Firmware
Request a firmware upgrade
We'll bring your box up to the newest firmware. Boxes on any firmware before 7.x can't use the Companion app.
Support
Questions go to real people in Scottsdale.
Contact
- mike@maxmetrix.com
- Phone: talk to Mike
- 602-751-5848
- Address
- 10632 N Scottsdale Rd, B417, Scottsdale, AZ 85254
Calibration
Request a calibration
Send your box in for calibration and a certificate. It comes with a free firmware upgrade.
Manual
Pick the manual for your box. The current manual covers firmware 7.x and later and the ohmSTAR Companion. Boxes on firmware before 6.1 use the original manual.
Manual · firmware 7.x and later
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Warranty and returns
- Warranty
- Lifetime warranty for the original purchaser in the United States. We repair or replace defective parts at no charge and pay labor and return shipping; you pay shipping to us. Email mike@maxmetrix.com for approval before you ship. Not covered: batteries, test leads, routine calibration, repair or changes by anyone else, and misuse such as over-current.
- Calibration
- We recommend calibrating every 2 years. You can calibrate it in the field with a reference ohmmeter 10× more accurate than the box.
- Returns
- 30 days. Just call us at 602-751-5848 and we'll make it right.
FAQ
What is ohmSTAR?
It's a precision programmable resistor, or resistance substitution box. It replaces a decade box, outputting real resistance from 1 Ω to 25 MΩ (ohmSTAR) or 1 Ω to 5 MΩ (ohmSTAR+).
Is the resistance real or electronically emulated?
It's real. Both models are 100% mechanically switched, using latching relays and precision fixed resistors.
What's the difference between ohmSTAR and ohmSTAR+?
Neither is better; they cover different ranges and step sizes. ohmSTAR covers 1 Ω to 25 MΩ in 0.1 Ω steps for $987. ohmSTAR+ covers 1 Ω to 5 MΩ in 0.01 Ω steps for $1,024. Pick the one that fits your bench.
Which sensors can it simulate?
Platinum RTDs, NTC thermistors, strain gauges, conductivity cells, and potentiometric position or level sensors. Anything else works if you can write it as a table.
How do I load a custom sensor table?
Make a two-column table in a spreadsheet and save it as .txt. Send it over USB with the Lookup Table tool, then press TABLE. The display shows your unit on top and ohms below. Or start from one of the verified tables in the Table Library.
Can I control it from a computer?
Yes. The USB link is two-way, so a computer can set values and read them back. See the command reference. The ohmSTAR Companion desktop app is out now for Windows, Mac and Linux.