Multi-channel radio-frequency connectors - Part 2: Sectional specification for MQ4 series circular connectors (IEC 63138-2:2020)

IEC 63138-2:2020, which is a sectional specification (SS), provides information and rules for the preparation of detail specifications (DS) for MQ4 series circular connectors with four RF channels, as well as a detailed specification of the blank format. An MQ4 series circular connector with 50 Ω nominal impedance has four RF channels which can be engaged and disengaged at the same time. There are two versions of plug connectors, one is a quick-lock version, and the other is a threaded version. The socket connector provides two coupling mechanisms, a quick-lock and a threaded coupling. This document also specifies the mating face dimensions and gauging information of MQ4 series circular connectors, and tests selected from IEC 63138-1, applicable to all detail specifications relating to MQ4 series circular connectors.

Mehrkanalige Hochfrequenz-Steckverbinder – Teil 2: Rahmenspezifikation für Rundsteckverbinder der MQ4-Serie (IEC 63138-2:2020)

Connecteurs radiofréquences multicanaux - Partie 2: Spécification intermédiaire pour les connecteurs circulaires de série MQ4 (IEC 63138-2:2020)

l’IEC 63138-2:2020, qui est une spécification intermédiaire (SS), fournit des informations et des règles pour l'établissement de spécifications particulières (DS) relatives aux connecteurs circulaires de série MQ4 disposant de quatre canaux RF, ainsi qu’une spécification particulière-cadre. Un connecteur circulaire de série MQ4 présentant une impédance nominale de 50 Ω dispose de quatre canaux RF pouvant être accouplés et désaccouplés en même temps. Il existe deux versions de connecteurs mâles: une première version à verrouillage rapide et une seconde version filetée. Le connecteur femelle offre deux mécanismes de couplage: un couplage par verrouillage rapide et un couplage fileté. Le présent document spécifie également les dimensions de la face d’accouplement et les informations sur le calibre des connecteurs circulaires de série MQ4, ainsi que les essais choisis à partir de l’IEC 63138-1, applicables à toutes les spécifications particulières relatives aux connecteurs circulaires de série MQ4.

Večkanalni radiofrekvenčni konektorji - 2. del: Področna specifikacija za okrogle konektorje skupine MQ4 (IEC 63138-2:2020)

General Information

Status
Published
Publication Date
15-Feb-2021
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
12-Feb-2021
Due Date
19-Apr-2021
Completion Date
16-Feb-2021

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SLOVENSKI STANDARD
SIST EN IEC 63138-2:2021
01-april-2021

Večkanalni radiofrekvenčni konektorji - 2. del: Področna specifikacija za okrogle

konektorje skupine MQ4 (IEC 63138-2:2020)

Multi-channel radio-frequency connectors - Part 2: Sectional specification for MQ4 series

circular connectors (IEC 63138-2:2020)
Mehrkanalige Hochfrequenz-Steckverbinder – Teil 2: Rahmenspezifikation für
Rundsteckverbinder der MQ4-Serie (IEC 63138-2:2020)

Connecteurs radiofréquences multicanaux - Partie 2: Spécification intermédiaire pour les

connecteurs circulaires de série MQ4 (IEC 63138-2:2020)
Ta slovenski standard je istoveten z: EN IEC 63138-2:2021
ICS:
33.120.30 Radiofrekvenčni konektorji RF connectors
(RF)
SIST EN IEC 63138-2:2021 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN IEC 63138-2:2021
---------------------- Page: 2 ----------------------
SIST EN IEC 63138-2:2021
EUROPEAN STANDARD EN IEC 63138-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
February 2021
ICS 33.120.30
English Version
Multi-channel radio-frequency connectors - Part 2: Sectional
specification for MQ4 series circular connectors
(IEC 63138-2:2020)

Connecteurs radiofréquences multicanaux - Partie 2: Mehrkanalige Hochfrequenz-Steckverbinder - Teil 2:

Spécification intermédiaire pour les connecteurs circulaires Rahmenspezifikation für Rundsteckverbinder der MQ4-

de série MQ4 Serie
(IEC 63138-2:2020) (IEC 63138-2:2020)

This European Standard was approved by CENELEC on 2021-01-20. CENELEC members are bound to comply with the CEN/CENELEC

Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC

Management Centre or to any CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation

under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the

same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,

Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the

Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2021 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.

