A COMPANY OF MODELS RH and NH Wirewound Resistors DALE, Military, MIL-R-18546 Qualified, Type RE Aluminum Housed, Chassis Mount FEATURES SPECIAL MODIFICATIONS Standard winding (Model RH) Available upon request Non-inductive winding (Model NH) Special: Threaded mounting holes Molded construction for total environmental protection Housing configurations * Complete welded construction Resistance-temperature characteristic Mounts on chassis to utilize heat-sink effect Terminal configurations and materials High stability at conventional power ratings Resistances and tolerances Flat marking surface for easy identification Pre-conditioning MIL-R- POWER RATING RESISTANCE RANGE (Ohms) MAX. MAX. STANDARD TEMP. COEFFICIENT DALE 18546 (Watts) MIL. RANGE SHOWN IN BOLD FACE WORKING WEIGHT VALUE RANGES (Ohms)* MODEL TYPE DALE MILITARY .05%,.1% .25% 5% 1%, 3%,5% VOLTAGE (Grams) +50PPM +30PPM + 20PPM RH-5 RE60G 7.5 (5) 5 26-6.75k .05-24.5k .02-24.5k .02-24.5k 160 3 1-9.9 10-49 50-24.5k .10-3.32k NH-5 RE6ON 7.5 (5) 5 .26-3.4k .05-12.25k .05-12.25k = .05-12.75k 110 3.3 1-9.9 10-25 26-12.25k 1.0-1.65k RH-10 RE65G 12.5 (10) 10 16-12.7k .05-47.1k .01-47.1k_ .01-47.1k 265 6 1-9.9 10-79 80-47.1k .10-5.62k NH-10 RE65N 12.5 (10) 10 16-6.4k .05-23.5k .05-23.5k .05-23.5k 190 8.8 1-9.9 10-40 41-23.5k 1.0-2.8k RH-25 RE70G 25 20 16-25.7k .05-95.2k = .01-95.2k .01-95.2k 550 13 1-9.9 10-169 170-95.2k .10-12.1k NH-25 RE70N 25 20 16-12.8k .05-47.6k .05-47.6k .05-47.6k 390 16.5 1-9.9 10-85 86-47.6k 1.0-6.04k RH-50 RE75G 50 30 16-73.4k .064-273k .01-273k .01-273k 1250 28 1-9.9 10-469 470-273k -10-39.2k NH-50 RE75N 50 30 16-36.7k .064-136k .064-136k .05-136k 890 35 1-9.9 10-235 236-136k 1.0-19.6k RH-100 RE77G ~ 100 75 5-90k .1-90k .05-90k .05-90k 1900 400 1-99 100-949 950-90k .05-29.4k NH-100 RE77N 100 75 5-25k .1-25k .05-25k -.05-37.5k 1350 440 1-49 50-475 476-375k 1.0-14.7k RH-250 RE80G 250 120 5-116k = .1-116k A-416k = .05-116k 2300 800 1-99 100-999 1k-116k .10-35.7k NH-250 RE80N 250 120 5-37.5k 9 .1-37.5k .1-37.5k .05-48.5k 1625 880 1-49 50-499 500-48.5k 1.0-17.4k * 1 ohm to .99 ohm = + 100PPM. NOTE: All resistance ranges shown conform to military specifications unless otherwise indicated. Figures in parentheses on RH-5 and RH-10 indicate wattage printed. New construction allows these resistors to be rated at 7.5 and 12.5 watts, but they will be printed with these higher ratings only upon customer request. ELECTRICAL SPECIFICATIONS Resistance Tolerance: 3%, 1%, .5%, .25%, .10%, .05%. Operating Temperature Range: - 55C to + 275C. Derating is required for reduced chassis mounting area and for high ambient temperatures. (See Derating Curve.) Power Rating: Ratings are based on these requirements: 1. 275C maximum internal hotspot temperature. 2. 