DSO5000 Series Quick Start Guide

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3.6 To change the Volts/Div control sensitivity

When you need to adjust the amplitude/div setting in smaller increments, you can change the sensitivity of the vertical scale control.
?If the channel’s menu is not currently displayed, press the channel key (CH1 MENU, or CH2 MENU).
?In the Channel menu, press Volts/Div to toggle between:

?Coarse The vertical scale knob changes the amplitude/div setting in a 1- 2- 5 step sequence from 2 mV/div to 10 V/div (with “1X” probe attenuation).
?Fine Also known as vernier, the vertical scale knob changes the amplitude/div setting in small steps between the normal (coarse scale) settings.

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3.7 To specify the probe attenuation

For correct measurements, you must match the oscilloscope’s probe attenuation factor settings with the attenuation factors of the probes being used.

The probe attenuation factor setting changes the vertical scaling of the oscilloscope so that the measurement results reflect the actual voltage levels at the probe tip.

? If the channel’s menu is not currently displayed, press the channel key ( CH1 MENU, or CH2 MENU).

? In the Channel menu, press Probe.

? Continue pressing the Probe softkey to select between:

l 1X For 1:1 probes.

l 10X For 10:1 probes.

l 100X For 100:1 probes.

l 1000X For 1000:1 probes

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3.9 Using Math Function Waveforms

3.9.1 The math functions control allows the selection of the math functions:

? Add.

? Subtract.

? Multiply.

? Divide.

? FFT (Fast Fourier Transform).

The mathematical result can be measured using the grid and cursor controls.

The amplitude of the math waveform can be adjusted using a menu item selection in the Math menu.

The math scale setting is shown at the bottom of the Math menu.

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3.9.2 To add, subtract, multiply, or divide waveforms

1. Press MATH MENU.

2. In the Math menu, press Operation.

3. Continue pressing the Operation softkey to select “CH1+ CH2”, “CH1- CH2”, “CH2-CH1”, “CH1 x CH2”, “CH1/CH2”, or “CH2/CH1”.

4. Press Position softkey and turn multifuction knob to adjust the position of the math waveform.

5. Press Scale, and turn multifuction knob to adjust the math scale.

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3.9.3 To display the frequency domain using FFT

The FFT math function mathematically converts a time- domain waveform

into its frequency components. FFT waveforms are useful for finding the

harmonic content and distortion in systems, for characterizing noise in DC

power supplies, for analyzing vibration, for estimating the impulse responses in systems, and for measuring the harmonic in power cords.

To display a waveform’s FFT:

1.Press MATH MENU.

2.In the Math menu, press Operation.

3.To select “FFT”.

4. Press Sourcesoftkey to select the desired input channel.

NOTE

? The FFT of a waveform that has a DC component or offset can cause incorrect FFT waveform magnitude values. To minimize the DC component, choose AC Coupling on the source waveform.

? To reduce random noise and aliasing components (in repetitive or single-shot waveforms), set the oscilloscope acquisition mode to averaging.

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If the number of cycles is non-integral, the YT waveform starts and ends at different amplitudes and transitions between the start and end points will cause discontinuities in the signal that introduces high-frequency transients.

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Applying a window to the YT waveform changes the waveform so that the start and stop values are close to each other, which reduces the discontinuities.