3 Features and Functions
76 Keysight 34420A User’s Guide
Ranging
You can let the meter automatically select the range using autoranging or you can
select a fixed range using manual ranging. Autoranging is convenient because the
meter automatically selects the appropriate range for each measurement.
However, you can use manual ranging for faster measurements since the meter
does not have to determine which range to use for each measurement.
– The selected mode (auto or manual range) is stored in volatile memory; the
meter returns to autoranging when power has been off or after a remote
interface reset.
–Autorange thresholds:
Down range at <10% of range
Up range at >120% of range
– If the input signal is greater than the present range can measure, the meter
gives an overload indication: “OVLD” from the front panel or
“9.90000000E+37” from the remote interface.
– For ratio and difference measurements, the specified range is independent for
both Channel 1 and Channel 2.
– Front Panel operation: Press a front-panel RANGE key to set manual ranging
and to up or down range. Press the Auto/Man key to return to autoranging.
See also “To Select a Range” on page 53.
– Remote operation: Range is set with parameters in the MEASure and
CONFigure subsystems. For example:
CONF:VOLT:DC 10.0 Sets the 10 Volt DC range
Range can be set directly with the SENSe subsystem. For example:
SENS:VOLT:DC:RANGe 0.001 Sets the 1 mV DC range
SENS:RES:RANGE:AUTO Sets auto ranging on 2-wire
resistance measurements
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