Femto
Capacitance Meter:
This meter measures into the
low femtofarad area.
Measuring in the femto area
allows the smallest
capacitors to be measured
with precision. Such
capacitors are commonly used
to compensate for input and
stray capacitance in
amplifiers.
Measure open
circuited cables using a
multimeter:
09/26/2002 EDN - Design
Ideas / You can use a
multimeter with
capacitance-measurement
capability to measure the
length of wire or cable to
an open circuit. The
capacitance of a pair of
wires (or a wire to a
shield) is directly
proportional to the length
of the wire. If you know th.
Sense Small
Capacitance Changes Over A
Wide Range
: 09/20/04
Electronic Design - Design
Briefs / With this simple
circuit connected to a
serial port, small
capacitance deviations on
the order of 0.01 pF can be
easily sensed over a wide
range of several hundred
picofarads (see the figure
Solve low
frequency cutoff problems in
capacitive sensors:
11/28/2002 EDN - Design
Ideas / One of the
first problems a
capacitive-sensor analog
designer must face is the
low-frequency cutoff.
Theoretically, you must
fulfill just one simple
requirement: a sufficiently
large input resistance of
the preamplifier's first
stage. In practice, however,
many problems lurk behind
the seemingly
straightforward design
rules..