Ref. No. EN IEC 63138-2:2021 E
---------------------- Page: 3 ----------------------
SIST EN IEC 63138-2:2021
EN IEC 63138-2:2021 (E)
European foreword

The text of document 46F/524/FDIS, future edition 1 of IEC 63138-2, prepared by SC 46F "RF and

microwave passive components" of IEC/TC 46 "Cables, wires, waveguides, RF connectors, RF and

microwave passive components and accessories" was submitted to the IEC-CENELEC parallel vote

and approved by CENELEC as EN IEC 63138-2:2021.
The following dates are fixed:

• latest date by which the document has to be implemented at national (dop) 2021-10-20

level by publication of an identical national standard or by endorsement

• latest date by which the national standards conflicting with the (dow) 2024-01-20

document have to be withdrawn

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.

Endorsement notice

The text of the International Standard IEC 63138-2:2020 was approved by CENELEC as a European

Standard without any modification.
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SIST EN IEC 63138-2:2021
EN IEC 63138-2:2021 (E)
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments)

applies.

NOTE 1 Where an International Publication has been modified by common modifications, indicated by (mod), the

relevant EN/HD applies.

NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available

here: www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 63138-1 2019 Multi-channel radio frequency connectors - EN IEC 63138-1 2019
Part 1: Generic specification - General
requirements and test methods
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SIST EN IEC 63138-2:2021
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SIST EN IEC 63138-2:2021
IEC 63138-2
Edition 1.0 2020-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Multi-channel radio-frequency connectors –
Part 2: Sectional specification for MQ4 series circular connectors
Connecteurs radiofréquences multicanaux –
Partie 2: Spécification intermédiaire pour les connecteurs circulaires
de série MQ4
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.120.30 ISBN 978-2-8322-9148-1

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 7 ----------------------
SIST EN IEC 63138-2:2021
– 2 – IEC 63138-2:2020 © IEC 2020
CONTENTS

FOREWORD ........................................................................................................................... 4

1 Scope .............................................................................................................................. 6

2 Normative references ...................................................................................................... 6

3 Terms and definitions ...................................................................................................... 6

4 Mating face and gauge information .................................................................................. 6

4.1 Mating face dimensions .......................................................................................... 6

4.1.1 MQ4 socket connector ..................................................................................... 6

4.1.2 MQ4 plug connector ........................................................................................ 8

4.1.3 Mating face of RF channel ............................................................................. 11

4.2 Gauges ................................................................................................................. 12

4.2.1 Gauge for RF channel.................................................................................... 12

4.2.2 Gauge rings for plug outer contact ................................................................. 13

4.2.3 Gauge for MQ4 socket connector ................................................................... 14

4.2.4 Gauge for MQ4 plug connector ...................................................................... 15

5 Quality assessment procedure ....................................................................................... 16

5.1 General ................................................................................................................. 16

5.2 Rating and characteristics ..................................................................................... 16

5.3 Quality assessment ............................................................................................... 18

5.3.1 General ......................................................................................................... 18

5.3.2 Inspection procedure ..................................................................................... 18

5.3.3 Lot-by-lot inspection ...................................................................................... 19

5.3.4 Periodic inspections ....................................................................................... 20

6 Instructions for preparation of detail specifications ........................................................ 21

6.1 General ................................................................................................................. 21

6.2 Identification of the component ............................................................................. 22

6.3 Performance ......................................................................................................... 22

6.4 Marking, ordering information and related matters ................................................ 22

6.5 Selection of tests, test conditions and severities ................................................... 22

6.6 Blank detail specification pro forma for MQ4 series circular connectors ................ 23

7 Marking ......................................................................................................................... 27

7.1 Marking of components ......................................................................................... 27

7.2 Marking and contents of package .......................................................................... 27

Figure 1 – MQ4 socket connector ........................................................................................... 7

Figure 2 – MQ4 quick-lock plug connector .............................................................................. 9

Figure 3 – MQ4 threaded plug connector .............................................................................. 10

Figure 4 – Mating face of RF channel ................................................................................... 11

