↓ RESISTANCE STANDARDS ULTRA STABLE 1.5 [38] Model A1B ← 2” [50.8] → A SERIES RoHS Term.W is RoHS compliant RESISTORSCAPACITORSCOILSDELAY LINES Model A2 → ↑ ← .75 [19] 5.5 [140] Dimensions Inch [mm] Designed for use as DC Resistance Standards in industrial, research, and metrology laboratories Standards are individually tested and certified to the National Institute of Standards and Technology Accuracies to ±0.0005%! Choice of models: A1 offers utmost precision and stability for ‘primary standard’ applications, A2 offers economical ‘secondary standard’ performance Values from 0.01Ω to 1MΩ are standard (any decade or intermediate value can be offered on a custom basis from 0.001Ω to 1013Ω, consult factory) Low thermal EMF and voltage coefficients RCD standards lab offers recalibration services Low temperature coefficient (approx. 10ppm/°C) Operating temperature: 0°C to +40°C Low cost 2-terminal banana plug standards avail. ← ↓ RCD A2 SN 1060 100 OHM 4.5 [114] → ↑ 2.5 [63.5] ↓ 1.25 [31.8] ↑ RCD - The standard by which others are measured! RCD has been manufacturing precision resistors for more than 30 years, which have evolved into some of the most precise and stable standards available worldwide, up to 10 times more accurate than competitive models! Series A1: Made of premium resistance wire, wound on insulated brass spools for precise matching of TCE, and pre-conditioned to assure utmost stability. The element is immersed in moisture-free oil inside a sealed metal container. Available in two grades, A1A to ±0.0005% and A1B to ±0.001%. A1A standards are not only traceable to the NIST, but also include a computerized TC chart giving corrections for every 0.01°C from 18 to 30°C. Series A1 are provided with a thermometer well at the center of the standard. As an option, a 100Ω platinum RTD element (RCD type PTF1 accurate to 0.1°C) can be imbedded in the midst of the resistance windings. Heavy duty leads enable series/parallel connections without compromising the guaranteed limit of error. Series A2: Precision resistors with 4-terminal brass binding posts designed for less critical applications such as secondary reference standards. Molded lowprofile case with flexible internal insulation protects the resistance element from damage even when exposed to non-laboratory environments, such as production or R&D departments. Gold plated binding posts available. A1 SPECIFICATIONS Resistance Value Measured Value Resolution Accuracy of Measured Value* A1A A1B 0.0000001Ω 5ppm 10ppm 1.0W 0.000001Ω 3ppm 10ppm 0.00001Ω 4ppm 0.00001Ω Nom. Tolerance A1A 0.1Ω ±0.005% 1.0Ω ±0.0005% 10Ω ±0.0005% 50Ω N/A 100Ω ±0.0005% 400Ω N/A 1KΩ ±0.0005% 10KΩ ±0.0005% A1B ±0.05% (.01% avail) ±0.003% (.001% avail) ±0.003% (.001% avail) ±0.003% (.001% avail) ±0.003% (.001% avail) ±0.003% (.001% avail) ±0.003% (.001% avail) ±0.003% (.001% avail) Wattage Rating Current Rating Long Term Stability** Power Coef.* (ppm/mW) A1A A1B A1A A1B 3.2A 1-5ppm 2-10ppm .002 .010 1.0W 1.0A 0.5-3ppm 1-5ppm .001 .005 10ppm 1.0W .32A 0.5-3ppm 1-5ppm .001 .005 - 10ppm 1.0W .14A N/A 1-5ppm N/A .005 0.0001Ω 4ppm 10ppm 1.0W .1A 0.5-3ppm 1-5ppm .001 .005 0.0001Ω - 10ppm 1.0W .05A N/A 1-5ppm N/A .005 0.001Ω 5ppm 10ppm 1.0W .032A 0.5-3ppm 1-5ppm .001 .005 0.01Ω 7ppm 10ppm 1.0W .01A 0.5-3ppm 1-5ppm .001 .005 HOW TO ORDER: A2 SPECIFICATIONS Resistance Value Nominal Tolerance Measured Value Resolution Accuracy Wattage Current Long Term Pow er Coef. of Meas. Rating Rating Stability** (ppm/mW) * Value* 0.01Ω ±0.05% (.01% avail) 0.000001Ω 200ppm 1.0W 10A 20-100ppm 0.5 0.1Ω ±0.03% (.01% avail) 0.00001Ω 50ppm 1.0W 3.2A 10-50ppm 0.3 1.0Ω ±0.01% (.005% avail) 0.0001Ω 20ppm 1.0W 1A 5-25ppm 0.3 10Ω ±0.01% (.005% avail) 0.001Ω 20ppm 1.0W .32A 5-25ppm 0.1 50Ω ±0.01% (.005% avail) 0.001Ω 20ppm 1.0W .14A 5-25ppm 0.1 100Ω ±0.01% (.005% avail) 0.001Ω 20ppm 1.0W .1A 5-25ppm 0.1 400Ω ±0.01% (.005% avail) 0.001Ω 20ppm 1.0W .05A 5-25ppm 0.1 1K Ω ±0.01% (.005% avail) 0.01Ω 20ppm 1.0W .032A 5-25ppm 0.1 10K Ω ±0.01% (.005% avail) 0.1Ω 20ppm 1.0W .01A 5-25ppm 0.1 100K Ω ±0.01% (.005% avail) 1.0Ω 50ppm 1.0W .0032A 5-25ppm 0.1 1MΩ ±0.01% (.005% avail) 10.0Ω 200ppm 1.0W .001A 10-50ppm 0.1 Standards can be ordered as complete sets or individually. SET-A1A has six A1A standards (0.1Ω, 1Ω, 10Ω, 100Ω, 1K, 10K). SET-A1B has eight A1B standards (0.1Ω, 1Ω, 10Ω, 50Ω, 100Ω, 400Ω, 1K, 10K). SET-A2 has eleven A2 standards (0.01Ω, 0.1Ω, 1Ω, 10Ω, 50Ω, 100Ω, 400Ω, 1K, 10K, 100K, 1M). Order individual standards by denoting the model number and value, e.g. “A1A - 1 OHM”, “A1B - 10K”, “A2 -1M”. Indicate non-standard tolerances, e.g. “A2 - 1 OHM .005%”. Lead-free RoHScompliant design is available by adding “W” to end of p/n. Custom values are available. * Tested at 25±0.05°C in a well stirred oil bath at <100mW (5ppm=.0005%, 10ppm=.001%, etc.) **Typical stability under conditions of normal use over 1 year period. RCD Components Inc, 520 E.Industrial Park Dr, Manchester, NH, USA 03109 rcdcomponents.com Tel: 603-669-0054 Fax: 603-669-5455 Email:[email protected] FA044A Sale of this product is in accordance with GF-061. Specifications subject to change without notice. 58