1. Manuals
  2. Brands
  3. Good Will Manuals
  4. Multimeter
  5. GDM-360
  6. User manual

Good Will GDM-360 User Manual

Handheld digital multimeter
Hide thumbs
Table of Contents

Advertisement

Quick Links

Download this manual
Handheld Digital Multimeter
GDM-360, GDM-397, GDM-398, GDM-461
USER MANUAL
GW INSTEK PART NO. 82DM-46100MA1
ISO-9001 CERTIFIED MANUFACTURER

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the GDM-360 and is the answer not in the manual?

Questions and answers

Subscribe to Our Youtube Channel

Summary of Contents for Good Will GDM-360

  • Page 1 Handheld Digital Multimeter GDM-360, GDM-397, GDM-398, GDM-461 USER MANUAL GW INSTEK PART NO. 82DM-46100MA1 ISO-9001 CERTIFIED MANUFACTURER...
  • Page 2 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.

  • Page 3: Table Of Contents

    Table of Contents Table of Contents OVERVIEW..........................4 Unpacking Inspection ........................5 Safety Information ..........................6 Rules for Safe Operation ........................7 International Electrical Symbols ....................... 9 The Meter Structure ........................10 Rotary Switch ........................... 11 Functional Buttons.......................... 12 Display Symbols ..........................13 MEASUREMENT OPERATION ...................
  • Page 4 Outputting Data (Except GDM-398) ....................43 The Use of Relative Value Mode ..................... 44 The BLUE button ..........................45 Turning on the Display Backlight (GDM-360/397/398 only) ............45 Sleep Mode (GDM-360/397/398 only) ................... 45 GENERAL SPECIFICATIONS ....................46 Accuracy Specifications........................48 DC Voltage ............................
  • Page 5 Table of Contents Replacing the Fuses ........................71 USB and RS232C Serial Port ......................73...

  • Page 6: Overview

    To avoid electric shock or personal injury, read the “Safety Information” and “Rules for Safe Operation” carefully before using the Meter. Digital Multimeter Model GDM-360 (True RMS), GDM-397, GDM-398 and GDM- 461 (True RMS) (hereafter referred to as “the Meter”) are auto ranging multimeters.

  • Page 7: Unpacking Inspection

    GDM-360/397/398/461 User Manual Unpacking Inspection Open the package case and take out the Meter. Check the following items carefully to see if there are any missing or damaged parts: Item Description User Manual 1 piece Test Lead 1 pair K-type Temperature Probe (thermocouple) (GDM-397 only)

  • Page 8: Safety Information

    OVERVIEW Safety Information This Meter complies with the EN61010-1 and EN61010-2-030 standards: in pollution degree 2, overvoltage category (CAT. III 1000V, CAT. IV 600V) and double insulation. CAT III: Distribution level, fixed installation, with smaller transient overvoltages than CAT. IV. CAT IV: Primary supply level, overhead lines, cable systems etc.

  • Page 9: Rules For Safe Operation

    GDM-360/397/398/461 User Manual Rules for Safe Operation Warning To avoid possible electric shock or personal injury, and to avoid possible damage to the Meter or to the equipment under test, adhere to the following rules: Before using the Meter inspect the case. Do not use the Meter if it is damaged or ...
  • Page 10 OVERVIEW Use the proper terminals, function, and range for your measurements.  Do not use or store the Meter in an environment with high temperature,  humidity, explosives, inflammable materials or strong magnetic fields. The performance of the Meter may deteriorate when dampened. When using the test leads, keep your fingers behind the finger guards.

  • Page 11: International Electrical Symbols

    GDM-360/397/398/461 User Manual A soft cloth and mild detergent should be used to clean the surface of the Meter  when servicing. No abrasives and solvents should be used to prevent the surface of the Meter from corrosion or damage.

  • Page 12: The Meter Structure

    OVERVIEW The Meter Structure (see figure 1) 1. LCD display 2. Functional buttons 3. Yellow button 4. Blue button 5. Rotary switch 6. Input terminals: figure 1...

  • Page 13: Rotary Switch

    The table below describes the relevant functions of each of the rotary switch positions. Rotary Switch Position Function V , mV AC and DC Voltage Measurement AC Voltage Measurement (GDM-360 only) DC Voltage Measurement (GDM-360 only) Ω Resistance Measurement Diode Test...

  • Page 14: Functional Buttons

     Press again to exit REL mode  For Model GDM-360/397: Press and hold for over 2 seconds to enter or exit RS232C or USB mode* (optional). *Note: For the GDM-461, there is no need to hold the REL for 2 seconds as the RS232C/USB mode is enabled by default after...

