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keithley-sc-22-triaxial-cable---50-ohm-guarded-coax, keithley-sc-22-triaxial-cable---50-ohm-guarded-coax, /triaxial-coaxial-cable
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Tech & Material: 50Ω dual-shield SPCS/PTFE cable with graphite triboelectric noise suppression.
Scenario & Effect: Built for lab engineers to eliminate leakage for femtoamp-level precision.
Certifications: ISO & RoHS certified quality.
The Keithley SC-22 low noise triaxial cable engineered by Zhenjiang Worldpeak Communication Co., Ltd. is a high-precision, dual-shielded interconnect designed specifically for low-current instrumentation and semiconductor parametric testing. Featuring a 50 ohm impedance, solid silver-plated copper conductor, and PTFE dielectric insulation, this Keithley SC-22 low noise triaxial cable minimizes dielectric leakage and triboelectric noise. The integrated semiconductor graphite layer isolates shield layers to safeguard sub-picoamp signals. Ideal for source-measure units (SMUs), electrometers, and probe stations, the Keithley SC-22 low noise triaxial cable provides exceptional signal integrity, stability, and mechanical durability in demanding testing environments.
Precision electrical measurements require specialized interconnect systems capable of eliminating micro-ampere to femtoampere error sources. Standard coaxial cables suffer from dielectric leakage and friction-induced charge, making them unsuitable for sensitive low-current testing. The Keithley SC-22 low noise triaxial cable from Zhenjiang Worldpeak Communication Co., Ltd. resolves these measurement barriers through an advanced multi-layer construction.
The Keithley SC-22 low noise triaxial cable incorporates two independent concentric shields separated by high-grade insulation. The inner shield functions as a driven guard, maintained at the exact electrical potential of the center conductor. This architecture forces the voltage gradient across the primary PTFE dielectric to near zero, eliminating leakage current paths.
To counteract triboelectric noise—charge generated when a low noise triax cable flexes and the dielectric rubs against the braid—Zhenjiang Worldpeak Communication Co., Ltd. applies a specialized semiconductor graphite coating over the outer PTFE layer. The outer silver-plated copper shield provides robust electromagnetic interference (EMI) protection while serving as the return path for guard currents. Enclosed in a 6.60 mm FEP outer jacket, this Keithley cable delivers thermal resistance spanning -55°C to +200°C alongside superior mechanical strength.
Advanced Dual-Shield Architecture: Features separate inner and outer silver-plated copper braids for active guarding and EMI shielding.
Low Noise Graphite Coating: Incorporates a specialized graphite layer to neutralize triboelectric charges caused by cable bending.
PTFE High-Isolation Dielectric: Provides exceptional volume resistivity and thermal stability across harsh operating environments.
Precise 50 Ohm Impedance: Matches standard high-frequency test instrumentation, reducing signal reflection in dynamic testing.
Durable FEP Outer Jacket: Protects internal layers against abrasion, chemicals, and extreme temperatures ranging from -55°C to +200°C.
Instrument-Grade Compatibility: Engineered for seamless integration with 3-lug TRB connectors and Keithley SMU equipment.
