800 & 1000 Series Tubular High Energy Bulk Ceramic The Ohmite Ceramic Resistor Division Tubular Non- Inductive Bulk Ceramic Resistors provide excellent per- formance for high peak power or high-energy pulses. Bulk construction advantageously produces an inher- ently non-inductive resistor and it allows energy and power to be uniformly distributed through the entire ceramic resistor body there is no film or wire to fail. Ohmite offers a full line of rugged, reliable ceramic resistors. Ohmite offers three distinctly different ceramic mate- rials to allow designers to meet the most demanding requirements. Ma Terial TypeS Type Sp Type aS Type Ba Material composition type SP Material composition type AS Material composition type A is is formulated to withstand high is formulated to withstand high formulated with to reach higher operating temperatures result- energy and high voltage appli- resistance values. Maximum con- ing in high power dissipation. cations. Maximum continuous tinuous operating temperature is Maximum continuous operating operating temperature is specified specified at 230 C. The standard temperature is specified at 350C. at 230C. The standard dielectric dielectric coating is recommended This type is suitable for use in oil coating is recommended for use for use in air, and the oil-resistant without an oil-resistant coating. in air, and the oil-resistant coating coating is recommended for use is recommended for use in oil. in oil. Appplications Appplications Appplications Motor drive circuits Impulse generators Bleeder Snubber circuits High-voltage circuits Capacitor charge/discharge High-frequency circuits X-ray equipment RF dummy loads High voltage power supplies Dynamic braking Laser/Imaging equipment Transformer protection Capacitor charge/discharge Harmonic filter (continued) 138 1-866-9-OHMITE Intl 1-847-258-0300 Fax 1-847-574-7522 www.ohmite.com info ohmite.com800 & 1000 Series Tubular High Energy Bulk Ceramic Specifica TionS Length x Resistance Avg. Power Peak* Peak* Series 800 and 1000 Tubular Type Diameter Min. Max. 40C (W) Energy (J) Voltage** (V) Resistors are available in a 884SP 2 x 1/2 1.0 200 22.5 250 1,000 wide variety of sizes and ter- 885SP 2 1/2 x 3/4 1.0 130 45 250 1,000 minations from 2 to 24 in 885AS 6.0 1200 15 2,800 8,000 length and to 2 in diameter. 885A 1500 220K 15 750 3,750 These resistors can handle up 886SP 5 x 3/4 1.0 330 90 500 4,000 to 1000 watts, 165 kJ and 165 886AS 15.0 3300 30 7,000 20,000 kV in resistance values from 1 886A 3900 390K 30 1,500 10,000 ohm to 1 megohm. 887SP 6 x 1 1.0 330 150 1,600 4,000 887AS 12.0 3300 50 13,000 30,000 * Allowable peak energy/voltage will depend on 887A 3900 390K 50 6,000 12,000 the resistance value. Consult factory. 1026AS 6 x 1 1/2 5.0 1200 70 30,000 30,000 ** Derate by 50% with oil resistant coating on Type AS resistors. Energy ratings are based 888SP 8 x 1 1.0 390 190 2,100 6,000 on pulses <10 milliseconds. Type SP ratings can be substantially greater for longer pulses. 888AS 15.0 3900 75 16,500 45,000 Consult factory. 888A 4700 470K 60 7,500 15,000 1028AS 8 x 1 1/2 6.5 1900 100 46,000 45,000 889SP 12 x 1 1.0 680 275 3,200 10,000 889AS 25.0 6800 100 27,000 75,000 889A 8200 680K 90 12,500 25,000 1032AS 12 x 1 1/2 9.0 2500 150 75,000 75,000 890SP 18 x 1 1.0 1000 375 4,200 16,000 890AS 40.0 10K 150 43,000 120,000 890A 12K 1M 125 20,000 40,000 1038AS 18 x 1 1/2 15.0 3800 225 119,000 120,000 891SP 18 x 2 1.0 450 750 15,000 16,000 892SP 24 x 2 1.0 600 1000 17,500 22,000 1044AS 24 x 1 1/2 20.0 4800 300 164,000 165,000 characTeriSTicS Characteristic Test Type SP Type AS Type A Operating Temp. -55C to +350C* -55C to +230C -55C to +230C Resistance Temp. +0.2 to -0.08 %/C +0.0 to -0.08 %/C +0.0 to -0.2 %/C Coefficient (+ 2000 ppm - 800 ppm) (+ 0 ppm - 800 ppm) (+ 0 ppm - 2000 ppm) Voltage Coefficient Max. % per kilovolt per inch -1.0% -1.0% - active length Short Time Max. % change after 10 5% 2% - Overload cycles of 1000% rated power 5 sec. On, 90 sec. Off Max. % change after 1,000 5% 5% - Load Life hours at rated power Thermal Shock Max. % change after 10 3% 3% - cycles -55C to +125C Moisture Max. % change when tested 5% 5% 5% Resistance per MIL-STD-202, Method 103 2.2-2.4 gm/cc 2.2-2.6 gm/cc 2.2-2.6 gm/cc Density Specific Heat 0.24-0.26 cal/gm -C 0.23-0.25 cal/gm -C 0.23-0.25 cal/gm -C Thermal 0.14-0.16 cal/(cm-C-sec) 0.003-0.006 cal/(cm-C-sec) 0.003-0.006 cal/(cm-C-sec) Conductivity *When required, Type SP material can withstand short periods of use at red-heat conditions, i.e. up to 550C to 600C Ceramic Resistor Division 1-866-9-OHMITE Intl 1-847-258-0300 Fax 1-847-574-7522 www.ohmite.com info ohmite.com 139