Machine Vision Lens for Wire Harness and Crimp Terminal Inspection: How to Check Wire Presence, Terminal Insertion, Crimp Position and Harness Assembly

Wire harness and crimp terminal inspection is a demanding machine vision application because one completed harness may contain many wires, cavities, terminals, seals and insertion points packed into a relatively small connector or assembly area. A production system may need to verify whether every wire is present, confirm that each terminal has reached the correct insertion position, identify a partially inserted terminal, check crimp position, distinguish an incorrectly routed wire, verify cavity occupancy and confirm that seals or grommets are seated in the expected location. Selecting the correct machine vision lens for wire harness inspection therefore requires far more than obtaining a clear image of the connector. The optical system must allocate enough usable pixels to every critical terminal, wire and assembly feature while retaining sufficient field of view to capture the complete inspection region.

Buyers searching for machine vision lens for wire harness inspection, crimp terminal inspection camera lens, wire presence inspection system, terminal insertion inspection machine vision, electrical harness inspection camera, crimp quality inspection lens, or industrial camera lens for cable assembly inspection are usually trying to solve the same optical problem: a complete harness may need to fit inside one image while individual terminals and wires can be only a small fraction of the total field. A camera can produce an image in which every wire appears visible to an operator yet still provide insufficient spatial sampling for a small terminal insertion error or narrow crimp-position deviation. The Machine Vision Lens therefore has to be chosen from the smallest required assembly difference, not simply from the overall connector or harness dimensions.

Kyptec Automation® provides a broad Machine Vision Lens portfolio covering multiple focal lengths and conventional 5 MP, 10 MP and 25 MP resolution classes across 2/3", 1" and larger-format lens families. Its current conventional portfolio includes several focal lengths from wider 8 mm, 12 mm and 16 mm options through 25 mm, 35 mm and 50 mm configurations, giving OEM machine builders and system integrators flexibility to design wider multi-wire inspection systems as well as tighter terminal-level inspection stations.

Start With the Smallest Harness Assembly Error That Must Be Rejected

Wire harness inspection can contain several levels of difficulty. Detecting a completely missing wire is generally easier than detecting a wire that is present but inserted into the wrong cavity. Confirming that a terminal exists can be easier than determining whether it is short of its final insertion position. Similarly, identifying a grossly incorrect crimp position is easier than measuring a small displacement between the insulation, conductor and crimp region.

The Machine Vision Lens should therefore be selected around the smallest visible assembly error that determines rejection. If a terminal is allowed to move only a small distance before the harness becomes unacceptable, that displacement should be translated into the required image resolution. If the inspection must detect a narrow exposed-conductor region or a slightly displaced wire seal, that feature may become the true optical design requirement even though the complete harness is much larger.

Wire Presence Inspection Is the First Level of Harness Verification

Wire presence inspection asks whether the expected wire exists at the required cavity or position. This can often be performed by locating the wire insulation, wire end or another visible feature and comparing it with the expected harness pattern.

The optical requirement depends on wire diameter and the total FOV. If a harness contains only a few large wires, each conductor may occupy a substantial part of the image. If the same camera inspects a dense connector with many small wires, each wire receives fewer sensor pixels. A machine vision lens for wire presence detection should therefore be selected from the smallest wire that must be verified rather than the largest conductor in the assembly.

Wire Presence and Correct Wire Position Are Different Inspections

A wire can be present but located in the wrong cavity or routed through the wrong position. Presence alone does not verify the assembly.

For position inspection, the vision system needs a reference such as the connector body, cavity pattern or another repeatable harness feature. The Machine Vision Lens should include enough connector geometry to establish the expected wire locations while still providing sufficient resolution to distinguish adjacent cavities.

This becomes particularly important in dense harness assemblies where cavity pitch can be small compared with the complete connector width.

Terminal Insertion Depth Can Be More Demanding Than Wire Presence

A terminal may be inserted into the correct cavity but stop short of its specified final location. If the inspection view exposes a terminal shoulder, retention feature, wire-to-connector reference or other visible geometry, machine vision can compare its location with the expected insertion position.