| Parameter | Specification | Engineering Details |
| Primary Keyword | Keithley SC-22 low noise triaxial cable | Precision SMU measurement cable |
| Impedance | 50 Ohm | Characteristic impedance |
| Center Conductor | Solid Silver-Plated Copper | High conductivity core |
| Inner Dielectric | PTFE | Primary conductor insulation |
| Inner Shield | Silver-Plated Copper Braid | Driven guard shield |
| Outer Dielectric | PTFE with Graphite Coating | Noise-suppression layer |
| Outer Shield | Silver-Plated Copper Braid | EMI ground shield |
| Outer Jacket | 6.60 mm FEP | Protective outer sheath |
| Velocity of Propagation | 70% | Reference propagation speed |
| Capacitance | 95 pF/m | Low parasitic capacitance |
| Operating Temperature | -55°C to +200°C | Wide thermal operational range |
| Minimum Bend Radius | 35 mm | Mechanical flexure limits |
| Cable Weight | 0.060 kg/m | Bulk cable mass |
| Connector Support | 3-Lug TRB / Custom | Compatible with Keithley cable interfaces |
When measuring sub-nanoampere currents, the insulation resistance of standard cable dielectrics allows minute currents to leak from the center conductor to the ground shield. The Keithley SC-22 low noise triaxial cable manufactured by Zhenjiang Worldpeak Communication Co., Ltd. circumvents this issue by enabling a guarded circuit topology. By driving the inner shield to the same voltage as the signal conductor using a unity-gain buffer inside the SMU, the electrical potential difference across the inner dielectric becomes virtually zero. Without a voltage potential, leakage current cannot flow, preserving femtoamp-level accuracy.
Physical movement, flexing, or vibration of a standard coaxial cable causes mechanical friction between the dielectric and metallic braid. This friction generates static electricity—known as the triboelectric effect—which injects spurious noise currents into the signal path. Zhenjiang Worldpeak Communication Co., Ltd. solves this by utilizing a conductive graphite layer between the outer PTFE dielectric and the inner shield. This low-resistance layer bleeds off accumulated static charges before they corrupt sensitive low-current readings.
vs. Standard Coaxial Cable: Standard coax offers single-layer shielding, leaving low-current measurements vulnerable to dielectric leakage. The guarded coaxial cable design of the Keithley SC-22 low noise triaxial cable reduces effective leakage current by several orders of magnitude.
vs. Twinaxial Cable: Twinax uses two center conductors for differential signal transmission. The Keithley SC-22 low noise triaxial cable uses a single center conductor with two concentric shields specifically designed for single-ended guarded measurements.
Semiconductor Parametric Testing: Critical for connecting source-measure units to wafer probe stations during I-V and C-V characterization, ensuring accurate femtoamp leakage analysis.
High-Impedance Instrumentation: Used with electrometers and high-resistance meters to prevent input bias current errors in high-resistivity material testing.
Capacitance-Voltage (C-V) Characterization: Serves as a low-noise interconnect for measuring semiconductor junction capacitance where cable parasitics must remain constant.
Research Laboratory Setup: Essential interconnect choice for physics, nanotechnology, and advanced materials research requiring complete signal isolation.
Partnering with Zhenjiang Worldpeak Communication Co., Ltd. provides global enterprise clients with robust commercial and technical advantages:
Custom Cable Assembly:Zhenjiang Worldpeak Communication Co., Ltd. offers factory-terminated low noise triax cable assemblies featuring 3-lug TRB, BNC triax, or customized connector configurations.
Quality Assurance & Testing: Every SMU measurement cable assembly produced by Zhenjiang Worldpeak Communication Co., Ltd. undergoes rigorous isolation testing between inner guard and outer ground shields to guarantee zero defect delivery.
OEM Customization & Logistics: Bulk orders can be customized with sequential length markings, specialized reel packaging, and anti-static protective wrapping. Zhenjiang Worldpeak Communication Co., Ltd. supports volume B2B procurement with flexible manufacturing lead times.
A guarded coaxial cable like the Keithley SC-22 low noise triaxial cable supports driven guard configurations. By keeping the inner shield at the same potential as the center conductor, leakage current across the primary dielectric is virtually eliminated, which is essential for accurate low-current testing below 1 nA.
This low noise triax cable is primarily designed for 3-Lug TRB connectors compatible with standard Keithley instrumentation. Zhenjiang Worldpeak Communication Co., Ltd. can also provide custom terminations based on project specifications.
The Keithley SC-22 low noise triaxial cable incorporates a specialized graphite coating on the outer PTFE dielectric. This conductive graphite layer neutralizes friction-induced triboelectric charges generated during cable flexure, preventing current noise from entering the measurement circuit.
