Bedienungsanleitung Keithley 2001 (Seite 34 von 476) (Englisch)

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Front Panel Operation

3-2 2001-900-01 Rev. K/ August 2010

WAR NI NG

The power cord supplied with the Model

2001 contains a separate ground wire for

use with grounded outlets. When proper

connections are made, instrument chassis

is connected to power line ground through

the ground wire in the power cord. Failure

to use a grounded outlet may result in per-

sonal injury or death due to electric shock.

3.2.2 Line fuse replacement

A rear panel fuse located below the AC receptacle protects

the power line input of the instrument. If the fuse needs to be

replaced, perform the following steps:

WAR NI NG

Make sure the instrument is disconnected

from the power line and other equipment

before replacing the line fuse.

1. With the power off, place the end of a flat-blade screw-

driver into the rear panel LINE FUSE holder. Push in

gently and rotate the fuse carrier one-quarter turn coun-

terclockwise. Release pressure on the holder and its in-

ternal spring will push the fuse carrier out of the holder.

2. Remove the fuse and replace it with the same type

(0.5A, 250V, slow blow, 5  20mm). The Keithley part

number is FU-71.

CAUTION

Do not use a fuse with a higher current

rating than specified, or instrument

damage may occur. If the instrument re-

peatedly blows fuses, locate and correct

the cause of the trouble before replacing

the fuse. See the optional Model 2001

Repair Manual for troubleshooting in-

formation.

3. Install the new fuse and fuse carrier into the holder by

reversing the above procedure.

3.2.3 Power-up sequence

To turn on the power, simply push in the front panel POWER

switch. Power is on when the switch is in the inner (1)

position. To turn off power, press POWER a second time to

release the switch.

On power-up, the Model 2001 performs self-tests on its

EPROM and RAM, and checksum tests on data stored in

non-volatile memory. (See Table 3-1.) If a failure is detected,

the instrument momentarily displays an error message and

the ERR annunciator turns on. (Messages are listed in Table

3-2.)

NOTE

If a problem develops while the

instrument is under warranty, return it to

Keithley Instruments, Inc. for repair (see

paragraph 1.3.).

If the instrument passes the self-tests, the firmware revision

levels, memory option (if installed), and presently selected

IEEE-488 primary address are displayed. An example of this

display is shown as follows:

Model 2001

Rev. A01 A01 MEM1 IEEE Addr=16

The firmware revision levels (left to right) are for the main

microcontroller and display microcontroller. The revision

level number may be different in your particular unit. If the

MEM1 or MEM2 memory options are not present, that

portion of the bottom line is left blank. The IEEE-488

address is its default value of 16.

Next, if the unit is configured to display the calibration due

date at power-up, the unit shows the following:

Model 2001

Calibration due: mmm/dd/yy

where “mmm” is the month abbreviation, “dd” is the day,

and “yy” is the year. If no calibration date is set, the display

shows that it is due now. (See the Model 2001 Calibration

Manual to set the calibration due date and paragraph 3.12.3

of this manual to set the display option.)

After the power-up sequence, the instrument begins its

normal display, for example:

000.0000 mVDC

Power-up error messages

Error messages that may be displayed during power-up are

summarized in Table 3-2. These are shown when one of the

checksum tests of Table 3-1 fails.

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