Universal Measuring Device (UMD)

The UMD is a universal measuring device for use in Flying Probe Testers for PCBs.

The functional targets are comparable to those of the measuring electronics used in the earlier MANIA Ultim8 testers; however the UMD is completely new developed to achieve highest performance.

The UMD is perfectly driven and controlled by the FourStars-ES ProbeStar Software.

The main functions of the UMD are:

  • Capacitance measurement
  • Resistance measurement, supporting
    • Regular 2 wire continuity measurements.
    • Four wire Kelvin low resistance measurements.
    • Four wire Kelvin component measurements.

The UMD consists of 2 electronic parts:

  • An analog electronic module
  • A digital electronic module

The analog module contains:

  • Power connector for single 24V DC supply
  • Local voltage regulators
  • References
  • Analog components (converters, amplifiers, etc. )
  • Interface to the measuring probes (Hirose PO6 coax connectors)
    max. cable length to contacting probes: 8 m each

The digital module contains:

  • Interface to the controlling PC
  • High speed (Xilinx) FPGA for real time data processing of measurement data
  • Integrated soft cores for smart data handling and process control
  • Diagnosis display

Mechanical Solution:

  • Sandwich solution for easy integration into different tester types
  • Assembled and tested at FourStarsES


  • Capacitance measurements:
    • Resolution: 1 fF   (femto Farad)
    • Max. C: 100nF   (nano Farad)
    • Auto ranging   (5 discrete ranges)
  • 4WK low Resistance:
    • Resolution: 1 µΏ   (micro Ohm)
    • Repeatability: 5 µΏ   (laboratory environment, 5 m cables)
    • Max. R: 35.4 Ώ
    • Auto ranging   (10 discrete ranges)
  • 2 wire regular resistance and 4WK component measurement
    • Resolution: 1 mΏ   (milli Ohm)
    • Max. R: 1 MΏ   (MegOhm)
    • Auto ranging (12 discrete ranges)