Handheld Digital Multimeter GDM-360, GDM-397, GDM-398, GDM-461 USER MANUAL GW INSTEK PART NO.
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.
Table of Contents Table of Contents OVERVIEW............................................................................................................................. 4 Unpacking Inspection ....................................................................................................................... 5 Safety Information ............................................................................................................................ 6 Rules for Safe Operation .........................
GDM-360/397/398/461 User Manual MAX MIN button (GDM-360/397/398 only) ................................................................................. 42 Peak Hold (GDM-461 only) ............................................................................................................ 42 Outputting Data (Except GDM-398) .............................................................................................. 43 The Use of Relative Value Mode ..........................................................
Table of Contents Replacing the Fuses ........................................................................................................................ 71 USB and RS232C Serial Port ...........................................................................................................
OVERVIEW OVERVIEW This User Manual covers information on safety and cautions. 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” and “Rules for Safe Operation” carefully before using the Meter. Digital Multimeter Model GDM-360 (True RMS), GDM-397, GDM-398 and GDM461 (True RMS) (hereafter referred to as “the Meter”) are auto ranging multimeters.
GDM-360/397/398/461 User Manual Unpacking Inspection Open the package case and take out the Meter.
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. Use the Meter only as specified in this User Manual, otherwise the protection provided by the Meter may be impaired.
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 if the case (or part of the case) is removed. Look for cracks or missing plastic. Pay attention to the insulation around the connectors.
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. Disconnect circuit power and discharge all high-voltage capacitors before testing resistance, continuity and diodes.
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. The Meter is suitable for indoor use. Turn the Meter off when it is not in use and take out the battery when not using it for a long time.
OVERVIEW The Meter Structure (see figure 1) 1. 2. 3. 4. 5. 6.
GDM-360/397/398/461 User Manual Rotary Switch The table below describes the relevant functions of each of the rotary switch positions.
OVERVIEW Functional Buttons The table below describes what operations are performed for each of the buttons. Button Operation Performed LIGHT (except GDM-461) Press and hold for 2 seconds to turn the display backlight on or off. Hold Press to enter or exit data hold mode. BLUE Button Press to select the alternate function. Yellow (GDM-461) Press the Hz% button (except GDM-461) or the Yellow button(GDMHz% (except GDM-461) 461) for frequency and duty cycle measurement.
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. Press to step the display through Pmax and Pmin readings. Press and hold for 2 seconds to exit Peak mode. “CAL” means the meter has entered self-calibration mode. PEAK (GDM-461) Display Symbols No 1 2 3 4 5 6 Symbol 7 8 9 10 MANU OL AC DC hFE Meaning Data hold is active.
OVERVIEW 11 12 13 MAX/MIN 14 15 16 Ω, kΩ, MΩ V, mV 17 A, mA, µA nF, µF, mF, F 14 The continuity buzzer is on. 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. Sensor test is in progress. The REL function is on.
GDM-360/397/398/461 User Manual ˚C, ˚F Hz, kHz, MHz mF: Milli-farad. 1 x 10-3 or 0.001 farads µF: Microfarad. 1 x 10-6 or 0.000001 farads. nF: Nanofarad. 1 x 10-9 or 0.000000001 farads ˚C: Centigrade. The unit of temperature. ˚F: Fahrenheit. The unit of temperature. Hz: Hertz. The unit of frequency in cycles/second. kHz: Kilohertz. 1 x 103 or 1,000 hertz. MHz: Megahertz. 1 x 106 or1,000,000 hertz.
MEASUREMENT OPERATION MEASUREMENT OPERATION A. DC/AC Voltage Measurement (see figure 2) AV V 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 , V ).
GDM-360/397/398/461 User Manual Warning To avoid injury to your person or damage to the Meter from electric shock, please do not attempt to measure voltages higher than 1000V, although readings may be obtained. When measuring high voltage, take extra care to avoid electric shock. 1. 2. 3. Insert the red test lead into the V terminal and the black test lead into the COM terminal. Set the rotary switch to V; DC measurement is the default or press the BLUE button to switch between DC and AC measurement mode.
