Getting Started Tutorial
1
34405A User’s and Service Guide
25
Selecting a Range
You can let the multimeter automatically select the range 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 the multimeter does
not have to determine which range to use for each measurement.
• The ManRng
annunciator is on when manual range is enabled.
•
Autoranging is selected at power- on and after a remote reset.
•
Manual ranging – If the input signal is greater than can be measured
on the selected range, the multimeter provides these overload
indications:
OL
from the front panel or “
\
9.9E+37” from the remote
interface.
•
For frequency measurements, ranging applies to the signal’s input
voltage, not its frequency.
•
The range is fixed for continuity (1 k
Ω
range) and diode (1 VDC range).
•
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 <10% of current range
Up range at >120% of current range
•
For remote operation, refer to the MEASure Subsystem in the
Agilent
34405A Online Programmer’s Reference
online help.
Selects a lower range and disables autoranging.
Selects a higher range and disables autoranging.
Selects autoranging and disables manual ranging.
Shift
Auto
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