Leakage Current - Setup Parameters (page 2)

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Leakage Current - Setup Parameters (page 2)

Description

Second setup page of the Leakage Current experiment. Press OK to continue or Cancel to go back to the first setup page.

 

D - PWR Leakage Current - page 2

 

Parameter

Description

Units

Voltage

The constant voltage applied to the working electrode during the measurement.

volts (V)

I/E Range Mode

Select the current range mode and choose between Auto mode or Fixed mode.

 

If set to Auto mode, the I/E Range changes depending on the measured current to optimize the current resolution/error. Auto-ranging does not work well for very small currents or faster sample periods. Do not use Auto mode with sample periods faster than ~1 s.

 

Gamry tip bulb

We recommend Fixed mode, which sets the I/E Range based on the specified Max Current.

 

Max Current

Max Current controls the current measurement range if I/E Range is set to Fixed mode. If I/E Range is set to Auto mode, Max Current specifies the maximum expected starting current.

 

The software adjusts the current range based on the Max Current input. In order to use the most sensitive range that will not overload, the software chooses the current range based on a value that is 89% of the full-scale current range.

 

Gamry tip bulb

The Max Current parameter is a current, not a current density.

 

If your current data look very choppy and stepped, the problem could be a poorly selected current range. If you enter a Max Current value of 10 mA and the maximum current in your sweep is only 100 mA, you are only using 1/100th of the potentiostat's A/D converter range. The result is a significant quantization error. Rerun the test entering a smaller Max Current value.

 

If your current data show perfectly flat and horizontal regions, the current has most likely overloaded the potentiostat's current-measurement circuits. Check that the value that you entered for the Max Current parameter is larger than the actual measured cell current. Try rerunning the test with a larger value for the Max Current.

amperes (A)

Minimum ESR

The minimum Equivalent Series Resistance (ESR) of the cell. No capacitor or conductor behaves ideally, but instead acts like a capacitor or inductor in series with a resistor. This resistor is the ESR.

 

Minimum ESR helps to set the appropriate current (I/E) ranges.

ohm

Max Time

Specify the maximum time of the experiment. The first field specifies the value. Select the unit from the drop-down list.

seconds (s), minutes (min), hours (hr), days (d)

Sample Period

The spacing between data points. The shortest Sample Period we recommend is 0.5 s (50 ms). The longest Sample Period allowed is 715 s for Reference potentiostats and 750 s for Interface potentiostats.

 

Use Sample Period to determine the Number of Points in the data curve as follows:

 

 

The Number of Points must be less than 262 143 (218 - 1). If you have more points, the experiment aborts just before the data acquisition phase of the sequence. The resolution in the Total Time is controlled by the Sample Period. Times that are not integer multiples of the Sample Period are rounded down. For example, if the Sample Period is set for 8 seconds, and a Total Time of 900 seconds is requested, the actual Total Time will be 896 seconds, which is 112 Sample Periods.

seconds (s)

 

Related Topics

Leakage Current - setup page 1