Specifications
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The buttons on the control panel mirror the buttons on the scope and you can operate the scope
remotely. This is a powerful tool, as the scope can be across the room or half-way around the world.
The web browser should let you save the displayed image of the scope's screen. This is typically done
by right clicking the image with the mouse and saving to a file or copying the image to the clipboard.
To return to local control by the oscilloscope's keyboard, you'll have to press a button to disconnect the
LAN connection (a similar thing occurs when the scope is remotely controlled over a USB connection).
For the B&K 254xB scopes, the button to press is the AMPL button.
Math calculations
Digital scopes allow mathematical operations to be applied to the waveforms. The choices are typically
A+B, A-B, AxB, and FFT (fast Fourier transform). Here, A and B denote the source channels and are
usually set so that A is channel 1 and B is channel 2. However, you can do such things as set the math
operation to AxB and set both A and B to be channel 1 and see the square of the waveform being
measured on channel 1.
The subtraction operation lets you look at the difference between two signals and is often used as the
"poor man's differential amplifier".
The product AxB can be used to show the instantaneous power waveform across a circuit element if
one channel measures the voltage and the other channel measures the current. Unless you have a
current probe that provides a signal referenced to ground, you'll probably need a differential amplifier to
make such a measurement in general.
The math display is toggled on and off by pressing the MATH button 12. The following picture shows a
clipped 1 kHz sine wave with its FFT displayed:
Figure 25
The FFT is shown in red and the vertical scale of the FFT is linear (the other scale choice is
logarithmic). The horizontal position knob was used to position the FFT trace so that the second peak
was measured at 2 kHz, making it the second harmonic.
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