GW Instek GDM-356 User Manual
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GW Instek GDM-356 User Manual

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Title
Measuring Diodes & Continuity
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GDM-356
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Summary of Contents for GW Instek GDM-356

  • Page 1: Table Of Contents

    GDM-356 Table of Contents Page Title Overview Unpacking Inspection Safety Information Rules For Safe Operation International Electrical Symbols The multimeter Structure Functional Buttons Display Symbols Measurement Operation DC Voltage Measurement AC Voltage Measurement DC Current Measurement AC Current Measurement Measuring Resistance...
  • Page 2 GDM-356 Title Page Resistance Test Frequency Temperature Capacitance Diodes and Continuity Test Maintenance General Service Replacing the Battery Replacing the Fuses...

  • Page 3: Overview

    To avoid electric shock or personal injury, read the "Safety Information" and "Rules for Safe Operation" carefully before using the Meter. Digital Multimeters Model GDM-356 (hereafter referred to as “the Meter”) are 3 1/2 digits with steady operations, fashionable structure and highly reliable hand-held measuring instrument.

  • Page 4: Unpacking Inspection

    GDM-356 Unpacking Inspection Open the package case and take out the Meter. Check the following items carefully to see any missing or damaged part: Item Description 1 piece English Operating Manual 1 pair Test Lead 1 pair Test Clip Point Contact Temperature Probe...

  • Page 5: Safety Information

    GDM-356 Safety Information This Meter complies with the standards IEC61010: in pollution degree 2, overvoltage category (CAT. II 1000V, CAT. III 600V) and double insulation. CAT. II: Local level, appliance, PORTABLE EQUIPMENT etc., with smaller transient voltage overvoltages than CAT. III CAT.

  • Page 6: Rules For Safe Operation

    GDM-356 Rules For Safe Operation (1) 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: l Before using the Meter inspect the case. Do not use the Meter if it is damaged or the case (or part of the case) is removed.
  • Page 7 GDM-356 Rules For Safe Operation (2) l Disconnect circuit power and discharge all high- voltage capacitors before testing resistance, continuity, diodes, capacitance or current. l Before measuring current, check the Meter’s fuses and turn off power to the circuit before connecting the Meter to the circuit.

  • Page 8: International Electrical Symbols

    GDM-356 International Electrical Symbols AC (Alternating Current). DC (Direct Current). AC or DC. Grounding. Double Insulated. Deficiency of Built-In Battery. Continuity Test. Diode. Capacitance Test. Fuse. Warning. Refer to the Operating Manual. Conforms to Standards of European Union.

  • Page 9: The Multimeter Structure

    GDM-356 The multimeter Structure (see figure 1) ( figure 1)

  • Page 10: Functional Buttons

    GDM-356 Functional Buttons Below table indicated for information about the functional button operations Button Operation Performed POWER (Yellow Button) HOLD (Blue Button)

  • Page 11: Display Symbols

    GDM-356 Display Symbols (see figure 2) ( figure 2) Symbol Meaning Dangerous Voltages. 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 12 GDM-356 Display Symbols (see figure 2) Symbol Meaning nF, µF F: Farad. The unit of capacitance. µF: Microfarad.1 x 10 or 0.000001 farads. nF: Nanofarad. 1 x 10 or 0.000000001 farads. The unit of frequency in cycles/ second. Kilohertz. 1 x 10 1,000 hertz.

  • Page 13: Measurement Operation

    Measurement Operation(1) A. DC Voltage Measurement (see figure 3) ( figure 3) Warning To avoid harms to you or damages to the Meter from electric shock, please do not attempt to measure voltages higher than 1000V or 750V rms although readings may be obtained.

  • Page 14: Ac Voltage Measurement

    GDM-356 Measurement Operation(2) Note l If the value of voltage to be measured is unknown, use the maximum measurement position (1000V) and reduce the range step by step until a satisfactory reading is obtained. l The LCD displays "1"indicating the existing selected range is overloaded, it is required to select a higher range in order to obtain a correct reading.
  • Page 15 GDM-356 Measurement Operation(3) The AC voltage measurement has 4 measurement positions on the rotary switch: 2V, 20V, 200V and 750V To measure AC Voltage, connect the Meter as follows: Insert the red test lead into the VΩ terminal and the black test lead into the COM terminal.

  • Page 16: Dc Current Measurement

    GDM-356 Measurement Operation(4) C. DC Current Measurement (see figure 5) ( figure 5) Warning Never attempt an in-circuit current measurement where the open circuit voltage between terminals and ground is greater than 60V DC or 30V rms. If the fuse burns out during measurement, the Meter may be damaged or the operator himself may be hurt.

  • Page 17: Ac Current Measurement

    GDM-356 Measurement Operation(5) Insert the red test lead into the µAmA or 20A terminal and the black test lead into the COM terminal. 3. Set the rotary switch to an appropriate measurement position in A range. 4. Break the current path to be tested. Connect the red...
  • Page 18 GDM-356 Measurement Operation(6) Warning Never attempt an in-circuit current measurement where the voltage between terminals and ground is greater than 60V. If the fuse burns out during measurement, the Meter may be damaged or the operator himself may be hurt.

