Oscilloscope Reference Pretrigger data
Click Ch1-Ch2 and Ch3-Ch4 to create math waveforms that are the difference between two input
waveforms. Use these functions to view differential signals.
Click Ch1*Ch2 o r Ch3*Ch4 to create math waveforms that are the product of the two input
waveforms. For example, you can obtain a power waveform by multiplying a voltage waveform by
a current wav
eform.
Click Spectral Mag to create a spectral magnitude waveform.
Click Spectral Phase to create a spectral phase waveform.
The math waveform is based on the last active waveform on the sc reen. A spectral waveform is created
from a channel waveform; you cannot create a spe ctral waveform from math or reference waveforms.
TIP. Use the Equation Editor
(see page 257) to manually create and edit math waveforms.
What do you want to do next?
Learn about the Equation Editor. (see page 257)
Pretrigger data
The data points of the waveform acquired and displayed before the trigger e vent. You can set the amount
of pretrigger data with the Horizontal Position control.
Probe calibration output
Use the Probe Calibration output to calibrate or deskew passive or active voltage probes.
Probe calibration restrictions
Some probes cannot be calibrated or compensated. This might be because the probes have an attenuation
factor greater than 20X. You will get an error message if you try to compensate such a probe.
The instrument cannot compensate for probes that may have gain and/or offset errors that are too great
(>2% or >50 mV offset). If these errors are within the specified limits of your probe, you may want to use
another probe. If the errors are outside the limits, have your probe checked by service personnel.
Probe calibration is n ot recommended for the P5050 passive probe. This probe typically has little gain
and offset error, and therefore, the performance improvement after a probe calibration is not worth the
time needed to do the probe calibration.
898 DSA/DPO70000D, MSO/DPO/DSA70000C, DPO7000C, and MSO/DPO5000 Series
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