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3-8
Measurements and Sourcing Voltage
Ohms measurements
Overview
To measure ohms with the Model 6487, you must set up the voltage source to the desired
range, value, and current limit (see
“Voltage source operation,” page 3-11
), choose an
appropriate current measurement range (or use auto range), and enable the ohms function.
With the ohms function enabled, the Model 6487 calculates the measured resistance from
the voltage source value and the measured current: R = V/I. When setting up the voltage
source, choose as high a voltage value as possible for maximum current, keeping in mind
such factors as the power dissipation and voltage coefficient of the resistance being tested.
NOTE
The ohms measurements can be made using either the DC or alternating voltage
modes. Only the DC mode is used in this manual. See Section 3 of the Model 6487
Reference Manual for information on the alternating voltage mode.
Procedure
WARNING
Always turn off the Model 6487’s voltage source before changing volt-
age source connections to avoid a possible shock hazard.
Perform the following steps to measure resistance:
Step 1. Set up voltage source
Press either of the V-SOURCE adjustment keys, then use a manual RANGE key to set the
voltage source range. Set the voltage and current limit to the desired values. You can skip
the current limit prompt by pressing EXIT after adjusting the voltage.
Step 2. Perform zero correction
To achieve optimum accuracy for high resistance measurements, it is recommended that
you zero correct the picoammeter before enabling the ohms function. To do so, make sure
that zero check and the 2nA range are selected, then press the REL key to perform zero
correction (MON indicator on).
Step 3. Select a manual current range or enable auto range
Use the manual RANGE keys to select a manual current measurement range or press
AUTO to enable auto range. When using manual ranging, choose an appropriate value
based on the voltage source setting and the expected measured resistance: I = V/R.
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