The smallest permitted insertion-depth error should drive the required pixels per millimetre.

A whole-harness image may work perfectly for wire counting while providing too little resolution to distinguish a terminal that is only slightly under-inserted. For terminal insertion inspection, the Machine Vision Lens should therefore be selected around the minimum positional difference that must be detected.

Calculate Pixels per Millimetre Before Selecting the Lens

A practical starting calculation is:

Pixels per millimetre = number of sensor pixels across the inspection direction ÷ physical field of view in millimetres

If 4,000 horizontal pixels cover a 100 mm connector and harness region, the simplified image sampling is approximately 40 pixels/mm. A 0.5 mm terminal displacement would correspond to around 20 pixels before other system effects are considered.

If the same camera is configured to cover 200 mm, sampling drops to approximately 20 pixels/mm, and the same physical displacement now occupies only around 10 pixels.

This relationship is one reason unnecessarily large FOV can weaken terminal-position and crimp inspection even when the camera itself has not changed.

Connector Cavity Pitch Is a Useful Optical Design Input

Dense connectors can contain many terminals separated by relatively small cavity pitch.

When the inspection must determine whether each wire occupies the correct cavity, the Machine Vision Lens should provide enough pixels across one cavity-to-cavity interval for neighboring positions to remain clearly distinguishable.

The number of cavities across the connector is therefore an important purchasing input. A twenty-position connector places very different demands on the camera-lens system than a four-position connector of similar total width.

A 16 MM 10 MP Lens Can Support Broader Harness Coverage

For compatible 2/3" camera systems, the Kyptec Automation® KL-1226 16 MM Machine Vision Lens With 10 MegaPixel & 2/3" Format Lens provides a 16 mm focal length, 10 MP resolution, C-mount, 2/3" image format and F2.8–16 aperture range. Kyptec Automation® lists this model for industrial automation, automotive, electronics and other machine vision applications.

This focal-length class can be evaluated where a complete connector face, several wire rows or a moderate harness region needs to remain visible. The final choice should be based on actual sensor dimensions, working distance, connector width and the smallest wire or terminal displacement that must be resolved.

Crimp Inspection Requires a Clearly Defined Crimp Reference

A crimped terminal can contain several visible regions: the conductor, insulation, terminal body and crimped sections. The relevant inspection feature depends on the manufacturing requirement.

If the objective is to check whether the crimp lies at the correct position along the wire, the optical system needs a visible reference such as the insulation end or terminal geometry. If the requirement is to check whether conductor or insulation extends into a defined region, the Machine Vision Lens needs enough sampling across those narrow boundaries.

The inspection should therefore define exactly which crimp edges determine acceptance before selecting FOV and focal length.

Crimp Position and Crimp Shape Should Not Be Treated as the Same Measurement

A terminal crimp can be located correctly but have an unexpected visible profile. Conversely, the crimp geometry may appear normal while its position relative to the wire is incorrect.

Position inspection measures location relative to a reference. Shape inspection evaluates contour or relative geometry.

A Machine Vision Lens intended for crimp terminal inspection should provide enough local resolution to support whichever of these conditions the machine must classify.

Conductor Exposure Can Become the Smallest Inspection Feature

In some harness assemblies, a short section of conductor or insulation boundary may be visible near the terminal.

If production acceptance depends on that boundary remaining within a specified region, the relevant physical feature can be much smaller than the wire diameter.

A broad harness image may therefore be adequate for wire presence while under-resolving conductor exposure. The smallest expected visible conductor or insulation difference should be included in the optical-resolution calculation.

Terminal Orientation Can Be Verified When Its Geometry Is Visible

A terminal may be present and inserted but rotated into an incorrect orientation.

Where the terminal contains asymmetric visible geometry, machine vision can compare the detected shape with the expected orientation.

The lens should provide enough detail for those asymmetric features to remain distinguishable. If orientation is determined from a very small terminal feature, additional pixels per terminal may be required compared with simple presence detection.

