The spacing between data points, in seconds. The shortest Sample Period we recommend is 0.25 second. The longest Sample Period allowed is 715 seconds.
The Sample Period also helps determine the Step Size of the staircase ramp and the Number of Points in the data curve. The length of a step in the staircase ramp is the Sample Period directly. The height of a step depends on both the Scan Rate and the Sample Period. Calculate the Step Size and the Number of Points in the scan from:
Step Size = Scan Rate × Sample Period
Number of Points = Scan Range / Step Size
Step Size is rounded to the resolution of the D/A converter making the steps. The resolution of the D/A converter is dependent on the type of potentiostat you are using. Consult your potentiostat manual for more information. A typical Step Size for a Galvanodynamic scan is about 0.2% fullscale current/step.
If the Step Size has to be rounded to fit the resolution of the D/A converter, the Sample Period is also adjusted so that the Scan Rate is correct.
The Number of Points must be less than 262143. If you have more points, the experiment will abort just before the scan phase of the sequence.
Here is an example.
1. Assume a sweep from –10 mA to +25 mA, at 0.1 mA/s.
2. Take data at 2 seconds/point.
3. Step Size is 0.1 mA/s × 2 s/point = 0.2 mA/step.
4. The program chooses the 30 mA range, so the D/A resolution is 0.00333% of 30 mA or 0.001 mA/bit. Each step is therefore 200 bits on the D/A converter.
5. The Number of Points in the scan = 35 mA/0.2 mA/step, or 175 points.
