To adjust the horizontal delay (position)
Horizontal position, also called trigger position, refers to the trigger point position of the waveforms of all channelsin the horizontal direction relative to the screen center. When the waveform trigger point is at the left (right) side of the screen center, the horizontal position is a positive (negative) value. While you change the horizontal position, the waveformtrigger points (solid inverted triangle) and the displayed waveforms of all channels are moved left and right.
Turn the horizontal delay (position) knob ().
The trigger point moves horizontally, pausing at 0.00 s (mimicking a mechanical detent), and the delay value is displayed in the status line.
All events displayed left of the trigger point happened before the trigger occurred. These events are called pre-trigger information, and they show events that led up to the trigger point.Everything to the right of the trigger point is called post-trigger information. The amount of delay range (pre-trigger and post-trigger information) available depends on the time/div selected and memory depth. The horizontal position knob works (in the Normal time mode) while acquisitions are running or when they are stopped. When running, adjusting the horizontal scale knob changes the sample rate. When stopped, adjusting the horizontal scale knob lets you zoom into acquired data.
Note that the horizontal position knob has a different purpose in the Zoom display.
Panning and Zooming Single or Stopped Acquisitions
When the oscilloscope is stopped, use the horizontal scale and position knobs to pan and zoom your waveform. The stopped display may contain several acquisitions worth of information, but only the last acquisition is available for pan and zoom.
The ability to pan (move horizontally) and scale (expand or compress horizontally) an acquired waveform is important because of the additional insight it can reveal about the captured waveform. This additional insight is often gained from seeing the waveform at different levels of abstraction. You may want to view both the big picture and the specific little picture details. The ability to examine waveform detail after the waveform has been acquired is a benefit generally associated with digital oscilloscopes. Often this is simply the ability to freeze the display for the purpose of measuring with cursors or printing the screen. Some digital oscilloscopes go one step further by including the ability to further examine the signal details after acquiring them by panning through the waveform and changing the horizontal scale. There is no limit imposed on the scaling ratio between the time/div used to acquire the data and the time/div used to view the data. There is, however, a useful limit. This useful limit is somewhat a function of the signal you are analyzing.
Edited by WisdomAugust at 2021-10-14 08:02
To display the zoomed time base
Zoom, formerly called Delayed sweep mode, is a horizontally expanded version of the normal display. When Zoom is selected, the display divides in half. The top half of the display shows the normal time/div window and the bottom half displays a faster Zoom time/div window.
The Zoom window is a magnified portion of the normal time/div window. You can use Zoom to locate and horizontally expand part of the normal window for a more detailed (higher-resolution) analysis of signals.
To turn on (or off) Zoom:
1 Press the zoom key ( press the Horiz scale knob ).
The area of the normal display that is expanded is outlined with a box and the rest of the normal display is ghosted. The box shows the portion of the normal sweep that is expanded in the lower half. To change the time/div for the Zoom window, turn the horizontal scale (sweep speed) knob. The Horizontal scale (sweep speed) knob controls the size of the box. Compared with the time/div of normal window, the time/div for the Zoom window has increased the waveformresolution. The Horizontal position (delay time) knob sets the left-to-right position of the zoom window. To change the time/div of the normal window, turn off Zoom; then, turn the horizontal scale (sweep speed) knob. Note: The time/div of the zoomed window should be smaller than or equal to the time/div of the normal window.
Horizontal Expansion Horizontal expansion indicates the reference position that the screen waveform is referenced to when it is horizontally expanded or contacted in adjusting the Horizontal SCALE knob. In YT mode, press Acquire-> Horiz Expand to select the desired reference position. The horizontal expansion reference supported by the oscilloscope includes Screen Center, Trigger Point.
The default is "Screen Center". * Screen Center: when the time/div ( horizontal time base) is modified, the waveform will be expanded or contracted horizontally relative to the center of the display. * Trigger Point: when the time/div ( horizontal time base) is modified, the waveform will be expanded or contracted horizontally relative to the trigger point. lNote: This function is unavailable in YT mode with the delayed sweep being enabled
Vertical Controls
To turn waveforms on or off (channel or math) To adjust the vertical scaleTo adjust the vertical positionTo specify channel coupling To specify channel input impedance To specify bandwidth limitingTo change the vertical scale knob's coarse/fine adjustment setting To set analog channel probe options To invert a waveform To set channel label
The vertical controls include: ? The vertical scale and position knobs for each analog channel. ? The channel keys for turning a channel on or off and accessing the channel's softkey menu.
The following figure shows the Channel 1 Menu that appears after pressing the channel key
The ground level of the signal for each displayed analog channel is identified by the position of the icon at the far-left side of the display.
Edited by WisdomAugust at 2021-11-5 08:18
To turn waveforms on or off (channel or math) 1 Press an analog channel key turn the channel on or off (and to display the channel's menu). When a channel is on, its key is illuminated.
NOTE Turning channels off You must be viewing the menu for a channel before you can turn it off. For example, if channel 1 and channel 2 are turned on and the menu for channel 2 is being displayed, to turn channel 1 off, press to display the channel 1 menu; then, press again to turn channel 1 off.
To adjust the vertical scale1 Turn the large knob below the channel key marked to set the vertical scale (volts/division) for the channel.The vertical scale knob changes the analog channel scale in a 1-2-5 step sequence (with a 1:1 probe attached) unless fine adjustment is enabled. The analog channel Volts/Div value is displayed in the status line. The default mode for expanding the signal when you turn the volts/division knob is vertical expansion about the ground level of the channel; however, you can change this to expand about the center of the display.
To adjust the vertical position 1 Turn the small vertical position knob to move the channel's waveform up or down on the display. The offset voltage value represents the voltage difference between the vertical center of the display and the ground level icon. It also represents the voltage at the vertical center of the display if vertical expansion is set to expand about ground.
To specify channel coupling Coupling changes the channel's input coupling to either AC (alternating current), DC (direct current), or GND (ground).
TIP If the channel is DC coupled, you can quickly measure the DC component of the signal by simply noting its distance from the ground symbol. If the channel is AC coupled, the DC component of the signal is removed, allowing you to use greater sensitivity to display the AC component of the signal.