A method of performing multiple test measurements on a utility power device, comprising: providing an apparatus having at least a processor, a common high voltage source, and at least a first and a second lead selectively coupled to the common high voltage source for sending and receiving high voltage signals, wherein the apparatus and the utility power device both share a common ground; selectively sending a first high voltage signal via the first lead of the apparatus to a first terminal of the utility power device; measuring respective electrical parameters of a first corresponding signal returned via the second lead of the apparatus from a second terminal of the electrical utility power device; characterised in that the method further comprises while the corresponding first lead and the second lead of the apparatus remain electrically coupled to the corresponding first and the second terminal of the utility power device, selectively sending a second high voltage signal via the second lead of the apparatus to the second terminal of the electrical utility power device, and measuring respective electrical parameters of a second corresponding signal returned via the first lead of the apparatus from the first terminal of the utility power device wherein the selectively sending of the first high voltage signal and the second high voltage signal and the measuring of the respective electrical parameters corresponding to the first and second return signals includes internally switching a corresponding first and second switching network, each switching network having a plurality of high voltage relays and at least one switch facilitating the selective switching. providing an apparatus having at least a processor, a common high voltage source, and at least a first and a second lead selectively coupled to the common high voltage source for sending and receiving high voltage signals, wherein the apparatus and the utility power device both share a common ground; selectively sending a first high voltage signal via the first lead of the apparatus to a first terminal of the utility power device; measuring respective electrical parameters of a first corresponding signal returned via the second lead of the apparatus from a second terminal of the electrical utility power device; characterised in that the method further comprises while the corresponding first lead and the second lead of the apparatus remain electrically coupled to the corresponding first and the second terminal of the utility power device, selectively sending a second high voltage signal via the second lead of the apparatus to the second terminal of the electrical utility power device, and measuring respective electrical parameters of a second corresponding signal returned via the first lead of the apparatus from the first terminal of the utility power device wherein the selectively sending of the first high voltage signal and the second high voltage signal and the measuring of the respective electrical parameters corresponding to the first and second return signals includes internally switching a corresponding first and second switching network, each switching network having a plurality of high voltage relays and at least one switch facilitating the selective switching.