主要观察指标：期间和期间内的变异系数、组内相关系数、测试间变异性和测试-再测试结果的变异性。
MAIN OUTCOME MEASURES: Intrasession and intersession coefficient of variation, intraclass correlation coefficient, intratest variability, and test-retest variability.
本文主要介绍了一种心室晚电位前置放大电路，给出了测试情况和达到的技术性能指标，实验结果表明了该放大电路的可行性和可靠性。
This paper introduces the preamplifier of ventricular late potentials, and give out testing instance and performance parameters, experiment results show that this preamplifier is viable and reliable.
最后本文对射频信道的主要指标进行了测试，给出了测试结果。
Finally the main parameters of the radio frequency channel are tested and the results are given.
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