T&M non-inductive coaxial shunt nut SSDN-414-10 high-frequency precision resistor current probe (2 Watt)Sic/GaN double-pulse Ids measurement

About the SDN series current viewing resistor / non-inductive coaxial shunt

The SDN series are non-inductive shunts designed to operate over a wide bandwidth and are suitable for AC and DC power systems; they are particularly critical in impedance measurement and power calibration systems when phase angle and transmission delay are considered. They are very useful for adding to or extending the current range of power analyzers, power meters, phase-angle meters, frequency response analyzers, and multimeters. Used with a phase-angle meter, the SDN series can measure phase angle between voltage-voltage, voltage-current, or current-current, making them well suited for phase protection relays, electricity meters, and current transformer calibration.

CVRs are rugged high-frequency resistors designed to withstand very high peak power and current inputs generated by capacitor banks, pulse generator systems, and steady-state current loads. Their linear response over a wide frequency band provides an accurate indication of current magnitude without inductive elements. Inherent in CVR design is the coupling among major electrical parameters such as resistance, passband, energy capacity, and power rating. This means we offer a broad range of standard units covering a wide range of specifications.

Power rating

Although most CVRs are primarily designed for surge current measurement, their rugged construction and low-temperature-coefficient resistive elements make them ideal for many steady-state applications. Therefore, each resistor series specifies an average power rating suitable for continuous current loads. In circuits involving AC or high-duty-cycle pulse currents, care should be taken not to exceed this rating, as overheating may damage the CVR. If required, we can provide resistors with special constructions that increase the standard power rating to higher values depending on the model.

Frequency response

The passband of a CVR is essentially flat from DC to an upper limit, determined mainly by skin effect in the resistive element. The relevant passband is based on the 10% to 90% rise-time response to a current step function generated by a coaxial-line pulse generator. The di/dt of the test pulse exceeds 10^12 A/s.

Resistance value

Unless otherwise specified, the resistance tolerance of the resistor is ±4% of the nominal value. In addition, each unit is provided with a precise resistance measurement by Kelvin bridge, accurate to ±0.2%. We can provide a wide range of special resistance values for any of our standard units.

Mechanical design

The housing construction of all coaxial CVRs is silver-plated brass. The standard output signal connector is BNC; other connectors are available. Large coaxial CVRs use high-current flanges and coaxial threaded stud input connections. Powertek's flat-configuration CVRs, the W series, were originally developed for flat-plate transmission line mounting, are available in a wide range of unit widths and input configurations, and have been found particularly useful in applications requiring resistors with very high energy and power ratings.

Global traceability

All measurements made using CVR series SDN shunts are traceable to national and international standards through Powertek's measurement standards. All CVR series SDN shunts are supplied with certificates of conformance required by quality assurance standards (such as IEC17025 / ISO9001). Independent measurement certification is available using UKAS, A2LA, or Z540 / NAVLAP certificates.