AltoNovus ΩhmRanger-LCV (TT-OR-01) Low-Compliance Voltage Ohmmeter

Features*

Low stimulus voltages, selectable between approx 380mV or approx 205mV.

• Stimulus voltage at the output terminal is limited by the maximum current supply of approx 20mA.
• Accurate readings from >100M to 10 Ohms.
• A 128 x 64 LCD display gives a wealth of information about your Resistance readings.
• A large display shows MΩ, KΩ, and Ω, all on one line.
• Readings every 400mS, built up from 160 samples and averaged to tune out mains noise (both 50 Hz and 60 Hz).
• Fully isolated USB Interface for device control and readings export.
• SNR display indicates noise level on signal.
• On-screen confirmation of stimulus voltage.
• Range Bar movement after every reading shows that ΩhmRanger-LCV™ is operating correctly.
• Range Coverage Bar shows the ranges covered during the measurement.
• User-configurable Auto Power-off timer.
• ΩhmRanger-LCV™ is highly portable with dimensions of 148 x 90 x 30mm.
• 2 x AA batteries should give around 150 hours of operation.

* Features may be subject to change.

A Real Customer Need - Met

The Josephson Junction is the Quantum Computer's equivalent of a 'transistor'. Although it is delicate, the ΩhmRanger-LCV™ can measure its resistance without risking its integrity.

D-Wave Systems, the Quantum Computing systems and services company, needs to measure the resistance of their Josephson Junctions. Working closely, a prototype Low Compliance Voltage Ohmmeter was quickly developed and the design was subsequently refined through testing and practical lab use. The result is the ΩhmRanger-LCV™, the low compliance voltage ohmmeter, scheduled for general release in October 2021.

On completion of test and evaluation, D-Wave commented;

"The AltoNovus ΩhmRanger-LCV turned an error-prone measurement into a simple measurement ..... a valuable addition to our work building quantum computers."

"The fundamental element in D-Wave's unique product is a Josephson Junction - this is the "transistor" in a quantum computer. In practice, these devices are extremely sensitive and easy to damage. Measuring the resistance with a standard multimeter will destroy the Josephson Junction.

The AltoNovus ΩhmRangerLCV turned an error-prone measurement into a simple measurement. The low compliance voltage ensures that the device under test never sees a stimulus above 400mV. The ΩhmRanger-LCV measures a wide resistance range, and the upper end of the range (400MOhm) ΩhmRanger-LCV makes it simple. This, in addition to a nice group of features, including a quality metric - signal-to-noise, continual indication of the stimulus voltage, and a cute mode for measuring microscopic pins while looking through a microscope, makes this device a valuable addition to our work building quantum computers."