Regarding electric motor analysis, one of the most powerful functions on the AT7 is the Z-FI Test Mode.

The Z-FI Test Mode is used on all types of AC motors (of any voltage), generators, and transformers. The low voltage tests automatically perform all the Static tests: DF/C, INS, impedance, induction, phase angle, current frequency response (I/F), and calculates a TVS.

The Z-Fi test mode must be used on all medium or high voltage equipment (greater than 1,000V) and should be used on installed equipment with no TVS™ Reference. The reason the Z-Fi test is used on motors with no prior TVS is because you want to determine the current health of the motor. Once you generate a TVS™ value you can begin to trend the data.

In the Z-Fi test mode you do not perform a DYN (dynamic stator & rotor test) because the load or drive is attached to the motor and the test is not practical.

Can you perform a DYN test in the Z-Fi mode? A DYN test is not offered in the Z-Fi test mode. Think of it as a baseline to find out what the condition of the motor is without a reference test. This equipment is usually already installed without having the ability to rotate the motor shaft ( i.e. connected to gearbox, submersible, or a pump).