移动线圈电流仪是一种用于检测和测量小电流的仪器。
原理其工作原则是基于以下事实：当电流携带线圈在磁场中铺设时，它会经历扭矩。
施工：它由线圈组成pqrs1线圈具有大量的绝缘铜线，该线圈在非磁性金属框架（通常是黄铜）上缠绕，该框架可能是矩形或圆形的。该线圈通过磷光条悬挂在可移动的扭转头H中，该磷青铜带在由两个强的圆柱磁极块N和S产生的均匀磁场中悬挂。
the lower end of the coil is connected to one end of a hair spring S of quartz or phosphor bronze. The other end of this highly elastic spring S is connected to a terminalt2L是软铁芯这可能是球形的如果coil is circular and cylindrical if the coil is rectangular it is so held within the coil that the coil can rotate freely without touching the iron core or pole pieces. This makes the magnetic field linked with coil to be radial field the plane of the coil in all position remains parallel to the direction of magnetic field M is concave mirror attached to the phosphor bronze strip this helps us to not the arrangement the whole arrangement is enclosed in a non - metallic case to avoid disturbance due to air etc. the case is provided with leveling screws at the base. The torsion head is connected to terminalt1。可以通过端子连接到电路t1andt2。
理论
假设线圈pqrs在磁场上自由悬浮。
令i =线圈的长度PQ或RS，
B = breadth QR ors1p1of the coil,
n =线圈中的转弯数。
一种rea of each turn of the coil一种= I X b
令B =线圈悬浮的磁场的强度。
i =电流向方向穿过线圈pQRD
在任何瞬间，是在线圈平面上绘制的正常角度与磁场方向形成的角度。
正如已经讨论过的矩形线圈在磁场中播放时携带的电流，经历了semagntidue的扭矩
τ= n / ba sin a。
如果磁场是径向的，则线圈的平面平行于磁场的方向a = 90 **和sin a =1τ= n/ba
由于这种扭矩，线圈旋转。磷铜带扭曲。由于它是一种恢复扭矩，在磷铜带中发挥了作用，该扭矩将试图将线圈恢复到原始位置。
令θ是由于线圈和k旋转而导致的磷青铜带中产生的扭曲，为磷铜条的每单位扭矩恢复扭矩
total restoring torque produced =kθ
在线圈的平衡位置，
偏转扭矩=恢复扭矩
∴ n/BA = k θ
或i = k /nbaθ或i =gθ
在哪里k / nba = g = a驱动器的常数。
它被称为驱动器常数。
因此我∝θ
这意味着挠度产物是流过驱动器的电流成比例的。这样的电量计具有线性尺度。
当单位电流流过它时，电瓦仪的电流灵敏度定义为电流计中的挠度产生。
如果当电流i通过它时，θ是电流计中的挠度
电流灵敏度
I = θ / I = nBA / k
（∴i = k /nbaθ）
the unit of current sensitivity is rad A ordiv。一种-1
voltage sensitivity of a galvanometer is defined as the deflection produced in the galvanometer when a unit voltage is applied across the two terminals of the galvanometer.
令V =电压施加在驱动器的两个端子上，
θ-在仪表仪中产生的挠度
然后电压灵敏度，
v1=θ/v
fi r=电量计的电阻
i =通过它。
然后v= IR
∴ Voltage sensitivity
V =θIR= NBA / KR
V的单位为RADv-1或div v-1
敏感的电瓦计的条件，
如果电流表现出大挠度，即使通过小电流通过它，驱动器也非常敏感。
从电流计理论
θ= nba / k i
对于给定的i。NBA/K。很大，如果
n很大
B很大
一种is large and
K很小
the value of n cannot be increased beyond a certain limit because it results in an increase of the resistance of the galvanometer and salsa makes the galvanometer bulky. This tends to decrease the sensitivity. Hence n cannot be increased beyond a limit.
the value of B can be increased by using a strong horse shoe magnet.
该值不能超过极限，因为在这种情况下，线圈不会在电瓦计仪中笨重且难以管理。
the value of k can be decreased. The value of k depends upon the nature of the material used as suspension strip. The value of k is very small for quartz or phosphor bronze. The is why in sensitive galvanometer quartz or phosphor bronze strip is used as a suspension strip.
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