CAD to CH Converter

CAD to CH Conversion Explained

Converting .CAD (PCB drawings) to .CH (Chromatography data files) transforms spatial, vector-based electronic design data into a 1D time-series format used in analytical chemistry. This conversion bridges two completely unrelated data models. Users typically perform this conversion to feed spatial node densities or trace lengths into peak-detection algorithms designed for chemical analysis.

When you convert .CAD to .CH, you gain compatibility with chromatography software. However, you lose all visual layout, layer definitions, component metadata, and electrical routing. The conversion destroys the physical PCB design to create a synthetic chromatogram. For standard electronic design workflows, this conversion is a bad idea and usually indicates a misunderstanding of file extensions.

Typical Tasks and Users

This conversion serves a very narrow set of experimental workflows:

• Data Scientists: Mapping 2D spatial density from PCB layouts into 1D time-series arrays to test machine learning algorithms on synthetic data.
• Algorithm Developers: Using complex PCB trace lengths to generate mock chromatogram peaks for testing baseline-correction software.
• Archivists: Attempting to force numerical design metrics into legacy laboratory information management systems (LIMS) that only accept .CH files.

Software & Tool Support

No standard software natively bridges Electronic Design Automation (EDA) and analytical chemistry. You must use domain-specific tools or custom scripts.

• .CAD Tools: EDA software like AutoCAD, Altium Designer, and KiCad create and edit PCB drawings.
• .CH Tools: Chromatography data systems (CDS) like Agilent OpenLab, Waters Empower, and the open-source OpenChrom read and analyze chromatograms.
• Conversion Methods: Manual conversion requires writing Python scripts using libraries like ezdxf to extract vector coordinates, flattening the data into an array, and using chemstation-ch libraries to encode the binary .CH format.

Pros and Cons of the Conversion

• Pros: Allows PCB spatial data to be processed using advanced peak-integration, smoothing, and baseline-correction algorithms built into chromatography software.
• Cons: Complete loss of 2D and 3D geometry. Total destruction of electrical netlists and component placement.
• File Size: The resulting .CH file can bloat significantly if high-resolution spatial coordinates are mapped to high-frequency time steps.
• Editability: .CH files are designed as raw, read-only instrument outputs. Once converted, the data cannot be edited or converted back into a functional .CAD file.

Conversion Difficulties & Why Convert.Guru

The technical problem in this conversion is dimensional reduction. .CAD files use Cartesian coordinates (X, Y) and vector shapes to define physical objects. .CH files use a single time axis and a detector response value (such as milli-Absorbance Units). The conversion pipeline must flatten 2D space into a 1D array. During this process, font handling, layer mapping, and layout geometry are completely discarded.

Convert.Guru handles this complex mapping automatically. The engine extracts trace lengths and node densities from the .CAD file, converts them into a synthetic time-series signal, and encodes them into a valid .CH binary structure. This provides a clean, mathematically accurate data transformation without requiring users to write custom Python scripts.

CAD vs. CH: What is the better choice?

Which format should you choose?

Choose .CAD if you are designing, editing, or manufacturing printed circuit boards. Choose .CH if you are operating a gas or liquid chromatograph and need to record detector signals.

You should avoid converting .CAD to .CH unless you are conducting a specific cross-domain data analysis experiment. If you need to share PCB designs for manufacturing or review, convert your .CAD files to .Gerber or .PDF instead.

Conclusion

Converting .CAD to .CH is an extreme edge case that forces spatial electronic design data into a time-series chemical analysis format. The biggest limitation to watch for is the permanent loss of all visual layout and electrical logic, making the file useless for actual PCB manufacturing. For researchers and data scientists who specifically require this synthetic data mapping, Convert.Guru provides a reliable, automated pipeline to handle the exact .CAD to .CH conversion accurately.