ASTM E1129/E1129M-14
(Specification)Standard Specification for Thermocouple Connectors
Standard Specification for Thermocouple Connectors
ABSTRACT
This specification covers separable single-circuit thermocouple connectors with two round pins. The widespread use of thermocouple connectors requires standardization of mating dimensions and performance characteristics. Connectors shall be constructed as either plugs or jacks, and these two forms shall be designed to connect with each other. Contact resistance test, thermal gradient test, and insulation resistance test shall be performed to meet the requirements prescribed.
SIGNIFICANCE AND USE
4.1 The widespread use of thermocouple connectors requires standardization of mating dimensions and performance characteristics.
4.2 This specification describes standardized thermocouple connector dimensions and capabilities and includes test procedures suitable for evaluating the performance of a particular specimen or design. The tests described are not intended for routine inspection or rapid testing of large groups of connectors or for quality control purposes.
SCOPE
1.1 This specification covers separable single-circuit thermocouple connectors with two round pins. Connectors covered by this specification must be rated for continuous use to at least 300 °F (150 °C), but they may optionally be rated higher.
1.2 This specification does not cover multiple-circuit connectors, multi-pin connectors, miniature connectors, or connectors intended primarily for panel mounting. High temperature connectors (for example, those designed for continuous use at temperatures above approximately 500 °F (260 °C)) are not intended to be covered by this specification.
1.3 The values stated in either inch-pound units or SI units are to be regarded separately as standard.
1.4 The following precautionary statement pertains only to the test method portion, Section 9, of this specification. This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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Designation: E1129/E1129M −14
StandardSpecification for
Thermocouple Connectors
ThisstandardisissuedunderthefixeddesignationE1129/E1129M;thenumberimmediatelyfollowingthedesignationindicatestheyear
of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval.
A superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 3. Terminology
1.1 This specification covers separable single-circuit ther- 3.1 Definitions—The definitions given inTerminology E344
mocouple connectors with two round pins. Connectors covered
shall apply.
bythisspecificationmustberatedforcontinuoususetoatleast
3.2 Definitions of Terms Specific to This Standard:
300 °F (150 °C), but they may optionally be rated higher.
3.2.1 connector pair, n—an assembly consisting of a plug
1.2 This specification does not cover multiple-circuit
and a jack, each having both positive and negative inserts, that
connectors, multi-pin connectors, miniature connectors, or
will connect two parts of an electrical circuit and provide a
connectors intended primarily for panel mounting. High tem-
means of physically disconnecting the two parts without the
perature connectors (for example, those designed for continu-
use of tools.
ous use at temperatures above approximately 500 °F (260 °C))
3.2.2 contact insert, n—metallic conductor assemblies that,
are not intended to be covered by this specification.
when installed in connector bodies, provide connections be-
1.3 The values stated in either inch-pound units or SI units
tween two parts of an electrical circuit. Plug connectors will
are to be regarded separately as standard.
contain projecting prong contacts, while jack connectors will
contain recessed socket or receptacle contacts.
1.4 The following precautionary statement pertains only to
the test method portion, Section 9, of this specification. This
3.2.3 service life, n—interval of time that a connector
standard does not purport to address all of the safety concerns,
assembly will be put to use and retain all physical and
if any, associated with its use. It is the responsibility of the user
thermoelectric properties.
of this standard to establish appropriate safety and health
3.2.4 test difference, n—apparent thermoelectric difference
practices and determine the applicability of regulatory limita-
attributabletomatedconnectorsobservedbythetestprocedure
tions prior to use.
of this specification.
2. Referenced Documents
4. Significance and Use
2.1 The following documents of the latest issue form a part
4.1 The widespread use of thermocouple connectors re-
of this specification to the extent referenced herein. In case of
quires standardization of mating dimensions and performance
conflict between this specification and another referenced
characteristics.
document, this specification shall take precedence.
