Calibrating the SW1

Ensure that the SW1 is level prior to calibrating.

Calibration Rod Configurations

To extend or retract the extendable calibration rod, twist the octagonal weight counterclockwise to unlock and clockwise to lock. There are four internal sections to unlock/lock. For greatest accuracy, let the rod hang vertically when locking the rod in the extended position.
Calibration Object #1: The rod is fully-retracted.
Type 2, Configuration 1
Calibration Object #2: The rod is fully-extended to reach a length of 74 cm or 29".
Type 2, Configuration 2

The calibration rod included with early SW1s is a PVC pipe with removable weight. The end of the pipe nearest the label goes against the back wall of the cradle. If the calibration weight has an “UP” indicator, orient it appropriately.
Calibration Object #1: The weight is installed fully onto the end of the rod.
Type 1, Configuration 1
Calibration Object #2: The weight is removed.
Type 1, Configuration 2

Calibrating

To calibrate, measure the calibration rod in both configurations using the Measure button in the associated section on the Calibrate page. Then, tap the Calibrate button. The calibration result below the button will update. If the calibration results are abnormal, the value(s) will be highlighted in red. Follow the suggestions below the results and try calibrating again.

Tip: Only one measurement of each object is required, but I recommend at least two of each.

Tip: For the extendable calibration rod, measure the extended rod (Calibration Object #2) first. You can more easily switch from the extended to the retracted configuration without removing it from the SW1.

To take a calibration measurement:

  1. Mount the calibration rod in the cradle of the SW1.
    Rod Against Rear\
  2. Navigate to the Calibrate page.
    Navigate to Calibrate
  3. Place the phone in the cradle. Ensure that it is upright, fully seated, and secure.
    Install Phone
  4. Press and hold the cradle against the spring stop that has an indicating arrow.
    Load Cradle Load Cradle Close
  5. Tap the Measure button in the appropriate section.
    Measure Button
  6. Release the cradle to record a measurement.
  7. When Stop appears in the button, stop the cradle.
    Recording Button
    Stop Button
    Wait Button

Validating

  1. Navigate to the Measure page.
    Navigate To Measure
  2. Take a measurement of the “heavier” calibration object and verify that the measurement result matches the label on the rod to within 1.0 kg·cm². If the discrepancy is larger than 1.0 kg·cm², review the Measurement Accuracy page and try calibrating again.

Calibration is Complete

You’re now ready to measure.

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