RHOPOINT COMPONENTS LTD MINIOHM (5E10) Precision Wirewound Resistor SPECIFICATIONS Miniohms are only 7.94mm long with a diameter of 3.97mm, yet they incorporate advanced design and manufacturing features which provide unsurpassed accuracy, stability, load life and reliability. Each Miniohm undergoes three separate complete tests during manufacture including an accelerated ageing thermal shock procedure. FEATURES Miniature size Temperature co-efficient 3ppm per C Full load stability 50ppm maximum after three years Tolerance 0.01% and 0.1% OHMIC VALUES Miniohms are available in 78 standard values from 10 to 100K and in any `non-standard' value from 10 to 200k. CONSTRUCTION Miniohms are made in an identical way to Econistors, incorporating the same all-welded construction. For a full description please refer to the notes and diagrams on the previous page. Temperature Co-efficient: Tolerance at 25C: 3ppm/C typical over 0C to +85C 0.01%, 0.1% 5ppm maximum over -55C to +125C Full Load Stability: 35ppm/10,000hours 50ppm/26,000 hours No Load Stability: 25ppm/10,000hours over full temperature range; -55C to +125C 35ppm/26,000 hours Power Rating: Noise: 0.2 watt (+85C) Essentially nonmeasurable 0.14 watt (+110C) Maximum Voltage: Encapsulation: 175V DC or AC peak Moulded epoxy Thermal EMF: Leads: <0.4V/C typical 24 AWG tinned copper Windings: Balanced multiple for low reactance. Exclusive `air cushion' technique provides virtually stressless elements for improved performance. Noninductively wound. Direction of winding reversed at half turns point. Thermal EMFS The temperature difference between the two copper to resistance wire joins is the critical factor. If the two junctions are at the same temperature, then the effect of thermal EMFs is minimised. The construction of Miniohms is such that the two junctions are not more than 2mm apart, thus reducing any possibility of temperature difference almost to zero. This largely negates the effect of thermal EMFs in Miniohms. The thermal EMF of the resistance material to copper join for Miniohms is typically <0.4V/C. } Stocked in 0.1% and 0.01% in listed values shown below 10 20 30 40 50 60 62.5 70 80 90 100 120 125 150 * * * 180 200 220 250 270 300 330 350 390 400 470 500 560 600 * * * * * * * 680 700 800 820 900 1.0 1.2 1.5 1.8 2.0 2.2 2.5 2.7 3.0 * * K K* K K* K K* K K* K 3.3K 3.9K 4.0K 4.7K 5.0K 5.6K 6.0K 6.8K 7.0K 8.0K 8.2K 9.0K 9.9K 10.0K * * * * * * * 12K 15K 18K 20K 22K 25K 27K 30K 33K 39K 40K 47K 50K 56K * * * 60K 68K * 70K 80K 82K * 90K 99K * 100K * * * * Any non-listed value from to 200K 10 available to order * * Stocked in 0.1% tolerance only. ORDERING PROCEDURE EXAMPLE: 5 E 10 I Style and general specifications A I Tolerance A = 0.01% D = 0.1% 10 K I R value in Ohms Matched pairs and ratio matched resistors are available against specific enquiries. 4