CANNON Instrument Company | Calibration
Note: TOL(erance) values may vary depending on the reference method for
your laboratory. AASHTO T-313 specifies ± 0.005 mm for deflection and ± 5 mN
for force.
If the TE-BBR is not performing within the specifications prescribed by your
method, repeat the calibration. If verification problems persist, contact your
CANNON representative.
Erratic Readings Error Message
The error message Erratic readings have been received indicates that new calibration
measurements differ significantly from previous results.
1. Verify correct calibration setup: Zero pressure, amount of weight, and position of block. If
incorrect, adjust and run calibration again.
2. If setup is correct, click the ignore button and continue. Calibration results must be within .14
mN/bit to .16 mN/bit for force, and .14 um/bit to .16 um/bit for the deflection with .15 mN
being optimal. If results exceed these ranges, contact CANNON service department for help with
further diagnosis.
Calibrate with the Auto-Thickness Option
The BBRw software automatically measures the thickness of the specimen if the Auto-Thickness
option box in the Test Setup dialog is checked. When entering preliminary data for the test, click on
the option box to select or deselect this option.
Follow the procedure in this section to calibrate the BBR instrument to use the Auto-Thickness
option.
1. Check the Beam Dimensions property sheet in the Instrument Setup dialog to make certain
that the correct value has been entered for Thick Beam Thickness.
2. Select Calibrate from the main menu, then Auto-Thickness Datum from the Calibrate options.
3. Follow the screen prompts to complete the Auto-Thickness calibration procedure. The BBRw
software uses the input values and LVDT readings to generate necessary calibration data for
determination of specimen thickness during BBR testing.
Note: Is it necessary to calbrate the Auto-Thickness each time an LVDT/Load Cell
calibration is performed.
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