2.2 ASTM Standards: 4.2 This specification describes standardized thermocouple
connector dimensions and capabilities and includes test proce-
E230/E230M Specification and Temperature-Electromotive
Force (EMF) Tables for Standardized Thermocouples dures suitable for evaluating the performance of a particular
specimen or design. The tests described are not intended for
E344 Terminology Relating to Thermometry and Hydrom-
etry routineinspectionorrapidtestingoflargegroupsofconnectors
or for quality control purposes.
E608/E608M Specification for Mineral-Insulated, Metal-
Sheathed Base Metal Thermocouples
5. Classification
5.1 Plugs or Jacks:
This specification is under the jurisdiction of ASTM Committee E20 on
Temperature Measurement and is the direct responsibility of Subcommittee E20.04
5.1.1 Connectors shall be constructed as either plugs or
on Thermocouples.
jacks, and these two forms shall be designed to connect with
Current edition approved Sept. 1, 2014. Published January 2015. Originally
ε1
each other.
approved in 1986. Last previous edition approved in 2008 as E1129 – 08 . DOI:
10.1520/E1129_E1129M-08E01.
5.1.2 Plug connectors shall have two external prong con-
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
tacts of differing diameters to prevent improper mating. The
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
negative prong shall be the larger, as shown in Table 1 and Fig.
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. 1.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
E1129/E1129M − 14
TABLE 1 Dimensions
Minimum, Maximum,
A
Dimension Symbol
in. (mm) in. (mm)
Body length L . 1.505 (38.23)
Body width W . 1.088 (27.64)
Body thickness T . 0.515 (13.08)
Length of prong P 0.535 0.650 (16.51)
(13.59)
Depth of socket J 0.650 .
(16.51)
Prong spacing X 0.432 0.442 (11.23)
(10.97)
Positive pin D1 0.152 (3.86) 0.158 (4.02)
diameter
Negative pin D2 0.182 (4.62) 0.190 (4.83)
diameter
Location of detent E 0.180 (4.57) 0.200 (5.08)
Depth of detent F 0.010 (0.25) 0.025 (0.64)
Width of detent G 0.040 (1.02) .
A
Symbols are according to Fig. 1.
5.2.1 Connectors shall be produced in versions to match
each of the standardized ANSI/ASTM thermocouple types as
given in Table 2.
5.2.2 The insert materials of each plug and jack shall have
thermoelectric properties conforming to the characteristics of
extension grade material of the corresponding thermocouple
type as given in Specification E230/E230M over the tempera-
ture range specified in Table 3.
5.2.3 Calibration conformance and gradient testing is not
applicable to Type B thermoelectrically neutral (Cu/Cu) con-
nectors.
6. Ordering Information
6.1 Orders for connectors under this specification shall
include the following:
6.1.1 Quantity of plugs or jacks (specify which),
6.1.2 ANSI/ASTM thermocouple type (see Table 2),
6.1.3 Anyoptionalaccessoriesthatmayberequired,suchas
those listed in 7.4.3,
6.1.4 Special testing requirements, and
NOTE 1—A solid prong is shown for clarity of design.
TABLE 2 Identification
FIG. 1 Thermocouple Connector Dimensions, (see Table 1)
ANSI ⁄ ASTM Body Color
Type Coding
T Blue
5.1.3 Jack connectors shall have two internal socket con-
J Black
E Purple
tacts sized and spaced to receive and accommodate the prong
K Yellow
contacts of the mating plug. Jack connectors shall also include
N Orange
a means of producing and maintaining sufficient contact R or S Green
A
B (Cu/Cu) White
pressure to meet all of the other requirements of this specifi-
A
Uncompensated (Cu/CU) connectors are customarily used with Type B
cation.
thermocouples.