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). For GDM-398: When measuring mV, you must press RANGE manually to enter mV range.
GDM-360/397/398/461 User Manual B.
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. When the testing leads are connected to the current terminals, do not connect them in parallel to any circuit. To measure current, do the following: 1.
GDM-360/397/398/461 User Manual 5. GDM-360/461: Displays the true rms value. 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: ≤ 1kHz Note If the value of the current to be measured is unknown, set to the highest range and reduce the range step by step until a satisfactory reading is obtained.
MEASUREMENT OPERATION C.
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. To measure resistance, connect the Meter as follows: 1. 2. 3. 4. Insert the red test lead into the Ω terminal and the black test lead into the COM terminal.
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. If the Ω reading with shorted test leads is not ≤0.5Ω, check to see that the test leads are properly connected and are not loose.
GDM-360/397/398/461 User Manual D.
MEASUREMENT OPERATION Warning To avoid damage to the Meter or to the device under test, disconnect the circuit power and discharge all high-voltage capacitors before testing for continuity. To avoid harm to yourself, do not input voltages greater than DC 60V or AC 30V. To test for continuity, connect the Meter as described below: 1. Insert the red test lead into the Ω terminal and the black test lead into the COM terminal. 2. Set the rotary switch to and press BLUE button to select measurement mode. 3.
GDM-360/397/398/461 User Manual E.
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. 2. 3. Insert the red test lead into the Ω terminal and the black test lead into the COM terminal. Set the rotary switch to and press BLUE button to select the measurement mode.
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. When diode testing has been completed, disconnect the connection between the testing leads and the circuit under test, and remove the testing leads away from the input terminals of the Meter.
MEASUREMENT OPERATION F.
GDM-360/397/398/461 User Manual Warning To avoid damage to the Meter or to the equipment under test, disconnect the circuit power and discharge all high-voltage capacitors before measuring capacitance. Use the DC Voltage function to confirm that the capacitor is discharged. To measure capacitance, connect the Meter as follows: 1. Insert the red test lead into the terminal and the black test lead into the COM terminal. 2. Set the rotary switch to .
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 the maximum range. When capacitance measurement has been completed, disconnect all the connections between the multi-purpose socket, capacitor and the Meter.
GDM-360/397/398/461 User Manual G. Frequency Measurement GDM-360/397/398 (see figure 8) 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 COM terminal.
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. The measured value shows on the display. 4.
GDM-360/397/398/461 User Manual H.
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. Place the temperature probe to the object being measured. After few seconds, the measured value shows on the display. 4. Press BLUE button to toggle between ˚C and ˚F temperature.
GDM-360/397/398/461 User Manual I.
MEASUREMENT OPERATION 1. 2. 3. 4. Set the rotary switch to hFE. Insert the multi-purpose socket into the input terminal as shown on figure 10. Insert the transistor to be tested into the corresponding multi-purpose socket jacks. The LCD will display hFE nearest value. Note 38 When transistor measurement has been completed, disconnect all the connections between the multi-purpose socket, transistor and the Meter.
GDM-360/397/398/461 User Manual J.
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. 3. Place the front part of the housing with the being measured. There will be three types of displays: marking towards the object LCD displays different size of digits to represent the strength of detected signal. When the LCD displays OL, the buzzer beeps and the red LED blinks.
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. Press HOLD to enter Hold mode; the Meter beeps. Press HOLD again to exit Hold mode; the Meter beeps. In Hold mode, is displayed.
MEASUREMENT OPERATION RANGE button Press RANGE to enter the manual ranging mode; the Meter beeps. Press RANGE to step through the ranges available for the selected function; the Meter beeps. 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.
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. Outputting Data (Except GDM-398) Press and hold the REL USB 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. If a new measurement value is equal to the stored value then the reading would be 0.0V.
GDM-360/397/398/461 User Manual 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. Press and hold the HOLD/LIGHT button (yellow button) for over 2 seconds to turn the display backlight on.
GENERAL SPECIFICATIONS GENERAL SPECIFICATIONS Maximum Voltage between any Terminals and Ground: Refer to the different input ranges for the protection voltages. Fused Protection for μAmA Input Terminal: 600mAH 1000V φ6.35x31.8mm. Fused Protection for 10A Input Terminal: 10A H 1000V φ10.3x38.1mm.
