High Voltage
Thick film Resistors
HV Series
Welwyn Components
Performance Data
Maximum
Load at rated power: 1000 hours at 70°C
Shelf life: 12 months at room temperature
Derating from rated power at 70°C
Noise (in a decade of frequency)
Voltage coefficient of resistance
µV/V
ppm/volt
5
5
∆R%
∆R%
1
0.3
Zero at 155°C
<2.5
<2
Typical
0.3
0.1
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 potted, 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
© Welwyn Components Limited
Bedlington, Northumberland NE22 7AA, UK
Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
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Issue B · 03.02
WELWYN [ WELWYN COMPONENTS LIMITED ]