Figure 5 – Gauge for socket contact of RF channel ............................................................... 12

Figure 6 – Gauge for plug outer contact ................................................................................ 13

Figure 7 – Gauge for MQ4 socket connector ......................................................................... 14

Figure 8 – Gauge for MQ4 plug connector ............................................................................ 15

Table 1 – Dimensions of MQ4 socket connector ...................................................................... 8

Table 2 – Dimensions of MQ4 quick-lock plug connector ......................................................... 9

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SIST EN IEC 63138-2:2021
IEC 63138-2:2020 © IEC 2020 – 3 –

Table 3 – Dimensions of MQ4 threaded plug connector ........................................................ 10

Table 4 – Dimensions of RF channel ..................................................................................... 11

Table 5 – Dimensions of gauge for socket contact ................................................................ 12

Table 6 – Dimensions of gauge for plug outer contact ........................................................... 13

Table 7 – Dimensions of gauge for MQ4 socket connector .................................................... 14

Table 8 – Dimensions of gauge for MQ4 plug connector ....................................................... 15

Table 9 – Rating and characteristics ..................................................................................... 16

Table 10 – Qualification inspection ....................................................................................... 18

Table 11 – Lot-by-lot inspection ............................................................................................ 20

Table 12 – Sampling plans for mechanical compatibility and return loss inspection ............... 20

Table 13 – Periodic inspection .............................................................................................. 21

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SIST EN IEC 63138-2:2021
– 4 – IEC 63138-2:2020 © IEC 2020
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
MULTI-CHANNEL RADIO-FREQUENCY CONNECTORS –
Part 2: Sectional specification for MQ4 series circular connectors
FOREWORD

1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

all national electrotechnical committees (IEC National Committees). The object of IEC is to promote

international co-operation on all questions concerning standardization in the electrical and electronic fields. To

this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,

Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as "IEC

Publication(s)"). Their preparation is entrusted to technical committees; any IEC National Committee interested

in the subject dealt with may participate in this preparatory work. International, governmental and non-

governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely

with the International Organization for Standardization (ISO) in accordance with conditions determined by

agreement between the two organizations.

2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international

consensus of opinion on the relevant subjects since each technical committee has representation from all

interested IEC National Committees.

3) IEC Publications have the form of recommendations for international use and are accepted by IEC National

Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC

Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any

misinterpretation by any end user.

4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications

transparently to the maximum extent possible in their national and regional publications. Any divergence

between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in

the latter.

5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity

assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any

services carried out by independent certification bodies.

6) All users should ensure that they have the latest edition of this publication.

7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and

members of its technical committees and IEC National Committees for any personal injury, property damage or

other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and

expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC

Publications.

8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is

indispensable for the correct application of this publication.

9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of

patent rights. IEC shall not be held responsible for identifying any or all such patent rights.

International Standard IEC 63138-2 has been prepared by subcommittee 46F: RF and

microwave passive components, of IEC technical committee 46F: Cables, wires, waveguides,

RF connectors, RF and microwave passive components and accessories.
The text of this International Standard is based on the following documents:
FDIS Report on voting
46F/524/FDIS 46F/533/RVD

Full information on the voting for the approval of this International Standard can be found in

the report on voting indicated in the above table.

This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

---------------------- Page: 10 ----------------------
SIST EN IEC 63138-2:2021
IEC 63138-2:2020 © IEC 2020 – 5 –

A list of all parts in the IEC 63138 series, published under the general title Multi-channel

radio-frequency connectors, can be found on the IEC website.

The committee has decided that the contents of this document will remain unchanged until the

stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to

the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
---------------------- Page: 11 ----------------------
SIST EN IEC 63138-2:2021
– 6 – IEC 63138-2:2020 © IEC 2020
MULTI-CHANNEL RADIO-FREQUENCY CONNECTORS –
Part 2: Sectional specification for MQ4 series circular connectors
1 Scope

This part of IEC 63138, which is a sectional specification (SS), provides information and rules

for the preparation of detail specifications (DS) for MQ4 series circular connectors with four

RF channels, as well as a detailed specification of the blank format.

