28129 Parallax Inc, 28129 Datasheet - Page 161
28129
Manufacturer Part Number
28129
Description
TEXT BASIC ANALOG & DIGITAL
Manufacturer
Parallax Inc
Type
Programmingr
Datasheet
1.28129.pdf
(176 pages)
Specifications of 28129
Style
Book
Title
Basic Analog and Digital
Contents
Basic Analog and Digital Text
Product
Microcontroller Accessories
Lead Free Status / RoHS Status
Not applicable / Not applicable
- Current page: 161 of 176
- Download datasheet (3Mb)
Using properties of logarithms, this simplifies to:
Rearranging again gives us an equality in terms of R and C and t:
If R is the unknown value, divide both sides by C. If C is the unknown value, divide both
sides by R. The resulting two equations are useful for determining an unknown R if C is
known, or visa versa.
Try a few different resistor and capacitor combinations from the Analog and Digital Parts
Kit. Remember that capacitor values can vary as much as 20% from their nominal
(named) value. This will in turn cause error in your measured values. However, if a
resistor with a very low tolerance, such as 1% is available, the measurements of
capacitance can be pretty accurate. Once the capacitor has been calibrated, then it's
possible to take accurate resistance measurements with the RC circuit as well
R
R
R
×
=
×
t
C
C
C
=
×
=
ln
ln
ln
t
V
V
V
V
V
V
t
P
P
P
dd
dd
dd
15
15
15
or
C
=
R
×
ln
t
V
V
P
dd
15
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