Inverse photoemission remains the main spectroscopic technique to explore the unoccupied electronic states of materials for both solids and adsorbed molecules. It also allows collecting information regarding the k-dependence of the electronic bands above the Fermi level. For spectrometers that consider the use of a diffraction grating as a way of analyzing the photon energy, the energy calibration of the collected spectra is a problem that needs to be addressed. In this paper we present results related to the application of an energy calibration procedure applied to a recently completed inverse photoemission spectrometer.