By Shakil Awan
-From authors with a mixed 60+ years of expertise in electric measurements conducted in nationwide size Laboratories-Offers tips and top perform in electric measurements acceptable to any required accuracy point Contents: the idea that
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Additional info for Coaxial Electrical Circuits for Interference-Free Measurements (Iet Electrical Measurement)
Any capacitive interference such as the interfering source C can be conveyed to a screen that is symmetrical with respect to the conductor pair and will then also be balanced out. 6 are a counsel of perfection. 31 Balancing a conductor-pair circuit systems described in these sections is very worthwhile, if not mandatory. An example of the compulsory use of these techniques is the automated operation of measuring systems involving a SQUID [1,3]. But these specialised transformers and supplies are not yet readily available.
In addition to this coupling mode there can be significant contributions from modes (i) and (ii), that is, via stray capacitance and magnetic flux linkage. 13. A branch connection makes it easier to also eliminate capacitance coupling with a shield, as in (i), and flux coupling, as in (ii). 6. 13 A branch connection to eliminate common-conductor coupling As an example of eliminating common-conductor coupling, consider simple operational amplifier circuits. These could well be the first stage of matching and amplification after a sensor before conversion to a digital signal.
Permanent or temporary connections around the circuit need special attention. Switch contacts used for this kind of work should be made from special alloys or silver- or gold-plated pure copper. If a rubbing action accompanies making a contact, several seconds may be needed for induced thermoelectric emfs to die away. Soft-soldered joints need careful treatment. Ordinary soft solder as used for electrical connections has a high thermoelectric emf with respect to copper. It can nevertheless be used if the copper conductors to be joined are first brought into intimate contact by applying pressure while being soldered together.
Coaxial Electrical Circuits for Interference-Free Measurements (Iet Electrical Measurement) by Shakil Awan