Ultra-High Value Ultra-High Value Ultra-High Value Welwyn Components Precision Resistors Welwyn Components Precision Resistors Precision Resistors 3810 Series 3810 Series 3810 Series s Resistance range up to 100 T ohms 14 14 Resistance range up to 100 T ohms (10 ohms) (10 ohms) s Resistance range up to 100 T ohms 14 Designed for low current (10 ohms) Designed for low current (picoampere level) s (picoampere level) measurements Designed for low current (picoampere level) measus rements Low voltage coefficient measurements Low voltage coefficient s Hermetically sealed Low voltage coefficient s Hermetically Leakage curr sealedent minimised by hermetic s Hermetically sealed s sealing and guard ring Leakage current minimised by hermetic s Leakage current minimised by hermetic s sealing and guard ring sealing and guard ring Electrical Data Electrical Data 3810 3811 3812 3810 3811 3812 Resistance range ohms 100M to 1T 100M to 1T 1T to 100T Resistance range ohms 100M to 1T 100M to 1T 1T to 100T Limiting element voltage volts 500 1000 1000 Limiting element voltage volts 500 1000 1000 TCR (20C to 70C) ppm/C -500 to -3500 TCR (20C to 70C) ppm/C -500 to -3500 Resistance tolerance % 10, 20 1, 2, 5, 10 1T to10T 2, 5,10 >10T 5,10 Resistance tolerance % 10, 20 1, 2, 5, 10 1T to10T 2, 5,10 >10T 5,10 Values E24 preferred Values E24 preferred Ambient temperature range C -40 to 100 Ambient temperature range C -40 to 100 Physical Data Physical Data Dimensions (mm) & Weight (g) PCB Min. Dimensions (mm) & Weight (g) Type L max D max f min d nom mounting Bend Wt. nom PCB Min. Centres Radius d Type L max D max f min d nom mounting Bend Wt. nom D 3810 25.0 6 30 0.6 29.2 0.6 1.5 L Centres Radius f d 3811 42.9 6 30 0.6 47.1 0.6 2.2 D 3810 25.0 6 30 0.6 29.2 0.6 1.5 L f 3812 48.0 6 30 0.6 52.2 0.6 2.5 3811 42.9 6 30 0.6 47.1 0.6 2.2 3812 48.0 6 30 0.6 52.2 0.6 2.5 Construction Marking The Cermetox resistive film is fired onto high quality ceramic The serial number, resistance value and tolerance code are legend substrate brass end caps are forced fitted to the substrate marked. The resistance value marking conforms to IEC 62. Construction Marking which is then adjusted to value with a helical cut in the film The Cermetox resistive film is fired onto high quality ceramic The serial number, resistance value and tolerance code are legend the leads are mechanically locked into the end caps and the Solvent Resistance substrate brass end caps are forced fitted to the substrate marked. The resistance value marking conforms to IEC 62. assembly sealed into the glass envelope. All close tolerance The glass envelope is coated with silicone and should not be which is then adjusted to value with a helical cut in the film units utilise two resistors connected in series within the glass subjected to solvents or their vapours. (See Application the leads are mechanically locked into the end caps and the Solvent Resistance envelope. The guard band is described, with application Notes.) assembly sealed into the glass envelope. All close tolerance The glass envelope is coated with silicone and should not be notes, in a Product Information sheet, available on request. units utilise two resistors connected in series within the glass subjected to solvents or their vapours. (See Application envelope. The guard band is described, with application Notes.) Terminations notes, in a Product Information sheet, available on request. Material Solder-coated Dumet wire. Strength The terminations meet the requirements of Terminations IEC 68.2.21 Material Solder-coated Dumet wire. Solderability The terminations meet the requirements of Strength The terminations meet the requirements of IEC 115-1, Clause 4.17.3.2 IEC 68.2.21 General Note General Note SolderabilityWelwyn ComponentsThe reserves terminations the right to make meet changes the in prrequioduct rspecificationements ofwithout notice or liability. TT electronics reserves the right to make changes in product specification without notice or liability. All information is subject to Welwyns own data and is considered accurate at time of going to print. A subsidiary of IEC 115-1, Clause 4.17.3.2 All information is subject to TT electronics own data and is considered accurate at time of going to print. TT electronics plc www.bitechnologies.com www.irctt.com www.welwyn-tt.com Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK Telephone: +44 (0) 1670 822181 Facsimile: +44 (0) 1670 829465 Email: info welwyn-tt.com Website: www.welwyn-tt.com Issue D 03.06 TT electronics plc General Note 10. 11 Welwyn Components reserves the right to make changes in product specification without notice or liability. 203 All information is subject to Welwyns own data and is considered accurate at time of going to print. A subsidiary of TT electronics plc Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK Telephone: +44 (0) 1670 822181 Facsimile: +44 (0) 1670 829465 Email: info welwyn-tt.com Website: www.welwyn-tt.com Issue D 03.06 203Ultra-High Value Ultra-High Value Precision Resistors Precision Resistors 3810 Series Welwyn Components 3810 Series Performance Data aMxi T py ical Load at rated voltage: 1000 hours at 20C %R 2 1 Shelf life: 12 months at room temperature %R 1 Resistance to solder heat %R < Fp Capacitance Fp Voltage coefficient of resistance ppm/volt 100M 1T 100T Measured at voltages 3810 -20 -160 of 100 and 500 volts 3211 -10 -80 -150 3812 -10 -80 -150 Application Notes Each resistor is packed with a card stating nominal resistance Guard Band value at 100 V applied, selection tolerance, date and serial For details of how to use the guard band, fitted to resistors of number. 100 G ohms and over, ask for Product Information Sheet detailing application notes for glass sealed resistors with Although the glass envelope is an excellent insulant and guard band. would be adequate in a dry atmosphere, the condensation which occurs in a normal atmosphere will provide a shunt Non-standard versions resistance which will modify the very high resistance value. To Units without glass envelopes but with lacquer protection are minimise this effect all units are coated with silicone, and it is available, but will have a limited electrical performance. essential that this coating is not damaged any handling should be by the terminations. For the same reason solvents Measured values at a voltage other than 100V may be must not be used. recorded. The resistors should not be used in a damp atmosphere. If For non-standard items contact Welwyn Components. moisture develops on the body the resistor should be dried for 30 minutes at 70C and allowed to cool for a further 30 Packaging minutes in a dry atmosphere. Each resistor is individually packed in a polythene envelope together with a card carrying measurement details and serial To avoid damage to the seal between terminations and glass, number (See Application Notes). the leads must be fully supported inside the point of bending during any preforming. Ordering Proced ure Example: 3812 at 10 teraohms and 2% tolerance - 3 8 1 2 1 0 T G I Type Value (use IEC62 code) Tolerance (use IEC62 code) F 1% J 5% G 2% K 10% Packing I Individual/Bulk Standard Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK General Note Telephone: +44 (0) 1670 822181 Facsimile: +44 (0) 1670 829465 Email: info welwyn-tt.com Website: www.welwyn-tt.com Issue D 03.06 TT electronics reserves the right to make changes in product specification without notice or liability. 204 All information is subject to TT electronics own data and is considered accurate at time of going to print. www.bitechnologies.com www.irctt.com www.welwyn-tt.com TT electronics plc 10. 11 2.0 1183 4.0 0183 1.0 2.0 5.0 mum