Keithley 182-M Manual de usuario

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Model 182 Sensitive Digital Voltmeter

Quick Reference Guide

A GREATER MEASURE OF CONFIDENCE

INTRODUCTION

This quick reference guide includes summary

information on front panel operation and IEEE-488

operationfortheModel182SensitiveDigitalVoltmeter.

Fordetailed Model 182 information,consult the Model

182 Instruction Manual.

Cleveland, Ohio, U.S.A.

Document Number: 182-903-01 Rev. B

TABLE OF CONTENTS

SAFETY PRECAUTIONS ....................................... 3

CONTROL SUMMARY ........................................... 8

TEST CONNECTIONS ......................................... 14

DEVICE DEPENDENT COMMANDS ...................15

DATA FORMATS ................................................... 23

SRQ MASK AND SERIAL POLL BYTE................. 25

ALTERNATE OUTPUT WORD FORMATS ...........26

SAFETY PRECAUTIONS

The following safety precautions should be observed

before using this product and any associated instru-

mentation. Although some instruments and accesso-

ries would normally be used with non-hazardous volt-

ages,thereare situations where hazardous conditions

may be present.

This product is intended for use by qualified person-

nelwho recognize shock hazards andare familiar with

the safety precautions required to avoid possible in-

jury. Read the operating information carefully before

using the product.

The types of product users are:

Responsible body is the individual or group respon-

sible for the use and maintenance of equipment, for

ensuring that the equipment is operated within its

specifications and operating limits, and for ensuring

that operators are adequately trained.

Operators use the product for its intended function.

They must be trained in electrical safety procedures

and proper use of the instrument. They must be pro-

tected from electric shock and contact with hazard-

ous live circuits.

Maintenancepersonnelperformroutineprocedureson

the product to keep it operating, for example, setting

the line voltage or replacing consumable materials.

Maintenanceproceduresare described in themanual.

The procedures explicitly state if the operator may

perform them. Otherwise, they should be performed

only by service personnel.

Service personnel are trained to work on live circuits,

andperform safe installations andrepairs of products.

Only properly trained service personnel may perform

installation and service procedures.

Keithley products are designed for use with electrical

signals that are rated Installation Category I and In-

stallationCategory II, as describedin the International

Electrotechnical Commission (IEC) Standard IEC

60664. Most measurement, control, and data I/O sig-

nals are Installation Category I and must not be di-

rectlyconnectedtomainsvoltageortovoltagesources

withhightransientover-voltages. Installation Category

IIconnectionsrequireprotectionforhightransientover-

voltages often associated with local AC mains con-

nections. The user should assume all measurement,

control, and data I/O connections are for connection

to Category I sources unless otherwise marked or

described in the Manual.

Exercise extreme caution when a shock hazard is

present. Lethal voltage may be present on cable con-

nector jacks or test fixtures. The American National

Standards Institute (ANSI) states that a shock hazard

exists when voltage levels greater than 30V RMS,

42.4Vpeak,or60VDCarepresent.Agoodsafetyprac-

tice is to expect that hazardous voltage is present in

any unknown circuit before measuring.

Users of this product must be protected from electric

shock at all times. The responsible body must ensure

thatusers are prevented accessand/orinsulated from

every connection point. In some cases, connections

must be exposed to potential human contact. Product

users in these circumstances must be trained to pro-

tect themselves from the risk of electric shock. If the

circuit is capable of operating at or above 1000 volts,

no conductive part of the circuit may be exposed.

Do not connect switching cards directly to unlimited

power circuits. They are intended to be used with im-

pedance limited sources. NEVER connect switching

cards directly toAC mains. When connecting sources

to switching cards, install protective devices to limit

fault current and voltage to the card.

Before operating an instrument, make sure the line

cord is connected to a properly grounded power re-

ceptacle. Inspect the connecting cables, test leads,

and jumpers for possible wear, cracks, or breaks be-

fore each use.

When installing equipment where access to the main

power cord is restricted, such as rack mounting, a

separate main input power disconnect device must

be provided, in close proximity to the equipment and

within easy reach of the operator.

