3: LPTLib command reference S530/S540 KTE Linear Parametric Test Library (LPTLib) User's Manual
3-60 S530-900-01 Rev. E / September 2017
rangeX
This command selects a range and prevents the selected instrument from autoranging.
Usage
int rangec(int instr_id, double range);
int rangei(int instr_id, double range);
int rangev(int instr_id, double range);
The instrument identification code; SMUn, CMTRn, IMTRn, VMTRn, PSRCn
The value of the highest measurement to be made (the most appropriate range for
this measurement is selected); if
range
is set to 0, the instrument autoranges
Details
Use the rangeX command to eliminate the time required by automatic range selection on a
measuring instrument. Because the rangeX command prevents autoranging, an overrange conditi
on
c
an occur (for example, when measuring 10 V on a 2 V range). The value is returned when this
occurs.
The rangeX command can also reference a source, because a source-measure unit (SMU) can b
e
ei
ther of the following:
• Simultaneously a voltage source, voltmeter, and current meter.
• Simultaneously a current source, current meter, and voltmeter.
The range of a SMU is the same for the source and the measure commands.
When selecting a range below the limit value, whether it is explicitly programmed or the default value,
an instrument temporarily uses the full-scale value of the range as the limit. This does not change the
programmed limit value, and if the instrument range is restored to a value higher than the
programmed limit value, the instrument again uses the programmed limit value.
When changing the instrument range, be careful not to overrange the instrument. For example, a test
initially performed on the 10 mA range with a 5 mA limit is changed to test in the 1 mA range with a
1 mA limit. Notice that the limit is lowered from 5 mA to 1 mA to avoid overranging the 1 mA setting.
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