The Signatone QuadPro Process Development Resistivity System is available in both manual and automatic 8" and 12" systems. The manual system includes a ball bearing stage and can be upgraded at a later time to add auto-stepping capability. The automatic systems are motorized and can automatically step through 9, 25, 49, or 121 test points on wafers of size 100 mm, 125 mm, 150 mm, 200 mm, or 300mm.
The systems use Four-Point Probes with a state of the art current source and electronic DVM combined with a dual configuration test procedure and test integration to obtain an accuracy of better than 1% over the resistivity range from 1 milli-ohm to 2 Meg-ohms per square. The accuracy and calibration are NIST traceable. The automatic system is fully integrated and operates under Windows 95/98 with a Pentium based controller.
The Signatone Pro4 series provides simple answers to sheet and bulk resistivity measurements. Since 1968, Signatone has offered an inline Four-Point Probing solution. To make the measurements, the user lowers the Four-Point Probe head onto the sample then selects the test button in the software. The computer automatically controls the Keithley 2400 series and steps through a number of current settings to find the ideal current for accurate readings.
Signatone manufactures a wide range of resistivity test equipment including an economical four point probe mounting stand and four point probe heads.