
Metrology: standards 199
(a) (b)
Figure 8.12
A thin-film calculable resistor. (a) The ceramic stick with resistive NiCr layer
and gold contacts. (b) The mounting assembly. Current contacts are provided
by clamps on the stick, the return current path is through the outer screen.
Voltage contacts are given by gold-plated glass disks and an inner screen.
For 1 kΩ resistor, finite-element calculations give a resistance frequency de-
pendence of 5 × 10
−9
at 1 kHz, and a time constant of −120 ps. Courtesy of A.
Bounouh, LNE.
small number of turns; however, all other properties as a standard (in particu-
lar time stability, temperature coefficient, excitation indep ...