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Summary of Contents for GW Instek GDM-350B
- Page 1 Handheld Digital Multimeter GDM-350B USER MANUAL GW INSTEK PART NO. 82DM-350B0M01 ISO-9001 CERTIFIED MANUFACTURER...
- Page 2 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.
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Page 3: Table Of Contents
Table of Contents 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 ...................... - Page 4 GDM-350B User Manual VERVIEW 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 multi- purpose socket is used to measure SMTs as well.
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Page 5: Overview
OVERVIEW 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: Item Description Operating Manual 1 piece Test Leads 1 pair K-type Temperature Probe 1 piece (Nichrome-Nickel Aluminum Thermocouple) Multi-Purpose Socket... -
Page 6: Safety Information
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. - Page 7 OVERVIEW 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.
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Page 8: International Electrical Symbols
GDM-350B User Manual International Electrical Symbols 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... -
Page 9: Overall Specification
OVERVIEW Overall Specification Maximum voltage between any terminal and ground: Refer to the different input protection voltage ranges shown on the terminals. 10A terminal: Set (CE) 10A H 240V Fast Type Ceramic Fuse φ6x25mm. mA terminal: Set (CE) 1 A H 240V Fast Type Ceramic Fuse φ6x25mm. Operating temperature: 0˚C~40˚C, 32˚F ~104˚F. -
Page 10: The Meter Structure
GDM-350B User Manual The Meter Structure (see diagram 1) LCD Display Power Button Rotary Switch Input Terminals HOLD Button diagram 1... -
Page 11: Measurement Operation
MEASUREMENT OPERATION EASUREMENT 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. -
Page 12: Dc Or Ac Voltage Measurement
GDM-350B User Manual DC or AC Voltage Measurement (see diagram 2) Diagram 2 Turn the rotary switch to the V or V position for voltage measurement. Insert the red test lead into the “V” terminal and the black test lead into the “COM”... - Page 13 MEASUREMENT OPERATION high impedance circuits. If the circuit impedance is less than or equal to 10kΩ, the error is negligible (0.1% or less). Warning: To avoid damage to the meter, please do not attempt to input more than 250V. To avoid electrical shock, please pay attention during high voltage ...
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Page 14: Dc Current Measurement
GDM-350B User Manual DC Current Measurement (see diagram 3) Diagram 3 Turn the rotary switch to the “A “ position for current measurement. Insert the red test lead into the “mA” or “10A” terminal, and the black test lead into the “COM” terminal. Connect the test leads to the DUT being measured. - Page 15 MEASUREMENT OPERATION Warning: Pre-requisites: Remove the power from the circuit before connecting the test leads to the DUT. Select the correct terminal input and turn the rotary switch to select the measurement function. If the correct range is not known, select the highest range and work your way down to a lower range if needed.
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Page 16: Resistance Measurement
GDM-350B User Manual Resistance Measurement (see diagram 4) Diagram 4 Turn the rotary switch to the “Ω” position for resistance measurement. Insert the red test lead into the “Ω” terminal and the black test lead into the “COM” terminal. Connect the test leads to the DUT being measured. The... - Page 17 MEASUREMENT OPERATION Warning: If the LCD displays “1”, it indicates the circuit is open or that the resistance exceeds the maximum range of the meter. To maintain the resistance measurement accuracy, remove circuit power and discharge all high voltage capacitors when measuring resistance. The test leads cause a resistance drop of 0.1Ω...
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Page 18: Diode Measurement
GDM-350B User Manual Diode Measurement (see diagram 5) Diagram 5 Turn the rotary switch to the “ ” position for diode measurement. Insert the red test lead into the “ ” terminal and the black test lead into the “COM” terminal. The red test lead is “+”, the black test lead is “-”. - Page 19 MEASUREMENT OPERATION Warning: The LCD displays “1” to indicate that the circuit is open or that the polarity of the diode is incorrect. To ensure the accuracy of the diode measurement, disconnect power from the circuit and discharge all high voltage capacitors during the measurement. The open circuit voltage for diodes is 2.3V.
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Page 20: Continuity Measurement
GDM-350B User Manual Continuity Measurement (see diagram 6) Diagram 6... - Page 21 MEASUREMENT OPERATION Turn the rotary switch to the “ ” position. ΩmA Insert the red test lead into the “ ” terminal and the black test lead into the “COM” terminal. If the resistance between both terminals is >70Ω, it indicates an open-circuit and no buzzer will sound, but if the resistance between both terminals is ≤10Ω, it indicates a good connection and the buzzer will sound.
