Schüller, A. Illemann, J. Kapsch, R.-P. Makowski, C. Renner, F. JACoW Geneva, Switzerland 978-3-95450-177-9 10.18429/JACoW-IBIC2016-WEPG37 English 709-712 WEPG37 linac electron radiation vacuum monitoring Contribution to a conference proceedings 2017 2017-02 http://dx.doi.org/10.18429/JACoW-IBIC2016-WEPG37 http://jacow.org/ibic2016/papers/wepg37.pdf This work presents a description of measuring devices and procedures in order to enable the nondestructive (non-intercepting) absolute measurement of the charge of individual beam pulses (macro-pulses) from an electron linear accelerator with high accuracy, i.e. with a measurement uncertainty <0.1%. In particular, we demonstrate the readout and calibration of a Bergoz integrating current transformer which is frequently applied at many different types of accelerators as a beam intensity monitor. The current transformer signal is calibrated against a custom-made compact Faraday cup with a high degree of collection efficiency for electron beams in the energy range of 6 MeV to 50 MeV (99.2 % at 27 MeV), which is well known from measurements and Monte Carlo calculations.