3810 series

      3810 series  is a kind of ultra-high value precision resistors.
      Firsly, it has five unnique features. The first one is resistance range up to (1014 ohms). The second one is designed for low current (pica ampere level)measurements. The third one is low voltage coefficient. The forth one is hermetically sealed. The last one is leakage current minimised by hermetic sealing and guard ring.
      Secondly , it also has some important electrical data which will give you a better understanding of our product. About electrical data : Resistance range(ohms) is 100M to 1T(3810), 100M to 1T ,1T to 100T. Limiting element voltage (volts) is 500 ,1000,1000.TCR (20°C to 70°C) (ppm/°C) is-500 to -3500.Ambient temperature range (°C )is -40 to 100. 
     Thirdly,an introduction of its construction will be given to you. The cermetox® resistive film is fired onto high quality ceramic substrate; brass end caps are forced fitted to the substrate which is then adjusted to value with a helical cut in the film; the leads are mechanically locked into the end caps and the assembly sealed into the glass envelope. All close tolerance units utilise two resistors connected in series within the glass envelope. The guard band is described, with application notes, in a Product Information sheet, available on request.
     Forthly, there are some other detail information about it . As to terminations,  the material is solder-coated dumet wire.Strength of the terminations meet the requirements of IEC 68.2.21 while solderability meets the requirements of IEC 115-1, Clause 4.17.3.2. When reffering to marking , the serial number, resistance value and tolerance code are legend marked. The resistance value marking conforms to IEC 62. Solvent Resistance is that the glass envelope is coated with silicone and should not be subjected to solvents or their vapours.
     Finally , you should also pay attention to our application notes for safety.Each resistor is packed with a card stating nominal resistance value at 100 V applied, selection tolerance, date and serial number.Although the glass envelope is an excellent insulant and would be adequate in a dry atmosphere, the condensation which occurs in a normal atmosphere will provide a shunt resistance which will modify the very high resistance value. To minimise this effect all units are coated with silicone, and it is essential that this coating is not damaged; any handling should be by the terminations. For the same reason solvents must not be used .The resistors should not be used in a damp atmosphere. If moisture develops on the body the resistor should be dried for 30 minutes at 70°C and allowed to cool for a further 30 minutes in a dry atmosphere.To avoid damage to the seal between terminations and glass, the leads must be fully supported inside the point of bending
during any preforming.
      If you are willing to find more about the 3810 series, please pay attention to our web! Thank you for being concerned of our information.