4-18 Basic Operation Series 2600 System SourceMeters Reference Manual
2600S-901-01 Rev. A / May 2006 Return to Section 4 topics
Ohms measurements
Ohms calculations
Resistance readings are calculated from the sourced current and measured
voltage as follows:
R = V/I
Where: R is the calculated resistance
V is the measured voltage
I is the sourced current
Ohms ranging
The front panel ohms function does not use ranging. The unit formats a calculated
V/I reading to best fit the display. There may be leading zeros if the ohms reading
is very small (<1mΩ).
Basic ohms measurement procedure
Perform the following steps to perform ohms measurements. The following
procedure assumes that the SourceMeter is already connected to the DUT as
explained in
Section 3.
WARNING Hazardous voltages may be present on the output and guard
terminals. To prevent electrical shock that could cause injury
or death, NEVER make or break connections to the Series 2600
while the output is on. Power off the equipment from the front
panel or disconnect the main power cord from the rear of the
SourceMeter before handling cables connected to the outputs.
Putting the equipment into standby does not guarantee the
outputs are not powered if a hardware or software fault occurs.
1. For the Model 2602/2612, press the DISPLAY key to select the single-
channel display mode.
2. Press SRC to select the current source function, then set the output current
to the desired value based on the expected resistance. See Step 1 of
“
Front panel source-measure procedure” earlier in this section.
3. Press the LIMIT key. Set the voltage limit high enough for the expected
voltage across the resistance to be measured based on both the resistance
value and programmed source current. See Step 2 of “
Front panel source-
measure procedure” earlier in this seciton
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