电测量指示仪表用游丝

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1、中华人民共和国国家标准GB2788-81电测量指示仪表用游丝本标准适用于电测量指示仪表用锡青铜、皱青铜游丝，转矩为5〜20000iiN・crn.90。电测量指示仪表用游丝精度分为：A级••精密级：B级••普通级。1游丝形状及标注1.1游丝形状标注应符合下图。图t：r-游丝外半径；「1・游丝内半径；b•游丝宽度；h・游丝厚度1.2游丝转矩游丝弹性后效及游丝圈数(n)均在图示中有“”标记的两点上测量。1.3标注方法：例如：外半径r=3.5mm,转矩M=20uN・cm.90°的锡青铜，精密级游丝应标注为：游丝A3.5X20-QSn4-3GB2788-312

2、规格系列及参数最大允许误差2.1游丝的系列规格及参数应符合表1规定。国家标准总局发布1982年8月1日实施国家仪器仪表工业总局提出哈尔滨电工仪衣硏究所起草外半屁r(mm)内半轻

3、10.92500.87550,96.0.83600b920.79700r850J4800•出0.6990叭750.651000,710“621100J60.661250,710,6251400.670.611600.630.541800,590.512000.560.49续表1外半径内半径(mm)(mm)12—144.5圈数转矩1M(卜)电阻值R一锯诗铜(Q)(Q)62200.590.512500.550t482800,520,453200.490.42360oje0J04000.430.384500.410.365000,390.343102.11

4、312-91J141.8】.64JG1.91.7181.81.6201.71.5221.61J251.51.35281.61>431].3351.51.340】・41,2451.31-1501<2ia551,2KO601J0.9770S0,90800/970.84690140.871000.950.821100.900.7812a0.850.741400.800J0)600.750,65宽厚比续表1外半隹5.5内半径(mm)1J512—1410—12圈数转矩M(pN*cm/9OG)电阻值Rn簡青铜61800<612000.670.5

5、92200€552500300.5272800.610.633200.570,503600,540.474000.510t444500.480.425000.460.405600v4S0.386300.4】0.367000.390.348000e360.319000.340#3010000.320.2811000.310,2712000.290.2514000.270.2416000.260.2218000.240.2120000.230.20450IM1J601.2uoSO1』0,901000.920301200.840J31400.780.675

6、160Oe«l0.72ISO0.760.672000.720.632200.690.61覚■比b/h续表1续表1外半包r(mm)内半径ri(mm)宽耳比h/h圈数n转矩M(典N*cm/90°)电限值R锡育铜(Q>(Q>520010«900J9理一10.94Q.82250I0380.776280

7、0.830J3320OJB0.68360

8、0.730•机400I0.740364500.700.627500J0,660f5»56010.63叭566500.650.56700

9、0.610.538000.570.609000.540.4710000.4572.

10、58~1011000»490.4212500.460.401400叭430,3816000.400.35818000.380.3320000.360.3122000.340.3025000.320.2828000*310.2732000.290.2536000.270.2340000.260.2245000.240.2150000.230.2056000.230.20963000.220J970000.200.18续表1外半径r(mm)内半轻ri(mm)宽厚比b/ha数n转矩M(

11、xN-cm/90*)电阻值R«It(Q)帔青羯（a）72.5a~io9

12、80000.190*17SOTO0J8叭16100000#170J5119000#160.149381000