GB/T 38021-2019 English PDFUS$184.00 · In stock
Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 38021-2019: Analogue quartz clocks - Timing accuracy Status: Valid
Basic dataStandard ID: GB/T 38021-2019 (GB/T38021-2019)Description (Translated English): Analogue quartz clocks - Timing accuracy Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: Y11 Classification of International Standard: 39.040.20 Word Count Estimation: 10,194 Date of Issue: 2019-08-30 Date of Implementation: 2020-03-01 Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration GB/T 38021-2019: Analogue quartz clocks - Timing accuracy---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.Analogue quartz clocks - Timing accuracy ICS 39.040.20 Y11 National Standards of People's Republic of China Pointer quartz clock travel accuracy (ISO 19235.2015, IDT) Published on.2019-08-30 2020-03-01 implementation State market supervision and administration China National Standardization Administration issued ForewordThis standard was drafted in accordance with the rules given in GB/T 1.1-2009. This standard uses the translation method equivalent to ISO 19235.2015 "pointer type quartz clock travel time accuracy". This standard was proposed by the China Light Industry Association. This standard is under the jurisdiction of the National Clock Standardization Technical Committee (SAC/TC160). This standard was drafted. Shenzhen Jinbawang Precision Electronics Co., Ltd., Shenzhen Titan Clock Technology Co., Ltd., Xi'an Light Industry Clock Table Research Co., Ltd., Yantai Polaris State-owned Holdings Co., Ltd., Shengzhou Hengli Electronics Co., Ltd., Changzhou Jingke Industrial Co., Ltd. Fujian Shangrun Precision Instrument Co., Ltd., Fujian Shengbang Electronic Technology Co., Ltd., Guangzhou Fuda Watch Industry Co., Ltd., Fujian Ruida Seiko Co., Ltd., Fujian Jibang Electronics Co., Ltd., Yantai Long-lasting Watch Group Co., Ltd. The main drafters of this standard. Zhu Jihua, Yin Xiaoyu, Wang Yanmin, He Guangxian, Jin Yingshu, Yu Hongyun, Yu Chengbo, Shao Yueming, Lan Liping, Sun Gang, Su Fangzhong, Lin Jian, Wu Xiaolin, Luo Xiaomei, Jiang Wei, Li Xia, Chen Yili, Qiu Xuqiang, Sun Yukai. Pointer quartz clock travel accuracy1 ScopeThis standard specifies the basic parameters, requirements and test methods for the accuracy of the walking time of the quartz clock (hereinafter referred to as "quartz clock"). This standard is applicable to the quartz quartz clock and wall clock with crystal frequency of 32768Hz and nominal voltage of DC1.5V. The bell heart can also be used as reference. This standard does not apply to the following quartz clocks. ---Special use of the clock on aircraft, ships, vehicles and other equipment; ---The clock matched with other products; --- Radio clock.2 Terms and definitionsThe following terms and definitions apply to this document. 2.1 Average instantaneous difference melaninstantaneousrate m The arithmetic mean of the three instantaneous differences of the quartz clocks tested in consecutive 3d, in units of "s/d" or "s/month". 2.2 Voltage coefficient CU The rate of change of the instantaneous difference in the quartz clock due to changes in the supply voltage. 2.3 Temperature coefficient Ct The rate of change of the instantaneous difference in the quartz clock due to temperature changes. 2.4 Nominal voltage nominalvoltage Un The voltage identified by the movement.3 Basic parameters and requirements for travel time accuracy3.1 Average instantaneous difference m After the quartz clock is continuously transported for 3 days, the average instantaneous difference should be in the range of -1.0 s/d to 1.0 s/d. 3.2 Voltage coefficient CU The voltage coefficient CU should be in the range of -1.0 s/(d · V) ~ 1.0 s/(d · V). ...... |
