Operator’s Manual Simple AFG Application
62
•
Logarithm:
the frequency increases and decreases following a logarithmic function.
•
Upstair:
the frequency varies step by step. The number of steps is selectable through the
Step
Number
parameter.
•
Arbitrary:
allows to load a sweep profile from a file.
By default, the “Arbitrary” waveform is a
cosine function. As Carrier Arbitrary you can select the waveform by combo box Waveform List.
•
Note:
the time to execute the sweep is the sum of Rising, Holding and Falling Time. When the
User Defined mode is selected these 3 parameters are not meaningful.
Parameters
•
Rising Time [s]:
it controls the time to increase the frequency from the Start Frequency up to
the Stop Frequency.
•
Holding Time [s]:
it is the time that the frequency keeps the Stop Frequency.
•
Falling Time [s]:
it controls the time to decrease the frequency from the Stop Frequency back to
the Start Frequency.
Note:
the time parameters must meet the following conditions:
𝑅𝑖𝑠𝑖𝑛𝑔 𝑇𝑖𝑚𝑒 + 𝐻𝑜𝑙𝑑𝑖𝑛𝑔 𝑇𝑖𝑚𝑒 + 𝐹𝑎𝑙𝑙𝑖𝑛𝑔 𝑇𝑖𝑚𝑒 ≤ 2000 𝑠
•
Step Number [N]:
it selects the number of frequency steps of the Upstair Sweep mode.
•
Start Frequency [Hz]:
it selects the initial sweep frequency.
•
Stop Frequency [Hz]:
it selects the final sweep frequency.
Sweep Trigger Mode
•
Repeat:
the instrument starts when the Run/Stop button is pressed and repeats the sweep
continuously.
The maximum marker’s skew is about 14s.
•
Trigger:
When the Run/Stop button is pressed the instrument waits for a Trigger signal. When
the trigger is detected, it generates the sweep profile then stops waiting for a new Trigger.
During the wait for a Trigger the instrument generates the waveform with its frequency equal to
the start frequency.
The maximum marker’s skew is about 3us
Marker Out behaviour in Sweep Run Mode
In this Run Mode the
Marker Out
generates a square wave with the rising edge placed at the beginning
of each sweep
and the marker’s period is equal to the sum of Ris
ing Time, Holding Time and Returning
Time parameters.
