Teledyne LeCroy HDO 4000 Operators Manual - Manual (Page 67)

HDO4000 High Definition Oscilloscope
8. Check Trace On to display the new math trace.
Enable/Disable Math Function
Once a math function has been created and saved in one of the Fx locations, just use the main Math
dialog to quickly enable/disable it.
Touch the Front Panel Math button, or from the menu bar, choose Math > Math Setup, then check the On
box next to each function you wish to display.
Clear the On box to disable the function and close the trace.
List of Math Functions
Standard math functions are listed below alphabetically.
NOTE: There may be additional math functions available depending on the software options installed on
the oscilloscope.
Function Definition
Absolute For every point in the waveform the distance away from zero is calculated. For values greater
than zero this is the same as the value. For values less than zero, the magnitude of this value
without regard to its sign is used.
Average Calculates either a summed or continuous average of a selected number of sweeps. See
Averaging Waveforms . The maximum number of sweeps is determined by the oscilloscope
model and memory. See the specifications at teledynelecroy.com.
Derivative Calculates the derivative of adjacent samples using the formula:
(next sample value – current sample value) / (horizontal sample interval)
DIfference For every point in the waveform, the value of Source2 is subtracted from the value of Source1.
Source1 and Source2 must have the same horizontal units and scale and the same vertical
units.
Envelope Calculates highest and lowest vertical values of a waveform at each horizontal value for a
specified number of sweeps.
ERes Applies a noise reduction and smoothing filter by adding a specified number of bits. See
Enhanced Resolution .
FFT Computes a frequency spectrum with optional Rectangular, Von Hann, Flat Topp, Hamming,
Blackman-Harris, and Hanning windows. Calculates up to 1 Mpts. Also allows FFT Averaging
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