A 25 MM 10 MP Lens Can Provide More Controlled Terminal Framing

For compatible 2/3" camera systems, the Kyptec Automation® KL-1228 25 MM Machine Vision Lens With 10 MegaPixel & 2/3" Format Lens provides a 25 mm focal length, 10 MP resolution, C-mount, 2/3" format and F2.8–16 aperture range.

This type of configuration can be considered where one connector, terminal group or crimp region can be framed more tightly. Reducing unnecessary FOV can place more sensor pixels on individual wires and terminals, which is particularly useful when terminal insertion or crimp position is more demanding than general harness presence inspection.

Harness Assembly Inspection Should Use the Connector as a Coordinate Reference

Harnesses can move slightly inside a fixture from cycle to cycle.

If every terminal is compared only with fixed image coordinates, a small whole-harness shift can appear as multiple terminal-position errors.

A stronger inspection approach is to locate a stable connector or housing feature first and establish a local coordinate system. Individual wires and terminals can then be measured relative to that connector geometry.

The Machine Vision Lens should therefore include the reference features required for this alignment rather than framing only isolated wire ends.

Multi-Row Connectors Create an FOV-versus-Resolution Trade-Off

A connector with several rows of terminals requires enough vertical and horizontal FOV to capture the complete cavity matrix.

As more rows and columns are included, each terminal occupies a smaller proportion of the sensor.

The Machine Vision Lens should therefore be evaluated using pixels available per terminal cavity, not only total connector width.

For high-density connectors, higher total optical resolution can become valuable because the FOV cannot always be reduced without losing required cavities.

High-Resolution Larger-Format Lenses Can Help With Dense Harness Assemblies

Where many small terminals need to remain visible simultaneously, increasing the total image resolution can provide more spatial samples across the same required field.

For compatible larger-format systems, the Kyptec Automation® KL-1238 16 MM Machine Vision Lens With 25 MegaPixel & 1.1" Format Lens provides a 16 mm focal length, 25 MP resolution, C-mount and F2.8–16 aperture range. Its official product title identifies it as a 1.1" format Machine Vision Lens.

This type of configuration can be evaluated where a larger harness or multi-row connector must fit inside the image while individual wires and terminal positions still require substantial spatial sampling.

A 25 MM 25 MP Lens Can Balance Connector Coverage and Terminal Detail

For compatible larger-format systems requiring more controlled high-resolution framing, the Kyptec Automation® KL-1240 25 MM Machine Vision Lens With 25 MegaPixel & 1.1" Format Lens provides a 25 mm focal length, 25 MP resolution, C-mount and F2.8–22 aperture range. The official product title uses the 1.1" format designation.

This type of Machine Vision Lens can be useful where one dense connector or harness section should occupy more of the sensor while preserving high total resolution for cavity-by-cavity inspection.

Higher Megapixel Resolution Should Improve Pixels per Terminal

A higher-resolution lens-camera combination is most useful when the extra pixels remain concentrated on the actual connector and harness.

If the FOV is expanded at the same time, the expected improvement in terminal sampling may be reduced.

The stronger design method is to determine the minimum legitimate connector and harness FOV first, then use increased optical resolution to improve pixels per wire, pixels per cavity and pixels per crimp feature.

Wire Diameter Variation Should Be Included in Qualification

A harness production line may process several wire gauges.

If the same inspection station is used for different harness variants, the smallest wire can become the limiting optical feature.

A system designed using only a large-diameter cable may not provide adequate detail when the line changes to thinner wires.

Each harness family should therefore be checked for wire diameter, cavity pitch, connector size and minimum terminal-position tolerance.

Different Wire Colors Do Not Eliminate the Need for Adequate Spatial Resolution

Wire color can help distinguish neighboring conductors, but the Machine Vision Lens must still provide enough spatial sampling for the system to locate the correct physical wire position.

A color difference does not compensate for a wire that occupies too few pixels or overlaps heavily with neighboring features.

