Keithley 2601B Reference Manual page 63

Series 2600B System SourceMeter® Instrument Reference Manual
Ohms ranging
The front panel ohms function does not use ranging. The instrument formats a calculated resistance
reading (V/I) to best fit the display. There may be leading zeros if the ohms reading is less than 1 mΩ.
Basic ohms measurement procedure
When you use the MODE key to select ohms measurement, the Series 2600B is automatically
configured as a current source with a level of 1 mA. If you wish to change the source function, source
value, or compliance value (in other words, if you wish to customize the MODE key's standard ohm-
meter's configuration), then perform the following steps to perform ohms measurements. The
following procedure assumes that the Series 2600B is already connected to the device under test
(see DUT test connections
To take an ohms measurement:
This procedure requires dual-channel instruments (Models 2602B, 2604B, 2612B, 2614B, 2634B,
and 2636B) to be placed in single-channel display mode. For these models, press the DISPLAY key
to select single-channel display mode. See
1. Press the SRC key to select the source function.
2. Set the output source (current or voltage, dependent on which function is selected) to a value
based on the expected resistance. See
earlier in this section.
3. Press the LIMIT key to edit the voltage or current limit. When programming a voltage limit, set the
voltage limit above the maximum expected voltage across the resistor under test. When
programming a current limit, set the current limit at or above the maximum expected current
through the resistor under test. See
section.
4. Press the MEAS key to display voltage or current.
5. Make sure that AUTO measurement range is on (press the AUTO key if needed).
6. Press the MEAS key as many times as needed to display ohms.
7. Press the OUTPUT ON/OFF control to turn the output on.
8. View the displayed reading (press the TRIG key if necessary). When finished, press the OUTPUT
ON/OFF control again to turn the output off.
Remote ohms command
Use the smuX.measure.r() function to obtain a resistance reading. The programming example
below illustrates how to obtain a resistance reading from SMU A:
reading = smua.measure.r()
See Remote source-measure commands
source and measure functions, and
2600BS-901-01 Rev. B / May 2013
(on page 2-48)).
Display mode
Step 1: Select and set the source level
Step 2: Set the compliance limit
(on page 2-34) for more commands necessary to set up
Introduction to TSP operation
Section 2: General operation
(on page 2-24).
(on page 2-33) earlier in this
(on page 5-1) for more details.
(on page 2-33)
2-39