Set The Horizontal System; Horizontal Control Knob - Tenma 72-2650 Operating Manual

72-2650/72-10510/72-8225A /72-8705A/72-8710A user manual
Select to load a pre-saved waveform
DSO
from the internal memory of the DSO
Select to load a pre-saved waveform
Disk (F2)
from the external USB device
USB
(selection can only be available after
inserting USB)
Turn off reference waveform
OFF (F3)
Press to load a pre-saved waveform
Load (F4)
Assuming that the user has already stored a waveform
into DSO internal memory location 3. To load this
waveform back to RefA, the user should do the
following at the Load function menu.
Select the memory location 3 by using the multi-purpose
knob.
Press F4
A loading progress bar will be shown on the screen.
If loading successfully, a white waveform should be
displayed on the screen label with RefA.
If there is no waveform stored at the selected memory
location, you will see a system message showing "no
data in the position".
The user can turn off the RefA reference waveform by
pressing the OFF F3 button on the load function menu.
Attention:
Loading the pre-saved waveform into RefB follows
the same procedure as above.
If waveform is stored to the USB device, there should
be 200 available memory locations to be selected. Please
see the "Storage and Load" sec tion for how to save a
waveform to the USB device.

2.2 Set The Horizontal System

Horizontal control knob

Using the horizontal control knob can change the
horizontal scale (time base) and trigger horizontal
position (trigger position) in internal storage. The vertical
midpoint in screen horizontal direction is the time reference
point of waveform. Changing of the horizontal scale can lead
21