Test & Measurement

Bench LCR meters feature up to 0.05% accuracy

24th March 2017
Mick Elliott

The bench LCR meter family at B&K Precision has been extended. Two new models take the family's test frequencies up to 1MHz. The 894 and 895 bench LCR meters provide test frequencies from 20Hz to 500kHz and 20Hz to 1MHz, respectively, and can measure inductance, capacitance and resistance with 0.05% basic impedance accuracy.

Both new bench LCR meters provide variable AC test signal levels from 5mVrms to 2Vrms, a built-in DC bias source, and three AC current ranges via the selectable 30/50/100ohm AC source impedance setting.

The 30ohm internal impedance setting provides up to 66.7mArms of drive current that is sufficient for testing large inductors and transformers.

With a full array of test features and remote interfaces including a handler interface, the instruments are ideal for characterising a wide variety of components in production and laboratory environments.

DC biasing is a commonly used method to measure the capacitance of ceramic, MLCC, polyester, and other types of capacitors with high dielectric constants.

Due to the change in capacitance when a DC voltage is applied, users must control the DC voltage to obtain a deterministic measurement result. B&K Precision's 894 and 895 LCR meters provide this capability with a built-in DC bias source adjustable from -5V to 5V.

The 894 and 895 models also feature an intuitive interface with a bright 4.3in. colour LCD display that displays both primary and secondary measurements along with all test signal parameters on one screen.

On the front panel, users can quickly access the built-in DC bias source function and easy-to-view zoom display mode with voltage and current monitoring. A USB host port enables external storage of measurement data logs, instrument setups, and screenshots.

Additionally, the new LCR meters provide auto level control, DC resistance measurement, a bin sorting function with pass/fail indicator, cable-length compensation, and a 201-point programmable list-sweep function.

An optional test fixture (TL89T1) is available for various transformer measurements: primary/secondary inductance (L1, L2), turns ratio (N, 1/N), mutual inductance (M), and direct current resistance (R2).

On the rear, the instruments offer a 36-pin handler interface for easy integration with a component handler and standard SCPI-compliant USB (USBTMC or Virtual COM), RS232, LAN interfaces for programming and remote control and GPIB (model 895).

Each unit is shipped with the following standard accessories: Kelvin clips, shorting bar, and 4-terminal test fixture for convenient measurement of axial and radial lead type components.

Available immediately, B&K Precision's new 894 and 895 bench LCR meters are backed with a three-year warranty.

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