For robust wire-position inspection, geometric visibility and adequate optical resolution remain important even when color information is available.

Grommet and Wire Seal Position Can Be Included in Harness Inspection

Harness connectors can contain seals or grommets associated with individual wires or groups of conductors.

If the relevant seal boundary is visible, the vision system can verify presence and position relative to the connector or wire.

These features may be considerably smaller than the connector housing itself.

The Machine Vision Lens should therefore provide sufficient local resolution if wire seal inspection is part of the production requirement.

Partially Seated Seals Need More Resolution Than Missing Seals

A completely missing seal can create a large visible difference.

A seal that is present but displaced by a small amount can be much harder to identify.

As with terminal insertion, the optical design should therefore use the smallest permitted seal-position error rather than simple seal presence as the qualification condition.

Terminal Push-Out Can Be Inspected From the Appropriate Side

A terminal can appear correctly inserted from one view while being displaced in a direction that is poorly visible from that camera angle.

If the inspection must detect terminal push-out, the viewing direction should expose the relevant positional change.

The Machine Vision Lens can only provide resolution on geometry that is physically visible in the chosen image. Selecting the correct inspection view is therefore as important as selecting focal length.

Harness Routing Inspection Requires a Larger Geometric Context

Some wire harness stations need to verify not only terminal insertion but also whether wires follow the expected route between retention points or connector locations.

This inspection requires a larger FOV than a localized crimp station.

When routing and terminal inspection are combined in one image, the system must balance overall harness coverage with terminal-level resolution.

For very large harnesses, separate inspection views can sometimes allocate sensor resolution more efficiently than forcing the complete assembly into one wide image.

A 35 MM 1-Inch Lens Can Support Greater Camera Stand-Off

Harness assembly machinery can contain presses, fixtures, insertion tooling and handling mechanisms that limit how close the camera can be positioned.

For compatible 1" camera systems, the Kyptec Automation® KL-1218 35 MM Machine Vision Lens With 10 MegaPixel & 1" Format Lens provides 35 mm focal length, 10 MP resolution, C-mount, 1" image format and F1.4–16 aperture range.

This focal-length class can be evaluated where a smaller connector or terminal group needs controlled framing from greater stand-off because machine construction prevents closer camera placement.

Localized Crimp Inspection Can Benefit From a Longer Focal Length

A dedicated crimp inspection station may not need to capture the complete harness.

If only one terminal or a small group of terminals is inspected, a tighter FOV can devote far more sensor pixels to the relevant conductor, insulation and crimp boundaries.

This is particularly useful when small crimp-position differences must be measured and sufficient working distance is available.

A 50 MM 25 MP Lens Can Support High-Detail Local Terminal Inspection

For compatible larger-format camera systems where localized terminal or crimp inspection requires high total resolution and tighter framing, the Kyptec Automation® KL-1244 50 MM Machine Vision Lens With 25 MegaPixel & 1.1" Format Lens provides a 50 mm focal length, 25 MP resolution, C-mount and F2.8–22 aperture range. Its official product title identifies it as a 1.1" format Machine Vision Lens.

This type of lens can be evaluated where one crimp, terminal row or small connector region should occupy a larger proportion of the sensor and complete-harness coverage is unnecessary.

Wire End Height Variation Can Affect Focus

Harness wires and terminals do not always lie on exactly the same object plane.

A bent wire, raised terminal or connector feature can sit closer to or farther from the camera.

If the inspection needs several height levels to remain simultaneously sharp, the operating aperture and working distance should be qualified across that depth range.

The focus should not be optimized only on the connector housing if the smaller crimp or conductor feature lies on another plane.

Aperture Should Balance Depth of Field and Fine Terminal Detail

Stopping down the aperture can increase the range of object heights that remain acceptably focused.

However, excessively small apertures can reduce fine spatial detail through diffraction.

For harness inspection, the aperture should therefore be established using the smallest real wire, terminal boundary or crimp-position variation across the valid depth range.

