Standard No.:	JJG 391-2009
English Name:	Force Transducers
Chinese Name:	力传感器
Professional Classification:	JJ    Metering
Source Content Issued by:	AQSIQ
Issued on:	2009-10-9
Implemented on:	2010-4-9
Status:	valid
Target Language:	English
File Format:	PDF
Word Count:	8000 words
Translation Price(USD):	240.0
Delivery:	via email in 1 business day

JJG 391-2009 Force transducers 1 Scope This regulation is applicable to the initial verification, subsequent verification and in-service inspection of force transducers. 2 Normative references The following documents are referenced in this regulation: GB/T 7665-2005 General terminology for transducers JJF 1011-2006 Terminology and definitions for metrology of force and hardness While applying this regulation, attention shall be paid to make sure that the referenced ones are currently effective editions of the above documents. 3 Symbols and meanings The symbols used in this regulation and their units and meanings are shown in Table 1. Table 1 Symbols, units and meanings Symbol Unit Meaning Z %FS Zero-point output of force transducer Zd %FS Zero drift of force transducer R %FS Repeatability of force transducer L %FS Linearity of force transducer H %FS Hysteresis of force transducer Cp %FS Creep of force transducer Cr %FS Creep recovery of force transducer Sb %FS/month Long-term stability of force transducer St %FS/10K Influence of rated output temperature of force transducer Zt %FS/10K Influence of zero-point output temperature of force transducer θ0 μV, mV, mV/V Zero-point output value of force transducer after the preheating is completed θf μV, mV, mV/V Rated output values of force transducer Fn N, kN Rated load of force transducer θ0max μV, mV, mV/V The maximum value of zero-point output of force transducer within 30min θ0min μV, mV, mV/V The minimum value of zero-point output of force transducer within 30min θfφ(φ=0°) μV, mV, mV/V Rated output value of force transducer at a 0° azimuth angle m — Number of verification cycles θfj μV, mV, mV/V Output reading at rated load during the jth measurement at a 0° azimuth angle θ0j μV, mV, mV/V Output reading at zero load during the jth (j = 1, 2, …, m) measurement at a 0° azimuth angle n — Number of rotation angles θfφ μV, mV, mV/V Rated output reading of force transducer at the φ azimuth angle, where φ is respectively 0°, 120°, 240° or 0°, 90°, 180°, 270° θ0φ μV, mV, mV/V Zero-point output reading of force transducer at the φ azimuth angle, where φ is respectively 0°, 120°, 240° or 0°, 90°, 180°, 270° ΔθR μV, mV, mV/V The maximum value of output range at each load point when the process is repeatedly calibrated ΔθL μV, mV, mV/V The maximum value of straight-line deviation between the average calibration curve of the process and the average endpoint ΔθH μV, mV, mV/V The maximum deviation between the average calibration curves of the return and the process S mV/V Output sensitivity of force transducer V Average value of the excitation voltage measurements at the beginning and end of the force transducer loading test S' mV/V Output sensitivity of force transducer during the last calibration Zth, Ztl %FS Influence of zero-point output temperature at the upper limit temperature and the lower limit temperature respectively Th, Ts, Tl °C Upper limit temperature, standard verification temperature and lower limit temperature respectively during verification θ0h, θ0s, θ0l μV, mV, mV/V Average values of zero point outputs corresponding to Th, Ts, Tl respectively Sth, Stl %FS Influence of rated output temperature at the upper limit temperature and the lower limit temperature respectively θfh, θfs, θfl μV, mV, mV/V Average values of rated loads corresponding to Th, Ts, Tl respectively Notes 1. %FS — indicates "% of rated output", that is, the percentage relative to the rated output (the same below). 2. When calibrating force transducers, it is allowed to use other units for reading and calculation. 4 General

Contents 1 Scope 2 Normative references 3 Symbols and meanings 4 General 5 Metrological performance requirements 6 General technical requirements 7 Control of metrological instruments Annex A Format of inside page of verification certificate of force transducer Annex B Format of inside page of verification result notification of force transducer Annex C Verification record of force transducer