Tesa Electronic Probes
(Most of the following text is taken from the Brown & Sharpe Metrology Catalog. The technical prose couldn't possibly be improved upon—although we did take one or two editorial liberties. Our compliments to the anonymous author.)
Key components in any electronic linear measuring system, Tesa inductive probes detect the slightest variation in size with absolute reliability. Whether fixed to a simple measuring support or integrated by the dozen into a complex installation, they record dimensions with unvarying precision. Rugged and virtually insensitive to temperature variation and electromagnetic interference, Tesa inductive probes are compact, can be used in any position and are easily brought into contact with the work to be checked.
These standard half-bridge probes are compatible with Brown & Sharpe and Tesa amplifiers. Most are also compatible with earlier Brown & Sharpe series 960, 990 and 1020 amplifiers.
All Tesa electronic probes (value sensors) work on the inductive principle with mechanical contact of the work-piece. They are fitted with a coil system inducing an alternating output voltage that depends on the position of the ferromagnetic core. With a symmetric position, i.e. at electrical zero, no voltage is impressed. A move of the core, which may be attached to the measuring bolt while the measurand is being taken, leads to a change in the inductance. This change generates a signal that is amplified and rectified before being displayed and further output. Depending on the instrument type, the analog signal will be shown on a voltmeter or a numerical display after its digital transformation.
Unambiguous assessment of the measurand (at bolt position) to the signal (displayed value) is the main characteristic of the analog value acquisition. One of its distinct advantages is that the value primarily displayed will be reproduced in the event of a power cut (switch-off or power failure).
About Standard Tesa half-bridge probes designed for use with Tesa measuring instruments.
Tesa 8 mm diameter axial probes
These electronic probes are imported from Switzerland. They are usually in stock. No test data comes with the probe. There is a certificate that guarantees conformance to the above listed specs.