12
Attention:
The square wave has the true meaning of duty cycle. By turning the DUTY CYCLE knob, the symmetry of the waveform
will change for the sine wave and triangle wave. For sine wave, a distorted wave shape will be obtained and for the
triangle wave, a ramp wave will be obtained.
The
DUTY CYCLE LED
lights when output signal is asymmetric.
See section 3.2.5.5 for waveform examples.
3.2.1.7. Selecting output TTL/CMOS level.
The
TTL/CMOS
signal level can be changed using the
TTL/CMOS
button and
CMOS LEVEL
knob.
If CMOS output style is enabled, the output level can be set b 4.0V and +14.0V, unloaded.
See section 3.1.5 for details regarding setting of the CMOS level (see also examples 1 and 2 on section 3.2.1.8).
3.2.2. INTERNAL SWEEP
This mode is used for outputting a signal on the
OUTPUT
jack that sweeps a frequency range. The output frequency does not depend
on any value applied on the input jack,
VCG SWEEP/COUNTER IN
.
3.2.2.1. Selecting INTERNAL SWEEP mode.
INT LED
lighting indicates active
INTERNAL SWEEP
mode.
There are 2 modes of selecting
INTERNAL SWEEP
mode using the front panel buttons depending on the current working mode and
the current value of
SWEEP INT/EXT
button.
In
EXTERNAL VCG
mode (
EXT LED
lights), pressing the
SWEEP INT/EXT
button will engage the
INTERNAL SWEEP
mode.
By engaging this mode, the
INT LED
lights and
EXT LED
stops lighting.
In
FREQCOUNTER
mode (
COUNTER LED
lights), pressing
COUNTER/VCG SWEEP
button will engage the mode selected by
SWEEP INT/EXT
button. If the button activates
EXTERNAL VCG
, the case is the same as described in the previous paragraph,
otherwise the button will activate the
INTERNAL SWEEP
mode.
3.2.2.2. Selecting output waveform.
Pressing one of the “
WAVEFORM
” buttons
: SINE WAVE, SELECT, SQUARE WAVE SELECT or TRIANGLE WAVE
SELECT
, will engage one of the desired waveform: sine, square or triangle respectively. The current selected type of waveform will
have their corresponding LED lighted.
The shape of the waveform can be changed by modifying the duty cycle parameter (see section 3.2.5.4, where there are displayed
waveforms for different duty cycle parameters).
3.2.2.3. Selecting the frequency.
The sweep start frequency can be set directly on the
OUTPUT
jack using the range buttons and the
FREQUENCY
knob. Sweep start
frequency can be set between 0.00Hz and 10.000MHz (see section 3.1.1 for details regarding the setting of the frequency value).
The sweep stop frequency cannot be set directly. The
SWEEP WIDTH
knob must be turned in order to modify the sweep stop
frequency (see sections 3.1.7 and 3.2.1.9 for details).
Modifying any sweep parameter will restart the sweep with the new loaded parameters from the start frequency. Turning the
FREQUENCY
knob will always display the sweep start frequency on LCD display (see section 3.2.5.2 for example of setting sweep
start frequency).
