CCS Standardfunction   DCIS [A]
 

DCIS [A]

MaxSignalAmplitude [V]

IntegrationPeriod [s]

Shuntresistor [Ohm]

Description of Function

Indirect measurement of current by means of integrating DC voltage measurement with AUTO triggering on a defined measurement resistor. This function is always used when a current measurement resistor has to be inserted in a line to the control unit (e.g. UB) for the duration of the measurement. Currents flowing into the control unit register as positive.

Testing Points

The control unit pin at which the current is to be measured is specified as the test point and the reference point.

Parameters

MaxSignalAmplitude

Largest amplitude occurring on the signal. Can be used to establish the measurement range or to select a suppressor circuit.

IntegrationPeriod

Period over which the signal is integrated.
In the event of superimposed interference signals, it is advisable to select a multiple of the interference signal period as the integration period.

Standard value: period duration of supply voltage.

Shuntresistor

For selection of resistor level see MSL Catalogue, Current Measurement Using Series Resistor
The maximum permissible testing impedance is specified as the parameter.

Example

DCIS

1,0.02,100


Test circuit:



Diagram:



tID

IntegrationPeriod

tPS

Period of the interference signal

tN

Period of mains power supply

Figure 3: Quiescent current input of a control unit