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Bias
•
When the amplitude of the DC component in the signal is relatively large, waveform
observation could be very inconvenient.
•
Using the bias function and the superposition of a -10V bias voltage can eliminate
the DC component of the waveform so the AC signal can be clearly observed.
Setting up the Trigger system
•
Triggering decides when the oscilloscope collects data and displays waveforms.
Once the trigger is correctly set up, it can convert unstable display into significant
waveforms.
•
When beginning to collect data the oscilloscope first collects sufficient data to draw
a waveform on the left of the triggering point.
•
While waiting for the triggering condition to occur it will continuously collect data.
When sufficient data is acquired to draw a waveform on the right of the triggering
point.
Trigger Source - Trigger can be obtained from various sources: Input channel (CH1,
CH2, CH3 or CH4), external trigger (EXT, EXT/5) or Line A/C etc.
1.
Input channel - the most common trigger source is input channel. The selected
trigger source can operate normally whether the input is displayed or not. Select
any one of the analogue signal input terminal CH1~CH4 on the front panel of the
oscilloscope as a trigger signal.
2.
External trigger - Select the input Trig EXT from the back of the oscilloscope. For
example, the external clock input can be used on the Trig EXT terminal as a trigger
source. EXT signal trigger level ranges from -1.8V~ +1.8V can be set. The EXT/5
trigger signal divides the actual signal by 5, so the trigger level can be increased to
-9V ~ +9V.
3.
AC Line - Power supply signal, used to observe the relationship between power
signals such as lighting equipment and power supply equipment, to obtain stability
in synchronization.
Trigger Mode - determines the action of the oscilloscope when there is no trigger. There
are three trigger modes - auto, normal and single.
1.
Auto Trigger - samples the waveform data when there is no trigger signal input.
The scan base is shown on the display. When the trigger signal is generated it
automatically turns to trigger scan for signal synchronisation.
Note: when the time base of the scan waveform is set to 50ms/div or slower, the auto
mode allows no trigger signal.
10
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