Keithley 6517B/E Digital-Multimeter, DMM, 6517B/E Ficha De Dados
Códigos do produto
6517B/E
LO
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www.keithley.com
1.888.KEITHLEY
(U.S. only)
A Greater Measure of Confidence
•
Measures resistances up
to 10
16
W
•
1fa–20ma current measurement
range
•
<20µV burden voltage on
lowest current ranges
•
200T
W input impedance
•
<3fa bias current
•
up to 425 rdgs/s
•
0.75fa p-p noise
•
built-in ±1kV voltage source
•
unique voltage reversal
method for high resistance
measurements
•
optional plug-in scanner cards
Keithley’s 5½-digit Model 6517B Electrometer/High
Resistance Meter offers accuracy and sensitivity speci-
fications unmatched by any other meter of this type . It
also offers a variety of features that simplify measur ing
high resistances and the resistivity of insulating materi-
als . With reading rates of up to 425 read ings/second, the
Model 6517B is also significantly faster than competitive
electrometers, so it offers a quick, easy way to measure
low-level currents .
Exceptional Performance specifications
The half-rack-sized Model 6517B has a special low current
The half-rack-sized Model 6517B has a special low current
input amplifier with an input bias current of <3fA with
just 0 .75fA p-p (peak-to-peak) noise and <20µV burden
voltage on the lowest range . The input impedance for
voltage and resistance measurements is 200T
W for near-
ideal circuit loading . These speci fi ca tions ensure the accuracy and sensitivity needed for accurate
low current and high imped ance volt age, resistance, and charge measure ments in areas of re search
such as physics, optics, nanotechnology, and materials science . A built-in ±1kV voltage source with
sweep capability simplifies performing leak age, break down, and resis tance testing, as well as volume
(
W-cm) and surface resistivity (W/square) mea sure ments on insulating materials .
Wide Measurement ranges
The Model 6517B offers full autoranging over the full span of ranges on current, resistance, voltage,
The Model 6517B offers full autoranging over the full span of ranges on current, resistance, voltage,
and charge mea sure ments:
• Current measurements from 1fA to 20mA
• Voltage measurements from 10µV to 200V
• Resistance measurements from 50
• Current measurements from 1fA to 20mA
• Voltage measurements from 10µV to 200V
• Resistance measurements from 50
W to 10
16
W
• Charge measurements from 10fC to 2µC
Improved High resistivity Measurements
Many test applications require measuring high levels of resistivity (surface or volume) of materials .
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’s electrometers and picoammeters are used successfully for
such measurements .
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 back-
ground 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 Model 6517B is designed
to solve these problems and provides consistent, repeatable, and accurate measurements
for a wide variety of materials and components, especially when used in combination
with the Model 8009 Resistivity Test Fixture .
alternating Polarity Method
The Model 6517B uses the Alternating Polarity method, which virtually eliminates the
The Model 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
6517b
Electrometer/High Resistance Meter
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