Section 4: Sourcing and measuring Model 2601B-PULSE System SourceMeter Instrument Reference Manual
4-56 2601B-PULSE-901-01A April 2020
Ranging limitations
If the source and measure functions are different (such as source V and measure I, or source I and
measure V), you can set source and measure ranges separately. If both the source and the measure
functions are the same, the measure range is locked to the source range.
With the 40 V V-Source range selected, the highest current measurement range is 1 A. With the 3 A
I-Source range selected, the highest voltage measurement range is 6 V. Refer to Operating
boundaries (on page 7-6) for power derating information.
Autoranging
To use automatic source ranging, press SRC then the AUTO range key.
To use automatic measure ranging, press the MEAS key followed by the AUTO range key. The
AUTO indicator turns on when source or measure autoranging is selected.
When autorange is selected, the instrument automatically sets the best range to source or measure
the applied signal. The instrument will uprange at 100 percent of the present range.
When you change a source value, source autoranging is automatically turned off and remains off
until you re-enable it.
Low range limits
The low range limit sets the lowest range that the 2601B-PULSE will use when autoranging is
enabled. This feature is useful for minimizing autorange settling times when measurements require
numerous range changes.
To individually set low range limits for Source V, Source I, Measure V, and Measure I:
1. Press the CONFIG key, then press either the SRC key (for source) or the MEAS key (for
measure).
2. Select voltage or current source, or measure, as appropriate, and then press the ENTER key or
the navigation wheel .
3. Select LOWRANGE, and then press the ENTER key or the navigation wheel .
4. Set the low range to the appropriate setting, and then press the ENTER key or the navigation
wheel .
5. Press the EXIT (LOCAL) key twice to return to the main display.
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