Calibration of the TQC Hull Roughness Analyser

To ensure proper measurements it is required to regularly perform a calibration of your gauge.

Note: For best results allow your equipment to adjust to ambient temperature for about ten minutes.

1.1 Hull Roughness Gauge Calibration

Select from menu:

  1. Instrument setup
  2. Calibrate
  3. Calibrate gauge

Position the sensor unit as displayed in the image below:

Positioning of HRG onto the calibration plate

Positioning of HRG onto the calibration plate

 

 

 

 

 

(Move the sensor unit back and forth a bit to assure proper alignment with the calibration plate.)

1.2 Procedure

  1. Click ‘Ok’ to start the procedure.
  2. Align the rear wheel with the ‘0 μm’ on the calibration plate. Press ‘Ok’.*
  3. Align the rear wheel with the ‘500 μm’ on the calibration plate. Press ‘Ok’.*
  4. Align the rear wheel with the ‘1500 μm’ on the calibration plate. Press ‘Ok’.*
  5. Align the rear wheel with the ‘2500 μm’ on the calibration plate. Press ‘Ok’.*
  6. Confirm your new calibration by pressing ‘Synchronize’.

*Note: If your measured values deviate a lot from the reference point values, repeating the complete calibration process multiple times will improve accuracy.

Example:
During step 2 of the calibration procedure the displayed ‘Ref.’ value (0000) and the measured ‘Gauge’ value on the control unit can deviate a lot depending on how well the gauge has been calibrated in the past. If your gauge has never been calibrated the measured value can deviate extremely.

* Whatever the measured value might be, just ignore it and Press ‘Ok’. You are adjusting the gauge now. Literally you tell the gauge: “What you have measured is 0 μm!” The same goes for step 3,4 & 5 of the calibration procedure. Repeating the calibration process once more should lessen the deviation of readings till the point that the measured value is well within the specified accuracy of the gauge. (+/- 5 microns or  <2%, whichever is greater).

Repeating the calibration process will confirm and assure you that the measured values are accurate. From our experience we can tell that a well calibrated gauge often has an accuracy way beyond our given specifications of +/- 5 microns or  <2%, whichever is greater. Many times the gauge is spot on!

Repeating the calibration procedure 2 or 3 times is sufficient.

1.3 Program ref. std. (Please read this chapter carefully.)

This advanced feature should only be used if you have equipment  to exactly measure your calibration plate or possess a calibration plate accompanied with a valid calibration certificate.

(TQC offers calibration services and is able to supply your gauge with a fully traceable calibration certificate for the calibration plate. Since gauge calibrations itself can easily be altered we do not recommend to calibrate the actual gauge.)

NOTE: As of 17-09-2012: We supply each gauge with a fully traceable calibration certificate for the calibration plate as a standard procedure. Usually certificates are renewed each year.

This feature should only be changed if the reference standard deviates from the standard 0000, 0500, 1500 & 2500 micron reference.

Your calibration report might state that the 500 μm reference point actually measures 498 μm. In the ‘program ref. std.’ option you can adjust the gauge for this deviation.

Select:

  1. Instrument setup
  2. Calibrate
  3. Program ref. std.
  • Select [ 0500 ] and click ‘Ok’. ( [ 0500 ] starts to blink)
  • Use Up/Down keys to adjust the value to the value stated in your calibration certificate, 498 μm in our example and press ‘Ok’.
  • The same goes for [ 1500 ] & [ 2500 ]
  • Finally confirm your adjustments to save the made alterations.

Note: If you perform a new calibration of the gauge you will notice that the ‘Ref.’ values have changed according to your made adjustments.