Keithley Series 2600 User Manual

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2-3

SECTION 2

Two-terminal Device Tests

2.3.5 Typical Program 1 Results

The actual voltage coefﬁcient you obtain using the program will,

of course, depend on the resistor being tested. The typical voltage

coefﬁcient obtained for a 10GW resistor (Keithley part number

R-319-10G) was about 8ppm/V (0.008%/V).

2.3.6 Program 1 Description

At the start of the program, the instrument is reset to default con-

ditions, and the error queue and data storage buffers are cleared.

The following conﬁguration is then applied before the data col-

lection begins:

Source V, DC mode•

Local sense•

100mA compliance, autorange measure•

1NPLC line cycle integration•

v1src:

• 100V

v2src:

• 200V

The instrument then sources

v1src

, checks the source for com-

pliance in the function named

Check _ Comp()

, and performs a

measurement of the current if compliance is false. The source then

applies

v2src

and performs a second current measurement.

The function

Calc _ Val()

then performs the calculation of the

voltage coefﬁcient based on the programmed source values and

the measured current values as described in Section 2.3.2, Voltage

Coefﬁcient Calculations.

The instrument output is then turned off and the function

Print _ Data()

is run to print the data to the TSB window.

Note: If the compliance is true, the instrument will abort the pro-

gram and print a warning to the TSB window. Check the DUT

and cabling to make sure everything is connected correctly and

re-run the test.

2.4 Capacitor Leakage Test

One important parameter associated with capacitors is leakage

current. Once the leakage current is known, the insulation resist-

ance can be easily calculated. The amount of leakage current in

a capacitor depends both on the type of dielectric as well as the

applied voltage. With a test voltage of 100V, for example, ceramic

dielectric capacitors have typical leakage currents in the nanoamp

to picoamp range, while polystyrene and polyester dielectric

capacitors exhibit a much lower leakage current—typically in the

femtoamp (10

–15

A) range

2.4.1 Test Conﬁguration

Figure 2-3 shows the test conﬁguration for the capacitor leakage

test. The instrument sources the test voltage across the capacitor,

and it measures the resulting leakage current through the device.

The resistor, R, is included for current limiting, and it also helps

to reduce noise. A typical value for R is 1MW, although that value

can be decreased for larger capacitor values. Note, however, that

values less than 10kW are not recommended.

2.4.2 Leakage Resistance Calculations

Once the leakage current is known, the leakage resistance can

easily be calculated from the applied voltage and leakage current

value as follows:

R = V/I

Resistor R required to

limit current and

reduce noise.

Typical value: 1MΩ

Minimum value: 10kΩ

Series 2600

System

SourceMeter

Channel A

Source V,

Measure I

Test

Fixture

Capacitor

Under

Test

Output HI I

LKG

Output LO

Figure 2-3. Test conﬁguration for capacitor leakage test

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Keithley Series 2600 Specifications

General

Model	Series 2600
Measurement Functions	Voltage, Current, Resistance, Power
Resolution	Up to 6.5 digits
Current Source Range	Up to 10A
Communication Interfaces	GPIB, USB
Applications	Semiconductor testing
Category	Source Measure Unit (SMU)
Channels	Single or Dual Channel (varies by model)