RS925D

RS925D IET | Alldatasheet

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Technical content

(esi) Decade Resistance Substituter Features:

• High accuracy - 20 ppm
• High stability - 5 ppm/yr
• Low temperature coefficient - as low as 3 ppm/°C
• High-performance, solid silver contact switches
• Resistance from 10 mΩ to over 1.21 MΩ
• 20 µΩ resolution rheostat
• Hermetically sealed, low inductance resistors
• Precise fixed minimum resistance RS925D data sheet/12-27-12 For high-resolution applications, a 10 mΩ rheostat is used for the lowest step. It is a 20 µΩ resolution “decade”. In order to eliminate contact resistance and thermal emf, the RD925D integrates the rheostat as shown. In this way, the wiper is in the low potential circuit, which is the high impedance lead. As a result, voltage and contact resistance effects are removed by being effectively added to the input impedance of the measuring instrument. RHEOSTAT RS925D KELVIN BRIDGE MEASUREMENT HI SENSE HI CURRENT LO SENSE LO CURRENTDISCRETE DECADES RHEOSTAT SPECIFICATIONS Resistance per step Total decade resistance Max current Max power Temperature coefficient (±ppm/ºC) Power coefficient (±ppm/mW) Stability (±ppm/yr) Decade positions Resistor type whichever applies first 100 µΩ division 20 µΩ resolution 10 mΩ 2 A NA 20 1 20 ppm+0.5 mΩ Continuous Rheostat 10 mΩ 100 mΩ 2 A NA 20 1 10 positions "1"-"10" (10 mΩ minimum reading Resistance wire 100 mΩ 1 Ω 2 A NA 20 1 11 positions "0"-"10" 1 Ω 10 Ω 1 A 5 W 20 0.4 Wirewound hermetically sealed low-inductance 10 Ω 100 Ω 0.33 A 5 W 10 0.3 100 Ω 1 kΩ 0.1 A 5 W 3 0.1 1 kΩ 10 kΩ 33 mA 5 W 3 0.1 10 ppm (<5 ppm typical)10 kΩ 100 kΩ 10 mA 5 W 3 0.1 100 kΩ 1 MΩ 3 mA 2,000 V peak 3 0.1 12 positions "0"-"11" Wiring and switch resistance NA 50 µΩ/ºC 0.2 µΩ/W NA Accuracy: ±(20 ppm+0.5 mΩ) At 23°C "true ohm" measurement, 30-70% RH, absolute reading, SI traceable No zero subtraction required Minimum resistance: 10 mΩ ± 0.5 mΩ; determined by the lowest settable position, “1”, of the 10 mΩ/step decade Resistance repeatability: Better than 100 µΩ, short-term, average value Leakage Resistance: >10 GΩ Environmental Conditions: Operating Temperature: 0°C to 55°C Storage Temperature: -40°C to 70°C Switch Type: Multiple solid silver contacts; dust-tight diallyl-phthalate body. To allow continuous rotation, a blank position is added on most decades. Terminals: Four, 5-way, gold-plated, tellurium-copper binding posts with low thermal emf and low resistance, for four-terminal Kelvin measurements, plus one binding post connected to case for shielding. Rear outputs are available as an option. Mechanical Information: Dimensions: 48.3 cm W x 17.8 cm H x 19.7 cm D (19" W x 7" H x 7.8" D) Weight: 5.1 kg (11 lb) The IET (esi) RS925D is a four-terminal, continuously variable decade resistor for the most exacting calibration and test applications.