  Inelastic neutron scattering is used to study the finite-temperature scaling
behavior of the local dynamic structure factor in the quasi-one-dimensional
quantum antiferromagnet NTENP
($\text{Ni(N,N'-bis(3-aminopropyl)propane-1,3-diamine)(}\mu\text{-NO}_2\text{)ClO}_4$),
at its field-induced Ising quantum critical point. The validity and the
limitations of the theoretically predicted scaling relations are tested.