The goal is adequate focus tolerance without sacrificing the local edge definition required for terminal-level inspection.

Bent or Lifted Wires Can Change Their Apparent Position

A wire that rises above the connector plane can appear laterally displaced because of perspective even when its base position is correct.

This is especially relevant when flexible conductors have significant free length.

Where precise position is required, the harness should be presented as consistently as practical and the vision system should reference features near the actual insertion region rather than remote unsupported wire sections.

Connector Tilt Can Create Multiple Apparent Terminal Errors

If the connector body tilts relative to the camera, the cavity matrix can become geometrically displaced across the image.

Without compensation, the inspection software may interpret one mechanical presentation error as many individual terminal-position defects.

Including stable housing references inside the FOV allows the system to establish connector pose before evaluating cavity occupancy and terminal position.

Crimp Inspection Should Use Real Production Limit Samples

A terminal with a completely missing wire is useful for early system setup, but it is not an adequate qualification sample for a precision crimp station.

Final validation should include minimum allowed and rejectable terminal insertion, small crimp-position changes, borderline conductor exposure, seal displacement and other assembly conditions close to the true production limits.

These samples should be tested at several image locations if multiple cavities or harness positions are inspected.

Digital Zoom Cannot Recover Missing Crimp Detail

Enlarging a terminal image in software does not increase the physical information captured by the camera.

If a critical crimp boundary occupies only two or three original sensor pixels, digital enlargement simply makes those same pixels appear larger on the screen.

Improving physical sampling requires a more suitable FOV, focal length, working distance, sensor resolution or Machine Vision Lens configuration.

Why Kyptec Automation® Is a Practical Choice for Wire Harness and Crimp Terminal Inspection

Kyptec Automation® provides a broad Machine Vision Lens collection with conventional 5 MP, 10 MP and 25 MP options across multiple focal lengths and several industrial camera formats. The current collection includes 2/3", 1" and larger-format Machine Vision Lens families covering wider focal lengths for larger harness fields as well as longer focal lengths for more localized terminal inspection.

For compatible 2/3" systems, Kyptec Automation® KL-1226 16 MM Machine Vision Lens With 10 MegaPixel & 2/3" Format Lens provides a wider 16 mm option for broader connector or harness coverage, while Kyptec Automation® KL-1228 25 MM Machine Vision Lens With 10 MegaPixel & 2/3" Format Lens provides more controlled framing where individual wires and terminals need greater sensor utilization.

For compatible larger-format high-resolution systems, Kyptec Automation® KL-1238 16 MM Machine Vision Lens With 25 MegaPixel & 1.1" Format Lens can be evaluated where a wider multi-terminal field and high total resolution need to coexist, while Kyptec Automation® KL-1240 25 MM Machine Vision Lens With 25 MegaPixel & 1.1" Format Lens provides tighter high-resolution framing. For local terminal or crimp inspection requiring more image scale and sufficient stand-off, Kyptec Automation® KL-1244 50 MM Machine Vision Lens With 25 MegaPixel & 1.1" Format Lens provides a longer-focal-length high-resolution alternative.

This breadth makes Kyptec Automation® a practical choice for OEMs and system integrators designing harness inspection equipment because lens selection can be based on the actual connector size, wire diameter, cavity count, terminal tolerance, sensor format and machine working distance rather than forcing one general-purpose focal length onto every inspection station.

Frequently Asked Questions About Machine Vision Lenses for Wire Harness and Crimp Terminal Inspection

1. What is the best Machine Vision Lens for wire harness inspection?

The correct Machine Vision Lens depends on connector size, number of wire cavities, smallest wire diameter, required terminal-position tolerance, camera sensor format and working distance. Whole-harness inspection usually requires a broader FOV, while local terminal or crimp measurement benefits from tighter framing. Kyptec Automation® offers multiple focal lengths across conventional 5 MP, 10 MP and 25 MP Machine Vision Lens families, allowing the lens to be matched to the actual harness geometry rather than selecting from focal length alone.