5.2 ANSI/ASTM Type:
E1129/E1129M − 14
TABLE 3 Specifications
Characteristic Min Max Requirement Test Procedure
Operating Temperature 0 °F 300 °F 7.1.2 9.7
(−18 °C) (150 °C)
Engagement Force 6 lbf 18 lbf 7.2.4 9.5
(27 N) (80 N)
Disengagement Force 6 lbf 18 lbf 7.2.4 9.5
(27 N) (80 N)
Contact resistance (each leg) . 0.04 ohms 7.2.7 9.2
Insulation resistance at Room 10 ohms . 7.3.4 9.4
Temperature
Insulation Resistance at 7.3.4 9.4
300 °F (150 °C)
Thermal Gradient . ±2 °F 7.2.8 9.3
(±1.1 °C)
Repeated cycles (Engagement) 25 . 7.2.5 9.6
6.1.5 Requirements for certificates of conformance to the 7.2.5 The connector pair shall be capable of repeated
specifications or reports of the results of any required testing. insertion and withdrawal cycles as given in Table 3 without
losing the ability to conform to the requirements of this
7. Materials and Manufacture specification.
7.2.6 The dimensions and locations of the inserts in the
7.1 Body:
connector bodies shall fall within the limits given in Table 1.
7.1.1 The dimensions of the connector bodies shall fall
7.2.7 The contact resistance between the assembled plug
within the limits given in Table 1.
and jack shall conform to the requirements of Table 3.
7.1.2 The connector body shall be made of an electrically
7.2.8 The connector pair shall be capable of passing the
insulating material capable of continuous use at any tempera-
thermal gradient test specified in Table 3.
ture between 0 °F (-18 °C) and 300 °F (150 °C) for the service
life given in Table 3, without losing its ability to conform to
7.3 Construction and Assembly:
this specification.
7.3.1 Wire attachment shall be by means of a screw or
7.1.3 The connector bodies shall be color coded in accor-
clamp suitable for use with wire diameters from 30AWG (0.01
dance with Table 2 to provide rapid and permanent identifica-
in. or 0.25 mm) in diameter to 18 AWG (0.04 in. or 1.0 mm)
tion of the thermocouple calibration with which it is designed
in diameter.
to be used. Each plug and jack shall be permanently marked
7.3.2 Contact inserts and wire attaching parts shall be held
with a symbol or symbols to identify positive and negative
captive to one of the body parts.
conductorinserts.Allconnectorsshallbearthesupplier’sname
7.3.3 Connections and final closures of the connector shall
or other means of source identification, unless otherwise
be accomplished with simple hand tools such as screwdrivers,
specified in the purchasing documents.
wrenches, or pliers.
7.1.4 An insulating barrier shall be incorporated into each
7.3.4 The assembled connector shall be capable of passing
connector body to prevent inadvertent contact between ther-
the insulation resistance requirements listed in Table 3 at the
moelements or wires.
temperatures listed.
7.2 Inserts:
7.3.5 The materials and construction used in the connector
7.2.1 Contact inserts may be either solid or hollow as long
shall be such that the connector will meet all of the specified
as all of the requirements of this specification are met.
requirements for the service life interval listed in Table 3.
7.2.2 Contact inserts shall be fabricated of materials that
7.4 Optional Accessories:
meet the requirements of Section 5.
7.4.1 Connector accessories are not covered by this speci-
7.2.3 The inside diameter and depth of the jack connector
fication and may be unique to a manufacturer’s specific design.
shall be such as to receive the corresponding plug prong
7.4.2 All required optional accessories are to be specified
smoothly and easily when inserted
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
´1
Designation: E1129/E1129M − 08 E1129/E1129M − 14
Standard Specification for
Thermocouple Connectors
This standard is issued under the fixed designation E1129/E1129M; the number immediately following the designation indicates the year
of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval.
A superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
ε NOTE—The year date was corrected editorially in July 2009.
1. Scope
1.1 This specification covers separable single-circuit thermocouple connectors with two round pins. Connectors covered by this
specification must be rated for continuous use to at least 300 °F (150 °C), but they may optionally be rated higher.
1.2 This specification does not cover multiple-circuit connectors, multi-pin connectors, miniature connectors, or connectors
intended primarily for panel mounting. High temperature connectors (for example, those designed for continuous use at
temperatures above approximately 500 °F (260 °C)) are not intended to be covered by this specification.
1.3 The values stated in either inch-pound units or SI units are to be regarded separately as standard.
1.4 The following precautionary statement pertains only to the test method portion, Section 9, of this specification.This standard
does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this
standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
2. Referenced Documents
2.1 The following documents of the latest issue form a part of this specification to the extent referenced herein. In case of
conflict between this specification and another referenced document, this specification shall take precedence.