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 ≤50% @ 30˚C - 40˚C. Battery Type: 9V (NEDA1604 or 6F22 or 006P). Under the presence of electromagnetic fields, the instrument may have measurement errors. Measurement will return to normal when the interference is removed.
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 400mV 4V 40V 400V 1000V 48 0.01mV 0.1mV 0.001V 0.01V 0.1V 1V ±(0.8%+3) Around >3000MΩ ±(0.8%+3) ±(0.5%+1) ±(1.
GDM-360/397/398/461 User Manual GDM-360 Range 60mV 600mV 6V 60V 600V 1000V Resolution 0.01mV 0.1mV 0.001V 0.01V 0.1V 1V Accuracy ±(0.8%+3) ±(0.8%+3) Resolution 0.01mV 0.0001V 0.001V 0.01V 0.1V Accuracy ±(0.1%+5) ±(0.5%+1) Input Impedance Fixed Value Input Around >3000MΩ 1000V dc/ac (Vpp) Around 10MΩ ±(1.0%+3) GDM-461 Range 220mV 2.2V 22V 220V 1000V ±(0.1%+2) Input Impedance Fixed Value Input Around >3000MΩ Around 10MΩ 1000V dc/ac (Vpp) ±(0.
GENERAL SPECIFICATIONS AC Voltage GDM-397/398 Range Resolution Accuracy 45~400Hz Input Impedance Fixed Value Input GDM-398 GDM-397 40mV 400mV 4V 40V 400V 750V 50 0.01mV 0.1mV 0.001V 0.01V 0.1V 1V ±(1.2%+5) Around >3000MΩ ±(1.0%+3) Around 10MΩ 1000V dc/ 750Vrms ac ±(1.2%+5) Displays effective value of a sine wave. mV range is applicable from 5% of range to 100% of range.
GDM-360/397/398/461 User Manual GDM-360 Range 60mV 600mV 6V 60V 600V 750V Resolution Accuracy 45~1kHz 0.01mV ±(1.2%+5) 0.1mV 0.001V ±(1.0%+3) 0.01V 0.1V 1V ±(1.2%+5) >1kHz~3kHz ±(2.0%+5) Input Impedance Around >3000MΩ ±(1.5%+5) Around 10MΩ Fixed Value Input 1000V dc/ 750Vrms ac ±(3.0%+5) GDM-360: True RMS is applicable from 10% of range to 100% of range. AC crest factor can be up to 3.0 except 750V where it is 1.5.
GENERAL SPECIFICATIONS GDM-461 Range 220mV Resolution Accuracy 45~1kHz 0.01mV ±(1.0%+10) 2.2V 22V 220V 750V 0.0001V 0.001V 0.01V 0.1V ±(0.8%+10) ±(1.2%+10) >1kHz~10kHz ±(1.5%+50) Input Impedance Around >3000MΩ ±(1.2%+50) ±(2.0%+50) ±(3.0%+50) Around 10MΩ Fixed Value Input 1000V dc/ 750Vrms ac True RMS is applicable from 10% of range to 100% of range. AC crest factor can be up to 3.0 except 750V where it is 1.5.
GDM-360/397/398/461 User Manual DC Current GDM-397/398 Range 400μA 4000μA 40mA 400mA 4A 10A Remarks: Resolution 0.1μA 1μA 0.01mA 0.1mA 0.001A 0.01A Accuracy ±(1.0%+2) Overload Protection Fuse 1: F600mA H 1000V,φ6.35 x 31.8mm ±(1.2%+3) ±(1.5%+3) Fuse 2: F10A H 1000V,φ10.3 x 38.1mm When ≤5A: Continuous measurement is allowed. When >5A: Continuous measurement for less than 10 seconds with intervals of more than 15 minutes between measurements.
