Autorange - HP E1326B User Manual

Autorange

Setting Autorange
Querying the Range
Note
94 Understanding the HP E1326B/E1411B Multimeter
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The default range is autorange. Autorange is the process where the
multimeter samples the input signal, and then automatically selects the
correct (lowest valid) range. Consider the following when using autorange:
1. Autoranging typically adds 150 µs to the fixed range measurement
time if it ranges up one range, or ranges down any number of ranges.
Each reading takes an additional 50 µs for each additional range-up
step. If autoranging is enabled but does not occur, approximately
100 µs is added to the fixed range measurement time. The
E1326B/E1411B automatically switches to the 10 µs aperture time
when making measurements to determine the correct range.
2. For maximum speed, group channels together which use the same
range. When the aperture time is 10 µs and autoranging is enabled
but does not occur, the measurement rate is 2380 readings/second.
3. Use autorange to simplify thermocouple, thermistor, and RTD
measurements.
Autorange is set when AUTO
MEASure or CONFigure command. Autorange is also enabled and disabled
with the low-level commands:
VOLTage:RANGe:AUTO
RESistance:RANGe:AUTO
where:
mode = ON (turns autorange on) or
The measurement range is queried with the following commands:
VOLTage:RANGe?
VOLTage:RANGe? MIN | MAX
VOLTage:AC:RANGe?
VOLTage:AC:RANGe? MIN | MAX
RESistance:RANGe?
RESistance:RANGe? MIN | MAX
Executing returns the range, resolution, and measurement
CONFigure?
function set by the CONFigure
When querying the range, the ranges available with the range command
(Table 4-5) are returned. For example, if a range of 0.113 V is set with the
or command, 0.125 is returned if the range is queried.
MEASure CONFigure
If 0.91 V is set, 1.0 is returned, and so on.
, DEF , or no range parameter is specified in the
mode
mode
OFF (turns autorange off).
command.
Chapter 4