Measurement System Correction

Using this option will correct your measurements for the influence of the measurement system. But in order to do this, your measurement system first has to be measured. The procedure for this is described in the FAQ. Measurement System Correction is not recommended if you measure without using synchronization loop-back because a linear phase shift is added since the start of the impulse response may not be correctly determined. Also the magnitude frequency response may in some cases be incorrect because of this shift of the impulse response.

If you measure using synchronization loop-back, you might experience a small tail at the very end of the impulse response. This is a result of the correction filtering procedure. If this tail is more than –50 dB below the maximum of the impulse response, it should be nothing to worry about for most applications.

When the Measurement System Correction is turned on, the relative amplification will be measured, even if no level calibration has been performed. If the amplification of the system you are measuring has increased 5 dB after you performed the reference measurement, the peak of the impulse response will be at 5 dB. The linear amplification may be displayed by plotting for example the first part (it is given by the maximum) of the impulse response using linear axis. To plot the amplification in dB, do the same using logarithmic x-axis, or plot the magnitude frequency response.