BNC 645 - Manual (Page 78)

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5.4 Beeper
Model 645 normally lets out a beeper when an error is detected. One may
turn off the beep when needed. The beeper setting is stored in
non-volatile memory, so the setting remains even after the waveform
generator is turned off or the reset command is issued from the remote
operation.
How to turn on/off the beeper
1. Press the Utility button and then press the softkey under System
to enter system related submenu.
2. Press the Beep softkey to toggle between ON and OFF.
Remote interface operation
SYSTem:BEEPer
SYSTem:BEEPer:STATe {OFF|ON}
5.5 Sound
Model 645 normally sounds when the operation buttons and knob are
used. One may turn off the sound when needed. The sound setting is
stored in non-volatile memory, so the setting remains even after the
waveform generator is turned off or the reset command is issued from
the remote operation.
How to turn on/off the beeper
1. Press the Utility button and then press the softkey under System
to enter system related submenu.
2. Press the Sound softkey to toggle between ON and OFF.
Remote interface operation
SYSTem:SOUNd
SYSTem:SOUNd:STATe {OFF|ON}