Bedienungsanleitung Keithley 2001 (Seite 75 von 476) (Englisch)

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Front Panel Operation

2001-900-01 Rev. K/ August 2010 3-43

When AC+DC coupling is selected, the blocking capacitor is

removed. Subsequent frequency measurements will reflect

both the AC and DC components of the signal.

You can set the frequency coupling as follows:

1. From the CONFIGURE FREQUENCY menu, select

COUPLING and press ENTER. The following menu is

displayed:

SET FREQ COUPLING

AC AC+DC

2. Highlight the desired coupling and press ENTER.

Multiple displays

There are two multiple displays just for the frequency

function:

• Period calculation

• Trigger level

The multiple display showing the period of the waveform is

calculated from the frequency measurement and, as such, is

only available when the frequency does not equal 0Hz. It is

also unavailable when math is enabled.

The trigger level multiple display is the same message that is

displayed when the trigger level is changed, but it is a perma-

nent display.

3.4.5 Temperature

The Model 2001 measures temperature with two different

sensor types: RTDs and thermocouples. With RTDs, the

Model 2001 can measure temperature between -200°C and

+630°C. RTDs can be connected to the input terminals or the

optional Model 2001-SCAN scanner card.

With thermocouples connected to an external thermocouple

card, such as a Model 7057A or 7402 in a Model 7001

Switch System, the instrument measures temperature over a

range that is dependent on the thermocouple type. (Refer to

the Specifications.

Temperature measurements

Assuming “bench reset” conditions (see paragraph 3.12.1),

the basic procedure to measure temperature with a type

PT385 4-wire RTD (the default sensor) is as follows:

1. Connect the RTD sensor to the Model 2001 as shown in

Figure 3-17. You can use banana plugs (with the front or

rear inputs), or the optional Model 8680 RTD Probe

Adapter (with the front inputs). Place the INPUTS but-

ton in the appropriate position. RTDs can also be con-

nected to the optional Model 2001-SCAN scanner card.

(See the Model 2001-SCAN manual.)

2. Select the TEMP function.

CAUTION

Do not exceed 1100V peak between IN-

PUT HI and LO, or 350V peak between

SENSE 4 WIRE HI and LO, or instru-

ment damage may occur.

3. Observe the display. If the “Overflow” message is

shown, the RTD might not be connected properly.

4. Take a reading from the display.

The procedure for measuring temperature with 3-wire and 2-

wire RTDs is similar. (See Figure 3-18 and Figure 3-19 for

connection diagrams.) Be sure that the temperature function

is configured for the correct sensor type. (Use the 4-WIRE-

RTD selection for a 3-wire RTD sensor.)

To measure temperature with thermocouples, you need to

connect the thermocouples to a suitable external scanner

card, such as the Keithley Model 7057A or 7402. These

cards must be inserted into a Model 705 or 706 Scanner or

the Model 7001 Switch System, as shown in Figure 3-20.

The thermocouple cards use Channel 1 as the reference

junction, and must be configured on the Model 2001 for

voltage reference and offset.

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