Keithley 2002 User Manual

IEEE-488 Reference
3-97
:RANGe[:UPPer]? Query ACI measurement range
:RANGe[:UPPer]? DEFault Query *RST default range
:RANGe[:UPPer]? MINimum Query lowest measurement range
:RANGe[:UPPer]? MAXimum Query highest measurement range
This command is used to manually select the measurement range for the specifed measurement
function. The range is selected by specifying the expected reading as an absolute value. The
Model 2002 will then go to the most sensitive range that will accommodate that expected read-
ing. For example, if you expect a reading of approximately 100mA, simply let the parameter
(<n>) = 0.1 (or 100e-3) in order to select the 200mA range.
PRINT #1, "output 16; :curr:ac:rang 1; rang?" ' Select 2A ACI range
PRINT #1, "enter 16" ' Get response from 2002
:AUTO <b>|ONCE
[:SENSe[1]]:CURRent:AC:RANGe:AUTO <b>|ONCE Control auto range for ACI
[:SENSe[1]]:CURRent:DC:RANGe:AUTO <b>|ONCE Control auto range for DCI
[:SENSe[1]]:VOLTage:AC:RANGe:AUTO <b>|ONCE Control auto range for ACV
[:SENSe[1]]:VOLTage:DC:RANGe:AUTO <b>|ONCE Control auto range for DCV
[:SENSe[1]]:RESistance:RANGe:AUTO <b>|ONCE Control auto range for Ω2
[:SENSe[1]]:FRESistance:RANGe:AUTO <b>|ONCE Control auto range for Ω4
<b> = 1 or ON Enable auto range
0 or OFF Disable auto range
ONCE Enable and then disable auto range
:AUTO? Query autorange (on or off)
These commands are used to control autoranging. With autoranging enabled, the instrument
automatically goes to the most sensitive range to perform the measurement (see paragraph 2.5.4
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
instrument must currently be on the specified function in order for ONCE to be effective. Using
ONCE while on any other function results in an error.
The autorange command (:RANGe:AUTO) is coupled to the command that manually selects
the measurement range (:RANGe <n>). When autorange is enabled, the parameter value for
:RANGe <n> changes to the automatically selected range value. Thus, when autorange is dis-
abled, the instrument remains at the automatically selected range. When a valid :RANGe <n>
command is sent, autoranging disables.
When using auto range, upper and lower range limits can be established to keep the instrument
from autoranging to ranges that are not going to be used. (see :AUTO: ULIMit and
:AUTO:LLIMit commands).
PRINT #1, "output 16; :curr:ac:rang:auto on; auto?" ' Enable auto range for
ACI
PRINT #1, "enter 16" ' Get response from 2002
Query
Description
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Parameters
Query
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Keithley 2002 Specifications

General

Resolution	8.5 digits
DC Voltage Accuracy	±0.0006%
Maximum DC Voltage	1000 V
Maximum AC Voltage	750 V
Maximum DC Current	3 A
Maximum AC Current	3 A
Connectivity	GPIB, RS-232
DC Voltage Range	100 mV to 1000 V
AC Voltage Range	100 mV to 750 V
Resistance Range	10 Ω to 1 GΩ
Model	2002
Category	Multimeter
Interface	GPIB, RS-232
AC Current Accuracy	±0.1%
Frequency Range	0.1Hz to 300kHz
Display	VFD
Type	Digital
Power Supply	100-240V AC, 50/60Hz
Current Range (DC)	100 μA to 3 A
Current Accuracy (DC)	±0.01%
Current Range (AC)	100 μA to 3 A
Current Accuracy (AC)	±0.1%
DC Current Range	100 μA to 3 A
AC Current Range	100 μA to 3 A