Keithley 2002 User Manual

IEEE-488 Reference
3-98
:ULIMit <n>
[:SENSe[1]]:CURRent:AC:RANGe:AUTO:ULIMit <n> Set upper limit for ACI
[:SENSe[1]]:CURRent:DC:RANGe:AUTO:ULIMit <n> Set upper limit for DCI
[:SENSe[1]]:VOLTage:AC:RANGe:AUTO:ULIMit <n> Set upper limit for ACV
[:SENSe[1]]:VOLTage:DC:RANGe:AUTO:ULIMit <n> Set upper limit for DCV
[:SENSe[1]]:RESistance:RANGe:AUTO:ULIMit <n> Set upper limit for Ω2
[:SENSe[1]]:FRESistance:RANGe:AUTO:ULIMit <n> Set upper limit for Ω4
:LLIMit <n>
[:SENSe[1]]:CURRent:AC:RANGe:AUTO:LLIMit <n> Set lower limit for ACI
[:SENSe[1]]:CURRent:DC:RANGe:AUTO:LLIMit <n> Set lower limit for DCI
[:SENSe[1]]:VOLTage:AC:RANGe:AUTO:LLIMit <n> Set lower limit for ACV
[:SENSe[1]]:VOLTage:DC:RANGe:AUTO:LLIMit <n> Set lower limit for DCV
[:SENSe[1]]:RESistance:RANGe:AUTO:LLIMit <n> Set lower limit for Ω2
[:SENSe[1]:FRESistance:RANGe:AUTO:LLIMit <n> Set lower limit for Ω4
<n> = 0 to 2.1 Range limit for ACI and DCI
0 to 775 Range limit for ACV
0 to 1100 Range limit for DCV
0 to 1.05e9 Range limit for Ω2
0 to 2.1e6 Range limit for Ω4
DEFault 2.1 (ACI and DCI)
775 (ACV)
1100 (DCV)
1.05e9 (Ω2)
2.1e6 (Ω4)
MINimum 0 (All functions)
MAXimum Same as DEFault
: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
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.
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 100mA, let the
parameter (<n>) = 0.1 (or 100e-3). The lowest (most sensitive) range that can measure 100mA
is the 200mA range. Thus, the 200mA range is selected as the upper range limit. With this upper
limit, the instrument cannot uprange to the 2A measurement range.
The lower range limit is selected by specifying the lowest expected reading that you expect to
measure.
PRINT #1, "output 16; :curr:ac:rang:auto:ulim 1" ' Set upper limit for ACI
' Set lower limit and query
limits
PRINT #1, "output 16; :curr:ac:rang:auto:llim 10e-3; ulim?; llim?"
PRINT #1, "enter 16" ' Get response from 2002
Parameters
Query
Description
Program fragment

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