How to get a pure bias value with zero-order holder

fire
Tue, 09 Aug 2022 06:57:24 +0000
PLECS

A bias value 2 is given to sinwave, T is 0.5, and i want to get it using ZOH with a sample time 0.25, but the error is bigger with time,why? and how to get the pure bias value?

the simple example is attached.

1.plecs (4.84 KB)

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