VCR – Voltage Coefficient of Resistance Technical Information
●Both voltages are free selectable. The unit of the VCR is „ppm/V“, but “%/V” is quite common too, whereby 1% correlates to 10,000 ppm.
●The resistance change at a given VCR is therefore as follows: R = R0 ( 1 + VCR * (V-V0))
●The voltage coefficient is commonly negative, i.e. the resistance is lower at higher measuring voltages (the reason are the conduction mechanisms in film resistors.
●With increasing resistance values the VCR values are increasing as well (at the same chip size).
●Contrary to that the VCR value is decreasing with increasing resistor sizes at the same resistance value (see graphic). Additional is to remark that the VCR is non-linear by itself, at higher measuring voltages the VCR values are lower.
●In practice the VCR values are only mattering at large voltage differences (V0-V; multiplier) as well as at high value resistors (high VCR-values).
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Datasheet |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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09/2006 |
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Issue 09/2006 |
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122 KB |
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