  • Page 15: Display Symbols

    GDM-360/397/398/461 User Manual *Note: For the GDM-398, holding the REL key 2 seconds will also display the DATA OUTPUT symbol, however the GDM-398 has no data output capability and thus this symbol can be ignored.  PEAK Press to step the display through Pmax and Pmin readings.
  • Page 16 OVERVIEW The continuity buzzer is on. MAX/MIN Maximum and Minimum reading. Data output is in progress. Note: This symbol has no function on the GDM-398 and should be ignored. The battery is low. Warning: To avoid false readings, which could lead to possible electric shock or personal injury, replace the battery as soon as the battery indicator appears.
  • Page 17 GDM-360/397/398/461 User Manual mF: Milli-farad. 1 x 10 or 0.001 farads µF: Microfarad. 1 x 10 or 0.000001 farads. nF: Nanofarad. 1 x 10 or 0.000000001 farads ˚C, ˚F ˚C: Centigrade. The unit of temperature. ˚F: Fahrenheit. The unit of temperature.

  • Page 18: Measurement Operation

    A. DC/AC Voltage Measurement (see figure 2) GDM-360/397/398 GDM-461 figure 2 Note The GDM-360 doesn’t have an AC/DC voltage range (V ). It does, however, have an AC/DC mV range (mV ) and separate AC and DC voltage ranges (V ,...
  • Page 19 GDM-397/398: Displays the effective value of a sine wave (mean value response). GDM-360/461: Displays the true rms value. 3. Press Hz% (GDM-360/397/398) or the yellow button (GDM-461) to obtain the frequency and duty cycle value.  Input Amplitude: (DC offset is zero) ...
  • Page 20 MEASUREMENT OPERATION Note In each range, the Meter has an input impedance of 10MΩ except for the mV  range which has an input impedance of 3000MΩ. This loading effect can cause measurement errors in high impedance circuits. If the circuit impedance is less than or equal to 10kΩ, the error is negligible (0.1% or less).

  • Page 21: Dc/Ac Current Measurement

    GDM-360/397/398/461 User Manual B. DC/AC Current Measurement (see figure 3) GDM-360/397/398 GDM-461 figure 3...
  • Page 22 MEASUREMENT OPERATION Warning Before connecting the Meter to the return circuit to be tested, cut off the current of the return circuit. If the fuse burns out during measurement, the Meter may be damaged or the operator may be hurt. Use the proper terminals, function, and range for each measurement.
  • Page 23 GDM-360/397/398/461 User Manual GDM-360/461: Displays the true rms value. 5. Press Hz% (GDM-360/397/398) or the yellow button (GDM-461) to obtain the frequency and duty cycle value. Input Amplitude: (DC offset is zero)  Input Amplitude:≥range×30%  Frequency response:GDM-397/398: ≤400Hz, GDM-360/461: ≤...

  • Page 24: Resistance Measurement

    MEASUREMENT OPERATION C. Resistance Measurement (see figure 4) mAuA VΩHz figure 4...
  • Page 25 GDM-360/397/398/461 User Manual Warning To avoid damaging the Meter or the DUT, disconnect power from the circuit and discharge all high-voltage capacitors before measuring resistance. To avoid harm to yourself, do not input voltages greater than DC 60V or AC 30V.
  • Page 26 MEASUREMENT OPERATION Note The test leads can add 0.2Ω to 0.5Ω of error to the resistance measurement. To  obtain precise readings for low-resistance measurements, short the leads beforehand to obtain the resistance of the test leads and use the relative measurement function button, REL , to automatically subtract the resistance of the test leads from the measured value.

  • Page 27: Testing For Continuity

    GDM-360/397/398/461 User Manual D. Testing for Continuity (see figure 5) figure 5...
  • Page 28 3. The buzzer sounds continuously if the resistor to be tested is <10Ω. The buzzer does not sound if the resistor to be tested is >35Ω. Note GDM-360/397/398: open circuit voltage is around 0.45V  GDM-461: open circuit voltage is around –3V When continuity testing has been completed, disconnect the connection between ...

