Below we will offer a new improved compensated C4D (Capacitively Coupled Contactless Conductivity Compensated Detection) electronic arrangement that excludes the stray capacitance
leakage effect by introducing the parallel idle channel with inversed AC input signal.
2 consists of a three-part coaxial capacitive sensor in which the middle one is acting as the main sensing probe and the other two capacitors considered as the guard rings in order to reduce the stray capacitance
effect and the source of errors in measurements (it must be mentioned that such design is more useful for the case of small capacitance change measurements).
A flooded ground plane does not prevent this because stray capacitance
will still be formed between the electrodes/traces and the ground plane since they are also at different DC potentials.
Global stray capacitance
also computed by Q3D Extractor.
Since the stray capacitance
is negligible compared to the term [I.
The common arm incorporates a low pass structure to absorb the cumulative stray capacitance
from the radial portion of the switch matrix.
was minimized by using a preamplifier that was located only 60 cm from the pickup coil (the primary reason it was not even closer was due to its magnetic housing).
A separate shield electrode can be used to reduce stray capacitance
, providing more reliable operation in the presence of a water film or droplets.
In order to estimate the effect of the stray capacitance
on the output pulse of the generator without compensation circuit the [C.
The capacitance of the feedback element should be at least 10 pF to avoid errors due to stray capacitance
and noise gain.
If the probe has been well constructed, stray capacitance
can be as low as 0.
The two models differ by what is presumed to be the dominant sources of loss and stray capacitance