High Voltage Low Inductance

Thick film Resistors

HVL Series

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Issue B · 03.02

Welwyn Components

198

Matched Sets

Resistors in a set can be supplied for use as precision

voltage dividers matched for tolerance and TCR down to

0.5% and 10ppm/°C.

ENQUIRIES ARE WELCOMED FOR SPECIAL RESISTORS AND

SETS

Application Notes

Mounting

Due to the high voltage which can appear between the end

cap and any adjacent metal part, resistors should be mounted

at an adequate distance from other conductors.

For some high voltage applications it is required to immerse

the components in oil or gas to reduce the effects of corona

and surface tracking. The protective coating is suitable for

these applications.

The axial termination should not be bent closer than twice

the diameter of the terminal wire from the body of the

resistor.

When the resistors are required to be plotted, the preferred

encapsulant is a silicone compound.

For voltage dividers with a low resistance section below the

minimum available value of 1k ohms, it is normal practice to

use a Welwyn resistor, RC Series, obtainable down to 1ohm.

Packaging

Resistors are supplied packed in boxes.

Standard Quantities Per Box

All Types

10 or 20 per box

Maximum

Typical

Load at rated power: 1000 hours at 70°C

∆R%

1

0.3

Shelf life: 12 months at room temperature

∆R%

0.3

0.1

Derating from rated power at 70°C

Zero at 155°C

Noise (in a decade of frequency)

µV/V

5

<2.5

Voltage coefficient of resistance

ppm/volt

5

<1

Performance Data