Disable background measurement for this instruction
• By selecting this option, the tester will take the measurement from the last instruction and apply it
to the current instruction. This will lower the amount of time spent on testing. In the case that no
background measurement has been taken previously, it is assumed that the background current is
equal to zero. If this option is not selected, the instruction will perform a background measurement
for each instruction performed, increasing test time.
Isolate add on boxes (lower system capacitance and leakage current)
• By selecting this option, the system will only interface with the main tester unit.
Hipot & Measure Resistance
Hipot and Measure Resistance performs an isolation test similar to the Hipot and Measure Current
instruction described above. However rather than specifying the isolation in terms of leakage current, you
to specify the test limits in terms of resistance.
For operator safety carefully set the Compliance Current and other test settings to minimize the electrical
energy in the test. See safety precautions at the beginning of this section. This custom instruction must
be preceded by both an Attach 2-wire and an Attach 4-wire test instruction.
See also NPLC and Average on page 32.
Source & Measure 2W Current
Source & Measure Current allows you to specify a precision source voltage, which will be applied to one
point, the Hi Point. When the test instruction is executed the specified Lo Point will be pulled to ground.
You can enable low and high current limits for leakage current between the Hi and Lo points. Current flow
outside limits will cause the test instruction to fail. Note that no other test points are sourced or sunk when
this test instruction is executed.
For operator safety carefully set the Compliance Current and other test settings to minimize the electrical
energy in the test. See safety precautions at the beginning of this section. This custom instruction must
be preceded by an Attach 2-wire test instruction.
An example where this custom test instruction could be useful would be to test transorb leakage.
Transorbs are electrical components that are used to protect sensitive electronics from voltage spikes.
When a particular threshold voltage is reached the transorb begins to conduct clamping the voltage at the
transorb voltage. To test a 10 volt transorb, you might use Source & Measure 2W Current to apply a 9 volt
voltage, and test for minimal current flow. You could then use a Source & Measure 2W Voltage instruction
to apply a specified current with sufficient compliance voltage (say 12 volts), to test threshold voltage.
See also NPLC and Average on page 32.
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