Bedienungsanleitung Keithley 2001 (Seite 71 von 476) (Englisch)

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Front Panel Operation

2001-900-01 Rev. K/ August 2010 3-39

RESOLUTION

The RESOLUTION parameter sets the display resolution. It

is discussed in paragraph 3.4.1, DC and AC voltage. Only

the differences for 2 and 4 are noted here.

The available resolution on all resistance functions and types

is 3.5 digits to 7.5 digits. If the 2 or 4 resolution is AUTO,

refer to Table 3-20 for the resolution associated with the

integration time.

OFFSETCOMP

Offset compensation is used to compensate for voltage

potentials, such as thermal offsets, across the device under

test. This feature eliminates errors due to a low level external

voltage source configured in series with the unknown

resistor. Offsets up to ±0.2V on the 20 and 200 ranges,

and from -0.2V to +2V on the 2k and 20k ranges can be

corrected with offset compensation. Offset compensation is

available for 2- and 4-wire resistance measurements.

During offset compensated resistance measurements, the

Model 2001 performs the following steps for each A/D

conversion:

1. Makes a normal resistance measurement of the device.

In general, this consists of sourcing a current through the

device, and measuring the voltage drop across the

device.

2. Turns off the internal current source and again measures

the voltage drop across the device. This is the voltage

caused by an external device.

3. Calculates and displays the corrected resistance value.

Offset compensation not only corrects for small error

voltages in the measurement circuit, but it also compensates

for thermal voltages generated within the Model 2001. In

normal mode ohms, these thermal EMF offsets are

accounted for during calibration.

You can enable/disable offset compensation as follows:

1. From the CONFIGURE OHMS-2W or CONFIGURE

OHMS-4W menu, select OFFSETCOMP and press EN-

TER. The following menu is displayed:

SET OFFSET COMP

ON OFF

2. Highlight the desired selection and press ENTER.

Offset compensated readings are indicated by “OCmp” to

the right of the reading.

Note that the offset compensation settings of the ohms

functions are discrete. Thus, enabling offset compensation in

2-wire ohms has no effect on 4-wire ohms.

MAXAUTORANGE

By setting an upper limit on autoranging, you can prevent

changes to ranges that you do not want to use. This speeds up

the reading rate while still using auto-ranging. You can

program the MAXAUTORANGE as follows:

1. From the CONFIGURE OHMS-2W or CONFIGURE

OHMS-4W menu, select MAXAUTORANGE and

press ENTER. One of the following menus is displayed:

SET 2 MAX AUTORANGE

1G 200M 20M 2M 200k 20k

SET 4 MAX AUTORANGE

200k 20k 2k

q~ÄäÉ=PJOM



2 and



4 auto resolution

0.01 to <0.02 PLC

0.02 to <0.20 PLC

0.20 to <2.00 PLC

2.00 to 10.00 PLC

4.5d

5.5d

6.5d

7.5d

Note: If the resolution is AUTO and the integration time

SET-BY-RSLN, the resolution will be 6.5 digits and the

integration time 1.0 PLC.

q~ÄäÉ=PJNV



2 and



4 auto filter

2-wire resistance On Advanced 10 1.0% Moving

4-wire resistance On Advanced 10 1.0% Moving

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