T48KU [TTELEC]

High Voltage Precision Thick Film Resistors; 高压精密厚膜电阻器


型号：	T48KU
厂家：	TT Electronics
描述：	High Voltage Precision Thick Film Resistors 高压精密厚膜电阻器电阻器膜电阻器高压
文件：	总2页 (文件大小：164K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

High Voltage Precision

Thick Film Resistors

Welwyn Components

T Series

• Working voltage up to 100kV

Resistances up to 50G

•

TCR down to 25ppm

•

Termination variants

•

Sets of resistors with matched characteristics

•

Electrical Data

T43

T44

3.5

T48

Notes

Power rating at 20°C

Resistance range

watts

ohms

volts

1.5

1K to 10G

1K to 50G

14K

1K to 50G

50K

Limiting element voltage

In air

28K

100K

In oil

TCR

ppm/°C

25, 50, 100

1, 2, 5

Values > 1G: TCR is 250ppm/°C

Closer tolerances over restricted range

Any value to special order

Resistance tolerance

Values

E24 preferred values

Thermal impedance

Ambient temperature range

°C/watt

°C

-55 to 150

Physical Data

Dimensions (mm) & Weight (g)

PCB

Min

mounting

centres

Bend

Type

L max

25.4

D max

8.4

8.5

f min

32.0

d nom

0.8

Radius Wt. nom

T44D

T43D

31.8

57.2

1.2

3.1

5.6

T44D

50.8

0.8

T48D

150.0

30.2

0.8

156.4

18.5

3.9

T43KU

T44KU

T48KU

T43TU

T44TU

T48TU

0.8

T44TU

T44KU

53.2

0.8

7.4

152.2

32.6

0.8

19.3

5.8

55.6

8.2

154.8

20.2

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

Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com

Issue B · 03.02

193

High Voltage Precision

Thick Film Resistors

T Series

Welwyn Components

Solderability:

The terminations meet the requirements

of IEC 115-1, Clause 4.17.3.2.

Construction

A ruthenium oxide based resistive film is fired onto the

surface of a high quality former. Turned brass end caps are

fitted. A Helical cut is made into the film to adjust its resistive

value and finally a protective sleeve is fitted to provide

mechanical protection and electrical insulation. Resistors for

use in oil or SF6, can be supplied with a lacquer protection

instead of the sleeve.

Screw Terminations: Styles TU and KU.

Material:

Turned brass.

Screw Thread:

All caps are tapped UNF – 10 x 4.2 deep.

UNF – 10 is 32 TPI, 60°C thread angle,

4.72 0.07 mm outside diameter, 3.83

mm core diameter.

Terminations

Coupling Stud:

All KU & TU resistors are supplied with 8

mm long screwed brass studs.

Three styles of termination are available to permit resistors to

be screwed together in a series chain, with the end members

having axial wires for soldering.

Wire Terminations: Styles D and KU.

Non standard terminations available upon

request.

Marking

Type reference, resistance value, tolerance and date code are

legend marked. The resistance value conforms to IEC 62.

Solvent Resistance

Material:

Strength:

Solder coated copper wire.

The lacquer and the protective sleeve provide excellent

resistance to all normal industrial cleaning solvents suitable for

printed circuits.

The terminations meet the requirements

of IEC 68.2.21

Performance Data

Maximum

≤ IG:3, >IG:5

0.3

Typical

0.3

Load at rated power: 1000 hours at 20°C

Shelf life: 12 months at room temperature

Derating from rated power at 20°C

Noise (in a decade of frequency)

∆R%

0.1

Zero at 150°C

µV/V

<2.5

Voltage coefficient of resistance

ppm/V

When resistors are required to be potted, the preferred

encapsulant is a silicone compound.

Matched Sets

Matched sets can be supplied for use as precision voltage

dividers. These may be screwed together to form sticks and,

by selecting the KU type of termination, a wire connection

can be provided at each end of the stick.

For voltage dividers with a low resistance section below the

minimum available value of 1kΩ, it is normal practice to use a

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

Enquiries are welcomed for special resistors and sets when

resistor length, operating voltage or resistance value are

outside the catalogued range.

Oil Immersion

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. A special lacquer protected version of

the resistor is available, suitable for immersion in transformer

oil or SF6.

Application Notes

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.

Packaging

Resistors are supplied packed in boxes.

An appropriate number of resistors may be screwed together

as a stick to provide an assembly which will be capable to

withstanding any desired voltage, providing no individual

resistor is subject to a greater stress or power dissipation than

is recommended in this data sheet, and that appropriate anti-

corona devices are fitted.

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.

Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com

Issue B · 03.02

194

T48KU [TTELEC]

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