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DMQ QH7 Series User Manual

Portable hardness tester
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  • Page 2 QH7 User Manual Portable Leeb / UCI Hardness Testers P/N: QHD 701 – ENG – Rev. 01 – November 2017...
  • Page 4 User Manual Index Introduction Leeb Measuring principle (Leeb) Selecting the impact device VIII Impact device components Using the impact device XIII Loading the impact device XIII Release and measure XIII Measuring principle (UCI) Selecting the UCI probe Test piece requirements Connecting the UCI probe UCI probe components XVII...

  • Page 5: Table Of Contents

    User Manual 2.1.4 Screen mode-4 (List values) How keys work Set impact device angle (Leeb) Selecting the material and hardness unit Chapter 3 Menu system and editing Using the menu system 3.1.1 Text editor Main menu 3.2.1 Change hardness units 3.2.2 Alarm settings 3.2.3...
  • Page 6 User Manual Measuring config. options (UCI) 3.5.1 Select material 3.5.2 Create user materials 3.5.3 Indenter dwell time 3.5.4 Measuring filter Measurement config. (Leeb & UCI) 3.6.1 The “Plus” key 3.6.2 Set group (N) number 3.6.3 Select measure mode 3.6.4 Set factory defaults Chapter 4 Using the Datalogger Understanding how data is organized...
  • Page 7 User Manual 4.8.5 Advanced configuration Appendix Tips on how to measure correctly (Leeb) Tips on how to measure correctly (UCI) Technical Specifications Additional information Unit maintenance QH7 accessories Error messages Our website: www.demeq.com Firmware and software updates Technical support...
  • Page 8 User Manual Thank you choosing dmq And thank you for purchasing a QH7 HEAVY DUTY portable hardness tester. Company Statement At Demeq we develop, manufacture and distribute software and quality control instruments offering innovation and solutions that come as a direct result of listening to your needs and demands as a user.

