B&K Precision 2640 - Manual - Manual (Page 78)

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No. 7 [LCD Light]
 Push the No. 7 key to input the value of 7.
When inputting the value of numeral 7 in the Start/Stop/Scan/Center
frequencies, the No. 7 Key is used
 LCD Light Function after pushing the Shift Key
By pushing the Shift key and then pushing the No. 7 Key,
LCD Light function can be selected.
[Please refer to the LCD Light section for details about basic operation
if needed.]
No. 8 [LCD CONT; LCD Contrast]
 Push the No. 8 key to input the value of 8.
To input the value of numeral 8 in the Start/Stop/Scan/Center
frequencies, the No. 8 Key is used.
 LCD Contrast Function after pushing the Shift Key
By pushing the Shift key and then pushing the No. 8 Key,
LCD Contrast function can be selected.
[Please refer to the LCD Contrast section for details on basic
operation.]