PR series balances provide three calibration methods: internal calibration , span calibration and linearity calibration .
Note: When the balance is calibrated, it is strictly forbidden to touch it and do not disturb it.
5.2.1 Calibration submenu (internal calibration model)
Note: Non-internal models only have span calibration, linearity calibration and calibration test.
5.2.2 Internal calibration (not applicable to external calibration models)
Internal calibration adopts internal calibration code. Please ensure that the balance is sufficiently warmed up and leveled before performing automatic internal calibration. Automatic internal calibration can be performed at any time, provided the balance has been warmed up to operating temperature and the balance has been leveled.
When the balance is switched on and there is no load on the weighing pan, an automatic internal calibration can be performed.
Alternatively, an automatic internal calibration can be initiated by pressing the calibration key on the balance. The display shows the calibration status, and returns to the current application after the calibration is complete.
5.2.3 Automatic calibration adjustment (not applicable to external calibration models)
Using this calibration method allows the zero calibration point to be adjusted without affecting span or linearity calibration.
Calibration Adjustment The internal calibration can be adjusted in ±100 increments.
Note: Performs an automatic internal calibration before performing calibration adjustments. To verify that an adjustment is required, place a test weight equal to the thousand-range calibration value on the pan and record the difference between the test weight value and the actual balance reading (expressed in divisions). If the difference is within ±1 division, no calibration adjustment is required. If the difference exceeds ±1 division value, a calibration adjustment is recommended.
Select Auto Calibration Adjustment in the Calibration menu list, enter the Auto Calibration adjustment value (positive or negative division value), and press Save.
Calibrate again with automatic internal calibration. After calibration, place the test code on the weighing pan to verify that the code value matches the displayed value. If not, repeat the above operations until the values match.
When finished, the balance stores the adjusted value and returns to the current application.
5.2.4 Range Calibration
Span calibration uses two calibration points, one is the zero point and the other is the set span calibration point. For the span calibration points, see 'External Calibration Code' in '9-1 Specification Table'.
When the balance is turned on and there is no load on the weighing pan, enter Span Calibration to start the calibration procedure. The calibration code value to be used is shown on the display.
It is recommended to use a calibration code close to the maximum range value, which can achieve good accuracy.
Span Calibration Procedure
1. Long press the tare l menu-calibration key to display the CAL (calibration) menu.
2. Press Yes to enter the calibration menu.
3. To change the calibration mode, keep pressing the No key until SpaN (span calibration) is displayed. Press Yes to start span calibration.
4. The display shows the calibration code value to be used. For example, the screen displays 200.0000 g, that is, put 200 g weight on the weighing pan. You can press the Function/Weighing Mode key to change the calibration point to half scale (100 g). When the screen displays "Place calibration code 100.0000 g", place 100 grams of calibration code on the pan.
5. The screen displays CA LD one, indicating that the span calibration is complete. Press any key to return to the previous state.
6. Remove the code and reset the reading to zero
