IEC 60939-1:2005/COR1:2005

Corrigendum 1 - Passive filter units for electromagnetic interference suppression - Part 1: Generic specification

General Information

• Status: Published
• Publication Date: 08-Nov-2005
• ICS: 31.160 - Electric filters
• Technical Committee: TC 40 - Capacitors and resistors for electronic equipment
• Current Stage: DELPUB - Deleted Publication
• Completion Date: 29-Jul-2010

Relations

• Corrects: IEC 60939-1:2005 - Passive filter units for electromagnetic interference suppression - Part 1: Generic specification
• Effective Date: 05-Sep-2023
• Revised: IEC 60939-1:2010 - Passive filter units for electromagnetic interference suppression - Part 1: Generic specification
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 60939-1
(Second edition – 2005)
Passive filter units for electromagnetic interference suppression –

Part 1: Generic specification
CORRIGENDUM 1
NOTE This corrigendum constitutes a revision of the structure of subclause 4.5, as well as an addition to subclause
4.10.3.
Page 17
4.5 Voltage tests
Replace the text from 4.5 to the end of 4.5.3.5 by the following:
4.5 Insulation resistance
For filters fitted with a discharge resistor, this measurement can only be made with the
discharge resistor disconnected. If the discharge resistor cannot be disconnected without the
filter being destroyed, the test shall be omitted for lot-by-lot tests; for qualification approval
and periodic tests, where the discharge resistor cannot be disconnected without the filter
being destroyed, the sample shall consist of filters specially made without discharge resistors.
4.5.1 Measuring voltage
Before the measurement is made, the filters shall be fully discharged. Unless otherwise
specified in the relevant specification, the insulation resistance shall be measured, at the d.c.
voltage specified in Table 2.
Table 2 – DC voltage for insulation resistance
Voltage rating of the filter Measuring voltage
U or U <  10 V U or U ± 10 %
R C C R
a)
(10 ± 1) V
10 V ≤ U or U < 100 V
R C
(100 ± 15) V
100 V ≤ U or U < 500 V
R C
(500 ± 50) V
500 V ≤ U or U
R C
a)
When it can be demonstrated that the voltage has no influence on
the measuring result, or that a known relationship exists,
measurement can be performed at voltages up to the rated or
category voltage (10 V shall be used in case of dispute).

U is the rated voltage for use in defining the measuring voltage to be used under standard
R
atmospheric conditions for testing.
U is the category voltage for use in defining the measuring voltage to be used at the upper
C
category temperature.
November 2005
4.5.2 Application of measuring voltage

The insulation resistance shall be measured between the measuring points defined in Table 3,

specified in the relevant specification.

Test A, between terminations, applies to all filters, whether insulated or not. See Test A of
Table 3.
Test B, internal insulation, applies to insulated filters in uninsulated metal cases. This test is

not applicable to coaxial filters. See Test B of Table 3.

Test C, external insulation, applies to insulated filters in non-metallic cases or in insulated

metal cases. For this test, the measuring voltage shall be applied using one of the three
following methods as specified in the relevant specification. This test is not applicable to
coaxial filters; it is applicable only to insulated filters in a non-metallic case or in an insulated
metal case. See Test C of Table 3.
4.5.2.1 Foil method
A metal foil shall be closely wrapped around the body of the filter.
For filters with axial terminations, this foil shall extend beyond each end by not less than
5 mm, provided that a minimum distance of 1 mm/kV, or 1 mm, whichever is greater, can be
maintained between the foil and the terminations. If this minimum distance cannot be
maintained, the extension of the foil shall be reduced by as much as is necessary to establish
the distance of 1 mm/kV, or 1 mm whichever is greater.
For filters with unidirectional terminations, a minimum distance of 1 mm/kV, or 1 mm,
whichever is greater, shall be maintained between the edge of the foil and each termination.
4.5.2.2 Method for filters with mounting devices
The filter shall be mounted in its normal manner on a metal plate, which extends at least
12,7 mm in all directions beyond the mounting face of the filter.
4.5.2.3 V-block method
The filter shall be clamped in the trough of a 90° metallic V-block of such size that the filter
body does not extend beyond the extremities of the block.
The clamping force shall be such as to guarantee adequate physical contact between the filter
and the block. The clamping force shall be chosen in such a way that no destruction or
damage of the filter occurs.
The filter shall be positioned in accordance with the following:
a) for cylindrical filters: the filter shall be positioned in the block so that the termination
furthest from the axis of the filter is nearest to one of the faces of the block;
b) for rectangular filters: the filter shall be positioned in the block so that the termination
nearest the edge of the filter is nearest to one of the faces of the block.
For cylindrical and rectangular filters having axial terminations, any out-of-centre positioning
of the termination at its emergence from the filter body shall be ignored.
4.5.3 Mean time to measuring
The insulation resistance shall be measured after the voltage has been applied for 60 s ± 5 s
unless otherwise prescribed in the detail specification.
November 2005
4.5.4 Temperature correction factor

When prescribed by the detail specification, the temperature at which the measurement is

made shall be noted. If this temperature differs from 20 °C, a correction shall be made to the

measured value by multiplying the value by the appropriate correction factor prescribed in the

sectional specification.
4.5.5 Information to be given in a detail specification

The relevant specification shall prescribe:

a) the tests and the measuring voltage corresponding to each of these tests (see Table 3);

b) the method of applying the voltage (one of the methods described in 4.5.2.1, 4.5.2.2 or
4.5.2.3);
c) time of electrification if other than 1 min;
d) any special precautions to be taken during measurements;
e) any correction factors required for measurement over the range of temperatures covered
by the standard atmospheric conditions for testing;
f) the temperature of measurement if other than the standard atmospheric conditions for
testing;
g) the minimum value of insulation resistance for the various tests.
Table 3 – Measuring points
Tests Description
A Between terminations Between pairs of lines carrying the load current through the suppression components
e.g. line-line or line-neutral.
B Internal insulation Between the load current terminations connected together and the case (except
where the case is one termination) (metal cased types only)

or
between the load current termination and the earth termination.
C External insulation Between the load current terminations connected together and the metal plate or foil
or V-block (insulated c
...