Appendix A: MSO/
DPO4000B Warranted Specifications
Table 3: Horizontal and acquisition system specifications
Characteristi
c
Description
Long-term sample rate and
delay time accuracy
±5 ppm over any ≥1mstimeinterval
Delta-time measurement
accuracy
The formula to calculate the delta-time measurement accuracy (DTA) for a given
instrument setting and input signal is given below (assumes insignificant signal content
above Nyquist and insignificant error due to aliasing):
SR
1
= slew rate around 1st point in measurement (1
st
edge)
SR
2
= slew rate around 2nd point in measurement (2
nd
edge)
N =input-referred noise (V
RMS
)
TBA = time base accuracy (5 ppm)
t
p
= delta-time measurement duration (sec)
RD = (record length)/(sample rate)
t
sr
= 1/(sample rate)
assume edge shape that results from Gaussian filter response
The term under the s quare-root sign is the stability and is due to TIE (Time Interval
Error). The errors due to this term occur throughout a single-shot measurement.
The second term is due to both the absolute center-frequency accuracy and the
center-frequency stability of the time base and varies between multiple single-shot
measurements over the observation interval (the amount of time from the first
single-shot measurement to the final single-shot measurement). The observation
interval may not exceed 1 year.
Table 4: Digital acquisition s pecifications, MSO4000B series
Characteristic Description
Logic threshold accuracy
±(100 mV + 3% of threshold setting after calibration)
Requires valid SPC.
190 MSO4000B and DPO 4000B Series Oscilloscopes User Manual
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