microHAM SMORF, Manual

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OSCILLOSCOPE SCREEN
Oscilloscope screen is another great feature of the SMΩRF. Serves for waveform inspection, overshoots
visualization, lead and tail time measurements etc etc … It mimics standard digital bench oscilloscope but since
SMΩRF is an instruments for RF power measurements, it is optimized for this job, and adds some features you
will not find on any standard digital oscilloscope.
“We have put a lot of attention to the oscilloscope screen because oscilloscope is the most important instrument in
any electronic lab. Due to high speed requirements, vertical resolution and limited accuracy, RF measurements on
bench oscilloscope is tricky and inaccurate or demands very expensive model. And it is a task where SM
ΩRF
' s
oscilloscope screen brings several advantages. It has no hardware-defined ranges and uses full dynamic range of the
meter. That means it cannot be overloaded and cursors show exact value of amplitude even if they are not visible or
hugely offset. Additionally it provides vertical ranges in Watts and dBm, not only in Volts. Both vertical and horizontal
axes are fully labeled by actual value, not by common value/div style for faster readout. You won't need to count
divisions and multiply by current range, you will immediately see where you are. We hope you will find it useful and
enjoy it.”
CONTROLS:
1. MODE
Sets oscilloscope operating mode:
•
ROLL – Rolling mode
In Rolling mode screen scrolls from the right to left while new data appears on the right side. Speed
of scrolling depends on horizontal timebase (3). Changing horizontal or vertical scale restarts
scrolling. Scrolling waveform can be stopped anytime by moving MODE selection to the next right
STOP position.
Please note, in Rolling mode trigger has no sense and its adjustment is not available.
•
AUTO – Automatic Acquisition mode
Similar to AUTO trigger setting on common oscilloscopes. Screen in the AUTO mode is overwritten
every time input signal causes a trigger condition. If there is no trigger, after a short period the screen
starts to be refreshed continuously. The consequence is, that if the signal disappears, even if there
was a trigger previously, the display is cleared after a short period. It is a general oscilloscope screen
most suitable for periodic signals.
•
NORM – Normal Acquisition mode
NORM mode is in behavior very similar to the AUTO mode, difference is that when signal disappears,
waveform stays on display until new signal, matching the trigger condition arrives.
•
SNGL – Single Shot Acquisition mode
Single shot mode is true memory mode. It captures waveform of the input signal immediately when it
passes the trigger condition. Acquisition than automatically stops and waveform stays on display for
further analysis.
To restart capturing, move the knob from the STOP icon to the right. Icon will show SNGL until after
new waveform is captured again.
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