Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A resistance bridge based on a cryogenic current comparator achieving
  sub-$10^{-9}$ measurement uncertainties   A new resistance bridge has been built at the Laboratoire national de
m\'etrologie et d'essais (LNE) to improve the ohm realization in the $Syst\`eme
International$ (SI) of units from the quantum Hall effect. We describe the
instrument, the performance of which relies on two synchronized and
noise-filtered current sources, an accurate and stable current divider and a
cryogenic current comparator (CCC) having a low noise of
$\mathrm{80~pA.t/Hz^{1/2}}$. The uncertainty budget for the measurement of the
100 $\Omega/(R_\mathrm{K}/2)$ ratio, where $R_\mathrm{K}$ is the von Klitzing
constant, amounts to a few parts in $10^{10}$ only.

14
The categories of this paper are: math-ph
9
The categories of this paper are: nlin
1
The categories of this paper are: cs
16
The categories of this paper are: stat
29
The categories of this paper are: funct-an
27
The categories of this paper are: comp-gas
24
The categories of this paper are: dg-ga
36
The categories of this paper are: cmp-lg
5
The categories of this paper are: gr-qc
4
The categories of this paper are: cond-mat
6
The categories of this paper are: astro-ph
12
The categories of this paper are: nucl-th
25
The categories of this paper are: patt-sol
31
The categories of this paper are: ao-sci
10
The categories of this paper are: q-bio
23
The categories of this paper are: solv-int