B&K Precision 2640 - Manual - Manual (Page 76)

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No. 3 [Level]
 Push the No. 3 key to input the value of 3.
In order to input the value of numeral 3 in the Start/Stop/Scan/Center
frequencies, push the No. 3 Key.
 Display Level Adjustment Function by pushing Shift
Key.
On pushing the Shift Key and then push the No. 3 Key,
Basic Level of vertical axis and Level Step on display could be adjusted.
[Please refer to the Display Level Adjustment section for a detailed
description of basic operation if need.]
No. 4 [SINGLE]
 Push the No. 4 key to input the value of 4.
In order to input the value of numeral 4 in the Start/Stop/Scan/Center
frequencies, push the No. 4 Key.
 Single Power Meter Adjustment Function by pushing Shift
Key
After pushing the Shift key on, if No. 4 key is pushed,
Single Power Meter function will be selected.
[Please refer to the section for Single Power Meter using the Power
Meter for detailed description of basic operation if needed.]