Krohn-Hite Corporation DC Source/Calibrator Model 523

Our DC Source/Calibrators are designed for a typical applications such as the design, check and calibration of high speed, high resolution A/D converters; design and certification of high speed data logging and process control systems; calibration of digital voltmeters and multimeters; as an “IMBEDDED STANDARD” and/or simulator; design, testing, simulation and certification of thermocouples, strain gages and transducer instrumentation. GENERAL DESCRIPTION The Krohn-Hite Model 523 Precision DC Source is a h ighly stable and repeatable dc voltage source and dc curr ent source providing N.I.S.T. traceable voltages and currents for use in production, calibration labs, QA and QC departments , design labs, or any place where an accurate voltage and cu rrent source is needed. Using Krohn-Hite’s state-of-the-art reference, the 523 provides accurate and stable voltages from ±10nVdc to ±110.99999Vdc to within ±4ppm for 90 days (±8ppm fo r 1 year), and precise currents from ±10nA to ±110.9999 9mA to within ±8ppm for 90 days (±16ppm for 1 year). It is an extremely quiet source with <7μVrms of noise measur ed over a 10Hz to 100kHz bandwidth (<2μVrms 0.1Hz to 10Hz). The 523 features a user friendly 7½ digit display a nd a membrane keyboard entry of all settings. Output set tings can be modified using a plus/minus delta function, mult iply/divide function and cursor control keys that allow placing a curse on any digit to increment or decrement its value. Outp ut 2-wire, 4-wire and chassis grounding are accomplished with one keystroke or over the GPIB interface bus. A crowbar function places the output in a safe mode when desired. The 523 output can be set to 0 volts, allowing the output sense to maintain a true 4-wire low impedance zero output. It is also q uickly forced to zero before a range change to prevent any "surprise voltages" from appearing. An AUTO ZERO OFFSET CALIBRATION (AZOC) returns any thermally generated offsets to within specified limits and is accessible via the front panel or over the GPIB interface bus. The unit is designed for a "Covers On Calibrat ion” using the KH523CAL Test and Calibration Software Program. With the KH523CAL program and either an HP3458 or Fluke 8508A Digital Voltmeter, unattended calibrations ca n be made in approximately 15 minutes. The 523 provides for the storage of up to 31 output settings that can be recalled at any time. Internal operatin g temperature, serial number, last calibration date a nd firmware version can all be called to the display for quick access when needed. Error messages are displayed when incorrect or out- of-range entries are made.