Excitation Current
The excitation current is the current commanded to acquire the tuning.
When the Excitation Configuration Mode is set to Friction Test, the Tuner will begin with a friction test to determine how much excitation is needed to acquire accurate data.
Sometimes systems will require adjustment of this excitation value to get better measurements - less noise and better defined resonances.
Increasing the excitation current reduces the errors and leads to cleaner plots.
To manually set an excitation level, change the Excitation Mode to “User Defined”.
The plots below demonstrate the improvement when going from 0.125 Amps up to 1.000 Amp. As the current is increased, the noise is reduced (smoother lines) and the resonance peaks are more well defined providing more accurate amplitude and frequency values.
Note: Adding current will make the system audibly louder and may cause current and / or voltage saturation.