An MQ4 series circular connector with 50 Ω nominal impedance has four RF channels which

can be engaged and disengaged at the same time. There are two versions of plug connectors,

one is a quick-lock version, and the other is a threaded version. The socket connector

provides two coupling mechanisms, a quick-lock and a threaded coupling.

MQ4 series circular connectors can be used in mobile communication systems and in other

communication equipment.

This document also specifies the mating face dimensions and gauging information of MQ4

series circular connectors, and tests selected from IEC 63138-1, applicable to all detail

specifications relating to MQ4 series circular connectors.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their

content constitutes requirements of this document. For dated references, only the edition

cited applies. For undated references, the latest edition of the referenced document (including

any amendments) applies.

IEC 63138-1:2019, Multi-channel radio frequency connectors – Part 1: Generic specification –

General requirements and test methods
3 Terms and definitions

For the purposes of this document, the terms and definitions given in IEC 63138-1 apply.

ISO and IEC maintain terminological databases for use in standardization at the following

addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
4 Mating face and gauge information
4.1 Mating face dimensions
4.1.1 MQ4 socket connector

The mating face of MQ4 socket connectors is shown in Figure 1 and its dimensions are shown

in Table 1.
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SIST EN IEC 63138-2:2021
IEC 63138-2:2020 © IEC 2020 – 7 –

NOTE Metric dimensions are original dimensions. All undimensioned pictorial configurations are for reference

purpose only.
NOTE 1 Mechanical reference plane.
NOTE 2 Chamfer of the four supplementary grooves is optional.
NOTE 3 Chamfer of the main groove is optional.

NOTE 4 The mating face of the RF channel with pin contact is shown in Figure 4a) and its dimensions are shown

in Table 4.
NOTE 5 The shape of seal ring is optional.

NOTE 6 The initial position number of the RF channel with pin contact and the other positions numbered

clockwise.
Figure 1 – MQ4 socket connector
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SIST EN IEC 63138-2:2021
– 8 – IEC 63138-2:2020 © IEC 2020
Table 1 – Dimensions of MQ4 socket connector
Ref.
Min. Max.
a 31,75 31,80
b 30,35 30,40
c M30 × 1 tolerance 6 g
d 6,80 7,00
e 26,42 26,48
f 6,00 --
g R3,0 nom.
h 7,95 8,05
i 10,95 11,00
j 1,50 1,80
k 19,30 19,45
m 13,90 14,00
p 3,20 3,35
q 1,60 1,75
r 0,50 0,60
t 15,48 15,52
u 10,30 10,90
4.1.2 MQ4 plug connector
4.1.2.1 MQ4 quick-lock plug connector

The mating face of the MQ4 connector with quick-lock type is shown in Figure 2 and its

dimensions are shown in Table 2.
---------------------- Page: 14 ----------------------
SIST EN IEC 63138-2:2021
IEC 63138-2:2020 © IEC 2020 – 9 –
NOTE 1 Mechanical reference plane.

NOTE 2 The mating face of the RF channel with socket contact is shown in Figure 4b) and its dimensions are

shown in Table 4.
NOTE 3 The shape of the four supplementary keys is optional.
NOTE 4 The shape of the main key is optional.
NOTE 5 The shape of the spring finger is optional.

NOTE 6 The initial position number of the RF channel with the socket contact and other positions numbered

anticlockwise.
Figure 2 – MQ4 quick-lock plug connector
Table 2 – Dimensions of MQ4 quick-lock plug connector
Ref.
Min. Max.
a -- 42,00
b 31,80 31,90
c 30,05 30,15
d 26,30 26,40
e 8,40 8,60
f 1,20 1,50
g 11,00 11,10
h 6,60 6,80
i 15,48 15,52
j 13,70 13,80
k 7,52 7,58
m 3,00 3,15
n 1,40 1,55
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SIST EN IEC 63138-2:2021
– 10 – IEC 63138-2:2020 © IEC 2020
4.1.2.2 MQ4 threaded plug connector

The mating face of the MQ4 threaded plug connector is shown in Figure 3 and its dimensions

are shown in Table 3.
NOTE 1 Mechanical reference plane.

