GB/T 22779-2017 English PDF

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GB/T 22779-2017: Liquid crystal displaying quartz clocks
Status: Valid

GB/T 22779: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 22779-2017	199	Add to Cart	3 days	Liquid crystal displaying quartz clocks	Valid
GB/T 22779-2008	399	Add to Cart	3 days	Liquid crystal displaying quartz clocks	Obsolete

Similar standards

GB/T 38023   GB/T 30106   QB/T 4055.2   GB/T 22778   GB/T 22777   

Basic data

Standard ID: GB/T 22779-2017 (GB/T22779-2017)
Description (Translated English): Liquid crystal displaying quartz clocks
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: Y11
Classification of International Standard: 39.040.20
Word Count Estimation: 10,196
Date of Issue: 2017-05-12
Date of Implementation: 2017-12-01
Older Standard (superseded by this standard): GB/T 22779-2008
Quoted Standard: GB/T 2828.1; GB/T 2829; GB/T 4028; GB/T 17626.2
Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary: This standard specifies the requirements, test methods, inspection rules and signs, packaging, transportation and storage of liquid crystal quartz clocks ("LCD clocks"). This standard is applicable to liquid crystal quartz clocks with quartz resonators, nominal operating voltage of DC3.0 V or DC1.50 V with time and date display or other additional functions.

GB/T 22779-2017: Liquid crystal displaying quartz clocks

---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.
Liquid crystal display quartz clocks ICS 39.040.20 Y11 National Standards of People's Republic of China Replace GB/T 22779-2008 Liquid crystal quartz clock 2017-05-12 released 2017-12-01 implementation General Administration of Quality Supervision, Inspection and Quarantine of the People 's Republic of China China National Standardization Management Committee released

Foreword

This standard is drafted in accordance with the rules given in GB/T 1.1-2009. This standard replaces GB/T 22779-2008 "liquid crystal quartz clock". Compared with GB/T 22779-2008, the main technical changes as follows. - modified the "normative reference document" (see Chapter 2); - modified "voltage range" and its test methods (see 3.2.4.4.2); - modified "use reliability" requirements (see 3.3); --- modify the "instantaneous difference" "average instantaneous difference" "voltage coefficient" of the index value (see Table 1); --- Change the "average temperature coefficient" to "temperature coefficient" and modify its index value (see Table 1); --- modify the "average power consumption" of the index value (see Table 2); --- modified the LCD clock to add time or alarm power consumption current (see Table 3); --- increased the "antistatic performance" requirements and test methods (see 3.14,4.4.16); --- modified the "equipment" (see Table 4); - modified the "appearance" requirements and their test methods (see 3.10.4, 4.10); --- in the "factory inspection" to increase the "timekeeping, alarm volume" test items (see Table 5); In the "type test" to increase the "timekeeping, alarm volume" and "antistatic performance" test items (see Table 6); - modified the special circumstances required for type testing (see 5.2.4); --- modified "packaging" requirements (see 6.2.2). This standard is proposed by the China Light Industry Federation. This standard by the National Standardization Technical Committee (SAC/TC160) centralized. The drafting of the standard unit. Fujian Province, State Electronic Technology Co., Ltd., light industry, watches and clocks, Shishi City letter good Electronics Co., Ltd., deep Shenzhen satisfied crystal microelectronics Co., Ltd., Zhangzhou City Yingzi watches and clocks, Ltd. The main drafters of this standard. Lin Jian, Wu Xiaolin, Jin Yingshu, Chen Bin, Li Ping, Liu Zhong, Zhao Xiilei, Hong Yulan. This standard replaced the previous version of the standard release. --- GB/T 22779-2008. Liquid crystal quartz clock

1 Scope

This standard specifies the requirements, test methods, inspection rules and marking, packaging, transportation and storage of liquid crystal quartz clock ("LCD clock"). This standard applies to quartz resonators with a nominal operating voltage of DC3.0V or DC1.50V with time and date display or its He added the function of the LCD quartz clock.

2 normative reference documents

The following documents are indispensable for the application of this document. For dated references, only the dated edition applies to this article Pieces. For undated references, the latest edition (including all modifications) applies to this document. GB/T 2828.1 Sampling inspection procedures Part 1. Batch inspection sampling plan for retrieval by quality limit (AQL) GB/T 2829 Periodic inspection techniques Sampling procedures and tables (for testing of process stability) Inspection mark of GB/T 4028 timing instrument Electromagnetic compatibility - Test and measurement techniques - Electrostatic discharge immunity test GB/T

3 request

3.1 Operating temperature LCD clock in the 0 ℃ ~ 50 ℃ temperature range should not stop, the LCD display is normal. 3.2 voltage range Nominal working voltage of DC3.0V LCD clock in the DC3.3V ~ DC2.7V voltage range should not stop, the LCD display is normal. Nominal working voltage of DC1.50V LCD clock in the DC1.65V ~ DC1.35V voltage range should not stop, the LCD display is normal. 3.3 Use reliability LCD clock under normal conditions of use should not stop, the LCD display should be clear and accurate, there should be no missing, multi-stroke phenomenon; the buttons and functions Key operation should be flexible and reliable, zero, the Department, the components should not fall off their own. 3.4 Instantaneous difference m and mean instantaneous day difference The instantaneous day difference and the average instantaneous day difference of the LCD clock shall be in accordance with Table 1. Table 1 Projects and Indicators Serial number item index Excellent first class qualified Instantaneous difference m/(s/d) Average instantaneous difference 􀭿m/(s/d) -0.5 to 0.5-1.0 to 1.0-1.5 to 1.5 2 temperature coefficient Ct1, Ct2/[s/(d · ° C)] -0.05 to 0.05 -0.10 to 0.10 -0.10 to 0.10 3 voltage coefficient CV/[s/(d · V)] -1.0 to 1.0 -1.5 to 1.5 -2.0 to 2.0 ......

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