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Page 22: Transistor Hfe Measurement
GDM-350B User Manual Transistor hFE measurement (see diagram 7) Diagram 7... - Page 23 MEASUREMENT OPERATION Turn the rotary switch to the “hFE” position. Put the multi-purpose socket into the terminal. Check whether the transistor is either PNP or NPN or SMT, then connect the transistor to be measured to the corresponding jacks. The LCD display shows the hFE reference value. The testing requirement: basic current 10µA,Vce of 2.3V.
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Page 24: Temperature Measurement
GDM-350B User Manual Temperature Measurement (see diagram 8) Diagram 8... - Page 25 MEASUREMENT OPERATION Turn the rotary switch to the “˚C” position. Put the multi-purpose socket into the correct terminal. The K-type thermocouple can only be used for measurements below 230˚C, if you want to measure over 230˚C, you need to buy another type of thermocouple.
- Page 26 GDM-350B User Manual CCURACY SPECIFICATIONS Accuracy: ±(a% reading + b digits), guaranteed for 1 year Operating temperature: 23˚C ± 5˚C Relative Humidity: <75% DC Voltage Range Resolution Accuracy 200mV 0.1mV 2000mV ±(0.5% Reading + 2 Digits) 0.01V 200V 0.1V 250V ±(0.8% Reading + 2 Digits)
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Page 27: Accuracy Specifications
ACCURACY SPECIFICATIONS AC Voltage Range Resolution Accuracy 200V 0.1V ±(1.2 Reading% +3 Digits) 250V Input impedance: about 4.5MΩ; Frequency: 45Hz~400Hz. Display: effective value of a sine wave (average value) each measurement is applicable from 5% of range as reference. Maximum input voltage: 250V AC. - Page 28 GDM-350B User Manual DC Current Range Resolution Accuracy 2000µA 1µA ±(1% Reading +2 Digits) 20mA 0.01mA ±(1% Reading + 2 Digits) 200mA 0.1mA ±(1.2% Reading +2 Digits) 0.01A ±(2% Reading +5 Digits) Overload Protection: mA range: F2 fuseφ6×25mm, F 1A H 240V (CE) 10A range: F1 fuseφ6×25mm, F 10A H 240V (CE)
- Page 29 ACCURACY SPECIFICATIONS Resistance Range Resolution Accuracy 200Ω 0.1Ω 2000Ω 1Ω 20kΩ 0.01kΩ ±(0.8% Reading + 5 Digits) 200kΩ 0.1kΩ 2000kΩ 1kΩ 20MΩ 0.01MΩ ±(1% Reading + 5 Digits) Overload Protection: 250V AC or DC...
- Page 30 GDM-350B User Manual Temperature Measurement Range Resolution Accuracy -40˚C~ -20˚C -(8% Reading + 5 digits) -20˚C~0˚C ± 4 digits 1˚C > 0˚C~100˚C ±(1.0% Reading + 3 digits) >100˚C~1000˚C ±(2.5% Reading + 2 digits) Overload Protection: 250V DC or AC The enclosed K-type thermocouple can only be used for temperature...
- Page 31 ACCURACY SPECIFICATIONS Diode, Transistor Function Range Resolution Remark Diode Display positive voltage decline Transistor 1 Continuity Test Function Range Resolution Remark Continuity Test 1Ω <10Ω Buzzer beeps continuously Overload Protection: 250V DC or AC.
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Page 32: Maintenance
GDM-350B User Manual AINTENANCE Warning Make sure the test leads are removed and the power is turned off the meter before opening the cover. General Service and Maintenance Periodically wipe the case with a damp cloth and mild detergent. Do not use ... -
Page 33: Replacing The Battery And Fuse
MAINTENANCE Replacing the Battery and Fuse (see diagram 12) Warning On the LCD display, the battery warning indicator, “ ” indicates the battery is low and needs to be replaced with a new battery. Failure to replace the battery causes the measured result to be unstable. Battery Specification: 9V 6F22 or NEDA 1604 or 006P (diagram 12) - Page 34 GDM-350B User Manual Operating Steps: Turn the power off and remove the test leads from the meter. Use a screwdriver to remove the screws from the battery cover. The old battery can now be removed. The fuses can be replaced by using a screwdriver to remove the two screws holding the fuses in place.
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