The following change wording is based on the original DCR317 plus discussions, reviews and conclusions made by the ESCC Executive Secretariat and Manufacturer C&K since December 2007.
The following items detail all the changes proposed and replace the original contents of this DCR.
1 - Specification title on page 1 and in para 1.1 amended to also refer to 'PCB-type'.
2 - Spec Title & Para 1.1 & 2,
Delete reference to 3401/002 connectors.
Correct the titles for ESCC 3401 & 3401/001 as shown in the attachment.
3 - Table 1(a)
Add new Variants 21 to 24 with details as shown in the attachment.
Amend 'Rear End' column contents to be 'Straight Cable' or '90deg Cable' as applicable
4 - Table 1(a) & 2, amend 'MIL-C-17' to be 'MIL-DTL-17'
5 - Figure 1, add '0' labels to x & y axes for both figures
6 - Figure 2, Figures for new variants 21 to 24 added as shown in the attachment.
7 - Figure 2 (page 10) Maximum protrusion figure amended as shown in the attachment.
8 - Figure 2 (page 11) Dimension table. Dimensions for variants 21 to 24 added as shown in the attachment.
9 - Para 2, Delete items g & h and renumber remaining paras accordingly.
10 - Para 4.2.2, Delete item a.
11 - Para 4.2.4,
Correct the title to be '... Qualification Tests ... '
Correct the para references in items a, b & c per ESCC 3401 as shown in the attachment
Delete items d & e
12 - Para 4.2.4(c), Amend to read: '9.31 Solderability: Not applicable to Variants 11 to 20.'
13 - Para 4.2.5, Delete text and replace by items a & b as per amended para 4.2.4
14 - Para 4.3.1,
Correct para reference in 1st sentence to be 'Para. 9.6'
Add new sentence:
'Overall dimensions are specified with compatible inserts in ESCC Detail Specification No. 3401/001.'
15 - Para 4.3.3, Delete para in its entirety and replace by new para '4.3.13 Joint Strength (Variants 01 to 20)' as shown in the attachment.
Applied force is specified as 40Newtons minimum.
16 - Para 4.3.4, Delete para and move requirements to be part of Para 4.4.1.
17 - Para 4.3.5, 4.3.5.1 & 4.3.5.2, Correct the title to be 'Engagement and Separation Forces' (new para 4.3.9) and amend the paras as shown in the attachment.
New Variants 22 & 24 are added to the title of new para 4.3.9.1 and Variants 21 & 23 are added to the title of new para 4.3.9.2.
Both engagement & separation force limits (replacing 'Insertion') are included for outer & centre contacts in new paras 4.3.9.1 & 4.3.9.2.
Force units and values in new paras 4.3.9.1 & 4.3.9.2 are converted from grams-force to Newtons.
i.e.:
Outer contact engagement force in new para 4.3.9.1 is specified as 6.87Newtons maximum.
Outer contact separation force in new para 4.3.9.1 is specified as 0.83Newtons minimum.
Centre contact engagement force in new para 4.3.9.2 is specified as 3.33Newtons maximum (for max dia. test pin).
Centre contact separation force in new para 4.3.9.2 is specified as 2.22Newtons maximum (for max dia. test pin) & 0.28Newtons minimum (for min test pin dia.).
No limit is specified for centre contact engagement of the min dia. Test Pin.
18 - Para 4.3.6, 4.3.6.1, 4.3.6.2, Correct the title to be 'Contact Capability' (new para 4.3.3) and add new Variants 22 & 24 to the title of new para 4.3.3.1 and Variants 21 & 23 to the title of new para 4.3.3.2.
19 - Para 4.3.7, Amend to be new para 4.3.10
20 - Para 4.3.8, Delete 'Test' from title and amend to be new para 4.3.11
21 - Para 4.3.9, Add '(In Insert)' to title and amend to be new para 4.3.4.
