d&b D6 Software - Manual (Page 27)

Power Supply Power Supply
Selecting "Power Supply" and pressing the encoder enters the submenu.
Power Supply
Back
Mains
230V
Frequency 50Hz
Mains
The currently measured mains voltage to which the device is connected
in volts. The typical accuracy is 2 %.
Frequency
The detected mains frequency.
Buzzer off Buzzer
An additional acoustical signal for error messages.
on/off
Turning the buzzer on or off.
D6 Software manual (Firmware V1.x.x) (1.3 EN) Page 27 of 32