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CS_LVTech's picture

After set-up, can a T7 Pro work as a stand alone through WiFi? (no USB)  Can the T7 Pro be powered by connecting 5V to a VS pin with no USB connected?

labjack support's picture

Yes you can use WiFi as only communication pipe, but I would not call that standalone operation.  That would be host-based operation where the connection to the host can be USB, Ethernet or WiFi.  All 3 communication pipes have the same ability (although WiFi is generally slower than USB or Ethernet).  If you are actually asking about standalone operation, where the T7 does things on its own with no commands from a host that is possible through Lua scripting:




There are various options for powering the T7.  See the "Power Supply" section here:


Powering the T7 by connecting 5 volts to VS and GND screw terminals is not recommended as you are bypassing the proper power input path.  More details in the OEM section.


Charles.Locascio@stemco.com's picture

How would I connect the 24vdc to the T7 Pro to control a pneumatic valve?

labjack support's picture

What is the max current your valve will draw?

Likely options are:


labjack support's picture

Chuck says 2 amps, which reduces the options above to the last 2 bullets.  RB12 or standalone relay.

Natalie Herrmann's picture

Has anyone tried to connect an externally powered temperature and RH probe to a LabJack device? I have gotten it to read a voltage, but it is stuck at a constant 0.00234 volts. Has anybody else experienced this issue or have suggestions to resolve this?

labjack support's picture

Do you have the HMT120?


That gives a current signal (standard 4-20 mA).  See the current measurement app note:



omuwaaudu's picture

Good day,

I am a PhD student intending to carry out electrochemical studies using microbial fuel cell (double chambered - anode and cathode compartment) with the anode chamber containing substrates to be used for electron generation. I just recently acquired the LabJack U3-HV to be used as data acquisition, and has gone through the tutorial but am still not fully clear on how to properly connect it to the anode and cathode electrode of my system. Am currently using a jumper wire with alligator clips to connect the GND to the cathode electrode and one of the analog or flexible I/O of the same unit to the anode electrode.  

Please, I would like to know if am using it accurately.

Thank you.

labjack support's picture

The U3 requires signal conditioning to be able to read PH probes. PH probes are very sensitive to bias currents and they produce very small signals. A good amplification circuit is necessary. Here is a discussion about conditioning PH probe signals: https://forums.labjack.com/index.php?showtopic=4698