GW Instek GDM-357 User Manual

GDM-357

Ⅲ. PRODUCT FEATURES

(RMS value of sinewave)

Ⅰ. OVERVIEW

The brand-new GDM-357 is a 2000-count handheld digital multimeter featuring remarkably stable and reliable operation. It is designed with large-scale integrated circuits, a dual integral A/D converter and also offers overload protection for all ranges. The DMM can measure DC&AC voltage, DC&AC current, resistance, capacitance, diode, transistor, temperature, frequency, battery and continuity, which makes it a perfect solution for your work.

Ⅱ. SAFETY INFORMATION

This instrument is designed and manufactured in compliance with: GB4793, IEC61010-1, IEC1010-2-032, CAT.I 1000V,CATII 600V, Pollution Degree 2 and Double Insulation standards.

Warning Please operate the instrument as specified in the manual, otherwise the protection offered by the instrument would be compromised.

test leads

The red and black test leads should be inserted in the proper terminals and ensured with

good contact.

Switching the range

Use only the replacement fuse with the same model or identical electrical specifications.

Display Count: 1999.

Auto Power Off. Temperature Range: Working:0℃~ 40℃(32℉ ~ 104℉); Storage: -10℃~ 50℃(14℉ ~ 122℉). Low Battery Indication: on upper left corner of LCD. Data Hold

(Main unit+holster+tilt stand+battery, excluding test leads)

Ⅳ. TECHNICAL SPECIFICATIONS

Input

DC current

(RMS value of sinewave)

GDM-357

RMS.

GDM-357

Note: At 200MΩ range, the instruments normally displays 10 digits when the test leads are

shorted. Please subtract 10 digits from the subsequent measurement readings.

Relative Humidity ≤65% for measurements at 200MΩ range.

400Hz, 40mVrms

discharging the capacitor.

Continuity and Diodes

Resistance≤10Ω, the buzzer sounds;

＞10Ω, the buzzer doesn't necessarily sound; Display approximate resistance

value, unit: Ω.

RMS.

GDM-357

＞50µF, for reference only.

GDM-357

compromised.

Clean the instrument casing with slightly damp cloth and mild agent. No abrasives and solvents are allowed.

International Electrical Symbols

AC current

GDM-357

P/N:82DM-35700M01

Ⅴ.

2) Set the rotary switch to A range; Connect test leads to the tested circuit in series.

near the input terminals

Multimeter Description

Rotary switch

Input Terminals

Measuring DC Voltage

1) Insert test leads into input terminals(Red to V and black to COM).

2) Set the rotary switch to 　　　　　range; Connect test leads to the power or load under test, and the positive polarity of the test end will indicate.

Measuring AC Voltage

1) Insert test leads into input terminals(Red to V and black to COM).

2) Set the rotary switch to V range; Connect test leads to the power or load under test.

Measuring Resistance

1) Insert test leads into input terminals(Red to Ω and black to COM).

2) Set the rotary switch to Ω range; Connect test leads to tested resistor in parallel.

all capacitors

Measuring Capacitance

1) Although the capacitance ranges have been protected internally, you still need to discharge all tested capacitors so as to avoid any damage to the instrument or any measurement error.

Measuring Temperature

Testing Diodes and Continuity

1) Insert test leads into input terminals(Red to VΩ and black to COM,"+" for the red test lead).

Then set the rotary switch to 、 ; Connect test leads to tested diode. The displayed reading is the approximate value of forward voltage drop of diode.

2) Connect test leads to the circuit under test, if the resistance between two tested ends is ＜10 Ω , the built-in buzzer sounds.

Auto Power Off

terminals

power off,

Ⅶ.

Operating Manual Test Leads

1 pc 1 pair 1 pc

The content of this manual is subject to changes without notice.

Measuring DC current

1) Insert the black test lead into COM terminal. For current≤200mA, insert the red test lead into

mA terminal. If current goes up to 10A, insert red test lead into 10A terminal.

2) Set the rotary switch to A range; Connect test leads to the tested circuit in series. The polarity of red test lead will show.

Measuring AC Current

1) Insert the black test lead into COM terminal. For current≤200mA, insert the red test lead into

mA terminal. If the current goes up to 10A, insert red test lead into 10A terminal.

Ⅵ.

randomly

voltages higher than 1000V DC or 750AC RMS.

test leads

the test leads from input terminals.

current ranges

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 of Good Will company. The information in this manual was correct at the time of printing. However, Good Will continues to improve products and reserves the rights to change specification, 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

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