B&K Precision 2658A - Manual - Manual (Page 14)

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3. Explanation of Panel
1) TFT display
This is a large liquid crystal display with 640 (H) x 480 (V) dots. It simultaneously displays spectrum (10div x
10 div), various setting parameters and measured values.
2) Function key (F1 to F6)
The function can change according to the operation key.
3) Center frequency key