Agilent Technologies B1500A User's Guide download pdf (Page 481)

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101

Agilent B1500 User’s Guide, Edition 7 9-7

If You Have a Problem

When You Perform Measurement

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 valu

e causes the measurement error by the power line noise. You can

set the power line frequency by using the Configuration window of the

EasyEXPERT.

• Use guarding to reduce the leakage current between your probe

r and the

B1500A. Note that long wires cause oscillation because of their large

inductance.

• If some high-power electric machines are operating

around the B1500A, turn off

the machines, then perform the measurements. The machines affect the power

line waveform.

• Shut the lid of test fixture or shield box 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 B1500A; 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 cau

se 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 B1500A. Shift of 1 °C

may shift the measu

rement values. Temperature change causes the following.

• Offset current in the B1500A.

• Thermoelectromotive force in DUT, which causes low cu

rrent.

• Expansion and contraction of cables, which causes noise.

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