Ceyear 4051 Series, User Manual

Page: 154 / 751

4. Operating Instruction
4.2 Advanced operation guide
140
Step 4. Opened the Gate Preview Window, and set the gate delay and gate width, etc.:

Press 【 Sweep 】 , [Gate], [Gate Setup], [Gate Method] and [LO];

Press [Gate Delay] and input 2ms;

Press [Gate
Length
] and enter 1ms;

Press [Gate View Sweep Time] and input 5ms;

Press [Gate Source] and select [External Signal 1], [Trigger Level] 1.2V and [Pos] for [Gate
Slope
].
 Press [Gate View On Off] and select [On].
The interface of Gate Preview Window is shown in Fig. 4.58, stating the temporal relations of the gate trigger,
gate delay, width and the measured signal pulse envelope. The time on the left of the figure is the Zero Hour,
indicating the time when the gate trigger event occurs, which also refer to the initial time of the Gate On when
the gate delay is zero. The green line on the left represents the initial time of Gate On, as well as the gate delay
time. The time between the two green lines refers to the gate width, namely the gating time. The yellow path
line represents the temporal envelope of the input RF pulse signal.
Adjust the gate delay time to make the gating time between 20% and 80% of the pulse envelope. If there are
changes in the measuring conditions, such as the resolution bandwidth and bandwidth, etc., the Gate Preview
should be reopened to reset the gate trigger polarity, gate delay and gate width, etc.
Fig. 4.58 Gate Preview Interface of LO Status