  • Page 9: General Information

    Information included in this manual applies to the QH7 HEAVY DUTY portable hardness tester in all of its 3 models. Registered trademarks dmq is a registered trademark of Demeq S.R.L and its affiliate companies. Important notice The information contained in this manual is intended to educate users on the operation of the QH7 hardness testers.
  • Page 10 User Manual This manual provides all of the information needed to configure and operate the QH7 portable hardness tester. However there are additional factors that can affect tests done with this instrument. Specific information on those factors is outside the scope of this manual.
  • Page 11 User Manual The measured Leeb value (HL) represents a direct hardness value that can be converted to other hardness units such as Brinell, Vickers, Rockwell and Shore. Both the HL value and another selected hardness unit are displayed on the unit screen simultaneously. Selecting the impact device Choose the impact device that is right for your application.
  • Page 12 User Manual Impact device type D This is considered the “universal” impact device because it covers the broadest range of hardness units, hardness ranges and materials for the QH7. Impact device type DC The type DC impact device is just like the type D except that it features a shorter body (50mm tall) making it ideal for measurements in hard to reach places where a type D impact device cannot be used.
  • Page 13 User Manual Impact device type E The type E impact device uses a synthetic diamond tip (all other impact devices use a tungsten carbide ball). The diamond tip allows measurements on harder parts such as those made out of template steel.
  • Page 14 User Manual Impact devices comparison table (Continued) Impact body Energy (N*mm) Mass (g) Surface test piece requirements Roughness ISO Rough RT (µm) Rough RA (µm) Minimum test piece weight (kg) Stand alone On solid support Coupled w/ paste 0.02 Minimum test piece thickness (mm) Coupled Surface thickness —...
  • Page 15 User Manual Impact device components This section provides an overview of basic impact device components. Figure 3: Impact device components Figure 3 is a representation of the most important parts that make up an impact device and the procedure used to remove the impact body. Over time and depending on the number of measurements that you make, the impact tip located on the impact body must be replaced.
  • Page 16 User Manual Using the impact device The procedure explained herein is applicable to all impact device types except for impact device type DC as it does not use a spring loading mechanism. Loading the impact device Place the impact device over the surface you want to measure and load by gently pushing the moving body of the impact device in the same direction as the test piece surface.
  • Page 17 User Manual Measuring principle (UCI) The QH7 U and C operate on the UCI or Ultrasonic Contact Impedance method of hardness testing where values are obtained by applying constant force to an indenter generating an indentation on the part being tested. But where as in conventional methods such as Vickers, Brinell or Knoop further evaluation is required, with the QH7 readings are processed electronically and instant measurements are obtained in the most common hardness units.
  • Page 18 User Manual Figure 5: Relationship between hardness and frequency Selecting the UCI probe We offer 2 UCI probes with the QH7 that differ in the test loads. UCI probe part no. QHS010 with a 10N / 1Kgf load This probe is ideal for surface hardness measurements as well as parts with low roughness and polished surfaces.
  • Page 19 User Manual Test piece requirements Minimum test piece conditions in order to obtain correct measurements with the QH7 for each type of probe are: UCI probe load 10N / 1kgf 50N / 5kgf Avg. Roughness 5 µm 15 µm Curvature radio >5 mm Weight >0,3 kg...
  • Page 20 User Manual UCI probe components This section briefly explains all of the basic UCI probe components and their intended use. Figure 7: UCI probe components Area where force is applied Cable connector for cable that goes to the QH7 UCI probe body Probe holding area (knurled) Bottom end of the probe Vickers indenter (synthetic diamond)
  • Page 21 User Manual Using the UCI probe UCI probe configuration Use the UCI probe according to the surface of the part being tested. Choose to use one side of the ring or remove the ring all together. Figure 8: UCI probe configurations Figure 8 A shows the UCI probe with the flat side of the support ring to measure on flat surfaces.
  • Page 22 User Manual When you are ready to measure force must be applied on the UCI probe that has been ergonomically designed for comfort of use and ease of operation. The 3 points in figure 9 show the positions to better hold and use the probe: 1 (top of the probe) is a large and “soft”...
  • Page 23 User Manual Measuring: preloading and loading For best results always apply force as follows: Figure 10: Preloading and loading the probe Set the probe on test point 1. Apply a preload force (indenter will go “half way” into the test piece 2). Apply full force to finish loading 3. Figure 11: Instructions in measuring screen When measuring the unit will also display 3 messages as follows: 1 Apply force to probe, 2 “Hold force and wait…”, 3 Lift probe.
  • Page 24 User Manual Important: Safety Information QH7 portable hardness testers are for industrial use only and cannot be used in medical applications. The QH7 operates with two rechargeable “AA” Nickel-Metal batteries. Disposal of your QH7 or any of its components must be done in compliance with your local applicable regulations.

  • Page 25: Front Panel

    User Manual 1 First steps 1.1 Know the QH7 1.1.1 Front panel Figure 1.1: Front panel Lemo type 00 connector for UCI probe Lemo type 0B connector for impact devices USB mini to connect to PC / battery charger Graphic LCD display with multiple color backgrounds Scroll left key / View partial statistics (Stat) key: Shortcut to return to the measuring screen from all unit menus / User assigned key (shortcut)
  • Page 26 User Manual Enter key / Change values in the measuring screen (Edit) 10. Set backlight illumination (On, Off, Auto) 11. Scroll down key / Quick access to screens with memory options (Mem) š key: On Off (hold for 2 seconds) / Special functions 13.

  • Page 27: Rechargeable Battery

    User Manual 1.2 Rechargeable battery 1.2.1 Battery level indicator The QH7 operates on (2) “AA” rechargeable batteries that can be charged using the USB connector in the unit. Depending on the current released by the charger and the state of the battery the unit adjusts for different charges: Normal Slow...

  • Page 28: Special Keys

    User Manual 1.3 Special keys 1.3.1 The “Q” key key has three functions: When the unit is off, touch for 2 seconds to power on the unit. When the unit is on, touch for 2 seconds to shutdown the unit. With the unit on, making short touches to the will activate special functions described in each chapter of this...

  • Page 29: Chapter 2 1 Measuring Screen Modes

    User Manual 2 Measuring with the QH7 The QH7 can display measurements in 4 different modes or screens that show specific information. To switch screens touch the key. 2.1 Measuring screen modes 2.1.1 Screen mode-1 (Easy reading) Figure 2.1: Screen mode-1 Average hardness value in the hardness unit selected by the user + (plus) or –...

