BNC 1201 - 6 1/2 Digit Digital Multimeter - Manual (Page 93)

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the test voltage is within the limits in diode testing.
the source signal fails the limit testing.
After the beeper is disabled, the meter still emits a tone when:
an error occurs.
any button on the front panel is pressed.
the threshold value is exceeded in continuity testing.
Default
The beeper is enabled when it is shipped from the factory.
How to control the beeper
User can control the beeper from either the front panel operation or the
remote interface operation.
Front Panel Operation
Follow the procedure below to disable or enable the beeper: Press MENU
button then use ◁ and ▷ buttons to find SYSTEM menu. Press ENTER
to choose it, and then again use ◁ and ▷ buttons to find BEEP menu.
Press ENTER to choose it, and then find ON or OFF by using ◁ and ▷
buttons. Press ENTER on your selection. The locations of the buttons are
shown with red rectangle frames in Figure 4-27.
Procedures: MENU → SYSTEM → BEEP→ {ON|OFF}
Figure 4-27
Remote Interface Operation