GW Instek GOM-804 Manuel utilisateur

D.C. Milli-Ohm Meter

GOM-804 & GOM-805

USER MANUAL

GW INSTEK PART NO. 82OM-80500E01

ISO-9001 CERTIFIED MANUFACTURER

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Table of Contents

SAFETY INSTRUCTIONS ....................................................5

Safety Symbols ....................................................5

Safety Guidelines ................................................6

GETTING STARTED ............................................................9

GOM-804/805 Characteristics........................... 10

Key Features ...................................................... 13

Model Lineup .................................................... 14

Front Panel Overview ........................................ 15

TFT-LCD Overview ............................................ 19

Rear Panel Overview ......................................... 21

Set Up ............................................................... 23

MEASUREMENT...............................................................27

Resistance Measurement .................................. 29

Compare Function............................................. 41

Binning Function............................................... 46

Temperature Measurement ............................... 50

Temperature Compensation .............................. 52

Temperature Conversion ................................... 56

Measurement Settings ...................................... 60

System Settings ................................................ 69

HANDLER/SCAN INTERFACE ..........................................77

Handler Overview ............................................. 78

Pin Definitions for the Handler Interface .......... 80

Scan Overview................................................... 82

Configure Interface ........................................... 90

SAVE/RECALL...................................................................99

COMMAND OVERVIEW .................................................102

Command Syntax ............................................ 102

Command List................................................. 105

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GOM-804 & GOM-805 User Manual

BINNing Commands ....................................... 108

Calculate Commands ...................................... 113

Memory Commands ........................................ 120

Sense Commands............................................ 122

Source Commands .......................................... 126

Status Commands ........................................... 127

System Commands.......................................... 128

Temperature Commands ................................. 133

Trigger Commands .......................................... 138

Userdefine Commands .................................... 141

IEEE 488.2 Common Commands..................... 143

Status system .................................................. 146

FAQ ................................................................................147

APPENDIX ......................................................................148

Temperature Measurement ............................. 149

Specifications .................................................. 152

Dimensions ..................................................... 155

Declaration of Conformity ............................... 156

INDEX ............................................................................157

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SAFETY INSTRUCTIONS

This chapter contains important safety instructions that you must follow

when operating the GOM-804/805 or when keeping it in storage. Read the

following before any operation to insure your safety and to keep the

GOM-804/805 in the best possible condition.

Safety Symbols

These safety symbols may appear in this manual or on the GOM-804/805.

WARNING

Warning: Identifies conditions or practices that could

result in injury or loss of life.

CAUTION

Caution: Identifies conditions or practices that could

result in damage to the instrument or to other properties.

DANGER High Voltage

Attention Refer to the Manual

Protective Conductor Terminal

Earth (ground) Terminal

Do not dispose electronic equipment as unsorted

municipal waste. Please use a separate collection facility

or contact the supplier from which this instrument was

purchased.

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GOM-804 & GOM-805 User Manual

Safety Guidelines

General Guideline

CAUTION

Do not place any heavy objects on the instrument.

Avoid severe impact or rough handling that leads to

damaging the instrument.

Do not discharge static electricity to the instrument.

Use only mating connectors, not bare wires, for the

terminals.

Do not disassemble the instrument unless you are

qualified as service personnel.

(Note) EN 61010-1:2010 specifies the measurement categories and

their requirements as follows. The GOM-804/805 doesn’t fall

under category II, III or IV.

Measurement category IV is for measurements performed at the

source of low-voltage installation.

Measurement category III is for measurements performed in the

building installation.

Measurement category II is for measurements performed on the

circuits directly connected to the low voltage installation.

Power Supply

WARNING

AC Input voltage: 100 - 240 V AC, 50 - 60Hz, 25VA

The power supply voltage should not fluctuate more

than 10%.

Connect the protective grounding conductor of the AC

power cord to an earth ground, to avoid electrical

shock.

Cleaning the

GOM-804/805

Disconnect the power cord before cleaning.

Use a soft cloth dampened in a solution of mild

detergent and water. Do not spray any liquid into the

instrument.

Do not use chemicals or cleaners containing harsh

material such as benzene, toluene, xylene, and acetone.

Operation

Environment

Location: Indoor, no direct sunlight, dust free, almost

non-conductive pollution (Note below)

Relative Humidity: < 80%

Altitude: < 2000m

Temperature: 0°C to 40°C (operation)

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SAFETY INSTRUCTIONS

(Note) EN 61010-1:2010 specifies the pollution degrees and their

requirements as follows. The GOM-804/805 falls under degree 2.

Pollution refers to “addition of foreign matter, solid, liquid, or

gaseous (ionized gases), that may produce a reduction of dielectric

strength or surface resistivity”.

Pollution degree 1: No pollution or only dry, non-conductive pollution

occurs. The pollution has no influence.

Pollution degree 2: Normally only non-conductive pollution occurs.

Occasionally, however, a temporary conductivity caused by

condensation must be expected.

Pollution degree 3: Conductive pollution occurs, or dry,

non-conductive pollution occurs which becomes conductive due to

condensation which is expected. In such conditions, equipment is

normally protected against exposure to direct sunlight, precipitation,

and full wind pressure, but neither temperature nor humidity is

controlled.

Storage

Environment

Location: Indoor

Temperature: −10°C to 70°C

Disposal

Do not dispose this instrument as unsorted municipal

waste. Please use a separate collection facility or contact

the supplier from which this instrument was purchased.

