IEC 63138-2:2020

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
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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

– 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

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

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

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.
– 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.
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

– 8 – IEC 63138-2:2020 © IEC 2020
Table 1 – Dimensions of MQ4 socket connector
mm
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.

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
mm
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
– 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
mm
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.
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
mm
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 --
a
n -- --
– 12 – IEC 63138-2:2020 © IEC 2020
mm
Ref.
Min. Max.
p 1,8 nom.
b
q -- 6,45
r 3,80 --
u 6,50 6,70
v 1,55 1,65
a
s -- --
a
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.
b
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)
+2
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.

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)
+2
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.

– 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
mm
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
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
mm
Ref.
Min. Max.
a 7,35 7,45
b
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
n
1,60 1,75
– 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
a
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)
b
Each RF channel
Centre contact resistance
8.4.3
tested separately
– initial ≤3,0 mΩ
– after conditioning ≤5,0 mΩ
Outer conductor resistance Each RF channel
8.4.3
tested separately
– initial ≤2,0 mΩ
– after conditioning ≤ 3,0 mΩ
b
Insulation resistance Each RF channel
8.4.4
tested separately
– initial ≥ 5 000 MΩ
– after conditioning ≥ 200 MΩ
c d
Proof voltage at sea level (86 to 106) kPa,
8.4.5 1 000 V Test each RF channel
separately
e
Screening effectiveness ≥ 90 dB, up to 3 GHz
Z ≤ 10 mΩ, Each RF
t
8.4.6
channel tested
≥ 70 dB, 3 GHz to 6 GHz
separately
RF power rating 8.4.10 150 W at 2 GHz, CW
Discharge test See DS Each RF channel
8.4.7
tested separately
Test method Remarks, deviation
Rating and characteristics IEC 63138-1:2019 Value from standard test
Subclause method
Isolation ≥ 90 dB, 0,05 GHz to Test between two
8.4.9
6 GHz adjacent channels
Intermodulation level (PIM3) ≥ 160 dBc
Frequency: 0 GHz to Each RF channel
8.4.8
2,7 GHz tested separately
Power: 2 × 20 W
Mechanical
Centre contact captivation Each RF channel
8.5.2
tested separately
After the test, the
– axial force
centre contact shall
– axial torque
See DS meet the requirement
for the dimension of
mating face.
Test each RF channel
RF channel captivation 8.5.3 with socket centre
contact separately
– axial force After the test, RF
channels of the
connector shall meet
≥ 240 N
the requirement for
the dimension of
mating face.
Engagement and disengagement forces 8.5.4
– axial force (engagement) ≤ 100 N (quick lock type)
– axial force (disengagement) ≤ 100 N (quick lock type)
– torque ≥ 25 N·m (threaded type)
Gauge retention (resilient contacts)
– centre contact 8.5.5 ≥ 0,4 N See 4.2.1
– outer contact ≥ 4 N See 4.2.2
Mechanical compatibility 8.3.4 Insertion force ≤ 50 N See 4.2.3 to 4.2.4
Mechanical test for cable clamping

device
– cable rotation (nutation of cable end) 8.5.6 See DS
– cable pulling 8.5.7 See DS
– cable bending 8.5.8 See DS
– cable torsion 8.5.9 See DS
Strength of coupling mechanism Axial force: ≥ 450 N
Coupling torque
8.5.10
resistance: ≥ 30 N·m
(threaded type)
High frequency vibration 8.5.12 100 m/s , (10 to 2 000) Hz
Shock 500 m/s , 1/2 sine
8.5.13
wave, 11 ms
Environmental
f
Climatic category  A:40/85/21
Hermetic sealed 8.6.6 NA
Leakage 8.6.5
Salt mist Duration of spraying,
8.6.7 48 h
test after mating
– 18 – IEC 63138-2:2020 © IEC 2020
Test method Remarks, deviation
Rating and characteristics IEC 63138-1:2019 Value from standard test
Subclause method
Endurance
Mechanical endurance 8.5.14 100 operations
a
These values apply to the basic connector. In practice, these may be influenced by the cable used and
reference should always be made to the actual values given in the DS.
b
Values for a single pair of RF channels.
c
Voltages are RMS values of a.c. at 40 Hz to 65 Hz, unless otherwise specified.
d
Some cables usable with these connectors have ratings lower than the values given here.
e
When interfaces are fully mated.
f
For certain connectors, the upper temperature limit is restricted by the cable characteristics. Reference
should be made to the relevant cable specification.