  • Page 29: Testing Diodes

    GDM-360/397/398/461 User Manual E. Testing Diodes (see figure 6) figure 6...
  • Page 30 MEASUREMENT OPERATION Warning To avoid possible damage to the Meter and to the device under test, disconnect the circuit power and discharge all high-voltage capacitors before testing diodes. To avoid harm to yourself, do not input voltages greater than DC 60V or AC 30V. 1.
  • Page 31 GDM-360/397/398/461 User Manual Connect the test leads to the proper terminals as said above to avoid errors. The  LCD will display OL to indicate that the diode being tested is open or that the polarity is reversed. The Meter will display the forward voltage drop in voltage (V) units.

  • Page 32: Capacitance Measurement

    MEASUREMENT OPERATION F. Capacitance Measurement (see figure 7) mAuA VΩHz figure 7...
  • Page 33 COM terminal. 2. Set the rotary switch to . On the GDM-360/397/398, press BLUE button to select the nF measurement mode. At that time, the Meter will display a fixed value as shown below which is ...
  • Page 34 MEASUREMENT OPERATION 3. Connect the test leads to the DUT. The measured value shows on the display. Note It takes a longer time to measure a capacitance of more than 100μF.  The LCD displays OL to indicate that the tested capacitor is shorted or it exceeds ...

  • Page 35: Frequency Measurement

    GDM-360/397/398/461 User Manual G. Frequency Measurement (see figure 8) GDM-360/397/398 GDM-461 figure 8 Warning To avoid personal harm, do not attempt to input more than 30V rms when testing frequency. To measure frequency, connect the Meter as follows: 1. Insert the red test lead into the Hz terminal and the black test lead into the...
  • Page 36 MEASUREMENT OPERATION 2. Set the rotary switch to Hz%; frequency measurement is set to (Hz) as default, otherwise press the Hz% button (GDM-360/397/398) or the yellow button (GDM-461) to select Hz measurement mode. 3. Connect the test leads to the DUT.

  • Page 37: Temperature Measurement (Gdm-397 Only)

    GDM-360/397/398/461 User Manual H. Temperature Measurement (GDM-397 only) (see figure 9) figure 9...
  • Page 38 MEASUREMENT OPERATION Warning To avoid harm to yourself, do not input higher than DC 60V or AC 30V voltages. To measure temperature, connect the Meter as follows: 1. Set the rotary switch to ˚C or ˚F 2. Insert the temperature probe into the input terminal as shown on the figure 9. 3.

  • Page 39: Transistor Hfe Measurement (Gdm-398 Only)

    GDM-360/397/398/461 User Manual I. Transistor hFE Measurement (GDM-398 only) (see figure 10) figure 10...
  • Page 40 MEASUREMENT OPERATION 1. Set the rotary switch to hFE. 2. Insert the multi-purpose socket into the input terminal as shown on figure 10. 3. Insert the transistor to be tested into the corresponding multi-purpose socket jacks. 4. The LCD will display hFE nearest value. Note When transistor measurement has been completed, disconnect all the ...

  • Page 41: Ef Function (Gdm-398 Only)

    GDM-360/397/398/461 User Manual J. EF Function (GDM-398 only) (see figure 11) figure 11...
  • Page 42 MEASUREMENT OPERATION To use the EF function, connect the Meter as follows: 1. Set the rotary switch to EF and remove the test lead from the input terminals. 2. Place the front part of the housing with the marking towards the object being measured.

  • Page 43: Hold Mode

    GDM-360/397/398/461 User Manual Hold Mode Warning To avoid possibility of electric shock, do not use Hold mode to determine if circuits are without power. The Hold mode will not capture unstable or noisy readings. The Hold mode is applicable to all measurement functions.

  • Page 44: Range Button

    Press and hold RANGE for over 2 seconds to return to auto ranging mode; the  Meter beeps. MAX MIN button (GDM-360/397/398 only) Press MAX MIN to start recording of maximum and minimum values. Steps the  display through high (MAX) and low (MIN) readings. The Meter enters manual ranging mode after pressing MAX MIN button.

  • Page 45: Outputting Data (Except Gdm-398)

    GDM-360/397/398/461 User Manual Press PEAK to step the display through Peak Max and Peak Min readings.  Press and hold PEAK for over 2 seconds to exit Peak mode, the LCD displays the  present measurement values. Don’t press the”PEAK” key if the meter has entered “CAL”mode.

  • Page 46: The Use Of Relative Value Mode

    MEASUREMENT OPERATION The Use of Relative Value Mode The REL mode applies to all measurement functions except frequency/duty cycle measurement. It subtracts a stored value from the present measurement value and displays the result. For instance, if the stored value is 20.0V and the present measurement value is 22.0V, the reading would be 2.0V.

