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| Appendix | B | |
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| Theory of Operation | ||
| B.5 Theory Of Operation |
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| Basic Operating Equations |
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| Quantity | Description | Units | Comments |
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| QTimed | Timed Charge | C | The electrical charge delivered during the timer |
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| interval. |
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| QTimed_Predicted | Predicted | C | The total amount of timed charge that should be |
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| Timed Charge |
| accumulated at the completion of the timer |
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| interval, based on the observed delivery rate. |
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Leakage Measurements
Leakage measurements (QOffset, ILeakage and TOffset) are only applicable when automatic leakage compensation is enabled.
Timed Charge and Dose
This measurement accumulates charge only while the elapsed time is less than or equal to the timer interval setting. The displayed value is held following the completion of the timer interval.
QTimed = Q2[C] − Q1 [C] − (ILeakage [A] × (T 2 [s] − T 1 [s]))
DoseTimed = QTimed [C] × ICCF [Units/C] × ADCF
Q1 represents the next sample of charge at time T1 following the activation of the timer. Q2 corresponds to the interpolated charge at time T2, where T2 is an integral number of seconds that is restricted to times within the range: T1 < T2 ≤ (T1 + Timer Interval Setting).
Predicted Timed Charge and Dose
This measurement extrapolates the timed charge (QTimed) at the elapsed time (TElapsed) that should be accumulated at completion of the timer interval (i.e., TimerIntervalSetting) based on the rate of charge delivery.
= QTimed[C] ×
QTimed_Predicted TElapsed[s] TimerIntervalSetting[s]
DoseTimed_Predicted = QTimed_Predicted [C] × ICCF [Units/C] × ADCF
At the conclusion of the timer interval (i.e., TElapsed equals the TimerIntervalSetting), the predicted timed charge and dose are equal to the predicted timed charge and dose, respectively.
