Epson 214D-1 user manual Filtering

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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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Contents USER’S Manual HP289 HFC Warranty Contents HP289 Introduction Model 214D- a Model Number DesignationIntroduction 2A Introduction 2B This page intentionally left blank HP289 General SpecificationPulse Output Operation Front Panel Operation Setting the Batch QuantityStarting a Batch ResettingStopping Displayed InformationAccumulated Total Limit on Batch SizeBatch Operations Page Control Relays Flow Alarm Signal TimeoutEnd-of-Batch End-of-Batch SignalAuto Restart Automatic Overrun Compensation Calculation of Rate and Total Frequency Input = fxHFiltering 103 For Example Total ConversionOutput Pulse and Flow Alarm Page RS232/422/485 Interface Option OptionsHardware RS422 Interface HP289 Multipoint CommunicationRS485 Interface HP289 Printer Communication ProtocolComputer RUN ConfigurationPage Base Configuring the Setup ParametersStep Display Description Text Entering the Batch Parameters Signal Timeout in seconds Setting to Disables this featureDis EOB Date Configuring the OptionsEcho Checking the Input Signal Input Circuit for the 214D Series Input CircuitsGeneral Specification Switch SettingsInput Circuits Frequency Input Circuit HP289 Page Page Remote Key Switches General InstallationRC Networks for Interference Suppression Terminal Relay Option & Switches Terminal Wiring DesignationsTerminalDescription Terminal RS232/422/485 OptionTrouble Shooting Counting erratically No end of batch, pulse output, or flow alarmInstrument acting erratically Input Errors Error CodesOutput Errors Configuration ErrorsFront Panel IndexTerminal Wiring

214D-1 specifications

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