Measuring Waveforms
TDS 500D, TDS 600B, & TDS 700D User Manual
3–147
To move the histogram box without changing its size, press MEASURE ➞
Measure (main) ➞ Histogram (pop-up) ➞ Histogram Box Limits (main).
Then toggle Move Box (side) to Horizontal or Vertical and use the general
purpose knob to move the histogram box. (The SELECT button will also toggle
Move Box.)
The TDS Oscilloscope provides you with 10 histogram measurements.
Table 3–12 lists brief definitions of the measurements.
Table 3–12: Measurement definitions
Name Definition
Mean The average of all acquired points within (or on) the histogram box.
Median Half of all acquired points within (or on) the histogram box are less than and half are greater
than this value.
StdDev The standard deviation (Root Mean Square (RMS) deviation) of all acquired points within (or on)
the histogram box.
Hits in Box Displays the number of points in the histogram box or on the box boundary.
Waveform Count Displays the number of waveforms that have contributed to the histogram.
Peak Hits Displays the number of points in the largest bin of the histogram.
Pk-Pk Displays the peak-to-peak value of the histogram. Vertical histograms display the “voltage” of
the highest nonzero bin minus the “voltage” of the lowest nonzero bin. Horizontal histograms
display the “time” of the rightmost nonzero bin minus the “time” of the leftmost nonzero bin.
Mean 1 StdDev The percentage of points in the histogram which are within 1 standard deviation of the
histogram mean.
Mean 2 StdDev The percentage of points in the histogram which are within 2 standard deviations of the
histogram mean.
Mean 3 StdDev The percentage of points in the histogram which are within 3 standard deviations of the
histogram mean.
Histogram measurements are displayed in the same location as other measure-
ments. (See Figure 3–59 on page 3–129.)
To Move the Histogram
Box
Histogram Measurement
List
Measurement Readouts
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