2.2 ASTM Standards:
E230E230/E230M Specification and Temperature-Electromotive Force (EMF) Tables for Standardized Thermocouples
E344 Terminology Relating to Thermometry and Hydrometry
E608E608/E608M Specification for Mineral-Insulated, Metal-Sheathed Base Metal Thermocouples
3. Terminology
3.1 Definitions—The definitions given in Terminology E344 shall apply.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 connector pair, n—an assembly consisting of a plug and a jack, each having both positive and negative inserts, that will
connect two parts of an electrical circuit and provide a means of physically disconnecting the two parts without the use of tools.
3.2.2 contact insert, n—metallic conductor assemblies that, when installed in connector bodies, provide connections between
two parts of an electrical circuit. Plug connectors will contain projecting prong contacts, while jack connectors will contain
recessed socket or receptacle contacts.
3.2.3 service life, n—interval of time that a connector assembly will be put to use and retain all physical and thermoelectric
properties.
3.2.4 test difference, n—apparent thermoelectric difference attributable to mated connectors observed by the test procedure of
this specification.
4. Significance and Use
4.1 The widespread use of thermocouple connectors requires standardization of mating dimensions and performance
characteristics.
This specification is under the jurisdiction of ASTM Committee E20 on Temperature Measurement and is the direct responsibility of Subcommittee E20.04 on
Thermocouples.
Current edition approved Nov. 15, 2008Sept. 1, 2014. Published January 2009January 2015. Originally approved in 1986. Last previous edition approved in 20022008
ε1
as E1129 – 98E1129 – 08 (2002). DOI: 10.1520/E1129_E1129M-08E01.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
E1129/E1129M − 14
4.2 This specification describes standardized thermocouple connector dimensions and capabilities and includes test procedures
suitable for evaluating the performance of a particular specimen or design. The tests described are not intended for routine
inspection or rapid testing of large groups of connectors or for quality control purposes.
5. Classification
5.1 Plugs or Jacks:
5.1.1 Connectors shall be constructed as either plugs or jacks, and these two forms shall be designed to connect with each other.
5.1.2 Plug connectors shall have two external prong contacts of differing diameters to prevent improper mating. The negative
prong shall be the larger, as shown in Table 1 and Fig. 1.
TABLE 1 Dimensions
Minimum, Maximum,
A
Dimension Symbol
in. (mm) in. (mm)
Body length L . 1.505 (38.23)
Body width W . 1.088 (27.64)
Body thickness T . 0.515 (13.08)
Length of prong P 0.535 0.650 (16.51)
(13.59)
Depth of socket J 0.650 .
(16.51)
Prong spacing X 0.432 0.442 (11.23)
(10.97)
Positive pin D1 0.152 (3.86) 0.158 (4.02)
diameter
diameter
Negative pin D2 0.182 (4.62) 0.190 (4.83)
diameter
diameter
Location of detent E 0.180 (4.57) 0.200 (5.08)
Width of detent G 0.040 (1.02) .
Depth of detent F 0.010 (0.25) 0.025 (0.64)
Depth of detent F 0.010 (0.25) 0.025 (0.64)
Width of detent G 0.040 (1.02) .
A
Symbols are according to Fig. 31.
5.1.3 Jack connectors shall have two internal socket contacts sized and spaced to receive and accommodate the prong contacts
of the mating plug. Jack connectors shall also include a means of producing and maintaining sufficient contact pressure to meet
all of the other requirements of this specification.
5.2 ANSI/ASTM Type:
5.2.1 Connectors shall be produced in versions to match each of the standardized ANSI/ASTM thermocouple types as given in
Table 2.
5.2.2 The insert materials of each plug and jack shall have thermoelectric properties conforming to the characteristics of
extension grade material of the corresponding thermocouple type as given in Specification E230E230/E230M over the temperature
range specified in Table 3.
5.2.3 Calibration conformance and gradient testing is not applicable to Type B thermoelectrically neutral (Cu/Cu) connectors.
