Purpose: Create a new PwrRamp signal object.


Signal = PWRRAMP.New (Tag
Tag STRING Tag for object identification.
Pstat PSTAT Pstat is an object with a PSTAT license.
InitialValue REAL The initial value to be set by the signal object. The units of this value depend upon the mode selected. The units are either volts, amperes, ohms, or watts.
FinalValue REAL The final value of the signal ramp. The units of this value depend upon the mode selected.
ScanRate REAL The scan rate, entered in units/second, where units is defined by the mode of the signal.
LimitValue REAL

This value is used to specify a limit used in calculating the signal. It is not used for PWR_MODE_CURRENT_DISCHARGE or PWR_MODE_CURRENT_CHARGE. Enter 0.0.

For PWR_MODE_VOLTAGE it is the maximum current to be encountered, entered in amperes.

For PWR_MODE_POWER it is the minimum voltage to be encountered, entered in volts.

For PWR_MODE_RESISTANCE it is the maximum voltage to be encountered, entered in volts.


This is the gain used during the feedback loop. Leave this at the default value.



This is the percentage above/below the nominal value, used during a perturbation. The nominal value is the current that is being applied by the signal. It is entered as a decimal, where 1.0 = 100%. Leave this at the default value.


MaxStep REAL

This is the percentage of full-scale that is used to limit the maximum step in current during the feedback loop. The I/E current range determines the full-scale value. The percentage is entered as a decimal, where 1.0 = 100% of the scale. Leave this at the default value.


SamplePeriod REAL This is the sample period, entered in seconds. This signal performs a feedback loop. The TimerRes determines the speed of the timer. The SamplePeriod determines the timing of output points.
PerturbationRate REAL

This is the time, entered in seconds, between perturbations of the signal. A perturbation is an increase followed by a matching decrease in the applied signal value. This perturbation allows the signal to determine the response of the cell so that the feedback loop can work properly.

Perturbations are only necessary in feedback modes. These modes are PWR_MODE_RESISTANCE, PWR_MODE_POWER, and PWR_MODE_VOLTAGE. Perturbations are skipped if the control algorithm determines they are not necessary. Leave this value at the default value.


PerturbationPulseWidth REAL

This is the width of a perturbation, entered in seconds. A perturbation includes both an increase and a decrease; each is held for this amount of time.

Leave this at the default value.


TimerRes REAL

This is the fundamental timer setting of the instrument in seconds. Leave it at the default.



This is the control mode of the signal. The following constants are valid values.






WorkingPositive BOOL

This value specifies if the working connection is connected to the positive or negative terminal.

TRUE = Working connected to positive terminal

FALSE = Working connected to negative terminal

Signal OBJECT The created PWRRAMP object.

Related Topics Link IconRelated Topics