13
Figure 4
Changing the parameters
Frequency, Level
See description from function generator. The same rules are applied for the pulse
generator too. Level field displays the CMOS level of the pulse generator signal.
The value with no load is displayed.
Duty cycle
The duty knob changes the duty cycle of the output signal between 10% and
90%, minimum step being 1%. The arrow keys can be used to change the digit
selection when the Duty cycle field is active. If the cursor is moved outside of the
Duty cycle field limits, the Frequency or the Level fields will become active.
Enabling the output signal
Pressing CMOS button enables/disables the CMOS signal. In order to
enable/disable the TTL output, the TTL button must be pressed. The
corresponding LED is turned on. CMOS and TTL states are displayed on the
screen. See
Figure 4.
6.3 Frequency counter
Front-panel controls
Figure 5
shows the Frequency Counter controls on the front panel of the trainer.