For maximum safety, do not touch the product, test

cables, or any other instruments while power is ap-

plied to the circuit under test.ALWAYS remove power

fromthe entire testsystem and discharge anycapaci-

tors before: connecting or disconnecting cables or

jumpers, installing or removing switching cards, or

making internal changes, such as installing or remov-

ing jumpers.

Do not touch any object that could provide a current

path to the common side of the circuit under test or

power line (earth) ground. Always make measure-

ments with dry hands while standing on a dry, insu-

lated surface capable of withstanding the voltage be-

ing measured.

The instrument and accessories must be used in ac-

cordancewith its specifications andoperating instruc-

tions or the safety of the equipment may be impaired.

Do not exceed the maximum signal levels of the in-

struments and accessories, as defined in the specifi-

cations and operating information, and as shown on

theinstrument or test fixturepanels, or switching card.

When fuses are used in a product, replace with same

type and rating for continued protection against fire

hazard.

Chassisconnections must only be usedas shield con-

nections for measuring circuits, NOT as safety earth

ground connections.

If you are using a test fixture, keep the lid closed while

power is applied to the device under test. Safe opera-

tion requires the use of a lid interlock.

If a screw is present, connect it to safety earth ground

using the wire recommended in the user documenta-

tion.

The symbol on an instrument indicates that the user

should refer to the operating instructions located in

the manual.

Thesymbol on aninstrument shows that it can source

or measure 1000 volts or more, including the com-

bined effect of normal and common mode voltages.

Use standard safety precautions to avoid personal

contact with these voltages.

TheWARNING heading in amanual explains dangers

that might result in personal injury or death. Always

read the associated information very carefully before

performing the indicated procedure.

The CAUTION heading in a manual explains hazards

that could damage the instrument. Such damage may

invalidate the warranty.

Instrumentation and accessories shall not be con-

nected to humans.

Before performing any maintenance, disconnect the

line cord and all test cables.

To maintain protection from electric shock and fire,

replacement components in mains circuits, including

thepowertransformer, test leads, and input jacks, must

be purchased from Keithley Instruments. Standard

fuses, with applicable national safety approvals, may

be used if the rating and type are the same. Other

components that are not safety related may be pur-

chasedfromother suppliers as long as theyareequiva-

lenttothe original component. (Note that selectedparts

shouldbepurchased only through Keithley Instruments

to maintain accuracy and functionality of the product.)

If you are unsure about the applicability of a replace-

mentcomponent, call aKeithley Instruments officefor

information.

Tocleananinstrument,usea damp cloth or mild, water

based cleaner. Clean the exterior of the instrument

only. Do not apply cleaner directly to the instrument or

allow liquids to enter or spill on the instrument. Prod-

uctsthatconsistofacircuitboardwithnocase or chas-

sis (e.g., data acquisition board for installation into a

computer) should never require cleaning if handled

according to instructions. If the board becomes con-

taminated and operation is affected, the board should

be returned to the factory for proper cleaning/servicing.

CONTROL SUMMARY

RANGE

Use UP and DOWN to manually select desired mea-

surement range; 3mV, 30mV, 300mV, 3V, or 30V.

Present range is displayed on status line.

PressAUTOto turn auto-range on or off. Unit upranges

atoverflowpoint (±3,029,999counts)anddownranges

at 9.33% of full range when AUTO is enabled.

Use FILTER to enable or disable both digital and ana-

log filters simultaneously (actual filter configuration or

response depends on MENU FILTER selections).

REL

Press REL READING to store current reading as

baseline. Subsequent readings will be the difference

between the applied signal and the stored baseline.

Press REL OUTPUT to store current analog output

value as analog output baseline. Analog output value

will be the difference between the normal, non-relative

output value and the stored analog output baseline.

TRIG

Press SETUP to program TRIGGER MODE, TRIG-

GER SOURCE, TRIGGER DELAY, AND TRIGGER

INTERVAL.

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