Current & Voltage / time

Current & Voltage permits the continuous measurement of potential and galvanic readings. Should the read rate be infrequent (one point every 15 minutes) consider using a Long Term test with Potential Measurement and Galvanic Measurement tests. The Long Term has the advantage of freeing up the instrument during measurements where as Current & Voltage holds on the instrument during measurements.

The maximum read rate for Current & Voltage is limited by the mains frequency 0.02 for 50Hz and .0166667 for 60Hz. With Over Sample Measurements aliasing errors can be reduced for example if a reading was to be recorded once a second with over sample switched on the instrument will record at roughly 30 measurements per second an averaged result would be obtained from these 30 measurements thus reducing aliasing errors. It should be noted over sampling will only work when the read rate less than the mains frequency ÷ 2.

If count resisters are permitted to auto range during the test and a count resistor change happens a delay will occur from when the new count resistor was set. The delay allows the cell to settle a set length of time dependant upon the resistor set. Whilst a delay is taking place the test continues but no data is stored during the delay later in the analysis a straight line will be present from the change point to the point after the delay has finished.

Couple Aux Electrode to WE2 allows 3 electrode cells to record galvanic measurements the AE connection normally used to polarise the test can be switched to act as WE2 so WE2 does not have to be connected.

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