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Document Number: 28733

4

Revision: 24-Feb-04

VR37

Vishay BCcomponents

High Ohmic/High Voltage Resistors

TESTS AND REQUIREMENTS

Essentially all tests are carried out in accordance with the

schedule

of

“IEC publication

60115-1”,

category

LCT/UCT/56 (rated temperature range: Lower Category

Temperature, Upper Category Temperature; damp heat,

long

term,

56 days).

The

testing

also

covers

the

requirements specified by EIA and EIAJ.

The tests are carried out in accordance with IEC publication

60068-2, “Recommended basic climatic and mechanical

robustness testing procedure for electronic components”

and under standard atmospheric conditions according to

“IEC 60068-1”, subclause 5.3.

In the Test Procedures and Requirements table the tests and

requirements are listed with reference to the relevant

clauses of “IEC publications 60115-1 and 60068-2”; a short

description of the test procedure is also given. In some

instances deviations from the IEC recommendations were

necessary for our method of specifying.

All soldering tests are performed with mildly activated flux.

TEST PROCEDURES AND REQUIREMENTS

IEC

60115-1

CLAUSE

IEC

60068-2

TEST

METHOD

TEST

PROCEDURE

REQUIREMENTS

4.16

21 (U)

robustness of terminations:

4.16.2

21 (Ua1)

tensile all samples

∅0.7 mm; load 10 N; 10 s

4.16.3

21 (Ub)

bending half number

of samples

∅0.7 mm; load 5 N; 4 × 90°

4.16.4

21 (Uc)

torsion other half

of samples

3 × 360° in opposite directions

no damage

∆R/R max.: ± 0.5 % + 0.05 Ω

4.17

20 (Ta)

solderability

2 s; 235 °C

good tinning; no damage

4.18

20 (Tb)

resistance to

soldering heat

thermal shock: 3 s; 350 °C;

3 mm from body

∆R/R max.: ± 0.5 % + 0.05 Ω

4.19

14 (Na)

rapid change of temperature

30 minutes at − 55 °C and

30 minutes at + 155 °C; 5 cycles

∆R/R max.: ± 0.5 % + 0.05 Ω