MODELS LVR-3 AND LVR-5 Wirewound Resistors DALE, Commercial, Precision Power, Low Value FEATURES * Ideal for all types of current sensing applications including switching and linear power supplies, instruments and power amplifiers Proprietary processing technique produces extremely low resistance values Excellent load life stability * Low temperature coefficient 175C maximum operating temperature Low inductance Cooler operation for high power to size ratio POWER RATING RESISTANCE RANGE* MAXIMUM WEIGHT MODEL (Watts) (Ohms) (Grams) LVR-3 3W ,005-.2 2 LVR-5 5W .005-.3 2 * Resistance must be measured 3/8" [9.52mm] from the body of resistor, or at a 1.315" [33.40mm] or 1.675" [42.545mm] spacing for the LVR-3 or LVR-5 respectively. ELECTRICAL SPECIFICATIONS Dielectric Strength: 500 VAC. Resistance Range: .005 ohm to .3 ohm. Values stocked Insulation Resistance: 10,000 Megohm minimum dry. at + 3% tolerance include: .005 ohm, .01 ohm, .015 ohm, g "y .02 ohm, .025 ohm, .03 ohm, .04 ohm, .05 ohm, .07 ohm Short Time Overload: 5 seconds at 5 times rated power. and .08 ohm. Resistance Tolerance: + 1%, + 3%, + 5%, + 10%. Lower MECHANICAL SPECIFICATIONS tolerances available as specials. Terminal Strength: 10 pound pull test = LVR-3, LVR-5. Temperature Coefficient: Measured from - 55C to+ 125C, Solderability: Satisfactory when tested in accordance referenced to + 25C. with Method 208 of MIL-STD-202. A 1.50 [38.10] MIN. A B c MODEL + 010 [.254] +.010 [.254] + 002 [.051] LVR-3 560 {14.22} .205 [5.20] 032 [.813} LVR-5 925 [23.50] 330 [8.38] 040 [1.02] DRALORIC ELECTRONIC GMBH, Geheimrat-Rosenthal-Str. 100, 95100 Selb, Germany Tel: (0)9287/710 + Fax: (0)9287/70435 52MODELS LVR-3 AND LVR-5 TEST MIL-R-49465 MAXIMUM UNITS Resistance-Temperature Characteristic (See chart) Parts/Million/C Maximum Ambient Temperature at Rated Wattage 25 Degrees Celsius Maximum Ambient Temperature at Zero Power 175 Thermal Shock + 0.2% . . Maximum percent change in Short Time Overload +0.5% resistance (.0005 ohm additional ; allowed for measurement error). Terminal Strength +0.1% Dielectric Withstanding Voltage + 0.1% Insulation Resistance 7.000MQ High Temperature Exposure + 1.0% Moisture Resistance + 0.2% Maximum percent change in resistance (.0005 ohm additional Low Temperature Storage + 0.2% allowed for measurement error). Shock, Specified Pulse +0.1% Vibration, High Frequency + 0.1% Lite + 2.0% Tolerance + 1%, +3%,+5% Percent 400 300 200 T.C. (PPM/C) LVR-5 The improved T.C. characteristics of this type LVR from - 55C to 125C (referenced to 25C) are as follows: 20 40 60 30 100 RESISTANCE (Q x 10) SURFACE TEMP. (C) 250 200 150 50 1 2 3C4 5 6 POWER WATTS 120 100 80 60 40 20 0 % OF RATED POWER 25 75 125 AMBIENT TEMP. DEG. CENTIGRADE 175 225 - Dale - Model Value - Tolerance ~- Date code LVR-3 MODEL 05 VALUE +1% TOLERANCE DRALORIC ELECTRONIC GMBH, Geheimrat-Rosenthail-Str. 100, 95100 Selb, Germany Tel: (0)9287/710 + Fax: (0)9287/70435 53