Datasheet > 6517B-3Y-EW-STD

6517B-3Y-EW-STD

更新时间： 2022-02-26 11:42:18

品牌	Logo	应用领域
泰克 - TEKTRONIX		/
页数	文件大小	规格书
12页	921K
描述
6517B Electrometer/High Resistance Meter

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6517B-3Y-EW-STD 数据手册

Datasheet

Current

Stored Current Measurement

Sample’s Background Current

Voltage Source

Current (pA)

–1

–V

The alternating voltage source polarity method eliminates the effects of background currents in materials for making repeatable, accurate high resistance and

resistivity measurements.

consistent, repeatable, and accurate measurements for

a wide variety of materials and components, especially

when used in combination with the 8009 Resistivity

Improved High Resistivity

Measurements

Test Fixture.

Many test applications require measuring high levels

of resistivity (surface or volume) of materials. The

conventional method of making these measurements is to

apply a sufﬁciently large voltage to a sample, measure the

current that ﬂows through the sample, then calculate the

resistance using Ohm’s Law (R=V/I). While high resistance

materials and devices produce very small currents that

are difﬁcult to measure accurately, Keithley electrometers

and picoammeters are used successfully for such

measurements.

Alternating Polarity Method for

High Resistivity Measurements

The 6517B uses the Alternating Polarity Method,

which virtually eliminates the effect of any background

currents in the sample. First and second order drifts

of the background currents are also canceled out. The

Alternating Polarity Method applies a voltage of positive

polarity, then the current is measured after a speciﬁed

delay (Measure Time). Next, the polarity is reversed and

the current measured again, using the same delay. This

process is repeated continuously, and the resistance is

calculated based on a weighted average of the four most

recent current measurements. This method typically

produces a highly repeatable, accurate measurement of

resistance (or resistivity) by the seventh reversal on most

materials (i.e., by discarding the ﬁrst three readings). For

example, a 1mm-thick sample of 10¹⁴Ω-cm material

can be measured with 0.3% repeatability in the 8009

Resistivity Test Fixture, provided the background current

changes less than 200 fA over a 15-second period.

Even with high quality instrumentation, inherent

background currents in the material can make these

measurements difﬁcult to perform accurately. Insulating

materials, polymers, and plastics typically exhibit

background currents due to piezoelectric effects,

capacitive elements charged by static electricity, and

polarization effects. These background currents are

often equal to or greater than the current stimulated by

the applied voltage. In these cases, the result is often

unstable, providing inaccurate resistance or resistivity

readings or even erroneous negative values. Keithley’s

6517B is designed to solve these problems and provides

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