B&K Precision 4005DDS - Manual - Manual (Page 12)

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5.2 Duty Cycle Control
The DUTY CYCLE KEY can be used to alter the symmetry of a square waveform.
Symmetry variation amounts to changing the duty cycle, a ratio of “high” to “low”
time, effectively converting the instrument into a pulse generator.
1. Press the DUTY CYCLE KEY and the display will blink.
2. Use the number keys to input the duty cycle percentage value (between 20% -
80% can be entered).
3. Press the ENTER KEY to execute duty cycle adjustment. The instrument will then
return to the frequency display.
4. If you want to change the duty cycle percentage value while the instrument is
under duty cycle mode, repeat steps 1-3 above.
To turn off duty cycle, press the DUTY CYCLE KEY two times and the duty cycle LED
will turn off.
Note: The duty cycle adjustment mode only functions for a square waveform and at
frequencies below 3 MHz.
5.3 Function Generator Display Messages
The LED display will show 1.000 kHz after power on. If the user inputs a frequency
value, the LED display will blink until the user presses the ENTER KEY to execute it. If
there is an input error, the LED display will show one of the following messages: Err-
02, Err-03, Err-04, or Err-05. The display will hold this error message for about 3
seconds and then return to the previous display.
Error Code Description
Err-02 Input value is too large
Err-03 Input value is too small
Err-04 Over the key waiting time, did not press ENTER KEY
Err-05 Duty cycle frequency is higher than 3 MHz
Table 2 - Error Codes