Calibration warning CAL guard
The sensors for calibration warning CAL guard monitor the status of the measuring tool, even when it is switched off. If the measuring tool is not being supplied with power by a rechargeable battery or non-rechargeable batteries, an internal energy storage system provides continuous monitoring by the sensors for 72 hours.
The sensors are activated when the measuring tool is started up for the first time.
Calibration Warning Triggers
If one of the following events occurs, the calibration warning CAL guard is triggered and the indicator CAL guard (3) lights up red:
- The calibration interval (every 12 months) has expired.
- The measuring tool was stored outside of the storage temperature range.
- The measuring tool was subjected to a strong shock (e.g. impact with the ground after being dropped).
You can refer to the Bosch Levelling Remote App to see which of the three events triggered the calibration warning. Without the app, the cause cannot be identified, as the indicator CAL guard (3) lighting up indicates merely that the levelling accuracy needs to be checked.
Once the warning has been triggered, the indicator CAL guard (3) lights up until the levelling accuracy has been checked and the indicator switched off.
Procedure in the Event of a Calibration Warning Being Triggered
Check the levelling accuracy of the measuring tool see Accuracy Check of the Measuring Tool.
If the maximum deviation has not been exceeded in any of the tests, switch the indicator CAL guard (3) off. To do so, press and hold the receiver mode button (5) and the Bluetooth® button (9) at the same time for at least 3 s. The indicator CAL guard (3) will go out.
Should the measuring tool exceed the maximum deviation during one of the tests, please have it repaired by a Bosch after-sales service.