WELWYN HVL

High Voltage Low Inductance
Thick film Resistors
Welwyn Components
HVL Series
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•
•
•
•
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Working voltage up to 48kV
Low inductance
Resistance up to 4G
Low temperature coefficient of resistance
Low voltage coefficient
Sets of resistors with matched characteristics
Electrical Data
HVL 43
HVL 44
HVL 45
Power rating at 70°C
watts
1.5
3.5
5.0
Resistance range
ohms
1K to 1G
1K to 2G
1K to 4G
volts
4K
14K
24K
In air
8K
28K
48K
In oil
Limiting element voltage
TCR (20°C to 70°C)
ppm/°C
Resistance tolerance
%
Values
Thermal impedance
°C/watt
Notes
25, 50, 100
Values >1G: TCR is 250ppm/°C
1, 2, 5
Closer tolerances over restricted range
E24 preferred values
Any value to special order
31
Ambient temperature range
27
20
-55 to 155
Physical Data
Dimensions (mm) and Weight (g)
L max.
D max.
f min.
d nom.
PCB
mounting
centres
HVL 43
25.4
8.0
30
0.8
31.8
1.2
3.1
HVL 44
50.8
8.0
30
0.8
57.2
1.2
5.6
HVL 45
84.2
8.0
30
0.8
87.2
1.2
5.6
Type
Min.
bend
radius
Wt.
nom.
d
D
L
f
Construction
Marking
A ruthenium oxide based resistive film is fired onto a high
quality ceramic former. Cap and lead assemblies are force
fitted to the former. The resistor is adjusted to value and the
body is protected with a silicone coating.
Type reference, resistance value, tolerance and date code are
legend marked. The resistance value conforms to IEC 62.
Terminations
Material
Solder coated copper wire.
Strength
The terminations meet the requirements of
IEC 68.2.21.
Solvent Resistance
The body protection and marking are resistant to all normal
industrial cleaning solvents suitable for printed circuits.
Solderability The terminations meet the requirements of
IEC 115-1, Clause 4.17.3.2.
General Note
Welwyn Components reserves the right to make changes in product specification without notice or liability.
All information is subject to Welwyn’s own data and is considered accurate at time of going to print.
A subsidiary of
TT electronics plc
© Welwyn Components Limited · Bedlington, Northumberland NE22 7AA, UK
Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: [email protected] · Website: www.welwyn-tt.com
Issue B · 03.02
197
High Voltage Low Inductance
Thick film Resistors
Welwyn Components
HVL Series
Performance Data
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
Noise (in a decade of frequency)
µV/V
5
<2.5
Voltage coefficient of resistance
ppm/volt
5
<1
Derating from rated power at 70°C
Zero at 155°C
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
Packaging
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.
Resistors are supplied packed in boxes.
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.
Standard Quantities Per Box
All Types
10 or 20 per box
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.
© Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK
Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: [email protected] · Website: www.welwyn-tt.com
198
Issue B · 03.02