T&M non-inductive coaxial shunt SDN-414-01 high-frequency precision SDN-414 series current probe (2 Watt)Sic/GaN double-pulse Ids measurement

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

The SDN series is a non-inductive shunt designed to operate over a wide bandwidth and is suitable for AC and DC power systems; it is particularly important in impedance measurement and power calibration systems when phase angle and propagation delay are considered. It is very useful for adding or extending the current ranges 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 it well suited for phase protection relay, electricity meter, 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 key 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 resistance elements make them ideal for many steady-state applications. Therefore, each resistor series cites an average power rating suitable for continuous current loads. In circuits involving AC or high-duty-cycle pulsed currents, care should be taken not to exceed this rating, because overheating can damage the CVR. If required, we can supply resistors with special constructions that increase the standard power rating to high values, depending on the model.

Frequency response

The passband of a CVR is essentially flat from DC to an upper limit and is mainly determined by the skin effect in the resistance 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 is ±4% of nominal value. In addition, each unit is supplied with a precision 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

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

Global traceability

All measurements made with CVR series SDN shunts are traceable to national and international standards through 宝泰's measurement standards. All CVR series SDN shunts are supplied with a certificate of conformance required by quality assurance standards such as IEC 17025 / ISO 9001. Independent measurement certification can be provided using UKAS, A2LA, or Z540 / NAVLAP certificates.