NDT DHT- 200Plus Instruction Manual
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NDT DHT- 200Plus Instruction Manual

Portable hardness tester
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PORTABLE HARDNESS TESTER
Plus
DHT- 200
INSTRUCTION MANUAL
V1.0.0

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Summary of Contents for NDT DHT- 200Plus

  • Page 1 PORTABLE HARDNESS TESTER Plus DHT- 200 INSTRUCTION MANUAL V1.0.0...

  • Page 2: Table Of Contents

    CONTENTS 1.Summary ................1 2. Principle of Leeb hardness testing method ......1 2.1 History of Leeb hardness testing method ........1 2.2 Definition of Leeb hardness ............1 2.3 Available Functions ..............2 2.4 Symbol of Leeb’s hardness values ..........2 3.
  • Page 3 6.4.3 Print file settings ................. 11 6.4.4 Delete file settings ............... 12 6.5 Other settings ................ 13 6.5.1 Date and Time settings ..............13 6.5.2 Tolerance settings ............... 13 6.5.3 Calibration settings..............14 6.5.4 Auto shutdown settings .............. 14 6.5.5 LCD brightness settings ............... 15 6.5.6 Key sound settings...............

  • Page 4: Summary

    PLUS Hardness Tester DHT-200 1. Summary PLUS DHT-200 Leeb hardness tester, based on the principle of Leeb theory, can be used for hardness testing of various metals. With the feature of compact size, it is suitable for working on various circumstances. The Leeb hardness values can be easily converted to HRC, HRB, HV, HS and so on.

  • Page 5: Available Functions

    PLUS Hardness Tester DHT-200 Figure 1 Voltage features of output signal The Leeb hardness values can be converted to other hardness scales directly, such as HV, HRC, HRB, HB and HS. 2.3 Available Functions ●320×240 matrix TFT Color LCD ●Auto connects to 32 bits / 64 bits computer system. ●100 files x 100 data can be stored.

  • Page 6: Pre-Treatment Of Work Piece

    PLUS Hardness Tester DHT-200 3. Pre-treatment of work piece To get the accurate measuring results, pre-treatment of work piece is required. 3.1 Work piece surface Temperature of work piece should be less than 80 ； The surface roughness requirements are listed in table 3.1.1 Table: 3.1.1 Impact Device Work piece of surface roughness...

  • Page 7: No Strong Magnetism On The Work Piece Surface

    PLUS Hardness Tester DHT-200 Tale: 3.3.1 Impact device Minimum depth of surface hardened layer 0.8mm D, DC, D＋15 0.2mm 3.4 No strong magnetism on the work piece surface Strong magnetism will affect the circuit winding greatly, and affect the accuracy of testing results, so it is required to avoid strong magnetism during testing.

  • Page 8: Functions Of Dht-200Plus

    PLUS Hardness Tester DHT-200 5. Functions of DHT-200 PLUS 5.1 Technical specifications Display: 320×240 matrix TFT Color LCD display Meas. Range: HL 174-900 HRC 19.6-68.0 HRB 13.5-101.7 HS 32.5-99.5 HB 20-655 HV 80-940 Error 0.5%(HL＝800), Repeatability 0.5% Display accuracy: Memory: 100 customized files X 100 data/each file Power: 4 AA rechargeable batteries,...

  • Page 9: Display Area

    PLUS Hardness Tester DHT-200 5.2.2 Display area Prompt: Press the to change to big digital display. 7 Power indication 8 Work piece mark 9 Print indication 10 Impact device type 11 Max value of testing result 12 Min. value of testing result 13 Avg.

  • Page 10: Keypad

    PLUS Hardness Tester DHT-200 5.2.3 Keypad 1.Power key 1.Power on or off the instrument 1.Left Key 1.Adjust the menu items 2.Work piece mark key 2.In measuring status, adjust the mark of work piece (ABCDE) 1.Right key 1.Adjust the menu items 2.Work piece mark key 2.In measuring status, adjust the mark of work piece (ABCDE)

  • Page 11: Operation Instruction

    PLUS Hardness Tester DHT-200 6. Operation instruction 6.1 Power on Fit on the impact device firstly, press key to power on. The following information is displayed. 1. Instrument model, Series No., Software version 2. Parameters of last setting ： Prompt If the impact device is not fitted properly, the instrument will not be able to complete self-checking and will give out the Notice.

  • Page 12: Material And Hardness Scales Settings

    PLUS Hardness Tester DHT-200 -Press the key and the key to enter MEASURE- DIRECTION. -Press the key to enter this item, -Press the key or key for setting, -Press the key to confirm. Prompt: During measurements, the actual impacting direction must conform to the one selected.

