Operation 17

3.3.2Filtering

Frequency fluctuations caused by pulsating flow through a flowmeter, often makes the Rate impossible to read with any precision.

The Batch Controller has a digital filter which will average out these fluctuations and enable the Rate to be read to four digit accuracy. The degree of filtering is fully configurable which means that highly accurate and stable readings can be obtained without excessive lag.

The diagram below shows a pulsating signal input together with the effect of filtering.

As a guideline to the degree of filtering to be used, the following table shows the response to a step change in input. The value, A, is the filter constant which is set during the configuration process. The times for the display value to reach 90% and 99% of full swing are given in seconds for different values of A.

HP289

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Epson 214D-1 user manual Filtering
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214D-1 specifications

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