GENERAL SPECIFICATIONS GDM-360 Range 600μA 6000μA 60mA 600mA 6A 10A Remarks: Resolution 0.1μA 1μA 0.01mA 0.1mA 0.001A 0.01A Accuracy ±(1.0%+3) ±(1.2%+5) Overload Protection Fuse 1: F600mA H 1000V,φ6.35 x 31.8mm Fuse 2: F10A H 1000V,φ10.3 x 38.1mm When ≤ 5A: Continuous measurement is allowed. When > 5A: Continuous measurement for less than 10 seconds with intervals of more than 15 minutes between measurements.
GDM-360/397/398/461 User Manual GDM-461 Range 220μA 2200μA 22mA 220mA 10A Resolution 0.01μA 0.1μA 0.001mA 0.01mA 0.001A Accuracy ±(0.5%+10) ±(1.2%+50) Overload Protection Fuse 1: F600mA H 1000V,φ6.35 x 31.8mm Fuse 2: F10A H 1000V,φ10.3 x 38.1mm Remarks: When ≤ 5A: Continuous measurement is allowed. When > 5A: Continuous measurement for less than 10 seconds with intervals of more than 15 minutes between measurements.
GENERAL SPECIFICATIONS AC Current GDM-397/398 Range Resolution 400μA 4000μA 40mA 400mA 4A 10A Remarks: 0.1μA 1μA 0.01mA 0.1mA 0.001A 0.01A Accuracy 45Hz~400Hz ±(1.2%+5) Overload Protection Fuse 1: F600mA H 1000V,φ 6.35 x 31.8mm ±(1.5%+5) ±(2.0%+5) Fuse 2: F10A H 1000V,φ10.3 x 38.1mm When ≤5A: Continuous measurement is allowed. When > 5A: Continuous measurement for less than 10 seconds with intervals of more than 15 minutes between measurements.
GDM-360/397/398/461 User Manual GDM-360 Range 600μA 6000μA 60mA 600mA 6A 10A Remarks: Resolution Accuracy 45~1kHz 0.1μA ±(1.2%+5) 1μA 0.01mA ±(1.5%+5) 0.1mA 0.001A ±(2.0%+5) 0.01A Overload Protection 1kHz~3kHz ±(1.5%+5) Fuse 1: F600mA H 1000V,φ 6.35 x 31.8mm ±(2.0%+5) ±(3.0%+5) Fuse 2: F10A H 1000V,φ10.3 x 38.1mm When ≤ 5A: Continuous measurement is allowed. When > 5A: Continuous measurement for less than 10 seconds with intervals of more than 15 minutes between measurements.
GENERAL SPECIFICATIONS GDM-461 Range Resolution 220μA 2200μA 22mA 220mA 0.01μA 0.1μA 0.001mA 0.01mA 10A 0.001A Accuracy 45~1kHz >1kHz~10kHz ±(0.8%+10) ±(1.2%+50) ±(1.2%+10) ±(1.5%+50) ±(1.5%+10) Overload Protection >1kHz~5kHz ±(2.0%+50) Fuse 1: F600mA H 1000V,φ6.35 x 31.8mm Fuse 2: F10A H 1000V,φ10.3 x 38.1mm Remarks: When ≤ 5A: Continuous measurement is allowed. When > 5A: Continuous measurement for less than 10 seconds with intervals of more than 15 minutes between measurements.
GDM-360/397/398/461 User Manual Resistance GDM-397/398 Range Resolution Accuracy 400Ω 4kΩ 40kΩ 400kΩ 4MΩ 40MΩ 0.1Ω 0.001kΩ 0.01kΩ 0.1kΩ 0.001MΩ 0.01MΩ ±(1.2%+2) ±(1.0%+2) ±(1.2%+2) ±(1.5%+2) Overload Protection 1000V dc / ac (Vpp) Remark When measuring below 2kΩ, apply REL to ensure measurement accuracy.
GENERAL SPECIFICATIONS GDM-360 Range Resolution Accuracy 600Ω 6kΩ 60kΩ 600kΩ 6MΩ 60MΩ 0.1Ω 0.001kΩ 0.01kΩ 0.1kΩ 0.001MΩ 0.01MΩ ±(1.2%+2) 60 ±(1.0%+2) ±(1.2%+2) ±(1.5%+2) Overload Protection 1000V dc / ac (Vpp) Remark When measuring below 2kΩ, apply REL to ensure measurement accuracy.
