B&K Precision 4017A - Manual - Manual (Page 9)

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CONTROLS AND INDICATORS
17. DUTY CYCLE Switch. When engaged, enables operation
of DUTY CYCLE control (10).
18. SWEEP TIME Control. In sweep mode, rotation
determines amount of time to sweep from the start frequency
to the stop frequency.
19. FINE FREQUENCY Control. Vernier adjustment of the
output frequency for ease of setting frequency.
20. COARSE FREQUENCY Control. Coarse adjustment of
the output frequency from 0.1 to 1 times the selected range.
21. COUNTER DISPLAY. Displays frequency of internally
generated waveform.
22. GATE LED. Indicates when the frequency counter
display is updated. When the 100K through 10M
ranges are selected, the LED will flash 10 times per
second (every 0.1 seconds). When the 10 through 10K
ranges are selected, the LED will flash once every
second and when the 1 range is selected, the LED will
flash every 10 seconds. As the LED turns off, the
display is updated.
23. Hz and KHz LED. Indicates whether the counter is
reading in Hz or kHz.