  • Page 47: The Blue Button

    It is used for selecting the required measurement function when there is more than one function at one position of the rotary switch. Turning on the Display Backlight (GDM-360/397/398 only) Warning In order to avoid mistakes arising from misread readings in insufficient light, please use the backlight function.

  • Page 48: General Specifications

     GDM-397/398: Maximum reading: 4000 (frequency 9999), analogue  bar graph: 41 segments  GDM-360: Maximum reading: 6000 (frequency 9999), analogue bar graph: 61 segments GDM-461: Maximum reading: 22000, analogue bar graph: 46  segments Measurement Speed: Updates 2~3 times/second.
  • Page 49 GDM-360/397/398/461 User Manual Overload indication: Display OL  Battery Deficiency: Display  Temperature:  Operating: 0˚C to +40˚C (32˚F to +104˚F).  Storage: -10˚C to +50˚C (14˚F to +122˚F).  Relative Humidity:  ≤75% @ 0˚C ~ 30˚C below ...

  • Page 50: Accuracy Specifications

    GENERAL SPECIFICATIONS Accuracy Specifications Accuracy: ±(a% reading + b digits), guaranteed for 1 year. Operating temperature：18˚C ~28˚C. Relative humidity: <75%. DC Voltage GDM-397/398 Range Resolution Accuracy Input Impedance Fixed Value Input GDM-398 GDM-397 40mV 0.01mV ±(0.8%+3) Around >3000MΩ 400mV 0.1mV ±(0.8%+3) 0.001V 1000V dc/ac (Vpp)
  • Page 51 GDM-360/397/398/461 User Manual GDM-360 Range Resolution Accuracy Input Impedance Fixed Value Input 60mV 0.01mV ±(0.8%+3) Around >3000MΩ 600mV 0.1mV ±(0.8%+3) 0.001V 1000V dc/ac (Vpp) 0.01V ±(0.5%+1) Around 10MΩ 600V 0.1V 1000V ±(1.0%+3) GDM-461 Range Resolution Accuracy Input Impedance Fixed Value Input 220mV 0.01mV...

  • Page 52: Ac Voltage

    GENERAL SPECIFICATIONS AC Voltage GDM-397/398 Range Resolution Accuracy 45~400Hz Input Impedance Fixed Value Input GDM-398 GDM-397 40mV 0.01mV ±(1.2%+5) Around >3000MΩ 400mV 0.1mV 0.001V 1000V dc/ ±(1.0%+3) 750Vrms ac 0.01V Around 10MΩ 400V 0.1V 750V ±(1.2%+5) Displays effective value of a sine wave. mV range is applicable from 5% of range ...
  • Page 53 GDM-360/397/398/461 User Manual GDM-360 Range Resolution Accuracy Input Fixed Value Impedance Input 45~1kHz >1kHz~3kHz 60mV 0.01mV Around ±(1.2%+5) ±(2.0%+5) >3000MΩ 600mV 0.1mV 0.001V ±(1.0%+3) ±(1.5%+5) 1000V dc/ 0.01V 750Vrms ac Around 600V 0.1V 10MΩ 750V ±(1.2%+5) ±(3.0%+5) GDM-360:  ...
  • Page 54 GENERAL SPECIFICATIONS GDM-461 Range Resolution Accuracy Input Fixed Value Impedance Input 45~1kHz >1kHz~10kHz 220mV 0.01mV ±(1.0%+10) ±(1.5%+50) Around >3000MΩ 2.2V 0.0001V ±(0.8%+10) ±(1.2%+50) 1000V dc/ 0.001V Around 750Vrms ac 220V 0.01V ±(2.0%+50) 10MΩ 750V 0.1V ±(1.2%+10) ±(3.0%+50) True RMS is applicable from 10% of range to 100% of range. ...