  • Page 13: Average Times Settings

    PLUS Hardness Tester DHT-200 6.3.3 Average times settings It is extremely necessary to work out the average measuring values in leeb's hardness testing. Different measuring times between 2~8 are selected according to users’ different requirements. - Press the key and the key to enter MEASURE- AVERAGE.

  • Page 14: Storage Settings

    PLUS Hardness Tester DHT-200 -Press the key and the key to enter FILES--SETUP NEW FILE, -Press the key to enter this item, -Press the key or key for setting, -Press the key to confirm. 6.4.2 Storage settings Set the data auto-saving state during measurement by turning on or off. When data saving is set on “auto saving”, there will be a corresponding indication mark on the screen, and the measuring values will be stored in...

  • Page 15: Delete File Settings

    PLUS Hardness Tester DHT-200 -Press the key and the key to enter FILES--PRINT FILE, -Press the key to enter this item, -Press the key or key for setting, -Press the key to confirm. Prompt: For safety of data stored in the main unit, it is suggested that users should transfer all the saved data to PC or print them out after the measurement.

  • Page 16: Other Settings

    PLUS Hardness Tester DHT-200 -Press the key to enter this item, -Press the key or key for setting, -Press the key to confirm. Prompt: The deleted files will never be able to come back, so please be careful about your operation. 6.5 Other settings Various optional settings are available for users in the “option”...

  • Page 17: Calibration Settings

    PLUS Hardness Tester DHT-200 -Press the key and the key to enter OPTION--SET TOLERANCE, -Press the key to enter this item, -Press the key or key for setting, -Press the key to confirm. 6.5.3 Calibration settings Measuring error can be usually caused by impact device abrasion or changing another impact device.

  • Page 18: Lcd Brightness Settings

    PLUS Hardness Tester DHT-200 -Press the key and the key to enter OPTION--AUTOSHUTDOWN, -Press the key to enter this item, -Press the key or key for setting, -Press the key to confirm. ： Prompt It is not suggested to use the function of “OFF SHUTDOWN”, which consumes more power of batteries, even out of usage.

  • Page 19: Language Settings

    PLUS Hardness Tester DHT-200 -Press the key and the key to enter OPTION--SET KEY SOUND, -Press the key to enter this item, -Press the key or key for setting, -Press the key to confirm. 6.5.7 Language settings Multi-languages are offered to clients for convenience in usage. -Press the key and the key to enter OPTION--LANGUAGE,...

  • Page 20: Usage Of Integrated Printer

    PLUS Hardness Tester DHT-200 6.6 Usage of integrated printer DHT-200PLUS is equipped with micro-printer used for printing out the measuring or saved data; it is a printer with one line 16 characters, baud rate 9600. 6.6.1 Installation of printing paper 1.

  • Page 21: Deleting Of Wrong Measuring Data

    PLUS Hardness Tester DHT-200 6.8 Deleting of wrong measuring data During measurements, some measuring values are obviously error data; press the key to delete these values conveniently. 7. Repairing and Maintenance In order to keep the accuracy and reliability of the instrument, it is necessary of timely evaluation and maintenance.
  • Page 22 PLUS Hardness Tester DHT-200 2. We supply warranty of 24 months (excluding the easy damaged parts, such as impact devices, cable, Digital display, shell, suit case), and we will be in charge of the repairing and maintenance of our instrument for its whole life.

  • Page 23: Packing List

    PLUS Hardness Tester DHT-200 9. Appendix Appendix 1: Measuring range Table 1: Impact Device – D, DC D+15 Measuring Range LD:174-900 Material Steel 300-900 20.0-68.0 38.4-99.5 80-647 80-940 32.5-99.5 C.W. Tool Steel 300-840 20.4-67.1 80-898 Stainless ST 300-800 19.6-62.4 46.5-101.7 85-655 85-802 Gray Cast Iron 360-650 93-334...

  • Page 24: Appendix 2: Features Of Impact Devices

    PLUS Hardness Tester DHT-200 Appendix 2: Features of impact devices Configuration Type Application features Standard configuration Used for normal measurement Used for hardness measurement on local Short size, loaded with parts of work piece: holes, inner cylindrical loading tube face or inner face of solid installed parts. Used for measuring in grooves or concaved D＋15 Long size surface...

  • Page 25: Appendix 4: Supporting Rings

    PLUS Hardness Tester DHT-200 Appendix 4: Supporting rings Type Sketch Remarks Z10-15 For cylindrical outside surface R10-R15 Z14.5-30 For cylindrical outside surface R14.5～R30 Z25-50 For cylindrical outside surface R25～R50 HZ11-13 For cylindrical inside surface R11～R13 HZ12.5-17 For cylindrical inside surface R12.5～R17 HZ16.5-30 For cylindrical inside surface R16.5～R30 K10-15...

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