GDM-360/397/398/461 User Manual GDM-461 Range Resolution 220Ω 2.2kΩ 22kΩ 220kΩ 2.2MΩ 22MΩ 220MΩ 0.01Ω 0.0001kΩ 0.001kΩ 0.01kΩ 0.0001MΩ 0.001MΩ 0.01MΩ Accuracy Overload Protection ±(0.5%+10) ±(0.8%+10) ±(1.5%+10) ±(3.0%+50) 1000V dc / ac (Vpp) Remark When measuring below 2kΩ, apply REL to ensure measurement accuracy.
GENERAL SPECIFICATIONS Capacitance GDM-397/398 Range Resolution 40nF 400nF 4μF 40μF 400μF 4000μF 0.01nF 0.1nF 0.001μF 0.01μF 0.1μF 1μF 62 Accuracy ±(3.0%+5) ±(4.
GDM-360/397/398/461 User Manual GDM-360 Range Resolution 40nF 400nF 4μF 40μF 400μF 4000μF 0.01nF 0.1nF 0.001μF 0.01μF 0.1μF 1μF Accuracy ±(3.0%+5) Overload Protection 1000V dc / ac (Vpp) Remark There is around 10nF residual reading when the circuit is open ±(4.
GENERAL SPECIFICATIONS GDM-461 Range Resolution 22nF 220nF 2.2μF 22μF 220μF 2.2mF 22mF 220mF 0.001nF 0.01nF 0.0001μF 0.001μF 0.01μF 0.0001mF 0.001mF 0.01mF 64 Accuracy Overload Protection There is around 50pF residual reading when the circuit is open. ±(3.0%+5) ±(4.0%+5) unspecified Remark 1000V dc / ac (Vpp) To measure a small value of capacitance, use REL to ensure accuracy.
GDM-360/397/398/461 User Manual Frequency Model GDM-397/398/360 GDM-461 Range 10Hz~10MHz 10Hz~220MHz Accuracy ±(0.1%+4) ±(0.01%+5) Maximum Resolution 0.01Hz 0.
GENERAL SPECIFICATIONS Diode Test Model Resolution GDM-360/397/398 0.001V GDM-461 0.0001V Remarks Overload Protection Open circuit voltage 1000Vdc / ac (Vpp) around 2.8V Continuity Test Model Resolution GDM-360/397/398 0.1Ω GDM-461 0.01Ω Overload Protection 1000Vdc / ac (Vpp) GDM-360/397/398: Open circuit voltage is around 0.45V. Broken circuit resistance value is around > 35Ω, the buzzer does not beep. Good circuit resistance value is ≤10Ω, the buzzer beeps continuously.
GDM-360/397/398/461 User Manual Temperature Measurement (GDM-397 only) Range Resolution ˚C 1˚C ˚F 1˚F Accuracy (-40~-20˚C): -(8%+5) (＞-20~0˚C): ±(1.2%+4) (＞0~100˚C): ±(1.2%+3) (＞100~1000˚C): ±(2.5%+2) (-40~4˚F): -(8%+6) (＞4~32˚F): ±(1.2%+5) (＞32~212˚F): ±(1.2%+4) (＞212~1832˚F): ±(2.5%+3) Overload Protection 1000Vdc / ac (Vpp) 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.
MAINTENANCE MAINTENANCE 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. General Service Periodically wipe the case with a damp cloth and mild detergent. Do not use abrasives or solvents.
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.
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. To replace the battery: (See figure 12) 1. Turn the Meter power off and remove all connections from the terminals. 2.
GDM-360/397/398/461 User Manual Replacing the Fuses figure 13 71
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. To replace the Meter’s fuse: (See figure 12) 1. 2. 3. 4. 5. 72 Turn the Meter power off and remove all the connections from the terminals.
GDM-360/397/398/461 User Manual 6. 7. 10A range: F2, 10A H 1000V,φ10.3x38.1mm. (CE) Rejoin the case bottom and case top, and reinstall the screw. 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.