  • Page 55: Dc Current

    GDM-360/397/398/461 User Manual DC Current GDM-397/398 Range Resolution Accuracy Overload Protection 400μA 0.1μA ±(1.0%+2) Fuse 1: F600mA H 1000V,φ6.35 4000μA 1μA x 31.8mm 40mA 0.01mA ±(1.2%+3) 400mA 0.1mA 0.001A ±(1.5%+3) Fuse 2: F10A H 1000V,φ10.3 x 0.01A 38.1mm Remarks: When ≤5A: Continuous measurement is allowed.
  • Page 56 GENERAL SPECIFICATIONS GDM-360 Range Resolution Accuracy Overload Protection 600μA 0.1μA Fuse 1: F600mA H 1000V,φ6.35 6000μA 1μA x 31.8mm ±(1.0%+3) 60mA 0.01mA 600mA 0.1mA 0.001A ±(1.2%+5) Fuse 2: F10A H 1000V,φ10.3 x 0.01A 38.1mm Remarks: When ≤ 5A: Continuous measurement is allowed.
  • Page 57 GDM-360/397/398/461 User Manual GDM-461 Range Resolution Accuracy Overload Protection 220μA 0.01μA Fuse 1: F600mA H 1000V,φ6.35 2200μA 0.1μA x 31.8mm ±(0.5%+10) 22mA 0.001mA 220mA 0.01mA 0.001A ±(1.2%+50) Fuse 2: F10A H 1000V,φ10.3 x 38.1mm Remarks: When ≤ 5A: Continuous measurement is allowed.

  • Page 58: Ac Current

    GENERAL SPECIFICATIONS AC Current GDM-397/398 Range Resolution Accuracy Overload Protection 45Hz~400Hz 400μA 0.1μA ±(1.2%+5) Fuse 1: F600mA H 1000V,φ 4000μA 1μA 6.35 x 31.8mm 40mA 0.01mA ±(1.5%+5) 400mA 0.1mA 0.001A ±(2.0%+5) Fuse 2: F10A H 1000V,φ10.3 x 0.01A 38.1mm Remarks: When ≤5A: Continuous measurement is allowed.
  • Page 59 GDM-360/397/398/461 User Manual GDM-360 Range Resolution Accuracy Overload Protection 45~1kHz 1kHz~3kHz 600μA 0.1μA Fuse 1: F600mA H 1000V,φ ±(1.2%+5) ±(1.5%+5) 6000μA 1μA 6.35 x 31.8mm 60mA 0.01mA ±(1.5%+5) ±(2.0%+5) 600mA 0.1mA 0.001A Fuse 2: F10A H 1000V,φ10.3 x ±(2.0%+5) ±(3.0%+5) 0.01A...
  • Page 60 GENERAL SPECIFICATIONS GDM-461 Range Resolution Accuracy Overload Protection 45~1kHz >1kHz~10kHz 220μA 0.01μA Fuse 1: F600mA H ±(0.8%+10) ±(1.2%+50) 2200μA 0.1μA 1000V,φ6.35 x 22mA 0.001mA 31.8mm ±(1.2%+10) ±(1.5%+50) 220mA 0.01mA Fuse 2: F10A H >1kHz~5kHz 0.001A ±(1.5%+10) 1000V,φ10.3 x ±(2.0%+50) 38.1mm Remarks: When ≤...

  • Page 61: Resistance

    GDM-360/397/398/461 User Manual Resistance GDM-397/398 Range Resolution Accuracy Overload Remark Protection 400Ω 0.1Ω ±(1.2%+2) When measuring below 2kΩ, apply 4kΩ 0.001kΩ 40kΩ 0.01kΩ ±(1.0%+2) 1000V dc / to ensure ac (Vpp) 400kΩ 0.1kΩ measurement accuracy. 4MΩ 0.001MΩ ±(1.2%+2) 40MΩ 0.01MΩ...
  • Page 62 GENERAL SPECIFICATIONS GDM-360 Range Resolution Accuracy Overload Remark Protection 600Ω 0.1Ω ±(1.2%+2) When measuring below 2kΩ, apply 6kΩ 0.001kΩ 60kΩ 0.01kΩ ±(1.0%+2) 1000V dc / to ensure ac (Vpp) 600kΩ 0.1kΩ measurement accuracy. 6MΩ 0.001MΩ ±(1.2%+2) 60MΩ 0.01MΩ ±(1.5%+2)
  • Page 63 GDM-360/397/398/461 User Manual GDM-461 Range Resolution Accuracy Overload Remark Protection 220Ω 0.01Ω When measuring below 2kΩ, apply 2.2kΩ 0.0001kΩ ±(0.5%+10) 22kΩ 0.001kΩ to ensure 1000V dc / 220kΩ 0.01kΩ measurement ac (Vpp) accuracy. 2.2MΩ 0.0001MΩ ±(0.8%+10) 22MΩ 0.001MΩ ±(1.5%+10) 220MΩ...

