Section 4: Basic measurements Model 6517B Electrometer Reference Manual
4-18 6517B-901-01 Rev. C / August 2015
Resistance and resistivity measurements
The Model 6517B can make resistance measurements and resistivity measurements (surface and
volume). High resistance measurements (above 1 MΩ) may exhibit problematic background currents
and can be improved using the alternating polarity test sequence.
Auto V-source
The Model 6517B has an auto V-source mode for resistance and resistivity measurements. With
AUTO V-source selected, the Model 6517B automatically sets the V-source to an optimum test
voltage level, either 40 V or 400 V. The selected test voltage and current measurement range
depends on which ohms measurement range is being used (see the table in Ohms ranges (on page
4-19)). With AUTO V-source selected, the Model 6517B displays the ohms measurement range and
the V-source value. Note that with AUTO V-source selected, you are not able to manually adjust the
V-source or change the V-source range when in the ohms function.
If AUTO V-source ohms is on, the voltage limit of the V-source is < 400 V, an ohms range that
requires 400 V is selected, an error message occurs, and the voltage source is turned off.
The published specifications for ohms only apply for the specified AUTO V-source test voltages. If
using the MANUAL V-source setting, you must add the V-source errors to the amps measurement
range errors to determine the total ohms errors.
With the MANUAL V-source setting selected, you can set the V-source to any value and change the
V-source range while in the ohms function. The Model 6517B displays the amps range that is being
used for the measurement and the V-source value.
A hazardous voltage (400 V) may automatically be set for the ohms function when AUTO V-
source is selected. The "Ohms reading ranges and AUTOV-source" table identifies the ohms
ranges that use 400 V.
The V-source setting (AUTO or MANUAL) is selected from the VSOURCE item of CONFIGURE
OHMS menu.
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