Low stimulus voltages, selectable between approx 380mV or approx 205mV.
* Features may be subject to change.
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.
"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."
- whats_included: [{"whats_included":"ΩhmRanger-LCV™ (1)"},{"whats_included":"Instruction Leaflet"}] - condition: new - custom_product: false - mpn: OhmRanger - google_product_category: Electronics - custom_label_0: Meter - attachments: [{"download_file":[{"download_file":"Altonovus ΩhmRanger-LCV™ Low Compliance Voltage Ohmmeter User Manual"}],"download_filetype":[{"download_filetype":"pdf"}]}] - warranty: 12 months - brand: AltoNovus - key_feature_1: Handheld low-stimulus ohmmeter for delicate devices (10 Ω to >100 MΩ) with isolated USB/SCPI and SNR readout. - key_feature_2: Selectable Low Compliance Voltage (206 mV / 380 mV) - key_feature_3: 10 Ω To >100 MΩ Measurement Range - key_feature_4: Stimulus Current Limited To ~30 mA - key_feature_5: SNR Indicator With Min/Max Current Sampling - key_feature_6: Isolated Micro-USB & SCPI Control - manufacturer: AltoNovus - target_keyword: Altonovus OhmRanger-LCV - brands: gid://shopify/Metaobject/56188960991 - breadcrumbs: ["gid://shopify/Collection/267180835005"] - customhs_code: 903031 - detailed_description: {"type":"root","children":[{"type":"heading","level":2,"children":[{"type":"text","value":"Features*"}]},{"type":"paragraph","children":[{"type":"text","value":" Low stimulus voltages, selectable between approx 380mV or approx 205mV."}]},{"type":"list","listType":"unordered","children":[{"type":"list-item","children":[{"type":"text","value":"Stimulus voltage at the output terminal is limited by the maximum current supply of approx 20mA. "}]},{"type":"list-item","children":[{"type":"text","value":"Accurate readings from >100M to 10 Ohms."}]},{"type":"list-item","children":[{"type":"text","value":"A 128 x 64 LCD display gives a wealth of information about your Resistance readings."}]},{"type":"list-item","children":[{"type":"text","value":"A large display shows MΩ, KΩ, and Ω, all on one line."}]},{"type":"list-item","children":[{"type":"text","value":"Readings every 400mS, built up from 160 samples and averaged to tune out mains noise (both 50 Hz and 60 Hz)."}]},{"type":"list-item","children":[{"type":"text","value":"Fully isolated USB Interface for device control and readings export."}]},{"type":"list-item","children":[{"type":"text","value":"SNR display indicates noise level on signal."}]},{"type":"list-item","children":[{"type":"text","value":"On-screen confirmation of stimulus voltage."}]},{"type":"list-item","children":[{"type":"text","value":"Range Bar movement after every reading shows that ΩhmRanger-LCV™ is operating correctly."}]},{"type":"list-item","children":[{"type":"text","value":"Range Coverage Bar shows the ranges covered during the measurement. "}]},{"type":"list-item","children":[{"type":"text","value":"User-configurable Auto Power-off timer."}]},{"type":"list-item","children":[{"type":"text","value":"ΩhmRanger-LCV™ is highly portable with dimensions of 148 x 90 x 30mm. "}]},{"type":"list-item","children":[{"type":"text","value":"2 x AA batteries should give around 150 hours of operation."}]}]},{"type":"paragraph","children":[{"type":"text","value":" * Features may be subject to change."}]},{"type":"heading","level":2,"children":[{"type":"text","value":"A Real Customer Need - Met"}]},{"type":"paragraph","children":[{"type":"text","value":"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."}]},{"type":"paragraph","children":[{"type":"text","value":"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."}]},{"type":"heading","level":3,"children":[{"type":"text","value":"On completion of test and evaluation, D-Wave commented;"}]},{"type":"paragraph","children":[{"type":"text","value":"\"The AltoNovus ΩhmRanger-LCV turned an error-prone measurement into a simple measurement ..... a valuable addition to our work building quantum computers.\"","italic":true}]},{"type":"paragraph","children":[{"type":"text","value":" \"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.","italic":true}]},{"type":"paragraph","children":[{"type":"text","value":"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.\"","italic":true}]}]} - key_feature_2_tooltip: {"type":"root","children":[{"type":"paragraph","children":[{"type":"text","value":"Applies only 206 mV or 380 mV to the DUT, dramatically reducing risk of forward-biasing junctions or stressing cryogenic devices. Select the limit appropriate to your technology and keep measurement stimulus predictable, repeatable, and within device-specific safe operating boundaries always."}]}]} - key_feature_3_tooltip: {"type":"root","children":[{"type":"paragraph","children":[{"type":"text","value":"Covers 10 Ω to beyond 100 MΩ in a single handheld instrument, eliminating range gaps common in bench DMMs. Confidently measure wiring, thin films, sensors, and device contacts without switching tools, while the display reports measured current and computed resistance."}]}]} - key_feature_4_tooltip: {"type":"root","children":[{"type":"paragraph","children":[{"type":"text","value":"Built-in current limiting to approximately 30 mA helps protect low-impedance devices and fragile junctions during test. Prevent accidental overstress from unexpected shorts or user mistakes, and maintain consistent test conditions when characterising contacts, interconnects, or cryogenic components at low temperatures."