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In this section:

Circuit configurations ................................................................ 4-1

Operating boundaries ............................................................... 4-4

Using NPLCs to adjust speed and accuracy ............................ 4-8

Noise shield............................................................................ 4-10

Safety shield ........................................................................... 4-10

Grounding .............................................................................. 4-11

Floating the Model 2450 ......................................................... 4-12

Guarding ................................................................................ 4-14

Using the Model 2450 in a custom test fixture or system ....... 4-15

Sink operation ........................................................................ 4-17

Battery charge and discharge ................................................ 4-17

Timing information .................................................................. 4-18

Calculating accuracy .............................................................. 4-19

Offset-compensated ohm calculations ................................... 4-20

Power calculations ................................................................. 4-21

High capacitance operation .................................................... 4-21

Filtering measurement data.................................................... 4-22

Reset default values ............................................................... 4-24

Circuit configurations

You can measure current or voltage with either type of source.

The fundamental source-measure configurations for the Model 2450 are described in the following

section.

Source current

When you configure the instrument to source current, the instrument functions as a high-impedance

current source that can limit voltage and can measure current or voltage.

If you set the instrument to 2-wire sense, voltage is measured at the FORCE HI and FORCE LO

terminals of the instrument. If you set the instrument to 4-wire sense, voltage is measured directly at

the device under test using the sense terminals. Four-wire sense eliminates any voltage drops that

may be in the test leads or in the connections between the instrument and the device under test.

Section 4

Source-measure considerations

Keithley 2450 User Manual

Other manuals for Keithley 2450