Keithley SourceMeter 2400 Series - Table 5 Manual Ohms Measurement Procedure

14 Quick Results Guide
Offset-compensated ohms
Thermal EMFs can corrupt low-resistance measurements. An offset-compensated Ω
measurement cancels out unwanted offset by performing the following 2-point measurement
process:
Offset-Compensated Ω = ∆V / ∆I
where: ∆V = V2 - V1
∆I = I2 - I1
V1 and I1 are V and I measurements with the source set to a specific level.
V2 and I2 are V and I measurements with the source set to zero.
1. Select the Ω function, and select the auto or manual ohms measurement method.
2. Enable offset compensation by using the following menu sequence:
Press CONFIG > press MEAS Ω > select OFFSET COMPENSATION > select
ENABLE
3. If using auto ohms, go to the next step. For manual ohms, configure the desired source
(V or I) to output an appropriate source level. Set compliance and select a measurement
range (or use auto range).
4. Turn the output on and observe the offset-compensated ohms reading on the display.
Note that the source value alternates between the set output level and zero.
5. When finished, turn the output off and disable offset compensation.
Table 5
Manual ohms measurement procedure
Procedure Details
1. Select ohms measurement
function.
Press MEAS Ω.
2. Select manual ohms measurement
method.
Press CONFIG > press MEAS Ω > select SOURCE
> select MANUAL.
3. Select source, set source level, and
set compliance limit.
See steps 1, 2, and 3 of Table 2.
4. Select measurement range (see
Notes 1 and 2).
Use RANGE  and  keys to manually select range.
Or press AUTO RANGE (AUTO annunciator on) to
enable auto range.
5. Turn output on and take readings
from display.
Press ON/OFF OUTPUT key. Red OUTPUT indica-
tor on.
6. Turn output off when finished. Press ON/OFF OUTPUT key. Red OUTPUT indica-
tor off.
Notes
1. If sourcing I, you will be selecting the V measure range. If sourcing V, you will be selecting the I measure
range.
2. The compliance range determines the maximum measurement range that can be selected.