Electrical Cables for Video and Data Systems

Electrical cables are assemblies of one or more conductors with insulation and protective jackets used to transmit power, control signals, or high‑speed data between photonic modules, drivers, detectors, motion stages, and control electronics. They ensure defined impedance, low loss, and electromagnetic compatibility so that analog, digital, or RF signals maintain integrity from source to load. In lab and OEM systems, they often link lasers, TEC controllers, photodiodes, and DAQ units in mixed-signal environments.

Coaxial cables (e.g., RG‑58, SMA‑terminated RF cables) use a central conductor, dielectric, shield, and jacket to provide controlled characteristic impedance (typically 50 Ω) and are used for RF, high‑speed modulation, and low‑noise detector signals. Twisted pair and multi‑pair cables use balanced conductors twisted to reduce common‑mode noise and are typical for low‑frequency analog, differential signals (e.g., RS‑485), encoders, and stepper/servo motor phases. Multi‑core cables bundle multiple insulated conductors (often with shielding per pair or overall) for compact routing of power, control, and feedback lines to stages, laser heads, and instruments.

Voltage rating specifies the maximum continuous operating voltage the insulation can withstand without breakdown, typically from tens to hundreds of volts for instrumentation cables and up to kilovolt ranges for high‑voltage supply lines. Insulation and jacket materials (PVC, PE, PTFE, FEP, silicone) determine dielectric constant, temperature rating, flexibility, chemical resistance, and outgassing, all critical in vacuum or cleanroom setups. Shielding (braid, foil, or combined) reduces EMI/RFI susceptibility and emissions; its coverage, material, and termination quality directly affect noise performance for low‑level photodiode or PMT signals.

Electrically, consider characteristic impedance, capacitance per unit length, conductor gauge (current capacity and voltage drop), insulation resistance, and attenuation at your signal frequency range. Mechanically, evaluate minimum bend radius, flex life (for dynamic cable chains), outer diameter, jacket material compatibility with your environment, and connectorization options (e.g., SMA, LEMO, D‑Sub, M12). For precision systems, also check temperature rating, outgassing requirements, and whether the cable is rated for drag‑chain or continuous‑flex operation.

Use off‑the‑shelf cables when your application matches standard impedance, length, connector types, and environmental ratings, as this simplifies sourcing and replacement. Choose custom harnesses when you need specific pin‑outs, mixed signal types in one bundle (power, analog, digital, feedback), nonstandard lengths or bend geometries, or special materials (low‑outgassing, halogen‑free, ultra‑flex). Custom assemblies can reduce bulk and mis‑wiring risk in complex optical benches or rack systems, but typically require longer lead times and higher NRE costs.

Standard coax, hook‑up, and instrumentation cables with common connectors are often available from stock or within 1–2 weeks, whereas custom harnesses with specific lengths, labeling, overmolding, or unique connectors can range from 3–8 weeks depending on complexity and volume. Typical customization options include conductor count and gauge, shielding scheme, jacket material, cable labeling, breakout styles, and pre‑terminated connector sets. Costs are mainly driven by conductor material (e.g., tinned copper vs. high‑flex alloys), shielding and jacket type, connector quality, assembly labor, test requirements (continuity, hipot, impedance), and order quantity.

On FindLight, you can search for "electrical cables" and then use filters such as cable type (coaxial, multi‑core, high‑voltage), conductor gauge, impedance, voltage rating, temperature rating, and connector type to narrow results. Each product page lists structured specifications and datasheets so you can compare key parameters across suppliers in separate tabs or windows. To request a quote without registration, use the “Request Quote” or contact form on the product page, specify desired quantity and any customization (length, connectors, harnessing), and your inquiry is sent directly to the vendor.