Theory Of Operation; B.5 Theory Of Operation - Fluke 35040 Operator's Manual

B.5 Theory Of Operation

Basic Operating Equations
Quantity Description
Q Timed Charge
Timed
Q Predicted
Timed_Predicted
Timed Charge
Leakage Measurements
Leakage measurements (Q
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.
= − −
Q Q [C] Q [C]
Timed 2 1
= ×
Dose Q [C] ICCF
Timed Timed
Q represents the next sample of charge at time T
1
the interpolated charge at time T
within the range: T < T
1 2
Predicted Timed Charge and Dose
This measurement extrapolates the timed charge (Q
accumulated at completion of the timer interval (i.e., TimerIntervalSetting) based on the rate of charge
delivery.
Q [C]
Timed
=
Q
Timed_Pred icted
T [s]
Elapsed
=
Dose Q
Timed_Pred icted Timed_Pred
At the conclusion of the timer interval (i.e., T
charge and dose are equal to the predicted timed charge and dose, respectively.
Units
C
C
I and T
Offset, Leakage Offset
( (
× −
I [A] T [s] T [s]
Leakage 2 1
×
[Units/C] ADCF
, where T is an integral number of seconds that is restricted to times
2 2
≤ (T
+ Timer Interval Setting).
1
×
TimerInter valSetting [s]
×
[C] ICCF [Units/C]
icted
Elapsed
Comments
The electrical charge delivered during the timer
interval.
The total amount of timed charge that should be
accumulated at the completion of the timer
interval, based on the observed delivery rate.
) are only applicable when automatic leakage
) )
following the activation of the timer. Q
1
) at the elapsed time (T
Timed
×
ADCF
equals the TimerIntervalSetting), the predicted timed
Appendix

Theory of Operation

corresponds to
2
) that should be
Elapsed
B-11
B