GDM-452 2014 01_13
Contents
1. one into COM jack 2 Place function switch at KHZ range and connect test leads to frequency signal in series Frequency value can be read from display directly A Note The accuracy cannot be ensured if input signal voltage is higher than 30Vrms and please take extreme care Testing Diodes and Continuity 1 Insert black test lead into COM jack and insert red one into VQ jack with polarity for red probe place function switch at 9 gear and connect test leads to measured diode Reading is approximate positive drop for diode 2 Connect test leads to 2 ends of measurement wires Embedded buzzer rings if resistance between 2 ends is less than 302 GW INSTEK 1 Press HOLD button to realize such function 2 Whether the test leads are disconnected or not will not influence Data Hold function Auto Power Off 1 The Multimeter is designed with automatic power off circuit to power off after instrument operates for about 15 minutes and enter into sleeping status 2 Press POWER button twice to wake up the Multimeter from the sleep mode VI Maintenance A This kind of Multimeter belongs to precise electronic instruments Please do not alter wires randomly and pay attention to following items 1 Do not access to voltage which is higher than 1000VDC or 750Vrms AC 2 Do not access to voltage signals when function switch is in position of current ranges 2 and gt k ea 3 Please do not use2. protection uA mA input 200 mA 250V 5 x 20 mm A input end 10A 250V 6 x 25 mm Maximum input current 10A For current over 5A measuring time shall not exceed 15 seconds Measured voltage drop 200mV for full range AC current frequency range 40 400Hz Display True RMS value Waveform coefficient is not more than 5 Resistance Range Resolution Accuracy 200 2 0 010 0 5 rdg 10digits 2KQ 0 10 0 3 rdg 3digits 20k 2 1Q 200k 2 109 0 3 rdg 1digits 2M Q 1009 20M 2 1kQ 0 5 rdg 1digits A overload protection 250V DC or AC RMS for all ranges Open circuit voltage About 3V for 200Q range Note please short circuit the test leads when using 200 Q range to measure and subtract this shorted value from all subsequent measured values so as to obtain accurate reading Capacitance Range Resolution Accuracy 20nF 1pF 200nF 10pF 7 0 2uF 100pF 4 0 rdg 20digits 20x F 1nF Testing signal is about 400Hz 40mVrms Overload protection uA mA to V terminal input 200 mA 250V Y 5 x 20 mm Frequency Range Resolution Accuracy 20kHz 1Hz 1 5 rdg 5digits Input sensitivity lt 200mVrms The maximum input amplitude lt 30Vrms Overload protection 250Vrms Diode and Continuity Range Instructions Testing conditions Display approximate value Positive DC current is about 1mA gt of forward voltage drop for and reverse D
3. this meter before installing battery or tightening rear cover 4 Battery or fuse cannot be replaced until removing test leads and power off VI Replacing the Battery Screw Battery Figure 2 Vil Accessories 1 User s Manual 1 pc 2 Test Leads 1 pair 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
4. C voltage is about diode 2 8V If resistance lt 300 the en buzzer sounds Display approximate KQ value Open circuit voltage is about 3 0V A Overload protection 250V DC or AC effective value P N 82DM 45200M01 V Making Measurements Notice before operation 1 Power on the Multimeter and inspect 9V battery Replace the battery if displays If not proceed into next step 2 Pay attention to rated voltage or current value next to A near input terminals any input that go beyond the rating may damage the Multimeter 3 Function switch shall be placed in required range before test 4 Instrument introduction LCD display POWER button 8 CANCEL AUTO POWER OFF button AC DC button 6 HOLD button gt Function switch if Input jack Figure 1 DC Current 1 Insert test leads into input jacks Red to V and black to COM 2 Set the function switch to V range Connect test leads to the wire under test in parallel and the positive polarity of the test end will indicate A Notice 1 Set to the maximum range and reduce it gradually if the measured voltage is unknown 2 1f 1 displays on LCD it indicates over range please select a higher range for your measurement 3 A indicates not to input voltage higher than 1000V which may cause damage to the Multimeter or personal injury although the reading may be obtained 4 Extre
5. GW INSTEK GDM 452 Operating Manual Miodern Digital Multimeters I Introduction The GDM 452 is a 20000 count handheld digital multimeter with remarkably stable and reliable operation It is mainly supported with a dual integral A D converter based on CMOS technology and also offers overload protection for all ranges This model can measure DC amp AC voltage DC amp AC current resistance capacitance diode transistor frequency and continuity I Safety Information The GDM 452 is designed and manufactured in compliance with IEC61010 1 CAT I 1000V CAT II 600V and CAT II 300V overvoltage standards A Warnings Use the meter as specified in the manual otherwise the protection offered by the multimeter may be impaired e Do not use the multimeter with back cover opened it may cause electric shock e Set to a proper range for your measurement e Check the test leads for any damaged insulation or broken wires e Insert red and black test leads into proper input terminals and ensure good contact between them e Do not input signal beyond the rated values of the multimeter otherwise it may cause electric shock or damage to the multimeter e Prohibit switching the range during the voltage or current measurement for it may cause damage to the multimeter e Please use replacement parts with the same model or similar electrical specifications e To avoid electric shock Do not apply any voltage above 1000V between COM an
