B&K Precision 2640 - Manual - Manual (Page 74)

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Sweep [kHz]
 Selecting Sweep Mode
This button selects the Sweep Mode such as FREE Run ,
SQUELCH Run and SINGLE Run
[Please refer to the Sweep Mode section for a detailed description of
basic operation.]
 The units input function can be used to set up Start/ Stop/
Scan/ Center frequencies.
After input the value of frequency, push the key of kHz for the units its.
Marker [DEL]
 Selecting Marker functions.
After pushing this button, please select Marker functions such as Center
Marker, Marker 1, Delta Marker and Squelch Marker.
[Please refer to the Marker section for a description of basic operation
for more detail.]
 This is the Delete function when setting up Start/Stop/Scan/Center
frequencies.
When inputting the frequency values, the Marker Key can be
used as the Delete Key.
This key functions as a backspace key on a PC.