CH-1A型机动车辆计数仪,是由湖南省交通科研所研制成功,经湖南省交通厅通过鉴定,并由长沙电子仪器二厂投入了生产。该仪器能满足交通流量统计分析、资料收集的需要;解决了人工观测数据不可靠等问题。该仪器采用CMOS数字集成电路作线性放大器,用廉价型计算器作计数显示器。功率小,不用交流电,只用四节一号电池可连续昼夜使用三个月 CH-1A-type motor vehicle counters, developed by the Hunan Provincial Communications Research Institute, Hunan Provincial Communications Department passed the appraisal, and by the Changsha Electronic Instrument Factory into production. The instrument can meet the traffic flow statistical analysis, data collection needs; to solve the problem of artificial observation data is not reliable. The instrument uses CMOS digital integrated circuits for linear amplifier, with cheap calculator for counting display. Small power, no AC, only four AA batteries can be used continuously for three months day and night