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Document Number: 30260

152

Revision: 02-Dec-09

HVR25, HVR37

Vishay BCcomponents

High Ohmic/High Voltage

Metal Film Leaded Resistors

TESTS AND REQUIREMENTS

Essentially all tests are carried out in accordance with IEC 60115-1, category 55/155/56 (rated temperature range

- 55 °C to + 155 °C; damp heat, long term, 56 days) and along the lines of IEC 60068-2-xx test method. The tests are carried out

under standard atmospheric conditions according to IEC 60068-1, 5.3 unless otherwise specified. In some instances deviations

from IEC recommendations were necessary for our method of specifying.

PERFORMANCE

IEC

60115-1

CLAUSE

IEC

60068-2-xx

TEST

METHOD

TEST

PROCEDURE

REQUIREMENTS

PERMISSIBLE CHANGE (

ΔR)

HVR25

HVR37

4.8

-

Temperature

coefficient

Between

- 55 °C and + 155 °C

± 200 ppm/K

4.25.1

-

Endurance at 70 °C

1000 h;

loaded with

1.5 h ON; 0.5 h OFF

for 5 % tolerance

± (5 %

R + 0.1

Ω)

for 1 % tolerance

± (1.5 %

R + 0.1

Ω)

4.24

78 (Cab)

Damp heat,

steady state

56 days; 40 °C;

90 % to 95 % RH

loaded with 0.01

for 5 % tolerance

± (5 %

R + 0.1

Ω)

for 1 % tolerance

± (1.5 %

R + 0.1

Ω)

4.23

Climatic sequence

± (1.5 %

R + 0.1

Ω)

4.23.2

2 (Ba)

Dry heat

16 h, 155 °C

4.23.3

30 (Db)

Damp heat,

cyclic

24 h; 25 °C to 55 °C

90 % to 100 % RH; 1 cycle

4.23.4

1 (Aa)

Cold

2 h, - 55 °C

4.23.6

30 (Db)

Damp heat,

(accelerated)

remaining cycles

5 days; 25 °C to 55 °C

90 to 100 % RH

4.19

14 (Na)

Rapid change of

temperature

30 min at LCT;

30 min at UCT;

LCT = - 55 °C;

UCT = 155 °C;

5 cycles

No visual damage

± (1 %

R + 0.1

Ω)

4.13

-

Short time overload

Room temperature;

dissipation 6.25 x

(voltage not more than 2 x limiting

voltage,

10 cycles 5 s ON and 45 s OFF

for 5 % tolerance

± (2 %

R + 0.1

Ω)

for 1 % tolerance

± (1 %

R + 0.1

Ω)

4.12

-

Noise

IEC 60195

Max. 5 µV/V

Max. 2.5 µV/V

4.16

Robustness of

terminations:

No damage

± (1 %

R + 0.1

Ω)

4.16.2

21 (Ua1)

Tensile all samples

Load 10 N; 10 s

4.16.3

21 (Ub)

Bending half number

of samples

Load 5 N; 4 x 90°

4.16.4

21 (Uc)

Torsion other half of

samples

3 x 360° in opposite direction