JJG 874-2007 English PDFJJG 874: Historical versions
Basic dataStandard ID: JJG 874-2007 (JJG874-2007)Description (Translated English): Verification Regulation of Temperature Indication Controller Sector / Industry: Metrology & Measurement Industry Standard Classification of Chinese Standard: A54 Classification of International Standard: 17.200 Word Count Estimation: 12,130 Date of Issue: 2007-02-28 Date of Implementation: 2007-08-28 Older Standard (superseded by this standard): JJG 874-1994 Quoted Standard: AQSIQ Announcement No. 41 of 2007 Regulation (derived from): AQSIQ Announcement No. 41 of 2007 Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine Summary: This standard applies to measuring range (-50 ~ +300)��C, using temperature thermistor or other temperature sensors Semiconductor Analog and digital temperature indicator, temperature indicator controller and temperature control instrument for initial verification, subsequent testing and use of the test. JJG 874-2007: Verification Regulation of Temperature Indication Controller---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.Verification Regulation of Temperature Indication Controller State verification procedures People's Republic of China Temperature indicator controller Posted 2007-02-28 2007-08-28 implementation The State Administration of Quality Supervision, Inspection and Quarantine released Temperature indicator controller verification procedures Temp Replacing JJG 874-1994 The regulations by the State Administration of Quality Supervision, Inspection and Quarantine, 2007 February 28 ratification and From August 28, 2007 into effect. Focal point. the National Technical Committee of temperature measurement Main drafting unit. Tianjin Institute of Measurement Technology Participated in the drafting unit. Changzhou Institute of Measurement Technology Italy Oulong Strong (China/Hong Kong) representative office Testo Instruments International Trading (Shanghai) Co., Ltd. Xuzhou elite Electrical Technology Co., Ltd. The temperature measurement procedures commissioned the National Technical Committee is responsible for interpretation The main drafters of this procedure. WANG Chao (Tianjin Measurement Institute of Technology) Liu Wei (Tianjin Measurement Institute of Technology) Tian Yun (Tianjin Measurement Institute of Technology) Drafters participate. Swelled (Changzhou Institute of Technology measurement) Wu Zhengrong (Italy Oulong strong (China/Hong Kong) representative office) Chen Jun (Testo Instruments International Trading (Shanghai) Co., Ltd.) Lichao Fei (Xuzhou elite Electrical Technology Co., Ltd.) table of Contents1 Scope (1) 2 Terms (1) 3 Overview (1) 4 metering performance requirements (2) 4.1 Indication error (2) 4.2 Stability (2) 4.3 setpoint error (2) 4.4 switching difference (2) 5 General Requirements (2) 5.1 Appearance (2) 5.2 Insulation resistance (3) 5.3 dielectric strength (3) 6 Control of measuring instruments (3) 6.1 Verification condition (3) 6.2 Verification Project (4) 6.3 Verification Methods (4) Processing 6.4 Verification Results (6) 6.5 test cycle (6) Appendix A Calibrating temperature indicator control record format (7) Temperature indicator controller verification procedures1 ScopeThe order applies to measuring range (-50 ~ 300) ℃, using temperature thermistor or other semiconductor test class Temperature Sensor Analog and digital temperature indicator, indicating temperature controller and temperature control device (hereinafter referred to as the thermostat Meter) of the initial verification, subsequent verification and use of tests.2 Terms2.1 temperature thermistor thermomistor The resistance value of index changes with temperature was polycrystalline semiconductor materials for temperature measurement of the temperature sensing element. 2.2 Setpoint error errorofsetpoint Output variable according to the requirements output, the temperature difference between the measured value and the set point temperature corresponding to the value. 2.3 Switching value cut-offvalue When the temperature controller stroke (or the next trip), the output from one state to another state of the measured temperature value. 2.4 switching difference differenceofcut-offvalue , The difference between the value of the next trip switch. 2.5 Division value scaleinterval The difference between two values corresponding to two adjacent scale marks. 2.6 reticle graduationline Within the limits shown the limits to the scale value scale marks segments. 2.7 master reticle mainscalemark Limit value within the limits shown scale scale marks segments have specific values. Its more general line dividing line thickness.3 OverviewTemperature controller general instructions by the temperature control composed of two parts together or separately. Temperature part is based on the temperature sensor varies with temperature and changes in the characteristics, the respective circuits (including application operation After amplifiers, microprocessors, etc.) processed by meter indicates the corresponding temperature. Temperature setting circuit part generally consists of the corresponding signal processing circuit and the comparator circuit, digital control execution circuit composition. Figure 1 indicates the temperature controller Block Diagram ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of JJG 874-2007_English be delivered?Answer: Upon your order, we will start to translate JJG 874-2007_English as soon as possible, and keep you informed of the progress. 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Otherwise, follow the normal steps: Add to Cart -- Checkout -- Select your currency to pay.Question 5: Should I purchase the latest version JJG 874-2007?Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version JJG 874-2007 even if the enforcement date is in future. Complying with the latest version means that, by default, it also complies with all the earlier versions, technically. |