7792

• UCREFRP Catalog Number: 7792
• Author: Kolz, A. L.
• Title: In-water Electrical Measurements for Evaluating Electrofishing Systems.
• USFW Year: 1993.
• USFW - Doc Type: \
• Copyright Material: NO

14 BIOLOGICAL REPORT 11
Table 2. Distance ratios and ranking for comparing the relative magnitudes of voltage gradient and the
horizontal projections of the electric fields for various electrode configurations when referenced to a
15.2-cm-diameter sphere.
Sphere distance ratio and ranking
50% voltage 80% voltage
Electrode configuration- Distance Rank Distance Rank
Spheres
15.2 cmb 1.00 5 1.00 4
27.7 cm 1.89 11 1.66 10
Cylinders (60-cm length)
0.64 cm 0.47 2 0.76 2
1.27 cm 0.83 3 1.00 3
2.54 cm 1.19 7 1.15 5
5.08 cm 1.70 9 1.35 6
Horizontal loops
0.64 x 36 cm 0.19 1 0.58 1
1.27 x 61 cm 1.15 6 1.42 8
Wisconsin array (60-cm rods, 30.5-cm ring)
four rods at 0.64 cm 1.27 8 1.49 9
six rods at 0.64 cm 1.81 10 1.70 11
four rods at 2.54 cm 1.94 13 1.82 13
six rods at 2.54 cm 2.63 15 2.21 16
Wisconsin array (60-cm rods, 58-cm ring)
four rods at 0.64 cm 0.99 4 1.42 7
four rods at 2.54 cm 1.89 12 1.81 12
six rods at 2.54 cm 2.60 14 2.11 14
Vertical platese
(0.32 cm thick x 122 cm wide)
15.2 cm immersion 3.18 16 2.19 15
30.5 cm immersion 4.52 17 2.82 17
45.7 cm immersion 5.73 18 3.23 18
-Measurements are for diameters unless stated otherwise.
bThe voltage profile of the reference sphere measured 8.4 cm at 50% voltage and 35.7 cm at 80% voltage.
c The voltage profiles for the vertical plates were measured along transects normal to their surface.
d
44
0
50
45
40
35
30
Diameter = 15.2 cm - o
25 = 27.7 cm - x
20
15
10
5
0
0 50 100 150 20
Fig. 12. Voltage profiles for two spheres
having diameters of 15.2 and 27.7 cm.
Distance (centimeters)