  • Page 64: Capacitance

    GENERAL SPECIFICATIONS Capacitance GDM-397/398 Range Resolution Accuracy Overload Remark Protection 40nF 0.01nF There is around 10nF residual 400nF 0.1nF ±(3.0%+5) reading when the 4μF 0.001μF 1000V dc / circuit is open 40μF 0.01μF ac (Vpp) 400μF 0.1μF ±(4.0%+5) 4000μF 1μF unspecified...
  • Page 65 GDM-360/397/398/461 User Manual GDM-360 Range Resolution Accuracy Overload Remark Protection 40nF 0.01nF There is around 10nF residual 400nF 0.1nF ±(3.0%+5) reading when the 4μF 0.001μF 1000V dc / circuit is open 40μF 0.01μF ac (Vpp) 400μF 0.1μF ±(4.0%+5) 4000μF 1μF...
  • Page 66 GENERAL SPECIFICATIONS GDM-461 Range Resolution Accuracy Overload Remark Protection 22nF 0.001nF There is around 50pF residual 220nF 0.01nF ±(3.0%+5) reading when the 2.2μF 0.0001μF circuit is open. 22μF 0.001μF 1000V dc / 220μF 0.01μF ±(4.0%+5) To measure a small ac (Vpp) 2.2mF 0.0001mF value of...

  • Page 67: Frequency

    GDM-360/397/398/461 User Manual Frequency Model Range Accuracy Maximum Resolution GDM-397/398/360 10Hz~10MHz ±(0.1%+4) 0.01Hz GDM-461 10Hz~220MHz ±(0.01%+5) 0.001Hz Overload Protection: 1000Vdc/ ac (Vpp)  Input Amplitude: (DC offset is zero)   GDM-360/397/398: When 10Hz ~ 10MHz: 200mV ≤a ≤ 30Vrms GDM-461: ...

  • Page 68: Diode Test

    GENERAL SPECIFICATIONS Diode Test Model Resolution Remarks Overload Protection GDM-360/397/398 0.001V Open circuit voltage 1000Vdc / ac (Vpp) around 2.8V GDM-461 0.0001V Continuity Test Model Resolution Overload Protection GDM-360/397/398 0.1Ω 1000Vdc / ac (Vpp) GDM-461 0.01Ω GDM-360/397/398:  Open circuit voltage is around 0.45V.

  • Page 69: Temperature Measurement (Gdm-397 Only)

    GDM-360/397/398/461 User Manual Temperature Measurement (GDM-397 only) Range Resolution Accuracy Overload Protection (-40~-20˚C): -(8%+5) (＞-20~0˚C): ±(1.2%+4) ˚C 1˚C (＞0~100˚C): ±(1.2%+3) (＞100~1000˚C): ±(2.5%+2) 1000Vdc / ac (Vpp) (-40~4˚F): -(8%+6) (＞4~32˚F): ±(1.2%+5) ˚F 1˚F (＞32~212˚F): ±(1.2%+4) (＞212~1832˚F): ±(2.5%+3) Thermocouple:  It is suitable to use K-type thermocouples. The included K-type thermocouple can only be used to measure temperatures less than 230˚C.

  • Page 70: Maintenance

    MAINTENANCE AINTENANCE This section provides basic maintenance information including battery and fuse replacement instructions. Warning Do not attempt to repair or service your Meter unless you are qualified to do so and have the relevant calibration, performance test, and service information. To avoid electrical shock or damage to the Meter, do not get water inside the case.

  • Page 71: Replacing The Battery

    GDM-360/397/398/461 User Manual Do not use or store the Meter in a place of humidity, high temperature or in the  presence of explosives, inflammable materials and strong magnetic fields. Replacing the Battery figure 12...
  • Page 72 MAINTENANCE Warning To avoid false readings, which could lead to possible electric shock or personal injury, replace the battery as soon as the battery indicator “ ” appears. Make sure the test leads are disconnected from the circuit being tested before opening the case bottom.
  • Page 73 GDM-360/397/398/461 User Manual Replacing the Fuses figure 13...
  • Page 74 MAINTENANCE Warning To avoid electrical shock or arc blast, or personal injury or damage to the Meter, use specified fuses ONLY in accordance with the following procedure. To test the fuse: (See figure 13) If the Meter does not respond when measuring current or transistor hFE, inspect to see that the fuses aren’t broken.
  • Page 75 7. Rejoin the tilt stand, battery compartment and case bottom, and reinstall the screw. USB and RS232C Serial Port USB is optional at extra cost. Please refer to the “Installation Guide & Computer Interface Software” for installing and operating instructions for the GDM-360/397/461 Interface Program.

This manual is also suitable for:

Gdm-397Gdm-398Gdm-461

Table of Contents