Keithley 6482, Справочное руководство

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16-36 Return to Section Topics 6482-901-01 Rev. A / August 2012
Section 16: SCPI Command Reference Model 6482 Dual-Channel Picoammeter / Voltage Source Reference Manual
Query :RANGe? Query measurement range
:RANGe? DEFault Query *RST default range
:RANGe? MINimum Query lowest range (returns 0)
:RANGe? MAXimum Query highest range
Description These commands are used to manually select the measurement range for
channel 1 and channel 2. The range is selected by specifying the expected
reading. The instrument will then go to the most sensitive reading that will
accommodate that reading. For example, if you expect a reading of approximately
5 mA, then simply let <n> = 0.005 (or 5e-3) in order to select the 20 mA range.
You can also use the UP and DOWN parameters to select range. Each time UP or
DOWN is sent, the next higher or lower measurement range is selected. When on
the maximum range, sending UP is a NO-Op (no operation). When on the lowest
range, sending DOWN is a NO-Op.
Measurement ranges can instead be automatically selected by the instrument.
See
“AUTO <b>,” page Section 16-36.
Select autorange
AUTO <b>
[:SENSe[1]]:CURRent[:DC]:RANGe:AUTO <b>Control autoranging for channel 1
:SENSe2:CURRent[:DC]:RANGe:AUTO <b>Control autoranging for channel 2
Parameters <b> = 0 or OFF Disable autorange
1 or ON Enable autorange
Query :AUTO? Query state of autorange
Description This command is used to control autoranging. With autoranging enabled, the
instrument automatically goes to the most sensitive range to perform the
measurement.
When this command is used to disable autorange, the instrument remains at the
automatically selected range. When a range is manually selected, autorange is
disabled. See the previous command.
LLIMit <n>
[:SENSe[1]]:CURRent[:DC]:RANGe:AUTO:LLIMit <n>Set autoranging lower limit
for channel 1
:SENSe2:CURRent[:DC]:RANGe:AUTO:LLIMit <n>Set autoranging lower limit for
channel 2
Parameters <n> = -21e-3 to 21e-3 Lower limit
DEFault
2e-9
MINimum 0
MAXimum 20e-3
Query :LLIMit? Query autorange lower limit
Description The lower limit programmed by these commands for both channels must be less
than or equal to the upper limit. If the lower limit is equal to the upper limit,
autoranging is effectively disabled. See below. When autoranging is disabled, you
can manually program the instrument for any range above the lower limit.