42XXA Series of Four-Terminal Scanners

Measurements International’s series of low-thermal matrix scanners are ideal for automating precision measurements to sub-ppm accuracy. Choose from six available models (10-channel, 16-channel, and 20-channel), with either tellurium copper binding posts (A-series) or 2-metre four-conductor Teflon cables (B-series). Neither series requires continually changing leads when measuring groups of resistors, making these low-thermal precision scanners are ideal for use in automated resistance and thermometry applications where several artifacts need to be calibrated efficiently and accurately.

The input channels can be manually selected from the front panel or via the standard IEEE-488 remote interface system. Front panel LEDs enable the operator to quickly verify selected channels. Front panel LEDs indicate the selected channels. Additionally, the A and B boards are separated to improve the insulation resistance. Protection from selecting the same relay on both sides is also available on the rear panel IEEE address switch.

The thermally-isolated relay boards maintain equilibrium in the switching areas. The A and B boards are separated to improve the insulation resistance. Ultra-sensitive, high-efficiency, polarized, sealed relay technology eliminates self-heating. Sealed relays avoid contamination build-up commonly found in competitive scanners where contamination builds up between the relay contacts and the contacts on the printed circuit boards.

In the A-series of scanners, the copper terminals are mechanically connected to the copper pads on the relay boards to reduce the thermals normally generated by soldered connections, thus reducing switching errors. The model 4210A has 10 four-terminal input channels consisting of 40 tellurium copper binding posts and 2 four-channel outputs consisting of eight tellurium copper binding posts. The 4220A is also available in a 30 Amp model to handle currents up to 30 A (model 4220A/30).

The B-series features four-conductor Teflon cable inputs with 2 four-conductor Teflon cable outputs attached directly to the relay boards reducing the number of contacts. Each B-series scanner comes with a 2-metre lead. As an option, the leads can be extended to 3 or 4-metres.

The 4216A has 16 four-terminal tellurium copper binding posts and 2 outputs consisting of 8 tellurium copper binding posts. The model 4216B has 16 four-conductor Teflon cable inputs with 2 four-conductor Teflon cable outputs.

The 4220A has 20 four-terminal tellurium copper binding posts and 2 outputs consisting of 8 tellurium copper binding posts. The model 4220B has 20 four-conductor Teflon cable inputs with 2 four-conductor Teflon cable outputs.