5.3 Quality assessment
5.3.1 General
Quality assessment shall be performed according to IEC 63138-1, except for the provisions in
5.3.2 to 5.3.4.
5.3.2 Inspection procedure
Table 10 describes the qualification inspection tests to be performed.
Table 10 – Qualification inspection
IEC 63138-1:2019 Number of
Test
Subclause specimens
Group 1
Visual examination 8.2
Marking 8.2
Workmanship 8.2
Dimensions and interchangeability 8.3
RF channel interface dimensions 8.3.1
Connector interface dimensions 8.3.2
Outline dimensions 8.3.3 6
Mechanical compatibility 8.3.4
Engagement and disengagement forces 8.5.4
a
Gauge retention force 8.5.5
Hermetic seal 8.6.6
Leakage 8.6.5
Insulation resistance 8.4.4
Group 2
Centre contact captivation 8.5.2
RF channel captivation 8.5.3 2
Salt mist 8.6.7
IEC 63138-1:2019 Number of
Test
Subclause specimens
Group 3
Return loss 8.4.1
Insertion loss 8.4.2
Isolation 8.4.9
Screening effectiveness 8.4.6
Passive intermodulation level (PIM) 8.4.8
b
RF power rating 8.4.10
High temperature endurance 8.6.3
Low temperature endurance 8.6.4
Mechanical endurance 8.5.14
Safety wire hole pullout 8.5.15
Group 4
Contact resistance 8.4.3
Voltage proof 8.4.5
Discharge test 8.4.7
Low frequency vibration 8.5.11
High frequency vibration 8.5.12
Shock 8.5.13
Thermal shock 8.6.2 2
Damp heat, steady state 8.6.1
Effectiveness against cable rotation 8.5.6
Effectiveness against cable pulling 8.5.7
Effectiveness against cable bending 8.5.8
Effectiveness against cable torsion 8.5.9
Strength of coupling mechanism 8.5.10
Group 5
c
Solderability
8.5.1
a
The sample size of RF channels for test for gauge retention force is 3 sets of RF channels.
b
The tests are performed only for initial qualification approval if the qualified connectors have no change in
design and manufacturing processes.
c
The test shall be performed using 3 sets of piece-parts individually taken from the lot before being assembled
into connectors.
5.3.3 Lot-by-lot inspection
The group A and B test shall be subject to the inspections specified in Table 11 and in the
order given in the said table. Sampling plans for mechanical compatibility and return loss
inspection shall comply with Table 12.

– 20 – IEC 63138-2:2020 © IEC 2020
Table 11 – Lot-by-lot inspection
IEC 63138-1:2019 Number of
Test
Subclause specimens
Group A
Visual examination 8.2
Marking 8.2
Workmanship 8.2
Dimensions and interchangeability 8.3
RF channel interface dimensions 8.3.1.1
Connector interface dimensions 8.3.1.2
Outline dimensions 8.3.3 100 %
Mechanical compatibility 8.3.4
Engagement and disengagement forces 8.5.4
a
Gauge retention force 8.5.5
Hermetic seal 8.6.6
Leakage 8.6.5
Insulation resistance 8.4.4
Group B
Mechanical compatibility 8.3.4
See Table 12
Return loss 8.4.1
a
Sample size of RF channels for test for gauge retention force is 3 sets of RF channels.

Table 12 – Sampling plans for mechanical compatibility and return loss inspection
Sample size for mechanical Sample size for return loss
Lot size
compatibility inspection inspection
a
1 to 100 2 1
101 to 1 200 5 2
1 201 to above 10 3
a
When lot size is 1, the corresponding sample size is also 1.

