Define the minimum frequency of the waveform currently selected as
F
min, the maximum
frequency as
F
max and
Fm = (F
min
+F
max)
/
2.
The range of center frequency is from
F
min to
F
max.For frequency parameters of different
waveforms, please refer to "Frequency Characteristics" in "
".
The range of the frequency span is influenced by the center frequency:
Center frequency <
F
m: frequency span range is ±2 × (center frequency -
F
min);
Center
frequency ≥
F
m: frequency span range is ±2 × (
F
max- center frequency).
Take sine as an example.
F
min is 1μHz,
F
max is 160MHz and
F
m is about 80MHz.
If the center frequency is 550Hz, the range of the frequency span is:
±2 × (550Hz –
1μHz) = ±1.099999998kHz;
if the center frequency is 155MHz, the range of the frequency span range is:
±2 × (160MHz – 155MHz) = ±10MHz.
After modifying the frequency, the generator will restart to output the frequency sweep signal with
the specified frequency.
Note:
In large-scale sweep, the amplitude characteristic of the output signal might change.
6.4 Linear Sweep
HDG3000B(C) provides linear sweep type.
The output frequency of the instrument varies linearly in the way of "several Hertz per second".
The variation is controlled by "Start Frequency", "Stop Frequency" and "Sweep Time".
6.5 Sweep Time
Sweep time specifies the time required to sweep from the start frequency to the stop frequency.
When
[Sweep]
is enabled,press
Sweep Time
softkeyand use the numeric keyboard or knob to
change the sweep time.
The default value is 1s and the settable range is from 1ms to 50Ks.
6.6 Return Time
Return time specifies the number of seconds to return from the stop frequency to the start
frequency.
When
[Sweep]
is enabled, press the
Return Time
softkeyand use the numeric keyboard or knob
to change the return time.
The default value is 1s and the settable range is from 1ms to 50Ks.
User Manual 57
