2: General operation Model 2461 Interactive SourceMeter® Instrument
2-124 2461-901-01 A/November 2015
Ranges
You can set ranges for the source and measurement values. You can set specific ranges or allow the
instrument to choose the ranges automatically.
The source range determines how accurately the source output can be set.
The measurement range determines the full-scale input for the measurement. The measurement
range also affects the accuracy of the measurements and the maximum signal that can be measured.
The highest available range is determined by the limit setting for the function that is being sourced or
measured.
Source range
For most applications, you will select the automatic source range. This causes the instrument to set
the source range to the best range for the present settings.
You cannot select autorange when you are using the digitize functions.
In most cases, the only reason you would select a specific source range is to reduce the time that is
needed to make a measurement. Selecting a specific range eliminates the time that the instrument
needs to select the range automatically.
If you set the source range manually through either the front panel or a remote command, the setting
for automatic source range is set to disabled.
The selected source range must be within the limit set by the overvoltage protection limit. When the
overvoltage protection level is exceeded, OVP is displayed in the SOURCE area of the Home screen.
To select the range, specify the approximate source value that you will use. The instrument selects
the lowest range that can accommodate that level. For example, if you expect to source levels around
3 V, send the command set to 0.05 (or 50e-3) to select the 200 mV range.
Selecting a specific source range
If you select a specific source range, the range must be large enough to source the value. If not, an
overrange condition can occur.
If an overrange condition occurs, an event is displayed and the change to the setting is ignored.
The fixed current source ranges are 1 µA, 10 µA, 100 µA, 1 mA, 10 mA, 100 mA, 1 A, 4 A, 5 A, 7 A,
and 10 A. Note that if the 10 A range is selected, the maximum source output level is 7.35 A unless
pulsing is active.
The fixed voltage source ranges are 200 mV, 2 V, 7 V, 10 V, 20 V, and 100 V.
From the front panel:
1. Press the HOME key.
2. Under SOURCE, select the button next to Range. The Select Range dialog box is displayed.
3. Select the range.
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