B&K Precision 2640 - Manual - Manual (Page 79)

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No. 9 [Attenuator]
 Push the No. 9 key to input the value of 9.
To input the value of numeral 9 in the Start/Stop/Scan/Center
frequencies, the No. 9 Key is used
 Attenuator Setup Function after pushing the Shift Key
By pushing the Shift key and then pushing the No. 9 Key,
Attenuator function can be selected.
[Please refer to the Attenuator Setup section for details about basic
operation.]
No. 0 [System]
 Push the No. 0 key to input the value of 0.
When inputting the value of numeral 0 in the Start/Stop/Scan/Center
frequencies, the No. 0 Key is used.
 System Setup Function after pushing the Shift Key
By pushing the Shift key and then pushing the No. 0 Key,
System Setup function can be selected.
[Please refer to the System Setup section for details about basic
operation.]