Keithley 6517A User Manual

IEEE-488 Reference
3-90
:NPLC:AUTO is coupled to the command that manually sets the NPLC value (:NPLC <n>).
When auto NPLC is enabled, the parameter value for :NPLC <n> changes to the automatically
selected NPLC value. Thus, when auto NPLC is disabled, NPLC remains at the automatically se-
lected value. Also, a valid NPLC value sent using the :NPLC <n> command disables auto NPLC.
Auto NPLC is also coupled to auto aperture. Enabling or disabling auto NPLC also enables or
disables auto Aperture. Also, a valid aperture value sent using the :APERture command disables
auto NPLC.
3.19.6 RANGe commands
Volts, Amps and Coulombs Ranges:
[:UPPer] <n>
[:SENSe[1]]:VOLTage[:DC]:RANGe[:UPPer] <n> Set measurement range for Volts
[:SENSe[1]]:CURRent[:DC]:RANGe[:UPPer] <n> Set measurement range for Amps
[:SENSe[1]]:CHARge:RANGe[:UPPer] <n> Set measurement range for Coulombs
Parameters <n> = 0 to 210 Expected reading in volts
0 to 21e-3 Expected reading in amps
0 to 2.1e-6 Expected reading in coulombs
DEFault 210 (volts)
21e-3 (amps)
2.1e-6 (coulombs)
MINimum 0 (all functions)
MAXimum Same as DEFault
Query :RANGe[:UPPer]?Query programmed measurement range
:RANGe[:UPPer]? DEFault Query *RST default range
:RANGe[:UPPer]? MINimum Query lowest measurement range
:RANGe[:UPPer]? MAXimum Query highest measurement range
Description This command is used to manually select the measurement range for the specified measurement
function. The range is selected by specifying the expected reading as an absolute value. The
Model 6517A will then go to the most sensitive range that will accommodate that expected read-
ing. For example, if you expect a reading of approximately 10mA, simply let the parameter
(<n>) = 0.01 (or 10e-3) in order to select the 20mA range.
:AUTO <b>|ONCE
[:SENSe[1]]:VOLTage[:DC]:RANGe:AUTO <b>|ONCE Control auto range for Volts
[:SENSe[1]]:CURRent[:DC]:RANGe:AUTO <b>|ONCE Control auto range for Amps
[:SENSe[1]]:CHARge:RANGe:AUTO <b>|ONCE Control auto range for Coulombs
Parameters <b> = 1 or ON Enable auto range
0 or OFF Disable auto range
ONCE Enable and then disable auto range
Query :AUTO? Query autorange (on or off)
Description These commands are used to control autoranging. With autoranging enabled, the instrument au-
tomatically goes to the most sensitive range to perform the measurement (see paragraph 2.12.4
for details).
The ONCE parameter is analogous to a momentary toggle switch. When :RANGe:AUTO
ONCE is sent, auto range enables and the most sensitive range is selected for the input signal.
Auto range will then disable, but the selected measurement range is retained. Note that the in-

Keithley 6517A Specifications

General

Brand	Keithley
Model	6517A
Category	Measuring Instruments
Language	English