GW Instek GDM-350B User Manual

Handheld Digital Multimeter

GDM-350B

USER MANUAL

GW INSTEK PART NO. 82DM-350B0M01

ISO-9001 CERTIFIED MANUFACTURER

This manual contains proprietary information, which is protected by copyright. All rights are reserved. No part of this manual may be photocopied, reproduced or translated to another language without prior written consent. The information in this manual was correct at the time of printing. However, we continue to improve our products and therefore reserve the right to change the specifications, equipment, and maintenance procedures at any time without notice.

Good Will Instrument Co., Ltd. No. 7-1, Jhongsing Rd., Tucheng Dist., New Taipei City 236, Taiwan.

Table of Contents

OVERVIEW............................................................................................................................. 2

Unpacking & Inspection ................................................................................................................... 3

Safety Information............................................................................................................................. 4

International Electrical Symbols ....................................................................................................... 6

Overall Specification ......................................................................................................................... 7

The Meter Structure .......................................................................................................................... 8

MEASUREMENT OPERATION ............................................................................................. 9

DC or AC Voltage Measurement .................................................................................................... 10

DC Current Measurement .............................................................................................................. 12

Resistance Measurement ............................................................................................................... 14

Diode Measurement ....................................................................................................................... 16

Continuity Measurement ................................................................................................................ 18

Transistor hFE measurement ......................................................................................................... 20

Temperature Measurement ............................................................................................................ 22

ACCURACY SPECIFICATIONS ............................................................................................ 24

MAINTENANCE .................................................................................................................. 30

General Service and Maintenance .................................................................................................. 30

Replacing the Battery and Fuse ...................................................................................................... 31

GDM-350B User Manual

OVERVIEW

The GDM-350B multimeter is a hand-held 3 1/2digit multimeter with an advanced design, multiple functions and reliable performance. This meter is fully capable of measuring both AC and DC voltage, DC current, resistance, temperature, the forward voltage drop of diodes, transistors, hFE and continuity tests. The multipurpose socket is used to measure SMTs as well. This operating manual covers information on safety and precautions to fulfill CE standards. Please read the relevant information carefully and observe all the warnings and notes.

Warning

To avoid electric shock or personal injury, read the “Safety Information”

carefully before using the Meter.

OVERVIEW

Item

Description

Qty 1 Operating Manual

1 piece

Test Leads

1 pair

K-type Temperature Probe (Nichrome-Nickel Aluminum Thermocouple)

1 piece

Multi-Purpose Socket

1 piece

Unpacking & Inspection

Open the package case and take out the Meter. Check the following items carefully to see if any parts are missing or damaged:

In the event that you find any parts missing or damaged, please contact your dealer immediately.

GDM-350B User Manual

Safety Information

This meter complies with the IEC/EN61010-1 standard, pollution degree 2, overvoltage category (CAT III 250V) with double insulation. Only use the meter as specified in this operating manual, otherwise the protection provided by the meter may be impaired.

1. Before using the meter inspect the case. Do not use the meter if it is damaged

or if the case (or part of the case) is removed. Look for cracks or missing plastic. Pay attention to the insulation around the connections.

2. Inspect the test leads for damaged insulation or exposed metal. Before using

the meter replace any damaged test leads with test leads of the same model number or of the same electrical specifications

3. Replace the battery as soon as the battery indicator “ ” appears. With a low

battery, the meter might produce false readings that can lead to electric shock and personal injury.

4. Turn measurement on only if the correct input terminals are used.

5. Do not apply more than the rated voltage, as marked on the meter in order to

avoid possible electric shock or personal injury and to avoid possible damage to the meter

6. Do not change the measuring range during the testing as it causes damage to

the meter.

OVERVIEW

7. When each measurement has been completed, disconnect the test leads from

the DUT and then turn the power off from the meter. Remove the test leads from the input terminals of the meter. This is vital for high current measurement.

8. When the meter is working at an effective voltage over 60V in DC or 30Vrms in

AC, special care should be taken.

9. Do not use or store the meter in an environment with high temperature and

humidity. The performance of the meter may deteriorate if dampened.

10. The internal circuit of the meter should not be tampered with. To avoid

damage to the meter when cleaning, use soft cloth and mild detergent to clean the surface of the meter when servicing. No abrasives or solvent should be used to prevent the surface of the meter from corrosion and damage.

GDM-350B User Manual

Battery has insufficient charge

Ground

Warning: Refer to the Operating Manual

AC (Alternating Current)

DC (Direct Current)

Double Insulated

Conforms to Standard of European Union

International Electrical Symbols

OVERVIEW

Overall Specification

1. Maximum voltage between any terminal and ground: Refer to the different

input protection voltage ranges shown on the terminals.

2. 10A terminal: Set (CE) 10A H 240V Fast Type Ceramic Fuse φ6x25mm.

3. mA terminal: Set (CE) 1 A H 240V Fast Type Ceramic Fuse φ6x25mm.

4. Operating temperature: 0˚C~40˚C, 32˚F ~104˚F.

Relative Humidity: 0˚C ~30˚C below ≤75%, 30˚C ~40˚C below ≤50%. Storing temperature:-10˚C ~50˚C (14˚F ~122˚F).

5. Electromagnetism:

Under 1V/m emission: Best Total Accuracy= Specific Accuracy + Measurement 5%, Over 1V/m emission does not have any specific index.

6. Elevation: 0~2000m.

7. Internal battery: 9V 6F22 or NEDA 1604 or 006P.

8. Low Battery: indicated by “ ” on the LCD display.

9. Product size: 72mm×137mm×35mm.

10. Net Weight: About 200g (battery included).

11. Safety Standard:

IEC/EN 61010-1: CATIII 250V, Pollution Degree 2.

12. Conformance: CE.

GDM-350B User Manual

The Meter Structure

(see diagram 1)

1. LCD Display

2. Power Button

3. Rotary Switch

4. Input Terminals

5. HOLD Button

diagram 1

MEASUREMENT OPERATION

First check to see that the 9V battery is charged. Turn the rotary switch to a measurement position. If the battery charge is low, the “ ” indicator will be displayed on LCD panel. Ensure the input voltage or current does not exceed 250Vrms and 10A, respectively.

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