用Z80A型单板机、12位A/D、D/A转换板及自制的测量放大控制板、恒电位仪等组成采样系统。最小采样间隔32μs。用汇编语言和编译BASIC语言编写各类程序。 以电位阶跃为激励信号,对模拟电路及Pt,Fe(CN)_6~(3-)/Fe(CN)_6~(4-)体系的响应电流采样。又应用第1部份的数学方法,求出阻抗值作出Nyguist图和Randle图,其结果与理论值或文献值一致。还初步探讨了不同[Cu~(2+)]及添加不同浓度明胶时Cu~(2+)/Cu体系的交流阻抗特征。
A sampling system was assembled with microcomputer, A/D & D/A converter and self-made amplifier & potentiostat. Software consisted of assembly and quick BASIC languages. The maximum sampling rate is 32μs/point. The response current to the step voltage perturbation was sampled, then the algorithm in part Ⅰ of this title was employed and interracial impedance in electrochemical systems was determined. Results of impedance measurements of some equivalent circuits and the Pt, Fe (CN)_6~(3-)/Fe(CN)_6~(4-) system agreed well with closed-form solutions or literature data, thus demonstrating the ability of the computerized measurement system. Measurements with CuSO_4+gelatin systems yielded the expected impedance. Nyquist plot exhibited sufficiently the effect of the dope concentration.
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