Ceyear 4051 Series, User Manual

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4. Operating Instruction
4.1 Function operation guide
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Fig. 4.2 Setting Interface of Video Trigger
Prompt
Applicable conditions of video trigger
Usually, the video trigger is applied to the time domain power measurement under zero span, while, under
non-zero span (span > 0 Hz), the correct spectrum measurement may not be executed if the video trigger is
set, then the burst signal trigger mode will be used instead of video trigger.
2) Execute external trigger measurement
The trigger input signal corresponding to the external trigger is the trigger input on the front panel (external
trigger 1) or the trigger input on the rear panel (trigger input 2). The trigger input port on the front and rear
panel is BNC. The input port can receive the signal provided by the external device with level ranging from -5
V - +5 V. The trigger input signal can be sine AC signal or TTL level signal. When the sine AC signal is input,
the comparator circuit inside the Series Signal Analyzer will compare with the trigger level set and then
convert it into TTL level signal.
The external trigger level can be set in such steps of pressing the 【 Trig 】 key on the front panel, entering
[External 1 ▶ ] or [External 2 ▶ ], pressing soft menu of [Trigger Level] and then using the number keys,
Up/Down key or knob. If the External Trigger 1 is activated, the Series Signal Analyzer will automatically
select the trigger input signal on the front panel; if the External Trigger 2 is activated, the Series Signal
Analyzer will automatically select the trigger input signal on the rear panel.
Prompt
In the state of external trigger measurement, please carefully inspect whether the analyzer is properly
connected with the external device or not and ensure that the correct external trigger input signal is provided if
the Series Signal Analyzer cannot execute the measurement properly.