Calibration of a DI-100U to a load cell using a Serial Port Terminal Program

Device Setup

  1. If you have purchased LoadVUE, install LoadVUE. This will also install the drivers needed. If you do not have LoadVUE, use the Drivers CD to install the drivers. Alternatively, see Drivers and Serial Port Terminal Programs to download and install the drivers.
  2. You will also need to download and install a serial port terminal program mentioned in the link above.
  3. The DI-100U is powered by the USB and does not need external power.
  4. Connect the USB cable between the computer’s USB port and DI-100U unit. This will add a USB Serial Port entry to the Device Manager.
  5. The default parameters rate is 9600 (or 230400),N,8,1,No hardware flow control. Press Enter in the terminal window and you should get a response ‘A’.

mVolt Calibration

To calibrate a load cell in  pounds  using mVolt/V type the following commands in sequence in the terminal window. Commands are not case sensitive. For example, to calibrate a 250 lb load cell with a 3.02 mVolt/V rating:
UNITS LB
LC 250
CAL m
MVOLT 3.02 (This number will be available from the load cell calibration/specification certificate.)
TARE (this zeros out the load)
WC (this will continuously output the load in lb. Change the load and ensure that the output changes).

To calibrate a load cell in  kg  using mVolt/V type the following commands in sequence in the terminal program. Commands are not case sensitive. For example, to calibrate a 250 kg load cell with a 3.02 mVolt/V rating:

UNITS KG
LC 250
CAL m
MVOLT 3.02 (This number will be available from the load cell calibration/specification certificate.)
TARE (this zeros out the load)
WC (this will continuously output the load in kg. Change the load and ensure that the output changes).

2-Point Calibration

To calibrate a load cell in  pounds  using a known weight type the following commands in sequence. Commands are not case sensitive. For example, to calibrate a 250 lb load cell using a known load of 100 lb, remove all load from load cell and type:
UNITS LB
LC 250
CAL 2
2PCAL 100
Apply Point 1 Load of 0 LB Press C when ready or Q to quit C
Apply Point 2 Load of 100 LB Press C when ready or Q to quit Apply 100 lb, then type C
TARE (this zeros out the load)
WC (this will continuously output the load in lb. Change the load and ensure that the output changes).

To calibrate a load cell in  kg  using a known weight type the following commands in sequence. Commands are not case sensitive. For example, to calibrate a 250 kg load cell using a known load of 100 kg, remove all load from load cell and type:

UNITS KG
LC 250
CAL 2
2PCAL 100
Apply Point 1 Load of 0 KG Press C when ready or Q to quit C
Apply Point 2 Load of 100 KG Press C when ready or Q to quit Apply 100 kg, then type C
TARE (this zeros out the load)
WC (this will continuously output the load in kg. Change the load and ensure that the output changes).

To calibrate a load cell in Newtons, use UNITS N in the procedures above.

Only in some versions of the DI-1000 you can calibrate in one units (say lb) and then read the output in a different units (say Newtons) - i.e the DI-1000U performs the desired unit conversion. We recommend against doing this. Use our LoadVUE software to read the values in a different units if necessary, or, if you are writing your own software, read the values in the calibrated units and perform the unit conversion yourself.