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Schlumberger 公司在法国圣恩庭的ENERTEC 工厂生产各种频率计数器已有30年的历史。2721是该厂1987年投放市场的最新产品之一,由于在以下两个方面进行了重大的改进而被认为是新一代的频率计数器:①采用 CRT 技术显示输入波形和有关测量参数(例如频率)随时间变化的图解图象;②设置了扩展滞后(ENLARGEDHYSTERESIS)的双电平触发模式.保证在很强的背景噪声中仍能进行精确的测量。
Schlumberger has been producing various frequency counters for more than 30 years at the ENERTEC plant in Saint-Jean, France. 2721 is one of the newest products that this factory put on the market in 1987, it is regarded as a new generation of frequency counter because of the significant improvement in the following two aspects: ① Use CRT technology to display the input waveform and relevant measurement parameters (such as frequency) Graphical image that changes with time ② The dual-level trigger mode with extended hysteresis (ENLARGEDHYSTERESIS) is set to ensure that accurate measurements can still be made with strong background noise.