Gw-instek GDM-350A User Manual

1Page345710111213131517202225TitleOverviewUnpacking InspectionSafety InformationRules For Safe OperationInternational Electrical SymbolsThe Meter stru

10Continuity TestAC CurrentDC Current Double Insulated.Low Battery.Diode.Fuse.Safety RulesConforms to Standards of European Union.Earth GroundAC or

11The Meter Structure (figure 1)1) LCD Display2) HOLD Button3) Display Backlight Button4) Rotary Switch5) COM Input Terminal6)

12Below table indicated for information about the functional button operations.Button Operation PerformedHOLD buttonl Press BLUE butto

13A. DC Voltage Measurement (see figure 2)WarningTo avoid harms to you or damages to the Meter from electric shock, please donot attempt to measure v

14Notel If the value of voltage to be measured is unknown, use the maximum measurement position (500V) and reduce the range step by step until a

15Measurement Operation (3)B. AC Voltage Measurement (see figure 2)WarningTo avoid harms to you or damages to the Meter from electric shock, please

16Measurement Operation (4)Notel If the value of voltage to be measured is unknown, use the maximum measurement position (500V) and reduce the r

17C. DC Current Measurement (see figure 3)Never attempt an in-circuit currentmeasurement where the voltage betweenterminals and ground is greater th

18The current measurement has 4 measurement positions on the rotary switch:2000µA, 20mA, 200mA and 10ATo measure current, do the following:1. Turn o

19Notel If the value of current to be measured is unknown, use the maximum measurement position (10A)l and reduce the range step by step until a

2Table of Contents (2)General SpecificationsAccuracy SpecificationsA. DC VoltageB. AC CurrentC. DC CurrentD. ResistanceE. Diodes and Continuity

20D. Measuring Resistance (see figure 4)( figure 4)WarningTo avoid damages to the Meter or to thedevices under test, disconnect circuitpower and disc

211. Insert the red test lead into the VΩmA terminal and the black test lead into the COM terminal.2. Set the rotary switch to an appropri

22between the testing leads and the circuit under test.E. Diodes and Continuity Measurement (see figure 5)( figure 5)Testing DiodesTo avoid amages

23across the junction. A good silicon junctiondrops between 0.5V and 0.8V.To test a diode out of a circuit, connect the Meter as follows:1. Insert

24l Connect the test leads to the proper terminals as said above to avoid error display. The LCD will display “1” indicating open-circuit for wr

25l When continuity testing has been completed, disconnect the connection between the testing leads and the circuit under test.Measurement Opera

262. Set the rotary switch to oC or oF.3. Place the temperature probe to the object being measured.The measured value shows on the display.Notel

27l Maximum Voltage (including transient overvoltage) between any Terminals and Grounding: 500V rms.l Fused Protection for VΩmA Input Terminal

28l Altitude:Operating: 2000 m.Storage: 10000 m.l Battery Type: One piece of 9V Battery NEDA 1604 or 6F22 or 006P.l Battery Deficiency: Display: .

29Accuracy: (a% reading + b digits), guarantee for 1 year.Operating temperature: 23oC 5oC.Relative humidity: <75%.Temperature coefficient: 0.1

3OverviewThis Operating Manual covers information on safety and cautions. Please readthe relevant information carefully and observe all the Warnings a

30B. AC VoltageRemarks:l Input impedance: approx. 5MΩ.l Displays effective value of sine wave (mean value response).l Frequency response 40Hz ~ 400

31Accuracy Specifications(3)C. DC CurrentRemark:l At 10A Range: For continuous measurement 10 seconds and interval not less than 15 minutes

32D. ResistanceAccuracy Specifications(4) Range Resolution200Ω2000Ω20kΩ200kΩ20MΩ AccuracyOverloadProtection0.1Ω1Ω10Ω100Ω10kΩ(0.8%+5)(1%+5

33E. Diodes and Continuity MeasurementF. The Model GDM-350A: Temperature1Ω Buzzer beeps at <70ΩRange Resolution

34This section provides basic maintenance information including battery and fusereplacement instruction.A. General Servicel Periodically wipe the ca

35l Do not store the Meter in a place of humidity, high temperature, explosive, inflammable and strong magnetic field.B. Replacing the Battery

362. Turn the Meter to OFF position.3. Remove the screw from case bottom, and separate the case bottom from the case top.4. Remove the b

373. Remove the screw from case bottom, and separate the case bottom from the case top.4. Remove the fuse by gently prying one end loose,

4Open the package case and take out the Meter. Check the following items carefullyto see any missing or damaged part:In the event you find any missin

5Safety Information(1)Safety InformationThis Meter complies with the standards IEC61010: in pollution degree 2, overvoltagecategory (CAT I 600V, CAT I

6Safety Information(2)In this manual, a Warning identifies conditions and actions that pose hazards to theuser, or may damage the Meter or the equipme

7l 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. Look for crack

8 prevent damage of the Meter.l When the Meter working at an effective voltage over 60V in DC or 42V rms in AC, special care should be tak

9l Remove test leads and temperature probe from the Meter and turn the Meter power off before opening the Meter case.l When servicing the Meter,