Keithley 6517A, User Manual

Page: 245 / 343

IEEE-488 Reference
3-94
:LLIMit <n>
[:SENSe[1]:RESistance[:AUTO]:RANGe:AUTO:LLIMit <n> Set lower limit for Auto V-Source Ohms
Parameters <n> = 0 to 100e18 Range limit for Auto V-Source Ohms
DEFault 100e18
MINimum 0
MAXimum Same as DEFault
Query :ULIMit? Query upper range limit
:ULIMit? DEFault Query *RST default upper limit
:ULIMit? MINimum Query lowest allowable upper limit
:ULIMit? MAXimum Query largest allowable upper limit
:LLIMit? Query lower range limit
:LLIMit? DEFault Query *RST default lower limit
:LLIMit? MINimum Query lowest allowable lower limit
:LLIMit? MAXimum Query largest allowable lower limit
Description Automatic range changes slow down the reading rate. By setting upper and lower measurement
range limits, you can prevent inadvertent range changes to ranges that you are not going to use.
Note that these limits can only be set for Auto V-Source Ohms. They are not available for Man-
ual V-Source Ohms.
The upper range limit is selected by specifying the maximum expected reading that you expect
to measure. For example, if the maximum expected reading is approximately 1G
Ω
, let the pa-
rameter (<n>) = 1e9.The lowest (most sensitive) range that can measure 1G
Ω
is the 2G
Ω
range.
Thus, the 2G
Ω
range is selected as the upper range limit. With this upper limit, the instrument
cannot uprange to the 20G
Ω
(or higher) measurement range.
The lower range limit is selected by specifying the lowest expected reading that you expect to
measure.
:VSOurce:RANGe <n>
[:SENSe[1]:RESistance:MANual:VSOurce:RANGe <n> Set V-Source range for Manual V-Source Ohms
Parameters <n> = 0 to 1000 Specify output in volts
DEFault 100V range
MINimum 100V range
MAXimum 1000V range
Query :RANGe? Query V-Source range
:RANGe? DEFault Query *RST default V-Source range
:RANGe? MINimum Query lowest allowable range
:RANGe? MAXimum Query largest allowable range
Description This command is used to select the optimum V-Source range for Auto V-Source Ohms. Speci-
fying the output voltage value automatically selects the most sensitive range. For example, spec-
ifying a value less than or equal to 100 selects the 100V range. Specifying a value greater than
100 selects the 1000V range.
You cannot select the 100V range if the programmed amplitude (see next command) is greater
than 100V. A setting conflict error will result.