6. d grounding e Please take caution when working voltage goes above 60VDC or 30VAC RMS e To ensure the accuracy please replace the batteries as soon as appears e Shut off the power timely after the measurements complete Take out the batteries if not used for a long time e Do not use the multimeter in places exposed to high temperature high moisture The performance of the multimeter may be compromised if moisture affected e To prevent damage to the multimeter or personal injury do not alter internal wiring randomly e Clean the multimeter casing with slightly damped soft cloth and mild agent Do not use any abrasives and corrosives International Electrical Symbols Low Battery Indication Grounding A Warning DC AC o Double Insulated n Buzzer gt Diode ce Conforms to European Union Standards Product Features 30 ranges for function selection Over range display 1 Display count 19999 Fast acting fuse protection for current ranges 200mA and 10A Full range overload protection Auto power off Temperature range Operating 0 C 40 C 32 F 104 F Storage 10C 50C 14 FT 122 F 8 Altitude lt 2 000m 9 Low Battery Indication displays 10 Dimensions 186x91x39mm 11 Weight About 300g not including test leads NOORWN IV Technical Specifications Accuracy a of reading b dig
7. its Warranty period is 1 year Ambient temperature 23 C 5 C Relative humidity lt 75 DC Voltage Range Resolution Accuracy 200mV 101 V 0 05 rdg 3digits 2V 100 u V 20V 1mV 0 1 rdg 3digits 200V 10mV 1000V 100mV 0 15 rdg 5digits A Input impedance 10M for all ranges Overload protection 250V DC or AC RMS value for 200mV range and 750Vrms or 1000Vp p peak value for other ranges AC Voltage Range Resolution Accuracy 200mV 101 V 0 8 rdg 10digits 2V 1001 V 0 5 rdg 10digits 20v my 0 6 rdg 10digits 200V 10mV 750V 100mV 0 8 rdg 15digits A Input impedance 10M 2 for all ranges AC voltage frequency range 40Hz 400HZ Overload protection 250V DC or AC RMS value for 200mV range and 750Vrms or 1 000Vp p peak value for other ranges Display Effective average value DC Current Range Resolution Accuracy ama en 0 5 rdg 5digits 20mA 1uA 200mA 101 A 0 8 rdg 5digits 10A 1mA 2 rdg 10digits A Overload protection uA mA input 200 mA 250V 5 x 20 mm A input end 10A 250V 6 x 25 mm Maximum input current 10A For current over 5A measuring time shall not exceed 15 seconds Measured voltage drop 200mV for full range AC Current Range Resolution Accuracy ar Se 0 8 rdg 10digits 20mA 1uA 200mA 101 A 1 2 rdg 10digits 10A 1mA 2 5 rdg 10digits A Overload
8. me care should be taken to avoid electric shock when measuring high voltage Measuring AC Voltage 1 Insert black test lead into COM jack and insert red one into V jack 2 Place function switch at V range scope and then connect test leads to measurement wires in parallel Notice 1 Please refer to Notice for DC voltage 2 N refers to input voltage being not more than 750V The higher voltage is possible but it may cause damage to internal wires and electric shock Measuring DC Current 1 Insert black test lead into COM jack and insert red one into mA jack if measured current is not more than 200mA Insert the red test lead into 10A jack if measured current is between 200mA and 10A 2 Place function switch at A7 range and then connect testing leads to measurement loop in series It will dispaly current and polarity of red test lead at the same time A Notice 1 Set to the maximum range and reduce it gradually if the measured current is unknown 2 If 1 displays on LCD it indicates over range please select a higher range for your measurement 3 A indicates the maximum input current mA input is protected by 200mA 250V fuse 10A 250V fuse is used to protect 10A range Measuring AC Current 1 Insert black test lead into COM jack and insert red one into mA jack if measured current is not more than 200mA insert red test lead into 10A jack if measured current is between 200mA and 10A 2 Place function swi
9. tch at A range and connect testing leads to measurement loop in series A Notice 1 Please refer to Notice for DC current measurement Measuring Resistance 1 Insert black test lead into COM jack and insert red one into Q jack 2 Place function switch at Q range and connect testing leads to measurement loop in series A Notice 1 Over range of 1 will be displayed if measured resistance exceeds the maximum value of selected range It is necessary to select higher range and reading cannot be stable until several seconds for resistance of more than 1M 2 It is normal for high resistance reading 2 Instrument displays 1 ifthere is no input for open circuit etc 3 Be sure to power off measured wires and discharge capacitance load when inspecting wire impedance Measuring Capacitance 1 Insert the tested capacitor directly into capacitance jacks without need of test leads 2 The floating reading exists every time you switch to another capacitance range and reset to zero before connecting to a tested capacitor which however will have no impact on the accuracy A Notice 1 Discharge the tested capacitor before measurement although the capacitance ranges are protected internally it may also cause damage to the multimeter 2 Reading stabilizing period is required when measuring large capacitance 3 Unit 1pF 10 6 u F 1nF 10 3 u F Measuring Frequency 1 Insert red test leads into HZ jack and insert black
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