B&K Precision 2640 - Manual - Manual (Page 80)

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Shift
 Using the Function Key
The Shift Key dose not performs any function by itself.
The Shift Key can be used with functions printed below the numeral
keys.
If the shift key is pressed twice, CENT/SPAN located on bottom of
display is changed to START/STOP.
Dot [Buzzer]
 The Dot key should be used to input a decimal point
When input the value of Decimal Point in the Start/Stop/Scan/Center
frequencies, this key is used.
 Buzzer Setup Function after pushing the Shift Key
By pushing the Shift key and then pushing the Dot Key,
Buzzer On or OFF can be selected.
[Please refer to the Buzzer section for details on basic operation.]
 Return Function on Menu and System
Return Function is used to return from lower Menu to higher Menu on
Menu and System.