Keithley 2001 User Manual

IEEE-488 Reference
4-132
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
Short-form formats: :curr:ac:rang:auto:ulim?
:curr:ac:rang:auto:ulim? xxx
:curr[:dc]:rang:auto:ulim?
:curr[:dc]:rang:auto:ulim? xxx
:volt:ac:rang:auto:ulim?
:volt:ac:rang:auto:ulim? xxx
:volt[:dc]:rang:auto:ulim?
:volt[:dc]:rang:auto:ulim? xxx
:res:rang:auto:ulim?
:res:rang:auto:ulim? xxx
:fres:rang:auto:ulim?
:fres[:dc]:rang:auto:ulim? xxx
:curr:ac:rang:auto:llim?
:curr:ac:rang:auto:llim? xxx
:curr[:dc]:rang:auto:llim?
:curr[:dc]:rang:auto:llim? xxx
:volt:ac:rang:auto:llim?
:volt:ac:rang:auto:llim? xxx
:volt[:dc]:rang:auto:llim?
:volt[:dc]:rang:auto:llim? xxx
:res:rang:auto:llim?
:res:rang:auto:llim? xxx
:fres:rang:auto:llim?
:fres[:dc]:rang:auto:llim? xxx
where; xxx = def, min or max
Response message: 0 to 1050000000
Description Automatic range changes take time and slow down the reading rate. By setting upper and lower
measurement range limits, you can prevent inadvertent range changes to ranges that you do not
want to use. As a result, you can speed up the reading rate while using autorange.
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 pa-
rameter (<n>) = 0.1 (or 100e-3). The lowest (most sensitive) range that can measure 100mA is
the 200mA range. Thus, the 200mA range will be 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. For example, if the lowest expected reading is approximately 10mA, let the parameter
(<n>) = 0.01 (or 10e-3). The lowest range that can measure 10mA is the 20mA range. Thus, the
20mA range will be selected as the lower range limit. With this lower limit, the instrument can-
not downrange to the 2mA and 200µA measurement ranges.

Keithley 2001 Specifications

General

Model	2001
Category	Multimeter
Manufacturer	Keithley
Type	Digital Multimeter
Digits of Resolution	7.5
DC Voltage Range	100 mV to 1000 V
AC Voltage Range	100 mV to 750 V
Frequency Range	3 Hz to 500 kHz
Connectivity	GPIB, RS-232
Display	VFD
Resistance Accuracy	0.008% + 2.0 mΩ
Frequency Accuracy	±0.01%
DC Current Range	10 μA to 3 A
AC Current Range	10 μA to 3 A
Power Supply	100 V to 240 V AC, 45 Hz to 66 Hz