28128 Parallax Inc, 28128 Datasheet - Page 161
28128
Manufacturer Part Number
28128
Description
KIT BASIC ANALOG/DIGI PARTS ONLY
Manufacturer
Parallax Inc
Datasheet
1.28129.pdf
(176 pages)
Specifications of 28128
Accessory Type
ADC, DAC
Product
Microcontroller Accessories
For Use With/related Products
BASIC Stamp® 2 and Board of Education
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
- 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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