Tektronix IsoVu TIVM Series, User Manual

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Operating information
Another source of aberrations is introduced when the signal is below the cutoff
frequency of the digital
fi lter (5.0 Hz). The following fi gure shows a close-up
view of the front edge of a 0.1 Hz 800 mV
p-p
square wave. These aberrations are
also created by the digital fi lter.
Figure 11: Digital fi lter aberrations (about 2.5% of V
p-p
)
The following fi gure shows the aberrations after the offset correction has been
disabled. When the offset correction is disabled, the system no longer corrects for
long-term drift due to temperature change and
fi ber movement.
16 TIVM Series Measurement System User Manual