Filter
Top Products
Example 2: Multiple Waveforms
TDS 620A, 640A & 644A User Manual
1Ć15
3. Press AUTOSET.
4. Press CH 2.
The display shows a second waveform, which represents the signal on
channel 2. Since there is nothing connected to the CH 2 input connecĆ
tor, this waveform is a flat line.
There are several other important things to observe:
H The channel readout on the display now shows the settings for both
Ch1 and Ch2.
H There are two channel indicators at the left edge of the graticule.
Right now, they overlap.
H The light next to the CH 2 button is now on, and the CH 1 light is off.
Because the knobs control only one channel at a time, the vertical
controls are now set to adjust channel 2.
H The trigger readout still indicates that the trigger is detecting trigger
events on Ch1. The trigger source is not changed simply by adding
a channel. (You can change the trigger source by using the TRIGĆ
GER MENU button to display the trigger menu.)
5. Turn the vertical POSITION knob clockwise to move the channelĂ2
waveform up on the graticule. You will notice that the channel reference
indicator for channelĂ2 moves with the waveform.
6. Press VERTICAL MENU ➞ Coupling (main).
The VERTICAL MENU button displays a menu that gives you control
over many vertical channel parameters (Figure 1Ć14). Although there can
be more than one channel displayed, the vertical menu and buttons only
adjust the selected channel.
Each menu item in the Vertical menu displays a side menu. Right now,
the Coupling item in the main menu is highlighted, which means that
the side menu shows the coupling choices. At the top of the side menu,
the menu title shows the channel affected by the menu choices. That
always matches the lighted channel button.
7. Press W (side) to toggle the selection to 50 W. That changes the input
coupling of channel 2 from 1 MW to 50 W. The channel readout for
channel 2 (near the bottom of the graticule) now shows an W indicator.