5.3.4 Periodic inspections
Table 13 describes the periodic tests to be performed.

Table 13 – Periodic inspection
IEC 63138-1:2019
Test Sample size
Subclause
Group D1 1
Centre contact captivation 8.5.2
RF channel captivation 8.5.3
Salt mist 8.6.7
Group D2 1
Return loss 8.4.1
Insertion loss 8.4.2
Isolation 8.4.9
Screening effectiveness 8.4.6
Passive intermodulation level (PIM) 8.4.8
a
RF power rating 8.4.10
High temperature endurance 8.6.3
Low temperature endurance 8.6.4
Mechanical endurance 8.5.14
Safety wire hole pullout 8.5.15
Group D3 1
Contact resistance 8.4.3
Discharge test 8.4.7
Low frequency vibration 8.5.11
High frequency vibration 8.5.12
Shock 8.5.13
Thermal shock 8.6.2
Damp heat, steady state 8.6.1
Effectiveness against cable rotation 8.5.6
Effectiveness against cable pulling 8.5.7
Effectiveness against cable bending 8.5.8
Effectiveness against cable torsion 8.5.9
Strength of coupling mechanism 8.5.10
Group D4
b
Solderability 8.5.1
a
The tests are performed only for initial qualification approval if the qualified connectors have no change in
design and manufacturing processes.
b
The test shall be performed using 3 sets of piece-parts individually taken from the lot before being assembled
into connectors.
6 Instructions for preparation of detail specifications
6.1 General
Detail specification (DS) writers shall use the appropriate blank detail specification (BDS).
Clause 6 comprises the BDS dedicated for use with MQ4 series circular connectors. As such,
the BDS will already have information entered on it in relation to:

– 22 – IEC 63138-2:2020 © IEC 2020
– the basic specification number applicable to all the detail specifications covering
connector styles of the series covered by the sectional specification;
– the connector series designation.
The specification writer should enter the details relating to the connector style to be covered
by the BDS, as indicated. The numbers in brackets in the BDS correspond to the indications
in 6.2 to 6.5, which shall be given.
6.2 Identification of the component
1) Enter the following details:
– style: the style designation of the connector including type of fixing and sealing, if
applicable;
– attachment: by deletion of the inapplicable options of cable/wire given for centre and
outer conductors;
– special features and markings: as applicable;
– series designation: in bold characters/digits approximately 15 mm high.
2) Enter details of assessment level and the climatic category.
3) A reproduction of the outline drawing and details of the panel piercing (if applicable). It
shall provide the maximum envelope dimensions, the position of the reference plane and,
in the case of a fixed connector, the position of the mounting plane relative to the front
face of the connector.
Any maximum panel thickness limitations for fixed connectors shall be stated.
4) Particulars of all variants covered by the DS. As appropriate, the information shall include:
– cable types (or sizes) applicable to each variant;
– alternative plated or protective finishes;
– details of alternative mounting flanges having either tapped or plain mounting holes;
– details of alternative solder spills or solder buckets including, when applicable, those
for use with microwave integrated circuit (MIC) components.
6.3 Performance
5) Performance data listing the most important characteristics of the connector in accordance
with the requirements of the relevant sectional specification. Deviations from the minimum
requirements shall be clearly indicated. Non-applicable parameters shall be marked "na".
6.4 Marking, ordering information and related matters
6) Insert marking and ordering information as appropriate, together with details of related
documents and any invoked structural similarity.
6.5 Selection of tests, test conditions and severities
7) "na" shall be used to indicate non-applicable tests. All tests marked "a" by the detail
specification writer shall be mandatory.
When using the normal procedure with a dedicated BDS, the letter "a" – for applicable – shall
be entered in the "test required" column opposite each of the tests indicated as being
mandatory in the test schedule of the relevant sectional specification. Any additional test
required at the discretion of the specification writer shall also be indicated by an "a".
The specification writer shall also indicate, when necessary, details of deviations from the
standard test methods and conditions including any relevant deviations given in the test
schedule of the sectional specification.