2. How much resolution is required for crimp terminal inspection?

The resolution should be calculated from the smallest crimp-position or boundary variation that must be rejected. Determine the physical FOV first, calculate pixels per millimetre and then estimate how many sensor pixels represent the required tolerance. A terminal can appear very clear while a small crimp displacement remains under-resolved, so acceptance tolerance rather than terminal size should determine the optical requirement.

3. Can machine vision detect a missing wire in a connector?

Yes, when the expected wire or insertion feature is visible in the chosen inspection view. The system can compare each connector cavity with the expected harness pattern and identify an unoccupied position. The Machine Vision Lens should provide enough pixels across the smallest wire and cavity so missing-wire detection remains reliable throughout the complete connector field.

4. Can machine vision detect a wire inserted into the wrong connector cavity?

Yes. The system can first establish connector position from stable housing references and then compare wire locations with the expected cavity matrix. Adequate cavity-to-cavity sampling is important because adjacent wires can be physically close together. The Machine Vision Lens should therefore be selected with connector pitch and the number of cavities in mind.

5. How can machine vision check terminal insertion depth?

Terminal insertion can be inspected when a visible terminal feature, wire reference or connector relationship changes with insertion depth. The system compares that feature with the expected position and rejects terminals outside the allowed range. The minimum insertion error should be translated into pixels at the final FOV before selecting the Machine Vision Lens.

6. Is a 16 mm Machine Vision Lens suitable for wire harness inspection?

It can be when the resulting physical FOV matches the connector or harness region. For compatible 2/3" systems, Kyptec Automation® KL-1226 16 MM Machine Vision Lens With 10 MegaPixel & 2/3" Format Lens provides a 16 mm, 10 MP C-mount configuration with a 2/3" image format and F2.8–16 aperture range. It can be evaluated where several wire cavities or a wider connector region must remain in one image.

7. When should a 25 mm Machine Vision Lens be considered for terminal inspection?

A 25 mm lens can be useful where the connector or terminal group fits within a more controlled FOV and additional pixels per feature are valuable. Kyptec Automation® KL-1228 25 MM Machine Vision Lens With 10 MegaPixel & 2/3" Format Lens provides a 25 mm, 10 MP option for compatible 2/3" cameras with C-mount and F2.8–16 aperture range. Final suitability should be calculated from sensor size, working distance and required terminal FOV.

8. Can one camera inspect all wires in a multi-row connector?

Yes, if the complete connector fits inside the required field while each cavity and terminal still receives enough sensor pixels. As cavity count increases, resolution is distributed across more features. Dense multi-row connectors may therefore benefit from a higher-resolution compatible optical system or a tighter FOV if all surrounding harness area is not required.

9. Can machine vision inspect crimp position and wire presence in the same image?

Yes, provided both the wire and crimp reference features are visible and sufficiently resolved. Wire presence is typically a larger-feature inspection, while crimp position may require substantially finer spatial sampling. The Machine Vision Lens should therefore be selected according to the more demanding crimp-position tolerance when one image is expected to perform both tasks.

10. When should a 25 MP Machine Vision Lens be considered for wire harness inspection?

A 25 MP configuration becomes useful when many small terminals or wires must remain visible simultaneously and reducing the FOV is not practical. Kyptec Automation® offers several 25 MP Machine Vision Lens focal lengths for compatible larger-format systems, allowing OEMs to choose between broader and tighter high-resolution views. The additional resolution should be used to increase pixels on each connector cavity rather than to capture unnecessary machine background.

11. Which Kyptec Automation® lens can be considered for wider high-resolution multi-terminal inspection?

For compatible larger-format systems, Kyptec Automation® KL-1238 16 MM Machine Vision Lens With 25 MegaPixel & 1.1" Format Lens provides a 16 mm focal length, 25 MP resolution, C-mount and F2.8–16 aperture range. This type of configuration can be evaluated where a relatively wide multi-row harness or connector field must remain visible while high total optical resolution is required.

