  We analyzed how entanglement harvesting is affected by the performance of a
measurement on the quantum field. The measurement on the field is modelled as
the coupling of a particle detector to the field, followed by a projective
measurement performed on the detector. In our analysis, we considered different
arrangements for two detectors harvesting entanglement and an ancillary
detector used to perform a measurement. We found different regimes for how
performing measurements on the field affects the entanglement harvested,
depending on the initial and final states of the detector used to measure the
field, as well as its coupling strength. We identified the regimes where it is
possible to measure the field during the preparation of entanglement harvesting
protocols without significantly interfering in the entanglement harvested. We
also identify in what regimes the field measurement can degrade or slightly
enhance the ability of particle detectors to harvest entanglement.
