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| The 394/384B and 303A systems can be tested up to the pin jacks in the rear of the 303A. This can help determine if the observed problem is prior to these points (i.e. in the 384B/394/pstat or the 303A electrometer or CPU), or if it is after these points (i.e. in the reference electrode, capillary, valve body, cell, etc.). To perform this test, you will need a 1 megaohm resistor, and make connections to the resistor and to the 303A pin jacks as shown in the diagram below. Once you have the resistor connected, you need to empty the cell bottom of its electrolyte so that there is no continuity between the 303A's electrodes. Next, perform either a LSV (linear sweep voltammetry) or CV (cyclic voltammetry) experiment (Note: you can not test a resistor with SWV or pulse techniques!). If you perform a CV from 0 V to 1 V and back to 0 V, your current readings on the graph should obey Ohm's Law, with the current apex being 1µA (corresponding to 1 V across 1 MW). If this test shows expected results, then the problem is most likely with the cell (303A) or mercury flow. |
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