Please make sure discarded electrical waste is properly

recycled to reduce environmental impact.

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GOM-804 & GOM-805 User Manual

Power cord for the United Kingdom

When using the instrument in the United Kingdom, make sure the power

cord meets the following safety instructions.

NOTE: This lead / appliance must only be wired by competent persons

WARNING: THIS APPLIANCE MUST BE EARTHED

IMPORTANT: The wires in this lead are coloured in accordance with the

following code:

Green/ Yellow:

Earth

Blue:

Neutral

Brown:

Live (Phase)

As the colours of the wires in main leads may not correspond with the

coloured marking identified in your plug/appliance, proceed as follows:

The wire which is coloured Green & Yellow must be connected to the Earth

terminal marked with either the letter E, the earth symbol or coloured

Green/Green & Yellow.

The wire which is coloured Blue must be connected to the terminal which is

marked with the letter N or coloured Blue or Black.

The wire which is coloured Brown must be connected to the terminal marked

with the letter L or P or coloured Brown or Red.

If in doubt, consult the instructions provided with the equipment or contact

the supplier.

This cable/appliance should be protected by a suitably rated and approved

HBC mains fuse: refer to the rating information on the equipment and/or

user instructions for details. As a guide, a cable of 0.75mm2should be

protected by a 3A or 5A fuse. Larger conductors would normally require 13A

types, depending on the connection method used.

Any exposed wiring from a cable, plug or connection that is engaged in a live

socket is extremely hazardous. If a cable or plug is deemed hazardous, turn

off the mains power and remove the cable, any fuses and fuse assemblies. All

hazardous wiring must be immediately destroyed and replaced in accordance

to the above standard.

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GETTING STARTED

This chapter describes the GOM-804/805 in a nutshell, including its main

features as well as its front and rear panels. After going through the panel

overview, follow the Power-up sequence before attempting to use the

instrument.

Please note the information in this manual was correct at the time of printing.

However as GW Instek continues to improve its products, changes can occur

at any time without notice. Please see the GW Instek website for the latest

information and content.

Characteristics

GOM-804/805 Characteristics ................................10

Key Features ...........................................................13

Model Lineup .........................................................14

Panel Overview

Front Panel Overview .............................................15

TFT-LCD Overview .................................................19

Rear Panel Overview...............................................21

Setup

Tilt Stand................................................................23

Power Up................................................................24

4 Wire Kelvin Connection .......................................25

Zeroing (Relative Function)....................................26

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GOM-804 & GOM-805 User Manual

GOM-804/805 Characteristics

GOM-804 and GOM-805 are modern high precision programmable DC

Milli-ohm meters suitable for low resistance measurements of switches, relays,

connectors, PCB tracks and a variety of other devices. The meters feature a

color TFT-LCD screen with easy-to-read measurement results. With the

easy-to-use features, superior performance and automatic test interfaces, these

meters are dependable instruments for resistance measurements.

Easy to Use

Features

Each test function on the GOM-804/805 can be easily

activated by pressing a single front panel key. All the

settings and measurement results are displayed and set on

the TFT-LCD panel at the same time making each

function naturally intuitive to use.

Each primary and secondary measurement result is

displayed prominently on the display along with any

corresponding settings. For sequential measurement

results, such as those from the scan or binning function,

are tabulated in an intuitive and easy-to-read format.

In addition, the meters can recall previously used settings

upon startup, allowing the meter to be ready the next

time it used in a matter of moments. The meters can also

save or recall up to 20 sets of function settings.

Performance

The GOM-804/805 has nine selectable measurement

ranges from 50mΩ to 5MΩ, a constant current source of

1uA to 1A, an accuracy of up to 0.05%, a 1uΩ resolution

and performs measurements using four wire Kelvin

connections for accurate, consistent measurements.

The ability to choose between high accuracy

measurements at 10 samples/sec (full scale at 50000

counts) or high speed measurements at 60 samples/sec

(full scale at 50000 counts), allows the GOM-804/805 the

flexibility to fulfill a number of different measurement

roles.

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GETTING STARTED

Advanced

Temperature

Measurements

The GOM-804/805 has a number of advanced

temperature functions that can be used with the optional

temperature probe, PT-100.

The temperature compensation function can extrapolate

what the resistance of a DUT will be at a desired

temperature, if the temperature coefficient of the DUT

and the resistance of the DUT at ambient temperature

are known.

The temperature conversion function can be used to

extrapolate what the temperature rise of a DUT will be at

specified resistance if the initial resistance, initial

temperature and the constant for the DUT are known.

Drive Signals

The GOM-805 can select a number of different drive

signals to suit a number of different measurement

scenarios, for example the Pulse setting can be used to

cancel the effects of thermoelectric EMF on the

measurement results.

Dry Circuit

Testing

Dry circuit testing allows the GOM-805 to measure the

contact resistance of switches and connectors according

to the DIN IEC 512 and ASTM B539 standards. The

open circuit voltage will not exceed 20mV in this mode

to prevent the oxidization layer on metal switches and

connector points from breakdown. GOM-805 only.

Automatic

Testing

For automatic testing The GOM-804/805 has a handler

interface designed for automatic testing. The handler

interface outputs the status of PASS, FAIL, HI, LO,

READY and EOT signals and inputs a trigger control

signal. Automatic testing is used with the binning,

compare and scan functions.

For computer control applications, RS-232 and USB are

standard remote interfaces, with GPIB as standard only

for the GOM-805 and GOM-804G.

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