6. Ordering Information
6.1 Orders for connectors under this specification shall include the following:
6.1.1 Quantity of plugs or jacks (specify which),
6.1.2 ANSI/ASTM thermocouple type (see Table 2),
6.1.3 Any optional accessories that may be required, such as those listed in 7.4.3,
6.1.4 Special testing requirements, and
6.1.5 Requirements for certificates of conformance to the specifications or reports of the results of any required testing.
E1129/E1129M − 14
TABLE 2 Identification
ANSI/ASTM Body Color
Type Coding
T Blue
J Black
E Purple
K Yellow
N Orange
R or S Green
A
B (Cu/Cu) White
TABLE 2 Identification
ANSI ⁄ ASTM Body Color
Type Coding
T Blue
J Black
E Purple
K Yellow
N Orange
R or S Green
A
B (Cu/Cu) White
A
Uncompensated (Cu/CU) connectors are customarily used with Type B
thermocouples.
NOTE 1—A solid prong is shown for clarity of design.
FIG. 1 Thermocouple Connector Dimensions, (see Table 1)
7. Materials and Manufacture
7.1 Body:
7.1.1 The dimensions of the connector bodies shall fall within the limits given in Table 1.
7.1.2 The connector body shall be made of an electrically insulating material capable of continuous use at any temperature
between 0 °F (-18 °C) and 300 °F (150 °C) for the service life given in Table 23, without losing its ability to conform to this
specification.
7.1.3 The connector bodies shall be color coded in accordance with Table 2 to provide rapid and permanent identification of
the thermocouple calibration with which it is designed to be used. Each plug and jack shall be permanently marked with a symbol
or symbols to identify positive and negative conductor inserts. All connectors shall bear the supplier’s name or other means of
source identification, unless otherwise specified in the purchasing documents.
7.1.4 An insulating barrier shall be incorporated into each connector body to prevent inadvertent contact between
thermoelements or wires.
E1129/E1129M − 14
TABLE 3 Specifications
Characteristic Min Max Requirement Test Procedure
Operating Temperature 0 °F 300 °F 7.1.2 9.6
(−18 °C) (–150 °C)
Engagement Force 6 lb 18 lb 7.2.4 9.5
(27 N)
(80 N)
Disengagement Force 6 lb 18 lb 7.2.4 9.5
(27 N)
(80 N)
Contact resistance (each leg) . 0.04 ohms 7.2.7 9.2
Insulation resistance at Room 10 ohms . 7.3.4 9.4
Temperature
Insulation Resistance at 7.3.4 9.4
300 °F (150 °C)
Thermal Gradient . ±2 °F 7.2.8 9.3
(±1.1 °C)
Repeated cycles (Engagement) 25 . 7.2.5 9.6
TABLE 3 Specifications
Characteristic Min Max Requirement Test Procedure
Operating Temperature 0 °F 300 °F 7.1.2 9.7
(−18 °C) (150 °C)
Engagement Force 6 lbf 18 lbf 7.2.4 9.5
(27 N) (80 N)
Disengagement Force 6 lbf 18 lbf 7.2.4 9.5
(27 N) (80 N)
Contact resistance (each leg) . 0.04 ohms 7.2.7 9.2
Insulation resistance at Room 10 ohms . 7.3.4 9.4
Temperature
Insulation Resistance at 7.3.4 9.4
300 °F (150 °C)
Thermal Gradient . ±2 °F 7.2.8 9.3
(±1.1 °C)
Repeated cycles (Engagement) 25 . 7.2.5 9.6
7.2 Inserts:
7.2.1 Contact inserts may be either solid or hollow as long as all of the requirements of this specification are met.
7.2.2 Contact inserts shall be fabricated of materials that meet the requirements of Section 5.
7.2.3 The inside diameter and depth of the jack connector shall be such as to receive the corresponding plug prong smoothly
and easily when inserted. A spring loaded detent device shall be incorporated in the negative side of the jack connector to engage
the detent in the negative plug prong. The function of the detent system shall be to cause positive locking together of a plug and
jack when fully mated. The detent system shall not permit the two connectors to be separated by more than 0.03 in. (0.8 mm) when
subjected to a withdrawaldisengagement force less than the minimum given in Table 3.
