Teledyne LeCroy WaveMaster 8 Zi_Zi-A - Manual (Page 158)

WaveMaster 8 Zi/Zi-A Oscilloscopes
150 922133-00 Rev A
Best Accuracy will ensure that the oscilloscope always maintains the best
possible accuracy at all all times and meets warranted specifications, even
during wide temperature variations. It achieves this by constantly and
internally sensing operating temperatures and performing small
adjustments to meet warranted specifications regardless of internal or
external temperature changes (provided that the oscilloscope is operated
within its specified temperature range). This is a unique capability to
LeCroy in that no user intervention is required to maintain warranted
specifications.
Reduced Calibration Frequency automatically calibrates each unique
oscilloscope setting (defined by V/div, time/div, sample rate, temperature,
trigger source, etc.) and stores the calibration values in a non-volatile table
that is saved during a power off state. These calibration values are recalled
when that particular setting is returned to by the user. The table is of a
finite length and settings are stored to it in a first-in first-out basis (FIFO),
so the longer an oscilloscope is used with the same types of settings, the
less it will calibrate when settings are changed. Note that if Reduce
Calibration Frequency is selected, the warranted specifications of the unit
are achieved only after the Calibrate Current State operation is performed.
Note also that this method cannot be enabled if external clocking is being
used.
The Enable Temperature Dependent Calibration capability will ensure,
when checked, that the oscilloscope will re-calibrate if the internal
temperatures change by more than ±3°C. LeCroy recommends that this
always be enabled.
If your oscilloscope did not ship with these capabilities enabled, it can be
enabled with an upgrade to XStreamDSO Software vs. 6.9.0.3 and a return
to a LeCroy Service Center for re-calibration.