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TTI (Thurlby Thandar Instruments) has introduced a more accurate version of its LCR400 precision RCL bridge.

The instrument, which features a built-in four-terminal test fixture and a full limits comparator for component sorting, now incorporates new analogue circuitry to improve the performance in terms of both accuracy and resolution.

The LCR400 bridge has a basic accuracy of 0.1 per cent for R, L and C measurements.

Three measurement frequencies are available, between 100Hz and 10kHz.

The instrument is fully auto-ranging (with range hold) and can also automatically select the function based on the component inserted.

It has dual five-digit displays using large and bright LEDs.

The second display is used for the secondary parameter of Q or D and is also used with the limits comparator for showing binning information.

The LCR400 has a built-in high-quality four-terminal test fixture that will directly accept most wire-ended components.

A pair of plug-in pillar adapters enables axial components, such as bandoliered resistors, to be measured directly without bending the wires.

The position of the test fixture on the instrument ensures that component bandoliers can be handled without interfering with the display or keyboard.

An external test fixture can also be used.

A capacitance null function allows up to 100pF to be nulled out.

A switchable bias voltage is provided for polarising electrolytic capacitors.

The instrument incorporates a full limits comparator with binning.

Up to eight pass bins can be defined, along with two fail bins, and binning can be used to sort different tolerances of the same value or multiple different values.

A numeric keyboard allows rapid setting up of binning values.

Non-volatile memory is provided for the storage of up to nine complete instrument set-ups.

For surface-mount components, high-quality four-terminal tweezers are available.

The tweezers connect directly into the built-in test fixture of the LCR400.

Four-terminal connection is made at the base of the gold-plated jaws only a few millimetres from the tip.

An RS232 interface is incorporated that allows connection to a PC and can be used to set up all measurement and sorting functions as well as store readings.

PC software is supplied that allows both set-up and results logging.

The LCR400 costs GBP645 (plus VAT).

Thurlby Thandar Instruments

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