Oval EL4101 - Instant Flowrate Measurement Setup (FLOW RATE SETTING); Frequency Measurement System; Period Measurement System; Instant Flowrate Measurement Submenu Screen

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E-880TM-3-E
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6.4.5 Instant Flowrate Measurement Setup (FLOW RATE SETTING)
As the parameter values associated with instant flowrate calculation, the type of measurement, low cutoff
frequency, totalizing interruption, smoothing factor, maximum frequency setup, number of measurement
cycles, interpolation setup, and reference oscillator correction are set up here.
Instant flowrate measurement comes in the following two user selectable approaches:
1. Frequency measurement system
2. Period measurement system
（1）Frequency measurement system
In the frequency measurement system, the frequency is calculated by counting the number of arriving
pulses in a predetermined sampling period. In this case, when the input frequency is low, the instability
of measurement may result. Application of a smoothing process can alleviate this instability, but it has a
drawback in that the speed of response suffers.
（2）Period measurement system
In the period measurement system, the period is calculated by counting the number of reference clock
pulses over the time interval between two successive pulses arriving. However, when the interval
between incoming pulses is great, the update time of measurement data may be prolonged.
（3）Instant flowrate measurement submenu screen
At the submenu, move the cursor to the desired setup item with the up and down arrow keys.
At the touch of function key “ENTR”, the screen switches to the item desired for reconfiguration.
① Frequency measurement system
① Instant flowrate measurement type setup (MEASURE. TYPE) p. 68
② Instant flowrate measurement low cutoff freq. setup (LOW-CUT FRQ.) p. 69
③ Instant flowrate measurement totalizing interrupt setup (COUNT STOP) p. 69
④ Instant flowrate measurement smoothing factor setup (SMOOTHING COEF.) p. 69
To the setup screen pointed by the cursor
SET mode main menu screen ⇒ 6.2 SET mode main menu screen p. 36
② Period measurement system
① Instant flowrate measurement type setup (MEASURE. TYPE) p. 68
② Instant flowrate measurement low cutoff freq. setup (LOW-CUT FRQ.) p. 69
③ Instant flowrate measurement totalizing interrupt setup (COUNT STOP) p. 69
④ Instant flowrate measurement smoothing factor setup (SMOOTHING COEF.) p. 69
To the setup screen pointed by the cursor
SET mode main menu screen ⇒ 6.2 SET mode main menu screen p. 36