Abstract: An instrument for checking the operational state of IC-circuits, and particularly for checking the operational state of current-conducting IC-circuits on an electronic card or board, the instrument including an electronic circuit which is operative to control and evaluate signals to and from the pins of the IC-circuit, and further including a test clip which is connected to the electronic circuit and which is intended for connection to the pins of an IC-circuit. The invention is characterized in that the electronic circuit includes a microprocessor (10) which is programmed with logic functions intended for one or more IC-circuits, and further includes a sequence logic circuit (14) which is operative to control so-called switches (15) which, via the test clip (4), can be connected to the pins of the IC-circuits in a sequence predetermined for each IC-circuit.