Triaxial Adapter
Equipment Accessories, Probe Station
Precision Connections for Sensitive Measurements
Connect your equipment effortlessly with our affordable triaxial adapters
Overview | Specifications | Related Products | Resources and Support
When working with precision instruments, the right connection matters. Many source measure units, semiconductor parameter analyzers, and other low-current test instruments use triaxial connectors to achieve ultra-low leakage and high shielding performance. But in many lab setups, the device under test is equipped with a standard coaxial BNC, SMA, or similar connection. That’s where our triaxial-to-coaxial adapters come in.
These adapters make it easy to interface triaxial-connectorized instruments with BNC-based devices and cables while maintaining signal integrity, shielding, and safety. Their applications can include:
- Semiconductor device testing – connect your differential interface, BNC-based probe station, or DUT interface to triaxial-instrument ports.
- Source measure unit connections – safely adapt triaxial outputs to standard coaxial test leads.
- Low-current measurements – maintain shielding and reduce leakage when direct triaxial connections aren’t required.
- Cable and system extension – bridge between triaxial and coaxial cabling without rebuilding your entire setup.
Specifications
| Frequency Range | DC - 500 MHz |
|---|---|
| Withstanding Voltage | 1200 Vrms |
| Characteristic Impedance | Non-constant |
| Contact Resistance | <3 mOhm |
| Insulation Resistance | >5000 MOhm |
| Durability (Mating) | >500 cycles |
Choosing the Right Configuration
When adapting a 3-conductor triaxial interface to a 2-conductor coaxial one, handling the extra guard conductor correctly is key. Our adapters are designed with well-considered grounding and shielding schemes:
Type 1 (Floating Shield)
- Triaxial guard connected to coaxial shield
- Triaxial shield left floating
- Driven triaxial guard also drives coaxial shield and exposed connector shell (shock hazard)
- Preserves low-leakage properties through the cables
- Use only with extreme caution
Type 2 (Floating Guard)
- Coaxial and triaxial shields connected
- Triaxial guard left floating
- Eliminates shock hazards of driven shields
- Preserves EMI shielding and low-leakage properties where they matter most
- Best choice for most general-purpose DC measurements
Type 3 (Grounded Guard)
- Coaxial and triaxial shields connected, guard shorted to ground
- Maintains EMI shielding, but not guarding functionality
- Suitable only when your instrument's guard is not actively driven
Our Type 2 floating-guard adapters are strongly recommended for most users, providing the best balance of safety, shielding, and measurement fidelity.
Product Details
| Product Code | Diagram | Description | Recommended Use |
|---|---|---|---|
| C2022A1 |
 |
TRB-M to BNC-F, Type 2 | Connect directly to your triaxial-instrument port and attach a BNC cable. |
| C2022B1 |
|
TRB-F to BNC-M, Type 2 | Use with a triaxial cable from your instrument, then plug into a BNC device. |
| C2022C1 |
|
TRB-F to BNC-F, Type 2 | Perfect for joining a triaxial cable to a coaxial one. |
| C2022D1 |
 |
TRB-F to TRB-F | Extend your triaxial cables while maintaining full guarding performance. |
| C2022E1 |
 |
TRB-F to BNC-F, Type 3 | Connect triaxial to coaxial when guard is not driven. |
| C2022F1 |
|
TRB-M to BNC-F, Type 3 | Direct instrument connection to coaxial cables, guard tied to ground. |
Related Products
Resources
Triaxial and Coaxial Cables
The right cable, on the other hand, preserves the integrity of your signal from source to destination. Triaxial cables provide active guarding, which is essential for the most sensitive low-current and high-impedance measurements.
Read more...