Keysight U3401A, Руководство пользователя и обслуживания

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Getting Started 1
Keysight U3401A User’s and Service Guide 43
Selecting a Range
You can allow the multimeter to select the range automatically by using
autoranging, or you can select a fixed range using manual ranging. Autoranging is
convenient because the multimeter automatically selects the appropriate range
for sensing and displaying each measurement. However, manual ranging results
in better performance, since multimeter does not have to determine which range
to use for each measurement.
– The range setting is synchronous for dual display for current or voltage
measurement. In autoranging mode, the range setting for both the primary
and secondary display are corresponding to the higher range of two displays.
– Manual ranging — If the input signal is greater than can be measured on the
selected range, the multimeter will display an overload indication, OL on the
primary or secondary display front panel.
– The multimeter remembers the selected ranging method (auto or manual) and
the selected manual range for each measurement function.
– Autorange thresholds - The multimeter shifts ranges as follows:
– Down range at < 5% of current range.
– Up range at > full scale of current range.
– Table 1-4 shows the summary of range scale values respectively.
Selects autoranging and disable manual ranging. Press to toggle
in and out of the manual ranging and autoranging.
Selects a higher range and disable autoranging.
Selects a lower range and disable autoranging.