Instrument test arrangement

An instrument test arrangement, in particular for medical instruments for argon plasma coagulation, comprising:

• an electrode arrangement configured to test a medical instrument, the electrode arrangement comprising at least one spark striking test electrode, which is connected electrically to a neutral conductor of a neutral conductor cable or of a device,
• wherein the neutral conductor cable or the device comprises two neutral conductors, which are insulated from one another and are connected to two partial electrodes of a neutral electrode arrangement, wherein the partial electrodes are connected to a split circuit which serves the purpose of measuring the electrical resistance between the two partial electrodes to detect whether the partial electrodes comprise sufficient electrical contact to the patient, and
• wherein the spark striking test electrode couples to the neutral conductors with the same coupling impedances or with coupling impedances that are at most slightly different, so that when HF energy is applied to the spark striking test electrode this does not result in currents in the neutral conductors which are different to the extent that the split circuit erroneously indicates a lack of contact of the partial electrodes to the body of the patient.