontroller becomes active, the “CPU Activity” indicator illuminates, clearly showing when the digital clock is running. This occurs in response...

CS580 Specifications Remote Interfaces Output Compliance voltage Compliance error DC output resistance Output capacitance Guard output Output power THD Output connector CM voltage CM isolation 0 to 50 V (bipolar) 0.5 % + 0.2 V 1012 Ω (1 nA/V gain) <10 pF (filter off), <50 pF (filter on) –50 V to +50 V, 5 kΩ internal resistance 5 W (four quadrant sourcing/sinking) 0.01 % typ. 3-lug Triax for current output. Banana jacks for load voltage monitoring 250 Vrms (DC to 60 Hz) >1010 Ω, <0.5 nF Input Input range Input impedance Input connector DB-9 connector, 9600 baud Connection to SX199 Optical Interface...