Silver Plated Tungsten and Tungsten-Rhenium Probe Needles
Description
Material DC Resistivity
Note: The resistance values were calculated using Ohm’s Law for parallel resistors. There was a statistically significant correlation between the “theoretical values” in the table and direct measurements from the various probe needle diameters.
Tungsten
Needles
Tungsten-Rhenium Needles
Plated Nickel
Needles
Plated Silver
Needles
5.5 to 5.9 µΩ−cm
9.2 to 10.1 µΩ−cm
7 to 40 µΩ−cm
1.6 to 3.2 µΩ−cm
DC Resistance and Current Carrying Capacity
Note: The current carrying capacity was determined based on the power dissipated by heat.
Plated Probe
(200-µin thickness
on a 2.0 inch long
probe needle)
Nominal Nickel
Plated Probe
Resistance
(mΩ)
Nominal Silver
Plated Probe
Resistance
(mΩ)
% Resistance
Reduction
% Ampacity
Increase
Tungsten
5
6
7
229.4
158.9
114.8
148.7
109.6
83.4
35.2
30.9
27.3
19.5
16.9
14.8
Tungsten-Rhenium
5
6
7
376.1
260.0
188.7
198.9
149.9
116.6
47.1
42.3
38.2
27.3
24.1
21.4