}]}]} - key_feature_5_tooltip: {"type":"root","children":[{"type":"paragraph","children":[{"type":"text","value":"SNR readout quantifies noise on each measurement and shows min/max current samples, revealing instability, pickup, or DUT nonlinearity. Use it to optimise fixturing, shielding, and cabling, helping you reach repeatable results faster without separate instrumentation or time-consuming analysis or external software."}]}]} - key_feature_6_tooltip: {"type":"root","children":[{"type":"paragraph","children":[{"type":"text","value":"Fully isolated micro-USB interface allows PC control and data export using standard SCPI commands, avoiding ground loops and measurement corruption. Integrate the meter into automated test scripts safely, preserve instrument portability, and log readings for later analysis without additional adapters."}]}]} - key_feature_7: ~150 Hours On 2×AA With Auto Power-Off - key_feature_7_tooltip: {"type":"root","children":[{"type":"paragraph","children":[{"type":"text","value":"Operates from two AA cells for around one hundred fifty hours, with backlight and auto power-off options to extend life. Keep tests running in the lab or field without frequent charging, and avoid mains-related interference during sensitive resistance measurements entirely."}]}]} - key_feature_8_tooltip: {"type":"root","children":[{"type":"paragraph","children":[{"type":"text","value":"Updates approximately every four hundred milliseconds, averaging one hundred sixty samples to reduce 50/60 Hz hum and random noise. See stable results faster, hear the beep-read indicator, and move through test points efficiently when screening devices or documenting process parameters."}]}]} - key_feature_8: 400 ms Updates With 160-Sample Averaging - why_people_choose_3_title: Faster Stable Readings - why_people_choose_2_title: Automate & Log Safely - why_people_choose_1_title: Protect Delicate Junctions - why_people_choose_1: Protects fragile junctions with selectable 206/380 mV stimulus and ~30 mA current limit, enabling safe resistance tests others cannot perform. - why_people_choose_3: Built-in SNR display and averaged readings accelerate stable measurements and troubleshooting, improving repeatability across devices, fixtures, and environments and teams. - why_people_choose_2: Portable, isolated, and SCPI-controllable for lab automation or field work; logs results without ground loops, mains noise, or extra gear. - 1563478: What does “low compliance voltage” mean on ΩhmRanger-LCV?***SIMP***It limits the maximum voltage applied to the DUT (206 mV or 380 mV), reducing risk of junction damage compared with multimeters that apply several volts. - 1563479: Why use ΩhmRanger-LCV for Josephson junctions or cryogenic devices?***SIMP***Such devices can be damaged by higher stimulus voltages; ΩhmRanger-LCV’s low-stimulus design enables resistance checks without exceeding ~400 mV. - 1563480: What resistance range does it cover?***SIMP***From 10 Ω to greater than 100 MΩ, suitable for contacts, thin films, sensors and wiring. - 1563481: How fast are readings and how is noise handled?***SIMP***Displays update about every 400 ms and average 160 samples to reduce 50/60 Hz mains hum for stable results. - 1563482: What is the SNR readout for?***SIMP***It quantifies noise on the signal and shows minimum/maximum current during a reading, helping diagnose pickup and optimise fixturing and shielding. - 1563483: Can I automate measurements or log data to a PC?***SIMP***Yes. A fully isolated micro-USB port supports SCPI commands for control and data export into scripts or logging tools. - 1563484: How long does the instrument run on batteries?***SIMP***Typical operation exceeds 150 hours on two AA cells, helped by an auto power-off timer and backlight control. - 1563487: Is this a replacement for an SMU (e.g., Keysight B2900, Keithley 2400)?***SIMP***No. SMUs source/measure with flexible sweeps but are larger and costlier. ΩhmRanger-LCV is a focused, portable low-stimulus ohmmeter for safe resistance checks. - 1563488: Does the USB isolation help measurement accuracy?***SIMP***Isolation reduces ground loops and PC-coupled interference that would otherwise corrupt low-level measurements—important when measuring nanoamps across high resistances. - 1563489: Is ΩhmRanger-LCV certified for lab use?***SIMP***Yes. The manual lists UKCA, CE and FCC compliance; operating environment is 0–50 °C, 10–90% RH non-condensing. - summary:The AltoNovus ΩhmRanger-LCV (OR-01) is a handheld, low-compliance-voltage ohmmeter designed to measure resistance safely on sensitive devices such as Josephson junctions, nanowires and MEMS. It applies a selectable maximum stimulus of approx. 206 mV or 380 mV and limits current to ~30 mA to avoid forward-biasing or damaging delicate structures. Readings span 10 Ω to >100 MΩ.
A backlit 128×64 display shows resistance, applied voltage and measured current, plus a Signal-to-Noise Ratio (SNR) indicator with min/max current samples. Readings update about every 400 ms and are built from 160 averaged samples to reduce 50/60 Hz hum. A fully isolated micro-USB port supports SCPI control and data export. Power is via two AA cells for around 150 hours, with auto power-off and adjustable backlight to extend battery life.
Where conventional DMMs may apply 3–10 V across a DUT, ΩhmRanger-LCV’s low-stimulus approach helps protect fragile junctions and cryogenic devices while providing practical, portable measurements. It is a focused alternative to using a benchtop SMU when you need quick, safe resistance checks without complex setup.