NOTE 2 The mating face of the RF channel with socket contact is shown in Figure 4b) and its dimensions are

shown in Table 4.
NOTE 3 The shape of the four supplementary keys is optional.
NOTE 4 The shape of the main key is optional.

NOTE 5 The initial position number of the RF channel with socket contact and the other positions numbered anti-

clockwise.
Figure 3 – MQ4 threaded plug connector
Table 3 – Dimensions of MQ4 threaded plug connector
Ref.
Min. Max.
a 7,52 7,58
b 26,35 26,40
c M30 × 1 tolerance 6 H
d 1,20 1,50
e 5,20 5,60
f 11,20 --
i 7,00 --
j 13,70 13,80
k 15,48 15,52
m 3,00 3,15
n 1,40 1,55
p 32,0 nom.
---------------------- Page: 16 ----------------------
SIST EN IEC 63138-2:2021
IEC 63138-2:2020 © IEC 2020 – 11 –
4.1.3 Mating face of RF channel

The mating face of the RF channel with pin contact is shown in Figure 4a), the mating face of

the RF channel with socket contact is shown in Figure 4b), and their dimensions are shown in

Table 4.
a) RF channel with pin contact
b) RF channel with socket contact
NOTE Mechanical reference plane.
Figure 4 – Mating face of RF channel
Table 4 – Dimensions of RF channel
Ref.
Min. Max.
a 1,17 1,23
b 5,90 5,93
c 7,25 7,35
d 0,35 0,65
e 2,60 2,90
f 2,90 3,70
g 0,00 0,25
h 0,75 1,00
j 0,00 0,25
k 0,00 0,20
m 3,00 --
n -- --
---------------------- Page: 17 ----------------------
SIST EN IEC 63138-2:2021
– 12 – IEC 63138-2:2020 © IEC 2020
Ref.
Min. Max.
p 1,8 nom.
q -- 6,45
r 3,80 --
u 6,50 6,70
v 1,55 1,65
s -- --

Slot design is optional when mating with a pin with Ø1,17 mm to Ø1,23 mm. It should meet the requirements

of mechanical and electrical performance.
Expand to meet the requirements with gauge rings for socket outer contact.
4.2 Gauges
4.2.1 Gauge for RF channel
4.2.1.1 Socket centre contact
4.2.1.2 Dimensions of gauge

The gauge for the socket contact of the RF channel is shown in Figure 5 and its dimensions

are shown in Table 5.
Figure 5 – Gauge for socket contact of RF channel
Table 5 – Dimensions of gauge for socket contact
Gauge C
Gauge A Gauge B
(for retention)
(for sizing) (for insertion)
Mass of gauge: 40 g
Ref.
mm mm mm
Min. Max. Min. Max. Min. Max.
a 1,235 1,240 1,230 1,235 1,165 1,170
b 0,70 1,00 0,90 1,20 0,90 1,20

Material: Polished steel, cylindrical surface, roughness of diameter a: Ra ≤ 0,4 μm.

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SIST EN IEC 63138-2:2021
IEC 63138-2:2020 © IEC 2020 – 13 –
4.2.1.3 Test procedure
Test procedure is as follows:
a) Sizing test

Insert gauge A into the centre contact three times, the depth of insertion being not less

than 0,7 mm; this is a sizing operation.
b) Insertion test

After the sizing operation, insert gauge B into the centre contact; the insertion force shall

not be less than 6 N.
c) Retention test

After the sizing or insertion operation, gauge C shall be inserted into the socket centre

contact. The contact shall retain the mass of gauge C in a vertical downward position.

4.2.2 Gauge rings for plug outer contact
4.2.2.1 Dimensions of gauge

The gauge for the plug outer contact of the RF channel is shown in Figure 6 and its

dimensions are shown in Table 6.
Figure 6 – Gauge for plug outer contact
Table 6 – Dimensions of gauge for plug outer contact
Gauge C
Gauge A Gauge B
(for retention)
(for sizing) (for insertion)
Mass of gauge: 400 g
Ref.
mm mm mm
Min. Max. Min. Max. Min. Max.
a 5,880 5,885 5,895 5,900 5,930 5,935
b 7,25 7,35 7,25 7,35 7,25 7,35
c 6,70 6,80 6,70 6,80 6,70 6,80
d 2,70 3,00 2,70 3,00 2,70 3,00
v 1,55 1,65 1,55 1,65 1,55 1,65

Material: Polished steel, cylindrical surface, roughness of diameter a: Ra ≤ 0,4 μm.

