Keithley 3700 series, Справочное руководство, Страница: 253 / 434

Series 3700 System Switch/Multimeter Reference Manual Section 9 : Instrument Control Library (ICL)
Document Number: 3700S-901-01 Rev. A / August 2007 9-109
dmm.range
Remarks This attribute is the range setting for the selected function (see dmm.func) of the DMM.
Querying the range when the selected function does not have a range associated with it
will cause nil to be returned.
The range will be selected based on which one best suits the expected measure value
(value parameter). The command is applicable when dmm.func = ―dcvolts‖ (0 to 303,
default 303), ―acvolts‖ (0 to 303, default 303), ―dccurrent‖ (0 to 3.1, default 3.1),
―accurrent‖ (0 to 3.1, default 3.1), ―twowireohms‖ (0 to 120e6, default 120e6) and
―fourwireohms‖ (0 to 120e6, default 120e6).
NOTE The values in parentheses represent the valid range setting for each function.
An error will be generated if the command is received when dmm.func is:

―temperature‖

―frequency‖

―period‖

―continuity‖

―nofunction‖.
Also, an error will be generated if parameter value does not make sense for selected
function.
Changing functions with dmm.func (on page 9-91) has no effect on this setting.
The factory default and dmm.reset function value is 303 since the default function is
"dcvolts"
.
Set this value to the expected measurement value and the unit will select the range
appropriate to measure that value.
Example To set the range for DC volts to 10:
dmm.func = "dcvolts"
dmm.range = 5
dmm.refjunction
Attribute Indicates the type of the thermocouple reference junction.
Usage
To read the reference junction type:
value = dmm.refjunction
value : Represents the present reference junction type.
To write the reference junction type:
dmm.refjunction = value
value : Represents the desired reference junction type. Use one of the following values:

dmm.REF_JUNCTION_SIMULATED or 0

dmm.REF_JUNCTION_INTERNAL or 1

dmm.REF_JUNCTION_EXTERNAL or 2