7.2.4 The forces required for complete engagement or disengagement shall be within the limits listed in Table 3.
7.2.5 The connector pair shall be capable of repeated insertion and withdrawal cycles as given in Table 3 without losing the
ability to conform to the requirements of this specification.
7.2.6 The dimensions and locations of the inserts in the connector bodies shall fall within the limits given in Table 1.
7.2.7 The contact resistance between the assembled plug and jack shall conform to the requirements of Table 3.
7.2.8 The connector pair shall be capable of passing the thermal gradient test specified in Table 3.
7.3 Construction and Assembly:
7.3.1 Wire attachment shall be by means of a screw or clamp suitable for use with wire diameters from 30 AWG (0.01 in. or
0.25 mmmm) in diameter)diameter to 18 AWG (0.04 in. or 1.0 mmmm) in diameter).diameter.
7.3.2 Contact inserts and wire attaching parts shall be held captive to one of the body parts.
7.3.3 Connections and final closures of the connector shall be accomplished with simple hand tools such as screwdrivers,
wrenches, or pliers.
7.3.4 The assembled connector shall be capable of passing the insulation resistance requirements listed in Table 3 at the
temperatures listed.
7.3.5 The materials and construction used in the connector shall be such that the connector will meet all of the specified
requirements for the service life interval listed in Table 33.
7.4 Optional Accessories:
7.4.1 Connector accessories are not covered by this specification and may be unique to a manufacturer’s specific design.
7.4.2 All required optional accessories are to be specified separately from the connectors.
E1129/E1129M − 14
7.4.3 The following is a partial list of useful accessory items:
7.4.3.1 Cable clamping devices, for attaching flexible cables;
7.4.3.2 Clamps for rigid tubing and sheaths in a range of diameters as listed in Specification E608E608/E608M;
7.4.3.3 Elastomeric boots to seal connector assemblies against moisture in service;
7.4.3.4 Safety clamps or other devices to prevent inadvertent separation of connectors under conditions of severe vibration; and
7.4.3.5 Flat washers for use under wire attachment screw heads as an aid in the retention of the wires and prevent in preventing
damage to the wires.
7.4.4 Some suppliers may not offer all of the above items while others may offer additional items. Supplier catalogs and
literature should be consulted for details.
8. Physical Properties
8.1 The physical size of connectors conforming to this specification shall fall within the limits given in Table 1 for all
dimensions indicated in that table. All other dimensions and all details of construction shall be determined by a manufacturer’s
specific design.
9. Test Methods
9.1 Test Frequency: The following tests shall be conducted as either Qualification or Production tests as follows:Qualification
tests:
Paragraph Test Description Type
Number
9.2 Contact Resistance Qualification
9.3 Thermal Gradient Qualification
9.4 Insulation Resistance Qualification
9.5 Engagement/Disengagement Force Qualification
9.6 Repeated Cycle Test Qualification
9.6 Repeated Cycles Qualification
9.7 Service Life Test Qualification
9.7 Service Life Qualification
Tests listed as “Qualification” tests shall be initially performed by the manufacturer to demonstrate conformance to this
specification, and then periodically, as determined by the manufacturer, to verify that the connectors continue to meet the
requirements of this specification. Tests listed as “Production” tests shall be performed on all connectors produced and sold to this
specification.
9.2 Contact Resistance Test:
9.2.1 With the contacts at ambientroom temperature, a direct current of 1.0 A from a constant current source shall be passed
through one half (for example, the (the positive leg) of a mated connector pair (See Fig. 2). The voltage drop across that leg of
FIG. 2 Contact Resistance Test
the mated pair shall be measured and recorded. The procedure shall be repeated on the same leg of the mated connector pair but
with reversed polarity. The average of the two measured voltage drops shall be calculated to eliminate thermoelectrical any
thermoelectric effects. The contact resistance in ohms is then computed by dividing the average
...
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