4.2.2.2 Test procedure
a) Sizing test

Gauge A should be inserted into the outer contact of the RF channel three times, the

depth of insertion being not less than 2,7 mm; this is a sizing operation.
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SIST EN IEC 63138-2:2021
– 14 – IEC 63138-2:2020 © IEC 2020
b) Insertion test

After the sizing operation, if specified in the detail specification, the force necessary to

insert gauge B fully into the outer contact shall be measured and it shall not exceed 15 N.

c) Retention test

After the sizing or insertion operation, gauge C shall be inserted into the outer contact.

The contact shall retain the mass of gauge C in a vertical downward position.
4.2.3 Gauge for MQ4 socket connector
4.2.3.1 Dimensions of gauge

The gauge for the MQ4 socket connector is shown in Figure 7 and its dimensions are shown

in Table 7.
NOTE 1 Mechanical reference plane.
NOTE 2 The shape of the four supplementary keys is optional.
NOTE 3 The shape of the main key is optional.
Figure 7 – Gauge for MQ4 socket connector
Table 7 – Dimensions of gauge for MQ4 socket connector
Ref.
Min. Max.
a 7,50 7,60
b 5,00 --
c 1,20 1,50
d 15,48 15,52
e 26,35 26,40
f 13,70 13,85
m 3,00 3,15
n 1,40 1,55
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SIST EN IEC 63138-2:2021
IEC 63138-2:2020 © IEC 2020 – 15 –
4.2.3.2 Test procedure

The gauge should be inserted into the MQ4 socket connector three times, and then the

insertion force is measured; the insertion force should not be more than 50 N.
4.2.4 Gauge for MQ4 plug connector
4.2.4.1 Dimensions of gauge

The gauge for the MQ4 plug connector is shown in Figure 8 and its dimensions are shown in

Table 8.
NOTE 1 Mechanical reference plane.
NOTE 2 Chamfer of the four supplementary grooves is optional.
NOTE 3 Chamfer of the main groove is optional.
Figure 8 – Gauge for MQ4 plug connector
Table 8 – Dimensions of gauge for MQ4 plug connector
Ref.
Min. Max.
a 7,35 7,45
5,88 5,90
c 2,50 --
d 10,90 11,00
e 26,42 26,48
f 29,80 30,00
g 10,50 10,60
h 2,90 3,00
p 14,00 14,10
t 15,48 15,52
m 3,20 3,35
1,60 1,75
---------------------- Page: 21 ----------------------
SIST EN IEC 63138-2:2021
– 16 – IEC 63138-2:2020 © IEC 2020
4.2.4.2 Test procedure

The gauge should be inserted into the MQ4 plug connector three times, and then the insertion

force is measured; the insertion force should not be more than 50 N.
5 Quality assessment procedure
5.1 General

Subclause 5.2 to Subclause 5.3.4 provide the recommended rating, performance and test

conditions to be considered when preparing a detail specification. They also specify the test

schedules and procedure that suit the corresponding quality inspection level.
5.2 Rating and characteristics

The values indicated in Table 9 are recommended for MQ4 series circular connectors, and are

given for the writer of the detail specification. They are applicable for the condition when the

connectors are fully mated. The preferable characteristics can be seen in Table 9.

Certain tests are listed without any recommended values being given when they are not

required. When such tests are required, appropriate values shall be entered in the detail

specification at the discretion of the specification writer.
Table 9 – Rating and characteristics
Test method Remarks, deviation
Rating and characteristics IEC 63138-1:2019 Value from standard test
Subclause method
Electrical
Nominal impedance 50 Ω
Frequency range DC to 6 GHz
Return loss ≥26 dB (DC to 3 GHz) Each RF channel
8.4.1
tested separately
≥19 dB (3 GHz to 6 GHz)
Each RF channel
Centre contact resistance
8.4.3
tested separately
– initial ≤3,0 mΩ
– after conditioning ≤5,0 mΩ
Outer conductor
...

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