  • Page 19: Measuring Resistance

    GDM-356 Measurement Operation(7) E. Measuring Resistance (see figure 7) black ( figure 7) Warning To avoid damages to the Meter or to the devices under test, disconnect circuit power and discharge all the high-voltage capacitors before measuring resistance. The resistance ranges are: Ω...

  • Page 20: Frequency Measurement

    GDM-356 Measurement Operation(8) measured resistance value (Y) – (X) = precision readings of resistance. l For high resistance (>1MΩ), it is normal taking several seconds to obtain a stable reading. l When there is no input, for example in open circuit condition, the Meter displays “1”.

  • Page 21: Temperature Measurement

    GDM-356 Measurement Operation(9) Note l When Hz measurement has been completed, disconnect the connection between the testing leads and the circuit under test. G. Temperature Measurement (see figure 9) ( figure 9) Warning To avoid harm to you or damages to the Meter, do...

  • Page 22: Capacitance Measurement

    GDM-356 Measurement Operation(10) l The included temperature probe can only be measured up to 250 C For any mesaurement higher than that, the rod type temperature probe must be used instead. l When temperature measeuremnet has been completed, disconnect the connection between the testing leads and te circuit under test.
  • Page 23 GDM-356 Measurement Operation(11) Note l For testing the capacitor with polarity, connect the red test lead to anode & black test lead to cathode l When the tested capacitor is shorted or the capacitor value is overloaded, the LCD display “1”.

  • Page 24: Testing For Continuity

    GDM-356 Measurement Operation(12) Note l In a circuit, a good diode should still produce a forward voltage drop reading of 0.5V to 0.8V; however; the reverse voltage drop reading can vary depending on the resistance of other pathways between the probe tips.

  • Page 25: Sleep Mode

    GDM-356 Sleep Mode Turning on the Auto Display Backlight The Meter has a built-in sensor. Therefore the Display Backlight turns on and off automatically depending on the brightness of the environment. In a dim condition, the Display Backlight turns on automatically while in a...

  • Page 26: General Specifications

    GDM-356 General Specifications l Maximum voltage between Terminals and Grounding : 1000V rms. Fused Protection for mA Input Terminal : 0.5A, 250V fast type, 5x20mm. Fused Protection for 20A Input Terminal : Un-fused. l Range : Manual ranging. l Maximum Display : Display :1999.

  • Page 27: Accuracy Specifications

    GDM-356 Accuracy Specifications(1) Accuracy: (a% reading + b digits),guarantee for 1 year. Operating temperature:23 Relative humidity:<75%. Temperature coefficient: 0.1 x (specified accuracy) / 1 A. DC Voltage Overload Accuracy Range Resolution Protection 250VDCor 200mV 100µV ACrms. (0.5%+1) 1000V DC 10mV...

  • Page 28: Dc Current

    GDM-356 Accuracy Specifications(2) C. DC Current Overload Range Resolution Accuracy Protection 0.5A. 250V 10µA 20mA (0.8%+1) fast type fuse, 5x20 (1.5%+1) 100µA 200mA 10mA (2%+5) Un-Fused Remarks: l At 20A Range: For continuous measurement 10 seconds and interval not less than 15 minutes.

  • Page 29: Resistance Test

    GDM-356 Accuracy Specifications(3) E. Resistance Test Overload Accuracy Range Resolution Protection 0.1Ω (0.8%+3) 200Ω 1Ω 2kΩ 250V DC 10Ω 20kΩ (0.8%+1) or AC rms 100Ω 200kΩ 1kΩ 2MΩ [5%(reading-10)+10] 100kΩ 200MΩ Remarks: l Open circuit voltage: 700mV (At 200MΩ range, it is approx.

  • Page 30: Capacitance

    GDM-356 Accuracy Specifications(4) H. Capacitance Overload Range Resolution Accuracy Protection 10pF 20nF (4%+3) 0.1nF 200nF 250V AC (4%+3) 2µF (5%+4) 0.1µF 100µF Remarks:Testing signal:approx. 400Hz 40mV rms. µ When the tested capacitor is greater than 30 reading is for reference only.

  • Page 31: Maintenance

    GDM-356 Maintenance(1) This section provides basic maintenance information including battery and fuse replacement instruction. 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.

  • Page 32: Replacing The Fuses

    GDM-356 Maintenance(2) 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. To replace battery: 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.
  • Page 33 GDM-356 Maintenance(3) Install ONLY replacement fuses with the identical type and specification as follows and make sure the fuse is fixed firmly in the bracket. 0.5A. 250V fast type fuse, φ5x 20mm. Rejoin the case bottom and the case top, and install the screw and rubber feet Replacement of fuses is seldom required.

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