QWA-5A石英钟表分析仪说明书（英文）.pdf免费

QWA-5A CLOCK TESTER USER MANUAL SHEN ZHEN WISDOM SOURCE ELECTRONICS CO LTD [ADRESS：Mingzhi Street, Baoan District, ShenZhen, China] 1. Overview The new QWA-5A clock tester is suitable for precisely testing all kinds of clock circuits with crystal oscillator working at 32.768KHz, for example: quartz clocks、electronic watt-hour meter、 computer motherboard 、temperature controller 、timer 、electronic weigher and electronic cash register with timer function. Its appearance is depicted as Figure.1. Figure.1 QWA-5A clock tester QWA-5A clock tester especially suits the fast testing of finished products or semi-finished products. Additionally, our QWA-5A clock tester has a tinny probe with it, which can suits the testing of bigger circuit boards. QWA-5A has three stalls:  ppm：part per million  s/d ：seconds/day  s/m ：seconds/month Compared with the same type of products from other companies, our QWA-5A has the following advantages:  with a more sensitive sensor in it;  taking non-contact method;  with advanced CPU and TCXO(Temperature Compensated Crystal Oscillator);  with the function of alarming, and the user can set alarming range;  easy setting procedure;  accuracy is better than 0.3ppm;  parameters that was set once won’t be lost when starting again 2. Features ① measuring objects: quartz clock and clock circuit board ② voltage: 180V-240V AC 50Hz 60Hz ③ testing frequency: 32.768KHz ④ reference frequency:16.384MHZ TCXO ⑤ testing accuracy: better than 0.3ppm ⑥ range: ppm：part per million; s/d：seconds/day; s/m ：seconds/month ⑦ signal strength indicator: level meter indicator ⑧ alarming setting range:±220ppm ⑨ volume: 23.5cm×10.5cm×30cm ⑩d