22 - Para 4.3, Add new para '4.3.8 Contact Insertion and Withdrawal Forces' with text:
'The contact insertion and withdrawal forces shall be 65N maximum.'
23 - Para 4.3, Add new para '4.3.12 Solderability' with text:
'Not applicable to Variants 11 to 20. For all other Variants size A soldering iron shall be used.'
24 - Para 4.3, Add new paras 4.3.5, 4.3.6, 4.3.7 as shown in the attachment.
25 - Para 4.4.1, Delete 2nd sentence 'The contacts shall .... MIL-C-14500.' and replace with:
'Gold plating thickness shall be 1.27um minimum over 1um minimum of copper.'
26 - Para 4.4, Add new para '4.4.3 Magnetism Level' as shown in the attachment.
27 - TABLE 2, Correct the para references from ESCC 3401 as shown in the attachment.
28 - Para 4.8.6, Replace the 'Not applicable' by the text shown in the attachment.
29 - TABLE 6, Replace the table in its entirety by the new table 6 shown in the attachment.
Changes include:
- Delete item 'Female Contact Capability'
- Delete item 'Gold Plate Porosity'
- 'Contact Insertion and Withdrawal Forces' becomes part of new item 'Maintenance Aging'
- 'Crimp Visual Inspection' becomes part of new item 'Wiring'
- 'Solderability' is applicable to variants 01 to 10 & new variants 21 to 24
- 'Contact Resistance' becomes part of each applicable environmental/endurance test
- 'Crimp Tensile Strength', 'Pull Test' & 'Cable Retention Force' are replaced by 'Joint Strength'
- 'Contact Retention (In Insert)' is added to 'High Temperature Storage'
- 'Voltage Proof Altitude' becomes part of new item 'Climatic Sequence'
- New items are added as shown in the attachment: 'Wiring', 'Vibration, 'Shock or Bump', 'Climatic Sequence', 'Seal Test', Joint Strength', 'Rapid Change of Temperature', 'Contact Retention (In Insert)', 'Permanence of Marking', 'Mating/Unmating Forces', 'Corrosion', 'Insert Retention (In Shell)', 'Jackscrew Retention', 'High Temperature Measurements', 'Overload Test', 'Maintenance Aging', Engagement and Separation Forces'.
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Justification:
After a full, detailed technical and editorial review of 3401/004 issue 2 many amendments have been identified as being necessary in order to be able to logically implement the changes in the original DCR317. The original justification provided by C&K still applies and the justification for all changes is as follows.
Note - The changes do not include any resulting from the generation of new ESCC spec No.80 (for D*BM savers); A new round of changes to the range of 3401/*** specs will be necessary once ESCC spec No.80 is published, in due course.
Editorial changes, proposed for the purposes of clarity, consistency and completeness, are based on the requirements specified in ESCC Generic specification No.3401 issue 1 plus the format and contents of other ESCC Detail specifications for contacts (e.g. 3401/005 issue 4). Editorial changes include the following items above:
Items 2 3 4 5 9 10 11 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29
Specific technical changes are justified as follows:
Items 1, 3, 6, 7, 8, 17, 18, 29 - Introduction of new variants 21 to 24 per original DCR317.
Item 9, 25 - Definition of the plating materials & thickness' is considered sufficient without reference to the MIL specs; It is considered unnecessary to prescribe the actual material specifications to be applied by the Manufacturer (which will be controlled by their PID).
Items 12, 23, 29 - Solderability testing is applicable to solder & PCB contacts. The iron size proposed is the standard used by Manufacturer C&K.
Items 15, 29 - The force applied during the joint strength test on coaxial contacts needs to be specified in the detail spec. The value proposed is the standard used by Manufacturer C&K.
Item 17 - Both engagement and separation forces need to be specified (related to the Contact Capability limits). The values proposed are the standard values as defined by Manufacturer C&K.
Items 22, 29 - The contact insertion and withdrawal forces are not currently specified. The value proposed is the standard used by Manufacturer C&K.
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Justification:
as above
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