Wilmanns I, Stodtmeister R
Albrecht Von Graefes Arch Klin Exp Ophthalmol. 1977 Dec 31;205(1):33-9. doi: 10.1007/BF00413461.
The method described in this paper permits determination of amplification, band-pass properties, and electrode impedance in electrophysiological experimental setups. The battery powered test-signal generator drives square-wave current pulses through a 2 ohm resistance, which acts as a source of 100 muV p-p pulses. The 2 ohm resistor is wired in series with one of the electrode leads and remains there permanently. For calibration of the above-mentioned properties, one need only turn the generator on, without changing the measurement setup. By observing the shape of the square waves after passing through the system, it is possible to judge the band-pass characteristics of the entire system. Electrode impedance may be measured by putting a (variable) resistor in parallel with the preamplifier input. The test signal current is of the same order of magnitude as currents from biological signal sources. This method makes working with electrophysiological measurement systems which are used in electroretinography, electrooculography, and recording of visually-evoked cortical potentials in ophthalmology much easier.
本文所述方法可用于测定电生理实验装置中的放大倍数、带通特性和电极阻抗。电池供电的测试信号发生器驱动方波电流脉冲通过一个2欧姆的电阻，该电阻作为100 μV p-p脉冲的源。2欧姆电阻与其中一根电极引线串联，并永久连接在那里。为了校准上述特性，只需打开发生器，而无需改变测量设置。通过观察方波通过系统后的形状，可以判断整个系统的带通特性。电极阻抗可以通过在前置放大器输入端并联一个（可变）电阻来测量。测试信号电流与生物信号源产生的电流大小相当。这种方法使使用视网膜电图、眼电图以及眼科中视觉诱发皮层电位记录所用电生理测量系统的工作变得更加容易。
