Agilent Technologies 3458A Manual do Utilizador descarregar pdf (Página 2)

A User’s Guide to Agilent 3458A Front Panel Operation

Example 1: Making a measurement with any function after turning

on the Agilent 3458A. The ACV function serves as a typical example

of the immediate execute keys found in the Function/Range key

group. Connect the appropriate signal to the input terminals and

press the keys shown.

Example 2: Making a precision Vdc measurement on the 10 V range.

Example 3: Making a very precise Vac measurement using the Syn-

chronous ACV measurement function. (At power-on, the Agilent

3458A is set to the generally more useful Analog ACV measurement

function if you select ACV, but you should use Synchronous ACV for

very precise measurements of periodic waveforms.)

Command Key Group Key Sequence

ACV Function/Range

(Any other function key in the Function/Range Key Group acts

similarly; the Agilent 3458A changes function, automatically

ranges, and begins measurements.)

RESET Function/Range

Reset

(RESET returns the Agilent 3458A to the powered-on state.)

Command Key Group Key Sequence

RESET Function/Range

Reset

DCV Function/Range

10 V Range Function/Range

(The and keys are

pressed until the desired range is

displayed: in this case, XX.XXXXX V DC (X is any number).

Leading zeros are always displayed for easy range identifica-

tion.)

NPLC 100 Menu

Numeric/User

(Measurement will take about 3 seconds.)

NDIG 8 Function/Range

Numeric/User

(Sets the display to 8 1/2 digits.)

ACV

ACVACV

ACV

(blue)

(blue)(blue)

(blue)

(blue)(blue)

(blue)

DCV

DCVDCV

DCV

NPLC

NPLCNPLC

NPLC

1 0 0

Enter

(blue)

(blue)(blue)

(blue)

Enter

The shifted Menu Keys allow alphabetic access to all

Agilent 3458A commands and command parameters. The com-

mands and command parameters are scrolled from A to Z by using

the Menu Scroll keys ( and ) found in the Function/Range

keys. Command parameters are accessed by using the Display/

Window keys and , also found in the Function/Range

keys, after the command is located.

Command Key Group Key Sequence

RESET Function/Range

Reset

ACV Function/Range

SETACV SYNC Function/Range

Menu S

Function/Range

Numeric/User

(The MORE INFO annunciator should be illuminated. The MORE

INFO annunciator indicates that some part of the measurement

configuration is in a non-standard state. To view this information

press . Your display should show SETACV SYNC. Now press

again; the display is returned to the measurement state.)

RES .002 Function/Range

Menu R

Function/Range

Numeric/User

(The RES command sets the % resolution of the measurement. A

function change causes RES to default to RES .01 (0.01%) with

reading rate of 1 per 3 s.)

LFILTER ON Function/Range

Menu L

Function/Range

Numeric/User

(Suggested for inputs with frequencies below 50kHz.)

(blue)

(blue)(blue)

(blue)

ACV

ACVACV

ACV

(blue)

(blue)(blue)

(blue)

Enter

(blue)

(blue)(blue)

(blue)

. 0 0 2

Enter

(blue)

(blue)(blue)

(blue)

Enter

The Agilent 3458A Auto-Calibration (ACAL) function removes measurement

errors caused by component temperature and time drift. For maximum

accuracy, ACAL should be performed every 24 hours. For example, addi-

tional Vdc volts gain errors due to temperature changes are reduced from

1 ppm/

°C to 0.15 ppm/°C (over 6:1) using ACAL. In ACV volts, additional

gain error due to temperature changes are reduced from 30 ppm/

°C to less

than 1 ppm/

°C (over 30:1) using ACAL. The time to perform a complete

ACAL is about 12 minutes. ACAL ACV takes about 1 minute, ACAL DCV

takes about 2 minutes, and ACAL OHM takes about 9 minutes. For monitor-

ing temperature changes, the Agilent 3458A provides the TEMP? command

(found in the command Menu) to measure the internal instrument tempera-

ture. Refer to the User’s Guide for more details. ACAL keystroke sequence.

Store and Recall Instrument Setups

Store and Recall can significantly reduce the number of keystrokes neces-

sary for a complex configuration. Simply pressing , pressing a Numeric

Key X (0-127) and pressing , stores the state of the Agilent 3458A as a

state to recall by pressing X. Shipped with the Agilent 3458A is a small

plastic overlay that fits on key 5 to document your User Key and Stored

State definitions. Use Example 3 and perform the following:

User Definable Keys

In addition to the State Store and Recall commands, you can also define any

of the User keys, F0-F9, in the Numeric/User Key Group to be any string of

commands.

Let's use Example 3 one more time to show how this feature works.

Command Recall Buffer Operation

The command recall buffer recalls previously entered commands. If you

have performed the sequence in the User Definable Keys you can expect to

have the results listed below.

The MENU Command

To access the commands alphabetically, you use the Menu Keys. As the

Agilent 3458A is shipped, only the most commonly used commands are

available in this "SHORT" menu. To access all the commands, you have to use

the Menu Key with the "FULL' parameter.

