# Determination Of Static Acceleration Error Constants

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**Determination of static acceleration error constants**

*Fig: 1 Unity-feedback control system*

*Fig: 2 Log-magnitude curve of a type 2 system*

Consider the unity feedback control system shown in Figure 1. Figure 2 shows an example of the log-magnitude plot of a type 2 system. The intersection of the initial -40-dB/decade segment (or its extension) with the ω = 1 line has the magnitude of 20 log K_{a}. Since at low frequencies

The frequency ω_{a} at the intersection of the initial -40-dB/decade segment (or its extension) with the 0-dB line gives the square root of K_{a} numerically. This can be seen from the following: