公用电话计费器的检定周期黑龙江省电子产品监督检验所杨宏黑龙江省邮电科学研究所吴玉祥公用电话计费器使用一段时间后，准确性有可能降低。计费器作为用户与电话经营者之间结算帐务的工具，如果准确性和可靠性达不到规定的要求，势必给电话经营者、客户及电话局带来不同... Public telephone meter test cycle Heilongjiang Electronics Supervision and Inspection Institute Yang Hong Post and Telecommunications Research Institute of Heilongjiang Wu Yuxiang public telephone meter after using a period of time, the accuracy may be reduced. As a tool for settlement of accounts between users and telephone operators, chargers inevitably bring different requirements to telephone operators, customers and telephone offices if accuracy and reliability are not met ...