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# Dostmann P790
Dostmann P790 meter can be equipped with 2 reference sensors.
The complete handling of the Dostmann P790 instrument is described in its Operating Instruction.
During the calibration with P790 the following manual operations are needed:
* start logging before the calibration,
* enable P790 Bluetooth interface before assigning the meter and reading the measurements,
* disable P790 Bluetooth interface after assigning the meter,
* disable Auto OFF.
All the operations are described below in detail.
**Start logging**
To start logging the measurements in P790 internal memory:
Press (ENTER/MENUE) and use the up and down keys (
) to select **Lo6**. Push (ENTER/MENUE) to confirm.
Use the up or down keys () to select **on**. Push (ENTER/MENUE) to confirm.
Use the up or down keys () to select automatic storage (Auto). Push (ENTER/MENUE) to confirm.
Use the up or down keys (
) to select to create a new file (**nLo6**). Push (ENTER/MENUE) to confirm.
Use the up or down keys (
) to select the time interval of 1 minute (**1 Π**). Push (ENTER/MENUE) to confirm. Push (ESC) to revert to the measuring mode i.e., the state where the readings are shown on the LCD.
The logging stops when the log is read for the first time, but it remains intact and can be read multiple times if needed. The data are deleted only if a new log is started.
**Enable Bluetooth interface**
To enable Bluetooth interface press (ENTER/MENUE). Use the up or down keys (
) to select **bLE**.
Press (ENTER/MENUE) to choose. Use the up or down keys (
) to select **on** and press (ENTER/ MENUE) to confirm.
Push (ESC) to revert back to the measuring mode i.e. the state where the readings are shown on the LCD.
**Please note that there will be no correct communication with the instrument if it will not be in the measuring mode despite the fact it will be discoverable over Bluetooth.**
The BLE on state is indicated by an arrow pointing up, shown in the upper right corner of the meter LCD.
When operating on battery, Bluetooth interface shall be enabled just before reading the reference sensor data because it consumes a lot of power. The meter switches Bluetooth off automatically, after the data are read, to preserve the battery so it has to be enabled if the data has to be read again.
**Disable Bluetooth interface**
To disable Bluetooth interface press (ENTER/MENUE). Use the up or down keys (
) to select **bLE**.
Press (ENTER/MENUE) to choose. Use the up or down keys (
) to select **off** and press (ENTER/ MENUE) to confirm.
Push (ESC) to revert back to the measuring mode i.e. the state where the readings are shown on the LCD.
If BLE is off, then there is no arrow in the upper right corner of the meter LCD.
**Disable AUTO-OFF**
When operating on battery disable AUTO\_OFF function which turns the meter off after 30 minutes. Press and hold (ESC/AUTO-OFF) key to select **dAoF** (Disable AUTO\_OFF) on the LCD. Please note that the default setting after power on is **EAoF** (Enable AUTO\_OFF) so **dAoF** (Disable AUTO\_OFF) must be set every time the instrument is switched on.
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