Keysight E5260/E5270 User’s Guide, Edition 6 7-7
If You Have a Problem
When You Make a Measurement
If Noise Affects the Measured Values
When you measure low current of a DUT, the measured values may not be stable.
To solve this problem:
• Set the power line frequency correctly. The value affects the integration time. So
the wrong value causes the measurement error by the power line noise.
• Use guarding to reduce the leakage current between your prober and the
E5260/E5270. Note that long wires cause oscillation because of their large
inductance.
• If some high-power electric machines are operating around the E5260/E5270,
turn off the machines, then perform the measurements. The machines affect the
power line waveform.
• Shut the test fixture cover or the shield box access door to prevent effects of
light.
• If these are vibrations due to nearby machines or due to air flow, put cushioning
material under prober, cable, and the E5260/E5270; install stabilizer on the
prober; and make the cables stable by taping.
• Wait several minutes after connecting cables or moving probe needles. Because
these operations cause electromotive force.
• If you use only Force terminal and triaxial cables, connect an open cap to Sense
terminal.
• Keep constant temperature in the room when you use the E5260/E5270. Shift of
1 °C may shift the measurement values. Temperature change causes the
following.
• Offset current in the E5260/E5270.
• Thermoelectromotive force in DUT, which causes low current.
• Expansion and contraction of cables, which causes noise.
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