Use the Scaling Factor column in the Tests table on the Tests tab of the Semiconductor Multi Test step and the Semiconductor Sequence Call step to specify the scaling factor for the base units for test limits and measurements.

Changing the scaling factor in the Scaling Factor column in the Tests table sets the same scaling factor for the limits and the measurement.

To specify different scaling factors for each limit and the measurement, use the Property Browser panel on the Properties tab of the Step Settings pane and set the following properties:

Property Description
Step.Result.Evaluations[i].NumericLimit.DataScalingExponent Measurement scaling factor
Step.Result.Evaluations[i].NumericLimit.LowLimitScalingExponent Low limit scaling factor
Step.Result.Evaluations[i].NumericLimit.HighLimitScalingExponent High limit scaling factor

The Semiconductor Multi Test step and the Semiconductor Sequence Call step use the scaling factors in the following ways:

  • Measurement Value Scaling Factor—The steps assume the measurement values that code modules publish use base units. At run time, the steps use the measurement scaling factor to display the measurement value in scaled units in the Data column of the Tests table. The STDF Log result processing plug-in stores the corresponding scaling exponent in the RES_SCAL field of the PTRs. The Debug Test Results Log result processing plug-in uses the measurement scaling factor to format the values and units in the Measurement Value column of the Debug Test Results Log.
  • Limits Scaling Factors—The steps assume the limit values in the Low Limit and High Limit columns use scaled units. At run time, the steps use the limit scaling factors to convert the limit values to base units to compare the measurement value to the limit values. The STDF Log result processing plug-in stores the corresponding scaling exponents for the low limit and high limit scaling factors in the LLM_SCAL and HLM_SCAL fields of the PTRs. The Debug Test Results Log result processing plug-in uses the limit scaling factors to add units to the values in the Low Limit and High Limit columns of the Debug Test Results Log.

Supported Scaling Factors

TSM recognizes the following scaling factors, which correspond to the recognized values for the RES_SCAL, HLM_SCAL, and LLM_SCAL fields of the STDF Parametric Test Records (PTRs):

Scaling Factor Name Scaling Factor Value Units Prefix DataScalingExponent, LowLimitScalingExponent, and HighLimitScalingExponent Property Values STDF _SCAL Field Value
femto 10-15 f -15 15
pico 10-12 p -12 12
nano 10-9 n -9 9
micro 10-6 u -6 6
milli 10-3 m -3 3
percent 10-2 % -2 2
<blank> 1 0 0
kilo 103 K 3 -3
mega 106 M 6 -6
giga 109 G 9 -9
tera 1012 T 12 -12