- Greater "Stability vs. Time"
- Dependable and repeatable measurements year-after-year
- Offer the stability & performance of secondary standards
More Ultra-Precision Features:
- Select Any Value - custom to your specs exactly - from 0.1 ohm to 10 Mega-Ohms ... with tolerances from 1% to 0.005%. We offer the widest range anywhere, especially when you need decimal part of an ohm accuracies.
- The Standard TCR is 5ppm - however, if you need something closer, special TCRs to 1ppm per degree C. are available.
- Ultra Stability vs. Time - probably your most important consideration - can be conditioned to 0.001% per year.
- Wide Temperature Span - from -65°C. to +125°C. ... derated to zero wattage at +145°C.. Other technologies are limited to +70°C., which can be a problem in your soldering processes.
- Axial or SMD - designs are available ... it's your choice!
- Special Custom Flexibility - when you need matching TCRs and tolerances with part-to-part repeatability.
- Non-inductive - All HR & RX standard parts are non-inductive (suffix "N") except the HR103
The TCR Characteristic is the proportional variation in resistance with respect to a change in temperature. This change is expressed in either: parts per million (ppm), percent (%), or ohms/ohm ... per 1°C.
For Example: A 1KΩ resistor with a TCR characteristic of 0±5 ppm/°C. (Std. on the Type RX/HR) ... is multiplied by 0.000005Ω or ±0.005 ohms change per 1°C.
ULTRA-PRECISION WIRE WOUND RESISTOR PDF SPEC SHEET