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3.5 Digit DC Nanoammeter

Saelig Nanoranger05 November 2021 - Saelig Company introduced the NanoRanger NR-01 - an affordable, highly accurate 3.5-digit DC ammeter designed for accurately measuring very low currents. With automatic dynamic ranging (9 ranges across 8.5 decades), NanoRanger measures currents from 1nA up to 800mA with a maximum resolution of 10pA. Each instrument is supplied factory calibrated, eliminating the requirement for high-cost precision components in the design, and thus keeping the purchase price low.

The current is measured with a 12-bit ADC which is oversampled and automatically averaged to produce a 16-bit result. Samples are taken every 170uS. Readings are shown every 300mS, built up from 180 averaged samples to eliminate line noise (both 50 Hz and 60 Hz). An alternative 'Fast Sample' Mode can sample at 150 measurements per second.

The backlit 11-digit 128 x 64 LCD display provides a wealth of information for current readings; for instance, mA, uA, nA, and pA are all on one line. A Running Average reading (current and time elapsed) allows the user to measure power consumption of specific events, such as radio transmissions. The Range Coverage Bar shows the ranges covered during the measurement; it can be ‘bracketed’ or limited to just one range. A signal-to-noise ratio display shows how much noise, or AC, is present on the current signal. Minimum and maximum ranges can be adjusted to limit the auto-ranging, or fixed at a single range.

Challenges arise when trying to measure the power consumption of low power circuits operating in offline or standby mode. Typically, current consumption falls into the nA or pA ranges that are beyond the capability of most DMMs, but the NanoRanger measures accurately into these ranges. A 6.5 digit DMM with 1nA resolution may only have a lowest range of 2.000000mA, and the absolute accuracy may only be +/- 500nA. The NanoRanger has selectable ranges for every decade of measurement.

NanoRanger is designed with a fully isolated USB interface for device control and data export. Being fully isolated means that a USB connection will not adversely affect the measurements.

NanoRanger is designed by UK-based AltoNovus, which specializes in designing and building low power products. Aimed at the low power development community, including IoT and energy harvesting technologies, NanoRanger is available now from Saelig Company, Inc.

www.saelig.com/



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