Beschreibung

The IET Labs PRS-370 is a Self-Adjusting Programmable Resistance Substituter, just connect an 8.5 digit DMM; Fluke 8508A or the Keysight 3458A to the PRS-370 via the IEEE-488 interface, and the PRS-370 becomes a short-term stable variable standard of resistance.
The PRS-370 instructs the DMM to make a measurement of the source resistance and then automatically fine adjusts the output resistance to achieve the „best“ accuracy to the nominal resistance value, typically better than 10 ppm.
The PRS-370 utilizes both the front and rear binding posts so that the DUT and DMM can be connected at the same time. Once the resistance measurement is complete using the DMM and rear binding posts, the source resistance is switched to the front binding posts. The large graphical color display shows the target resistance, ∆ from nominal, measured resistance from the DMM and measurement uncertainty of the DMM.

PRS-370 patented advantages over traditional decades:
•Self-adjusting improves accuracy to better than 10 ppm replacing individual resistance standards
•Always have the rights resistance standard to calibrate new instruments
•Single button press adjustment, of the internal resistors, saves time of manual trimming or manually entering resistor calibrationvalues

Features:
•Sold with an industry leading 5 year warranty and Manufactured in the USA
•Virtually no maintenance cost , built-in firmware routine allows for the automatic calibration and adjustment of the unit so if it goes out of spec it automatically brings itself back in less than 30 minutes
•Use for RTD applications is straightforward without additional „subtractions“
•Built-in RTD tables for PT100 and PT1000, May be used with 2 or 4 terminals connect ons
•Reduced number of components and resistors for longer term reliability
•Standard GPIB interface for computer control
•For other interfaces such as Ethernet and USB see PRS-330