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This article describes a circuit arrangement for determining the value of a capacitor utilizing the combination of a multivibrator, a microprocessor and ROM look up tables.
English (United States)
This text was extracted from a PDF file.
This is the abbreviated version, containing approximately
96% of the total text.
Page 1 of 1
Microprocessor Based Capacitance Meter
This article describes a circuit arrangement for determining the value of a
capacitor utilizing the combination of a multivibrator, a microprocessor and ROM
look up tables.
Most microprocessor based capacitance meters are built around an A/D
converter. This A/D converter samples the capacitor's discharge curve and then
computes the value of the capacitor according to the typical capacitance
discharge curve shown in Fig. 1. A complex algorithm is required to perform this
function. Presented herein is a circuit arrangement for determining the value of a
capacitor without the need of using an A/D converter. This requires a much
simpler algorithm to compute capacitor values.
A block diagram illustrating this design of capacitance meter is shown in Fig. 2. The capacitor to be tested is attached to the precision monostable
multivibrator. The microprocessor then selects a precision resistor from the
resistor bank. This resistor together with the capacitor being tested will generate
a pulse at the output of the multivibrator. This pulse is then sampled by the
microprocessor to determine its length. This pulse length is cross-referenced
with a table stored in ROM. This will generate the value of the capacitor. If the
value is not within the range of the table for the given resistor, another resistor
from the resistor bank is selected until a value is found in the table, thus
providing autoranging. When a value is determined, the valu...