1. The instrument is designed to measure the DC resistance in inductive and non-inductive circuits in the range of 1 µΩ – 30 kΩ, as well as to generate oscillograms of a switching contactor in the high-speed OLTC; it also provides for demagnetization and “Heat Run Test”.

2. MIKO-9A features specialized measurement modes for different configurations of 10 objects, taking into account their specific features. This functionality enables the user to organize the results of measurements, and to improve workflow with the saved information.

3. Depending on the type of object, user can select special measurement modes. For a resistive object, the modes are completely similar to MIKO-8M(A), and for an inductive object, in addition to the two modes MANUAL and AUTO 1ph, user can select AUTO 3ph.

4. Special mode AUTO 3ph allows simultaneous connection to three phases of the transformer and measurement with automatic switching between phases. This mode reduces the amount of reconnecting to/from the object under test.

5. The device features an additional mode of transformer diagnostics, the “Heat Run Test”, which is performed by continuous measurement and periodic result saving of the transformer winding resistance (recalculated to temperature) during the cooling process of the winding, and dependence of the winding temperature on time can be represented in a tabular or graphical form.

6. The instrument is capable of simultaneous resistance measurement across 2 windings, which guarantees fast and accurate DC resistance measurement of power transformers with delta connected secondary windings, when conventional methods do not guarantee reliable results. The instrument takes into account the distribution of magnetic flows in the circuit and indicates onto which phases you should connect the instrument to speed up the measurement process. Furthermore, simultaneous measurement of two windings reduces the total number of measurements from 6 to 3.

7. OLTC in-place check mode allows the user to assess the state of the switching OLTC equipment with current limiting resistors without removing contactor tank cover (DRM – Dynamic Resistance Measurement method).

8. The demagnetization process is compulsory before open-circuit test, short-circuit loss measurement, transformation ratio measurement, etc., so the innovative MIKO-9A has this functionality, and the graph of current behaviour is displayed on the instrument in real-time.

9. MIKO-9A, similar to MIKO-8M(A), has a number of automatic calculation functions for resistance measurement results.