PASCO PK-9023 EQUIPOTENTIAL AND FIELD MAPPER - Manual (Page 5)

scientific 1
012-04346B
Introduction
10101 Foothills Blvd.
• P . O. Box 61901
1 • Roseville, CA
95661-901 1 USA
Phone (916) 786-3800 •
FAX (916) 786-8905
• TWX 910-383-
2040
scientific
Instructional Manual and
Experiment Guide for the PASCO scientific Model
PK-9023
FIELD MAPPER
101 01 F ooth ills B lvd. • P . O. Box 619 011 • Ro sevi lle, C A 9 566 1-90 11 U SA Pho ne ( 916 ) 786 -380 0 • FAX (91 6) 7 86-8 905 • T WX 910 -383 -204 0 scie ntific
Instru ctio nal M anu al a nd Exp erim ent G uide for th e PAS CO scie ntific Mo del PK- 902 3 FIELD MAPPER
- +
The PASCO scientific MODEL PK-9023 Field Mapper
consists of two basic elements. The first is a carbon impreg-
nated paper in the resistance range of 5 K
Ω
to 20 K
Ω
per
square. This paper forms the conducting medium or space
between the electrodes. The second element is a conductive
ink dispensed from a pen. The ink is produced from silver
particles in a suspension liquid. As the ink dries, the silver
flakes settle on top of each other forming a conductive path,
(or conductive ink electrodes). The resistance of the ink is
between .03 and .05
Ω
/cm for a 1 mm wide line.
Because the paper has a finite resistance, a current must flow
through it to produce a potential difference. This current is
supplied by the conductive ink electrodes which causes a
potential drop to occur across the paths. Because of the
large difference between the ink’s resistance and the
resistance of the paper, this potential drop is less than 1% of
that produced across the paper. Therefore, for all practical
purposes the potential drop across the electrodes may be
considered negligible.
Equipment
Equipotential and Field Lines
It would be desirable that the potential measuring instrument
have an infinite impedance. An electrometer such as the
PASCO Model ES-9054B would be optimal, however, a
standard electronic voltmeter such as PASCO's SE-9589
Handheld Digital Multimeter with a 10 M
Ω
(or higher) input
impedance is sufficient. Since this impedance is at least 100
times greater than that of the paper, the greatest distortion of
the field which can be produced by the voltmeter is approxi-
mately 1%.
The PK-9023 Field Mapper includes:
• 100 sheets of conductive paper with 23 x 30 cm grid
• a silver conductive ink pen for approximately 200 ft of
continuous line
• a corkboard working surface
• 10 push pins for attaching the paper to the board
• 3 wires for connecting the conductive paths
• a circle template for drawing the conductive paths.
• a large plastic tray for storing the paper and other
supplies
• Instruction manual and experiment guide.
The following supplies can be ordered separately
from PASCO scientific
Conductive ink pen Model No. PK-9031B
100 sheets of 23 x 30 cm conductive paper with cm grid
Model No. PK-9025A
100 sheets of 30 x 46 cm conductive paper (without grid)
Model No. PK-9026A