B&K Precision 2640 - Manual - Manual (Page 75)

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No. 1 [Start/Stop]
 Press the No. 1 key to input the value of 1.
To input the value of numeral 1 in the Start/Stop/Scan/Center
frequencies, please use the No. 1 Key.
 Pressing No, 1 key and the Shift Key will active the
Input function for Start/Stop Mode.
Select the Start/Stop Mode by pushing the Shift Key and than
push the numeral Key.
[Please refer to the Frequency Input section for a description of basic
operation if more detail is needed.].
No. 2 [Span]
 Press the No. 2 key to input the value of 2.
Input the value of numeral 2 in the Start/Stop/Scan/Center Mode by
pressing the No. 2 Key.
 Span Frequency Input function can be activated by pushing
Shift Key
By pushing the Shift Key and than pushing the No. 2 Key,
the Span Mode can be activated.
[Please refer to the Span section for a detailed description of basic
operation if required.]