Setup Parameters for ASTM CPT

The following parameters are available for the ASTM CPT experiment:

Applied E

• The potential used to polarize the specimen. The allowed range is ±8 V with a resolution of 0.125 mV. Enter values relative to the reference electrode potential or the open-circuit potential.Setup Parameters for ASTM CPT

Initial Temp

• The temperature at which the experiment begins the increasing temperature sweep. The default range is 0°C to 200°C in 0.1° increments.

Scan Rate

• The speed of the temperature sweep.The Scan Rate units are °C/minute. The range of practical temperature scan rates depends on your cell characteristics. If your data curve does not reach the temperatures requested in Setup, your scan rate is too high.

 Final Temp

• The temperature at which the experiment ends. The default range is 0°C to 200°C in 0.1° increments.

Sample Period

• The time between data points. The smallest sample period is 0.2 second. In pitting experiments we recommend sampling periods between 0.25 and 1 second.The sampling period, along with the Run Duration, determines the number of data points in a curve. There must be fewer than 32 000 data points in the curve. You can calculate the number of points from:
• Number of Points = Run Duration / Sample Period

• The current-versus-time curves from all temperatures are stored in one data file. With ten or more curves recorded in a single experiment, the data file can become very large. You can keep the data-file size manageable by recording fewer curves, or making the curves contain fewer data points.

Stop Criteria

• The current limit at which the experiment stops. This criterion is a bit more complex in that it also includes a Duration factor. The current limit needs to be met for the duration in order for the experiment to be halted. If the current drops below the current limit prior to the duration being exceeded, the counter is reset, and the experiment continues.