User`s guide

Remarks
You can allow the instrument to automatically select the measurement
range using autoranging or you can select a fixed range using manual
ranging. Autoranging is convenient because the instrument decides which
range to use for each measurement based on the input signal. For faster
measurements, use manual ranging on each measurement (some
additional time is required for autoranging since the instrument has to
make a range selection).
If you select autoranging (by specifying "AUTO" or "DEF"), an error will be
generated if you specify a discrete value for the <resolution> parameter.
When autoranging is combined with a discrete resolution, the instrument
cannot accurately resolve the integration time (especially if the input
signal is continuously changing). If your application requires autoranging,
be sure to specify "DEF" for the <resolution> parameter or omit the
parameter from the command.
Autorange thresholds:
Down
range at:
<10% of range
Up range
at:
>120% of range
If the input signal is greater than can be measured on the selected range
(manual ranging), the instrument gives an overload indication: "±OVLD"
from the front panel or "±9.9E+37" from the remote interface.