6.6 Blank detail specification pro forma for MQ4 series circular connectors
Subclause 6.6 contains the complete BDS.
(1) Page 1 of
(2)
(3) ELECTRONIC COMPONENT OF ASSESSED (4) Issue
QUALITY IN ACCORDANCE WITH:
GENERIC SPECIFICATION: IEC 63138-1
SECTIONAL SPECIFICATION: IEC 63138-2
(5) Detail specification for radio-frequency coaxial connector of
Type
assessed quality
MQ4
Style Special features and markings
Method of cable/wire+ attachment Centre conductor – solder/crimp+
Outer conductor – solder/clamp/crimp+
+Delete as appropriate
(6) Assessment level Characteristic impedance …Ω Climatic category …/…/…
(7) Outline and maximum dimensions Panel piercing and mounting details
(8) Variants
Description of
Variant no. IEC 63138-2
variant
Information about manufacturers who have components qualified under the IECQ Conformity Assessment
System is available through the IECQ on-line certificate system.

– 24 – IEC 63138-2:2020 © IEC 2020
(9) Performance (including limiting conditions of use)
IEC 63138-1: Remarks including any
Ratings and Variant no.
2019 Value deviations from standard
characteristics designation
Subclause test methods
Electrical
Nominal impedance  50 Ω
Frequency range  DC to 6 GHz
Return loss 01 8.4.1 GHz Measurement frequency
range
GHz
GHz
GHz
Centre contact resistance 8.4.3 ≤    mΩ Initial
≤    mΩ After conditioning
Insulation resistance 8.4.4 ≥    GΩ Initial
≥    GΩ After conditioning
+ Proof voltage at sea 01 8.4.5 kV 86 kPa to 106 kPa
level
kV
kV
kV
+ Proof voltage at 01 8.4.5 kV kPa (if not 4,4 kPa)
4,4 kPa
kV
kV
kV
Screening effectiveness 01 8.4.6 dB at GHz
Zt ≤  mΩ
dB at GHz
Z ≤  mΩ
t
dB at GHz
Zt ≤  mΩ
dB at GHz
Z ≤  mΩ
t
Discharge test (corona) Extinction
8.4.7 Atmospheric pressure
at sea level voltage
≥    V
≥    V
≥    V
≥    V
Isolation 01 8.4.9 ≥   dB
Intermodulation level 8.4.8 dBm at GHz Under 2 carries of
(PIM3) +43 dBm
ADDITIONAL
ELECTRICAL
CHARACTERISTICS
+ Voltage values are RMS values at 40 Hz to 65 Hz, unless otherwise specified.

IEC 63138-1: Remarks including any
Ratings and Variant no.
2019 Value deviations from standard
characteristics designation
Subclause test methods
Mechanical
Soldering 8.5.1
Gauge retention
resilient contacts
8.5.5
– inner contact N
– outer contact N
Centre contact
captivation
– axial force N
8.5.2
– permitted Mm
displacement in each
direction
– torque N·m
Outer contact
8.5.3 N
captivation
Engagement and
separation forces and 8.5.4
torques
– axial force  ≤  N
– torque ≤  N·m
Mechanical
8.3.4 ≤  N
compatibility
Effectiveness of Bend radius and number of
clamping device revolutions
against cable rotation
………mm No. ………
(nutation of cable end)
01 8.5.6 Rotations
………mm No. ………
………mm No. ………
………mm No. ………
Effectiveness of Point of application and
clamping device duration
against cable pulling
N ………mm………s
01 8.5.7
N ………mm………s
N ………mm………s
N ………mm………s
Effectiveness of Length of cable and mass
clamping device
cycles ………mm………Kg
against cable bending
01 8.5.8 cycles ………mm………Kg
cycles ………mm………Kg
cycles ………mm………Kg
Effectiveness of Duration of applied torque
clamping device
…………s
against cable torsion
N·m N·m
01 8.5.9 …………s
N·m N·m
…………s
…………s
Strength of coupling
8.5.10 N
mechanism
2 (  g acceleration)
n
High frequency
8.5.12 m/s
vibration
( to ) Hz
– 26 – IEC 63138-2:2020 © IEC 2020
IEC 63138-1: Remarks including any
Ratings and Variant no.
2019 Value de
...