Configuration for Highly Accurate Measurements

with the Agilent 3458A

(You should perform an ACAL every 24 hours for the appropriate function after the

Agilent 3458A has been powered-on and in a stable temperature environment for a minimum

of four hours.)

Function Comment Key Sequence

____________________________DCV____________________________

RESET Power-on state (VDC)

Reset

NPLC 200

Integration Time

(1)

NDIG 8 8 1/2 Digits

____________________________ACV____________________________

RESET Power-on state

Reset

ACV Function Vac

SETACV SYNC Synchronous AC

RES .002 Max AC Reading Res.

LFILTER ON

Internal LP Filter

(2)

__________________________OHMS____________________________

RESET Power-on state

Reset

OHMF Function Four-Wire Ohms

OHMF

OCOMP ON

For R <= 100 kOhms

(3)

DELAY 1

Adds 1 s delay

(4)

NPLC 200

Integration Time

1. Longer integration times reduce measurement noise and increase measurement resolution.

2. Recommended for frequencies less than 50kHz.

3. OCOMP ON turns on the offset compensation feature of the Agilent 3458A. OCOMP ON min-

imizes the effect of any thermally generated offset voltage from creating errors in resistance

measurements.

4. Adds 1 s settling delay to reduce effects of dielectric absorption errors of cabling and the

resistor under test

Cal

CalCal

Cal

Auto

AutoAuto

Auto

, 3 4 5 8

Enter

(blue)

(blue)(blue)

(blue)

NPLC

NPLCNPLC

NPLC 2 0 0

Enter

(blue)

(blue)(blue)

(blue)

Enter

(blue)

(blue)(blue)

(blue)

ACV

ACVACV

ACV

(blue)

(blue)(blue)

(blue)

Enter

(blue)

(blue)(blue)

(blue)

. 0 0 2

Enter

(blue)

(blue)(blue)

(blue)

Enter

(blue)

(blue)(blue)

(blue)

(blue)(blue)

(blue)

Comp

CompComp

Comp

Offset

OffsetOffset

Offset

Enter

(blue)

(blue)(blue)

(blue)

Enter

NPLC

NPLCNPLC

NPLC 2 0 0

Enter

Command Key Group Key Sequence

SSTATE 1 Menu

Numeric/User

(Stores the Agilent 3458A’s state in stored state 1.)

RESET Function/Range

Reset

(RESET returns the Agilent 3458A to the powered-on state.)

RSTATE 1 Menu

Numeric/User

(Returns the Agilent 3458A to stored state 1.)

Command Key Sequence

DEFKEY DEFAULT

Def Key

(Clears all previously defined User Definable keys.)

DEFKEY F0,

(Ready to accept commands.)

FUNC ACV

(three times)

(four times)

;

(The delimiter used to separate commands is " ; ".

The delimiter used to separate parameters is " , ".)

SETACV SYNC

;

RES .002

;

LFILTER ON

DEFKEY F1,

MATH NULL

(four times)

(eight times)

(MATH NULL displays the difference between the first and subse-

quent measurements.)

Now Use It!

(Note the MATH annunciator is turned on.)

Command Key Group Key Sequence

RECALL Function/Range

Numeric/User Recall

(MATH NULL should appear in the Display.)

Command Key Group Key Sequence

MENU FULL Function/Range

Numeric/User Menu

Function/Range

Numeric/User

State

StateState

State

Store

StoreStore

Store

Enter

State

StateState

State

Recall

RecallRecall

Recall

State

StateState

State

Store

StoreStore

Store

Enter

(blue)

(blue)(blue)

(blue)

State

StateState

State

Recall

RecallRecall

Recall

Enter

(blue)

(blue)(blue)

(blue)

Enter

(blue)

(blue)(blue)

(blue)

(blue)(blue)

(blue)

(blue)(blue)

(blue) (blue)

(blue)(blue)

(blue)

(blue)(blue)

(blue)

. 0 0 2

(blue)

(blue)(blue)

(blue)

(blue)(blue)

(blue)

Enter

(blue)

(blue)(blue)

(blue)

Enter

(blue)

(blue)(blue)

(blue)

Enter

(blue)

(blue)(blue)

(blue)

Enter

(blue)

(blue)(blue)

(blue)

(blue)(blue)

(blue)

Enter

Reading/Menu Display

• Alphanumeric Reading, Units, and Functions

• Command Menu

• Status Annunciators

• MORE INFO (additional information viewable with )

Function/Range Keys

• Immediate Execute Function Keys

• MAnual Range and Menu

•Display Window

• GPIB Bus Address

Menu Keys

• Commonly Used Commands

• Shifted Alphabetic Entry Points

into Command Menu

Numeric/User Keys

• 10-Key Pad for Numeric Entry

• Deep RECALL buffer of Executed Commands

• MENU type selection

• 10 Battery Backed Up User Definable Keys F0-F9

*03458-90007*

03458-90007

A 5-Minute Tutorial of Front Panel Operation

Auto-Calibration (ACAL)

Short Cuts

Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

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*03458-90007* 2

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