T7 Quickstart Tutorial | LabJack
 
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T7 Quickstart Tutorial

T7 Quickstart Overview

1. Install the appropriate LabJack driver and software bundle.

The installer covers UD devices (U3, U6, UE9) and LJM devices (T-series, Digit), so not all installed applications will work with the T7. The following applications work with the T7:

  • Kipling,
  • LJLogM, and
  • LJStreamM.

Only run 1 application at a time.

If there is an installation problem, see the Windows Installer Troubleshooting (App Note)

2. Connect the T7 to the computer or hub via USB.
The status LED should blink at power up and then stay solid on to indicate successful enumeration. If Windows asks about installing new hardware accept the defaults. If the device does not enumerate see item F on the USB Communication Failure App Note.
3. Run Kipling.
Kipling is a free application installed along with the driver. You should be able to find it in the Start Menu links.
4. Click "Refresh Devices" if the desired connection is not listed.
5. Click the connection (e.g. "USB").
6. Navigate to the Dashboard.

7. Connect a jumper wire securely from DAC0 to AIN0.

For a guaranteed valid connection, a conductor must be clamped securely in the screw-terminal, not just touching some part of the screw-terminal.

DAC stands for "Digital to Analog Converter", AIN stands for "Analog Input".

8. While still in the Dashboard, read the voltage level of AIN0.

Adjust the DAC0 analog output voltage, and you will see AIN0 follow DAC0 if the jumper wire is installed.

9. Connect one end of the jumper wire to GND, touching the other end inside the FIO3 terminal.
GND stands for Ground. Try connecting and disconnecting the FIO3 end of the jumper wire.
10. The Dashboard will read the current state of the digital input.
Digital inputs have an internal weak pull-up resistor that holds them high when nothing is connected. When the GND wire is connected to FIO3, the digital input will change from logic level High to logic level Low.

 

Moving forward from here...

Basic Functionality Examples:

Connecting via Ethernet or WiFi:

Software Options:

Communication:

On-board Lua Scripting:

Getting Support:

Subsections

54 comments

Ranger_DeVill's picture

Thank you for a fast reply, I had a different question, regarding inputs. Especially digital inputs (for digital, frequency and counters). What is the maximum voltage, that could be applied to a digital input without a risk of damaging it? I've read somewhere that it's 3,3V. Is that correct?

Cheers.

LabJack Support's picture

Digital IO specifications are in appendix A-2: https://labjack.com/support/datasheets/t7/appendix-a-2

FIO lines have a little more protection so they can handle ±10 V. All other digital lines are limited to ±6 V.

A series resistor can be used to read larger signals. That resistor combined with the internal resistance and protection diodes creates a voltage divider that keeps the IO safe.

TARUN SHARMA's picture

Hello Labjack,

Can i use U3-HV to measure 10 Strain Gauge of 3/350ohm, Load Cell and a LVDT readings. Sampling rate is 500 samples per second per channel.

If yes then please guide me to select hardware which will meets my test requirements. 

Also suggest is there any calibration instrument available to check the autheticity of test data.

LabJack Support's picture

To measure 11 bridge circuits (strain gauges and load cells) with the U3-HV you would need 5 LJTick-InAmps and a CB15:

https://labjack.com/support/app-notes/bridge-circuits

https://labjack.com/support/datasheets/accessories/ljtick-inamp/appendix-d

For the LVDT, you want a DC-DC LVDT.  An LVDT with AC input and/or output will be very difficult if not impossible to use.

Often we would suggest the U6/T7 families over the U3 for bridge circuits, as they can measure bridge circuits directly, but not at the 12*500 = 6000 samples/second that you require.

As for calibration, that is very unique to each individual's system.  A common (and usually the best) way of calibrating is to provide some known conditions and note the voltage readings from the LabJack.  For example, put a known load of 0 pounds and 100 pounds on your load cell and note the voltages for those known loads, so you then know the relationship between pounds and volts.

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