MPO6002EDU Series Oscilloscope Guide

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To specify bandwidth limiting

1 Press the desired channel key.

2 In the Channel Menu, press the BW Limit softkey to enable or disable bandwidth limiting.

When bandwidth limit is on, the maximum bandwidth for the channel is approximately 20 MHz. For waveforms

with frequencies below this, turning bandwidth limit on removes unwanted high frequency noise from the waveform.

The bandwidth limit also limits the trigger signal path of any channel that has BW Limit turned on.

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To specify channel input impedance

NOTE

When you connect an AutoProbe, self-sensing probe, the oscilloscope automatically configures the analog

input channels to the correct impedance.

1 Press the desired channel key.

2 In the Channel Menu, press Impedance; then, select either:

* 50 Ohm - matches 50 ohm cables commonly used in making high frequency measurements, and 50 ohm

active probes.

When AC coupling is selected or excessive voltage is applied to the input, the oscilloscope automatically

switches to 1M Ohm mode to prevent possible damage.

* 1M Ohm - is for use with many passive probes and for general-purpose measurements. The higher impedance

minimizes the loading effect of the oscilloscope on the device under test.

This impedance matching gives you the most accurate measurements because reflections are minimized along

the signal path.

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1 Press the desired channel key.

2 In the Channel Menu, press the Coupling softkey to select the input channel coupling:

* DC - DC coupling is useful for viewing waveforms as low as 0 Hz that do not have large DC offsets.

* AC - AC coupling is useful for viewing waveforms with large DC offsets.

* GND - When the coupling mode is "GND", the DC and AC components of the signal under test are both blocked.

When AC coupling is chosen, you cannot select 50Ω mode. This is done to prevent damage to the oscilloscope.

AC coupling places a 10 Hz high-pass filter in series with the input waveform that removes any DC offset voltage

from the waveform.

Note that Channel Coupling is independent of Trigger Coupling.

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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.

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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 [1] to display the

channel 1 menu; then, press [1] again to turn channel 1 off.

To adjust the vertical scale

1 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.

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The following figure shows the Channel 1 Menu that appears after pressing the [1] 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.

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Vertical Controls

To turn waveforms on or off (channel or math)

To adjust the vertical scale

To adjust the vertical position

To specify channel coupling

To specify channel input impedance

To specify bandwidth limiting  

To 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.

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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.

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Note: This function is unavailable in YT mode with the delayed sweep being enabled

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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 waveform  resolution.

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.

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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         ).