ELECTRICAL PARAMETERS

Resistance Values

Whilst E24 values are preferred, other values are available at no additional cost.

Resistance Tolerance

± 20%, ± 10% and ± 5% available as standard.

Resistivity Range - ρ

3 Ohm cm to 20000 Ohm cm

ρ = R x A/L,   where R = Resistance Value

Temperature Coefficient - TCR

-0.05% to -0.15% per °C Temperature Rise depending on Resistivity Value.

TCR = 0.16 x e ^{-(log ρ / 1.4)} - 0.135     (% / °C Temperature Rise)

Voltage Coefficient - VCR

-0.5% to -7.5% / kV / cm

VCR = -0.62 x ρ ^0.22   (% / kV / cm)

For ρ domain 10 to 7500 Ohm cm

Inductance

This is negligible (nH) and the Resistors may be described as non-inductive. In practice the inductance of connecting leads will be greater than that of the Resistors.

Maximum Working Voltages

The Maximum Working Voltage levels (V _working) can be derived from the appropriate formulae for each Resistor Type.

Waveforms are defined in the usual manner: 1.2/50 µs indicates a rise time to peak value in 1.2 µs and an exponential decay to half amplitude in a total time of 50 µs.