310 series

      The 310 series are  ultra low bias current varactors and bridge operational amplifiers.Then we give a general description about the 310 series.They have extremely low input bias currents and high input impedances. Therefore they are widely used in the field of electrometer amplifier which have traditionally been fulfilled (though vrey complicated) by vacuum electrometer tubes.To reach ideal effect in the field of electrometer amplifier,extremely high source impedances or where infinitesimal currents must be measured or amplified. Then the 310 amplifier has varactor bridge inputs which meets the standard.Otherwise, it has small voltage drifts, minimized noise and low cost.The operation of varactor bridge amplifiers is similar to that of vibrating reed electrometers (parametric) including the inherent advantages of solid state design.
      Then you can get some information about the310 series.There are two features as follows.The first one is that the maximum guaranteed low bias is 10-14A max.The second one is that the maximum  low voltage drift  is 10mV/.
      You have to get some detail information about the  310 series if you want to purchase the product.The high quality signal input is the inverting input terminal, and is made for the measurements of current signals. This type of signal source has a common use in the gas chromatograph flame detectors, photomultiplier tubes, radiation detectors,logarithmic compression over an extremely wide dynamic range and in the construction of very-long-time-constant integrators or differentiators. Otherwise, the input signals from picoamps to milliamps may be suitable with the femtoamp current resolution.