Jandel ResTest Test Unit

The Jandel ResTest Test Unit is a constant current source and digital voltmeter with colour screen, supplying constant currents between 1uA and 10mA, and measuring voltages from 0.04mV to 4000mV.

The ResTest has a range of 10 milliohm/square to 1 Megohms/square, or 10 milliohm.cm to 10000 ohm.cm. Measurements outside this range are possible depending on sample type and possible reduced accuracy.

Readings are displayed directly in mV, Sheet resistance and Volume Resistivity and can be saved on board or directly to memory stick.

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    Product FAQs

    Who is Jandel Engineering Ltd?
    Jandel Engineering was established in 1967. Prior to founding Jandel Engineering, Managing Director John Clark worked for A & M Fell in London. It was at this company that the first commercially available four point probe head, the 'Fell' probe head, was designed by John Clark and a colleague. Since this original design many improvements have been introduced.
    Who makes Jandel's probes?
    Experts! All probe heads are made by experienced engineers with a minimum of five years intensive training. Some of our probe builders can boast over 20 years experience.
    What are 'ohms per square'?
    The unit of measurement when measuring the resistance of a thin film of a material using the four point probe technique. It is equal to the resistance between two electrodes on opposite sides of a theoretical square. The size of the square is unimportant and so strictly the measurement is in ohms, however ohms/square distinguishes measurement of a thin sheet from measurement of, for instance, a wire.
    What are 'ohms-centimetre'?
    The unit of measurement when measuring the bulk or volume resistivity of thick or homogeneous materials such as bare silicon wafers or silicon ingots, using the four point probe technique.