1% max. AR in 1000 hour load life for RH-5 thru RH-50. 3% max. AR in 1000 hour load life for RH-100 and RH-250. 3. Proper heat sink: 4x 6x 2x .040 aluminum chassis = 5 and 10 watt units. 5 x 7x2 x .040 aluminum chassis = 25 watt units. 12 x 12 x .059 aluminum panel = 50 watt units. 12 x 12 x .125 aluminum panel = 100 and 250 watt units. Dielectric Strength: 1000 VAC = 5, 10, 25 watt units. 2000 VAC = 50 watt units. 4500 VAC = 100, 250 watt units. Insulation Resistance: 10,000 Megohm minimum dry, 1,000 Megohm minimum after moisture test. MECHANICAL SPECIFICATIONS Terminal Strength: 5 |b. pull test = RH-5, NH-5, RH-10, NH-10. 10 Ib. pull test = RH-25 thru RH-250, NH-25 thru NH-250. Solderability: Satisfactory when tested in accordance with Method 208 of MIL-STD-202. MATERIAL SPECIFICATIONS Core: Ceramic steatite or alumina, depending on physical size. Element: Copper-nickel alloy, nickel-chrome alloy or manganese copper, depending on resistance value. End Caps: Stainless steel. Encapsulant: Silicone molded construction. Housing: Aluminum with hard anodic coating. Standard Terminals: Tinned Copperweld on 5 thru 50 watt units. Threaded terminals on 100 and 250 watt units. APPLICABLE MIL-SPECIFICATIONS MIL-R-18546: The military specification covering housed chassis-mounted power resistors. Dale RH and NH resistors meet or exceed the electrical, environmental and dimensional requirements of this specification. 52 DALE ELECTRONICS, INC., 1122 23rd Street, Columbus, NE 68601-3647 * Phone (402) 563-6506 * Fax 402-563-6418MODELS RH and NH | RH-5, -10, -25, -50 NH-5, -10, -25, -50 Cc | A F 1.88 + .031 [4.78 +787] TYP. _4 oa 770 + .015 [19.56 + .381] 4 K L TYPE A B c D E F G H J K L M N P RH-5 444 -490 .600 1.125 .334 646 .320 .065 133 -078 .093 .078 -050 .266 NH-5 +.005 | +.005 | +.031 | +.062 | 4.015 | +.015 | +.015 | +.010 | +.010 | +.010 | +.005 | +.015 | +.005 | +.062 [11.28 | [12.45 | [15.24 | [2858 | [a.48 | [16.41 [13 | [165 | [338 | [198 | [236 | [198 | [127 | [676 +.127] | +.127] | +.787] | 1.57] | +.381] | +.381] | +.381] | +.254] | +254] | +.254) | +.127] | +.381] | +.127] | 41.57] RH-10 562 625 -750 1.375 -420 -800 390 -075 -165 -093 .094 102 -085 -312 NH-10 + 005 + .005 + .031 + .062 +.015 + .015 +015 + .010 + .010 +.010 + .005 + .015 + .005 + .062 [14.27 [15.88 [19.05 [34.93 [10.67 (20.32 [9.91 [1.90 (4.19 [2.36 [2.39 [2.59 (2.16 [7.92 +127] | +.127] | +.787] | 1.57] | +.381] | +.381] | +.381] | +.254] | +254) | +.254) | +.127] | +.381] | +.127) | + 1.57] RH-25 719 781 1.062 1.938 -550 1.080 546 -075 .231 172 -125 115 .085 438 NH-25 | +.005 | +.005 / +.031 | +.062 | +.015 | +.015 | +.015 | +.010 | +.010 | +.010 | +.005 | +.015 | +005 | +.062 (18.26 } [19.84 | [26.97 | [49.23 | [13.97 | [27.43 | [13.87 [1.90 [5.87 [4.37 [3.18 (2.92 (2.16 | [11.13 +.127] | +.127] | +.787] | +1.57] | +.381] | +.381] | +.3814] | +254] | +.254) | +.254] | +.127] | +.381] | +.127] | +1.57] RH-50 1.562 844 | 1.968 2.781 .630 4.140 610 088 260 .196 125 107 085 .438 NH-50 | +.005 | +.005 | +.031 | +.062 | +.015 | +.015 | +.015 | +.010 | +.010 | +.010 | +.005 | +.015 | +.005 | +.062 [39.67 | [21.44 | [49.99 | [70.64 | [16.00 | [28.96 | [15.49 | [224 | [eso | [498] [ais | [272 | [ote | [41.13 +127] | +.127] | 4.787] | 1.57] | +.361] | +.381] | +.381] | + 254] ) +254] | +.254) | 4.127] | 4.381] | +.127) | 41.57] RH-100, NH-100 RH-250, NH-250 .188 + .010 ee [4.78 + 254] 1/4-20 Nickel Plated J! te eH Nickel Plated DIA. TYP. UNC-2A THD.TYP. Brass Nut 3.50 + .031 . ' Brass Nut _ q_ _ 4.50 + .034 Stainless Steel Stud [88.90 = .787] 1.125 + .031 Stainless Steel Stud [114.30 + .787] \ 4.25 + .031 + .787 [ 31.75 + .787 = 787] | fe) 4 f ' } 2.812+.031 _ 2.25 + .010 3.0 + 031 \ | 2.50 4.010 [71.42 + 787] 7 [57.15 + .254] [76.20 + .787] -atia AN (63.50 + 254) | | B75 +031 .989 + .031 Poy Thy : 25.12 + .787 .B75 + .010 <| 1.25+.031 12-24 eee t 1 <>! [22.23 + 254] [31.75 + .787] UNC-2A fo = rl |< 3.0+.010 > THD. TYP + 5.478 + .093 312 [76.20 + .254] . TYP. 1 [139.14 + 2.36] + 031 [7.92 |< 3.875+.010 +787] [98.42 + .254] 7.0 +.093 < >} [177.80 + 2.36] 1.812 +031 j}<__> 2.125 + 031 |<-_| [46.02 + 787] _| [53.98 + .787] 1.75 + .031 .955 + .015 ft [44.45 + .787] [24.26+.981} 2.188 + .031 [55.58 + .787] General: Testing is done according to the procedures and test methods described The following curves in MIL-R-18546. The table below shows the military and the Dale performance apply to operation of = Wi requirements. All specifications are based on testing of 1% tolerance units. unmounted resistors: E A=5 &10 watt units, oa MIL-R-18546 unmounted. 9 TEST REQUIREMENT TYPICAL CHANGE B = 25 watt units, EB unmounted. o Temperature Coefficient + 50PPM 200022 See Table C = 50, 100 & 250 re +30PPM over 20000 watt units, So 70 Thermal Shock +(.5% + 0.010) AR + (.25% + 0.019) AR unmounted. * 25 75 126 175 Short Time Overload +(.5% + 0.0192) AR (.25% + 0.019) AR D = All types mounted to aluminum chassis Dielectric + (.2% + 0.012) AR (1% + 0.010) AR 225 AMBIENT TEMP. DEG. CENTIGRADE 275 = =325 High Temperature Storage + (5% + 0.010) AR Heh I+ | I+ (25% + 0.019) AR Moisture Resistance + (1% + 0.010) AR + (5% + 0.019) AR Dale DALE: Shock (2% + 0.01Q)AR +(.1% +0.012) AR Model Load Life +(1%+0.01Q)AR + (.5% + 0.010) AR = Watteos tolerance Vibration +(2%+0.01Q)AR +(1% +0.012) AR Date code Terminal Strength + (.2% + 0.019) AR + (.1% + 0.019) AR MILITARY: Dale Model Value and tolerance Wattage Mil mark Date code DALE ELECTRONICS, INC., 1122 23rd Street, Columbus, NE 68601-3647 Phone (402) 563-6506 * Fax 402-563-6418 53