Lecroy WaveSurfer 3054 4-channel oscilloscope, Digital Storage oscilloscope, WaveSurfer 3054 User Manual
Product codes
WaveSurfer 3054
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A B O U T
R E M O T E
C O N T R O L
58
ISSUED: February 2005
WM-RCM-E Rev D
CALCULATE A DATA POINT’S HORIZONTAL POSITION
Each vertical data value has a corresponding horizontal position, usually measured in time or frequency units.
The calculation of this position depends on the type of waveform. Each data value has a position, i, in the
original waveform, with i = 0 corresponding to the first data point acquired. The descriptor parameter
original waveform, with i = 0 corresponding to the first data point acquired. The descriptor parameter
HORUNIT gives a string with the name of the horizontal unit.
Single Sweep waveforms: x[i] = HORIZ_INTERVAL x i + HORIZ_OFFSET. For acquisition waveforms
this time is from the trigger to the data point in question. It will be different from acquisition to acquisition
since the HORIZ_OFFSET is measured for each trigger. In the case of the data shown above this means:
since the HORIZ_OFFSET is measured for each trigger. In the case of the data shown above this means:
HORIZ_INTERVAL = 1e-08 from the floating point number 322b cc77 at Byte 194
HORIZ_OFFSET = -5.149e-08 from the double precision floating point number be6b a4bb 51a0 69bb
at Byte 198
HORUNIT = S = seconds from the string 5300 ... at Byte 262
This gives:
x[0] = -5.149e-08 S
x[1] = -4.149e-08 S.
x[1] = -4.149e-08 S.