13
Note A
•
Use Real time sampling to observe single signals.
•
Use Equivalent sampling to observe high frequency cyclical signals.
•
To avoid mixed envelop, select Peak Detect.
•
To reduce random noise of the displayed signal, select average sampling and
increase the average number of times in multiples of 2, i.e selecting from 2 to 256.
Definitions :
1. Normal sampling mode
: The digital storage oscilloscope acquires signal sample
at equal and regular intervals to reconstruct the waveform.
2. Peak detect mode
: In this acquisition mode, the digital storage oscilloscope
identifies the biggest and smallest values of the input signals at each sampling
interval and uses these values to display the waveform. In effect, it can acquire
and display narrow pulse which would otherwise be omitted in the sampling mode.
Noise seems to be more significant in this mode.
3. Average mode
: The digital storage oscilloscope acquires several waveforms and
takes the average value to display the final waveform. You can use this mode to
reduce random noise.
Note B
Definitions
:
1. Display Type
: Vector display fills the space between adjacent sample points in the
display. Dot display shows only the sampling points.
2. Refresh rate
: Refresh rate is the number of times the digital storage oscilloscope
refreshes the waveform display per second. The refreshing speed affects the
capability to observe signal movements speedily.
3. X-Y Mode
This mode can be activated only when Channel A and Channel B are both on. After
selecting the X-Y display mode, the horizontal axis will display the A signal, while
the vertical axis will display the B signal.
Caution:
In the normal X-Y mode, you can adjust waveform amplitude with VOLTS/
DIV of the two channels. Adjusting the s/DIV time base will result in a lissajous figure of
better display quality. The following functions are disabled in the X-Y display mode:
•
Automatic measurement mode
•
Cursor measurement mode
•
Reference or function waveform
•
Vector display type
•
Trigger control
4. Y-T Mode
: In this mode the Y axis indicates voltage and the X axis indicates time.
5. X-Y Mode
: In this mode the X axis indicates Channel A voltage and the Y axis
indicates Channel B voltage.
6. Slow Scanning Mode
: When horizontal time base control is set at 50ms/div or
slower, the unit will operate in the slow scan sampling mode. When observing low
frequency signals in slow scanning mode, it is advised to set channel coupling to
DC.
7. S/ns
: A horizontal scaling (time base) unit. If waveform sampling is stopped (by
pressing the [RUN/STOP] button), time base control can expand or compress the
waveform.