12. Which Kyptec Automation® lens can provide tighter high-resolution connector framing?

For compatible larger-format systems, Kyptec Automation® KL-1240 25 MM Machine Vision Lens With 25 MegaPixel & 1.1" Format Lens provides a 25 mm focal length, 25 MP resolution, C-mount and F2.8–22 aperture range. It can be considered where one dense connector should occupy more of the sensor and terminal insertion or crimp position needs stronger spatial sampling.

13. Can a 35 mm Machine Vision Lens help when the camera must be mounted farther from the harness?

Yes. For compatible 1" camera systems, Kyptec Automation® KL-1218 35 MM Machine Vision Lens With 10 MegaPixel & 1" Format Lens provides a 35 mm focal length, 10 MP resolution, C-mount and F1.4–16 aperture range. This focal length can be evaluated where insertion tooling or fixture construction prevents close camera mounting.

14. Can a 50 mm Machine Vision Lens be used for detailed crimp inspection?

Yes, when sufficient working distance is available and the inspection is localized. Kyptec Automation® KL-1244 50 MM Machine Vision Lens With 25 MegaPixel & 1.1" Format Lens provides a 50 mm, 25 MP C-mount configuration with F2.8–22 aperture range for compatible larger-format systems. Tighter framing can allocate substantially more sensor pixels to a small crimp or terminal region.

15. Can machine vision verify a wire seal or grommet position?

Yes, when the seal or grommet has a visible boundary or position reference in the selected view. The system can compare seal presence and location with the expected wire or connector geometry. Partially displaced seals normally require greater image detail than completely missing seals, so the smallest acceptable position difference should be included in lens selection.

16. Why can a vision system detect a missing wire but fail to detect a partially inserted terminal?

A missing wire creates a large visual difference within the expected cavity, while a partially inserted terminal may move only a small distance from its correct position. The second condition therefore requires substantially finer spatial sampling. The Machine Vision Lens should be selected around the minimum terminal insertion error if both defects must be detected by the same inspection system.

17. What information should I provide before buying a Machine Vision Lens for wire harness inspection?

Provide connector width and height, number of cavities and rows, cavity pitch, smallest wire diameter, required terminal insertion tolerance, crimp-region dimensions, minimum visible defect size, sensor format and camera resolution, available working distance, connector-position tolerance and whether the entire harness or only a localized terminal group must fit inside one image. These parameters allow a Kyptec Automation® Machine Vision Lens to be evaluated according to actual FOV, pixels per terminal and inspection geometry rather than focal length alone.

Design Wire Harness Inspection Around the Smallest Terminal-Level Assembly Error

Reliable wire harness inspection requires recognizing that missing-wire detection, correct cavity verification, terminal insertion measurement, crimp-position inspection and seal placement operate at different physical scales. A complete harness can appear sharp while a small terminal displacement or crimp-position error remains inadequately represented. The Machine Vision Lens should therefore be selected around the smallest wire, terminal or assembly variation that determines production acceptance.

The strongest optical design begins with connector size, cavity count, wire diameter, terminal insertion tolerance and crimp dimensions. The minimum required FOV is then established from the complete connector region and legitimate mechanical position variation. Pixels per millimetre and pixels per cavity can be calculated from the planned camera resolution, after which focal length, sensor format and working distance are selected so the harness uses the available image sensor efficiently. Real minimum rejectable wire, terminal, crimp and seal conditions should then be tested across center and outer connector positions before production qualification.

Kyptec Automation® provides a comprehensive Machine Vision Lens portfolio spanning multiple focal lengths and conventional 5 MP, 10 MP and 25 MP optical resolution classes across several industrial camera formats. By matching the appropriate Kyptec Automation® Machine Vision Lens to connector dimensions, wire count, cavity pitch, terminal tolerance, sensor format and available working distance, OEM machine builders and system integrators can establish a stronger optical foundation for wire presence inspection, terminal insertion verification, crimp-position analysis, seal-position inspection and automated wire harness assembly quality control.