  • Page 30: Screen Mode-2 (Graphic Values

    User Manual Leeb hardness value and impact device type / Number of N values for real time statistics (UCI) Battery level indicator / charger 2.1.2 Screen mode-2 (Graphic values) Figure 2.2: Screen mode-2 Group range Group standard deviation Number of (N) values indicator for real time statistics Average hardness value in the hardness unit selected by the user Leeb hardness value and impact device type...
  • Page 31 User Manual 11. Impact indicator (Leeb only) 12. Impact angle (Leeb) and probe load (UCI) indicator 13. Graphic reference values for the selected hardness unit 14. Graphic line high alarm 15. Graphic line group average 16. Graphic line low alarm 17.

  • Page 32: Screen Mode-4 (List Values)

    User Manual 2.1.4 Screen mode-4 (List values) Figure 2.4: Screen mode-4 21. User selected material 22. Datalogger mode indicator: X: Off - M: Manual - A: Auto 23. Name of the open file where values are being stored 24. Actual values within group 2.2 How keys work Keys in all four measuring modes have the following functions: : Manually store measurement in the memory...
  • Page 33 Settings including angle b: Settings without angle (auto) Figure 2.5: Select / Edit screen On “dmq” impact devices the angle is set automatically (Figure 2.5b). To change the impact device angle press the keys. To switch hardness units press the keys.

  • Page 34: Set Impact Device Angle (Leeb)

    User Manual Note Statistical information does not change in screen mode-1 “Easy reading” : Press for 2 seconds or more to turn unit off. : Change backlight illumination : Enter direct access function established by the user 2.3 Set impact device angle (Leeb) If you operate the QH7 with a generic brand impact device the angle in which the impact device will be used must be set manually.

  • Page 35: Selecting The Material And Hardness Unit

    User Manual Figure 2.7: Icons corresponding to the impact device angles When using dmq impact devices featuring GyroTag technology the QH7 automatically recognizes the impact device angle allowing you to always obtain precise measurements. The user can now measure complex parts in different angles without having to worry about the impact angle.
  • Page 36 User Manual The QH7 offers three ways to change hardness unit: • On the numerical measuring screen press to enter the select / edit mode and press the keys to select hardness unit. Press to save and exit. • Press the as long it was set to Unit in the direct access options that can be set for this key (Page 41)

  • Page 37: Menu System And Editing 3.1 Using The Menu System

    User Manual 3 Menu system and editing 3.1 Using the menu system The instructions explained in this chapter apply to all of the menus in the unit. To scroll QH7 menu options use the cursor keys. When you reach the end of the menu and move to the next menu option it becomes circular as shown herein.

  • Page 38: Text Editor

    User Manual 3.1.1 Text Editor The text editor is used to input, modify and delete; letters, numbers and symbols. Figure 3.3: Alphanumeric editor screens Selected key Cursor Text to be edited Virtual keyboard Use the cursor keys to scroll the virtual keyboard until you find the character that you want to use and press to select.
  • Page 39 User Manual Move cursor to the left Move cursor to the right Delete character on which cursor is on Enter and exit Press the key to open the direct access keyboard to the most commonly used virtual keyboard keys. Each virtual key corresponds to a key on the front panel of the unit as follows: Figure 3.5: Quick access keys for the virtual keyboard editor : Move cursor to the left...

  • Page 40: Main Menu

    User Manual 3.2 Main menu The main menu is the first list of options you see when you exit the measuring screen and includes some of the most important settings. Touch from the measuring screen to access this menu. Figure 3.6: Main menu Note: The "Memory", "Configure”...

  • Page 41: Alarm Settings

    User Manual Notes The units in (Figure 3.7) correspond to a type D impact device. Remember that hardness units depend on the impact device that is connected to the unit (Appendix, Page 61). Hardness units HU1 and HU2 are user units available in Leeb only (Page 30).

  • Page 42: Set Histogram Range

    User Manual Color Low : Set a display color associated with the low alarm. Beep: Audible intermittent alarm type. Back Color: Activates Color High/Low Alarm event. Screen: Visible alarm that causes measurements to be displayed in dotted instead of regular numbers. Light: Visible alarm that activates the display backlight illumination causing it to flash Set histogram range...

  • Page 43: Select Language

    User Manual Note When changing the hardness unit the histogram range changes to default values for the hardness unit that you selected. Select language 3.2.4 Language Press on language (which is also identified with a flag) to view available language options. Use the cursor keys to navigate available language options and touch to select.

  • Page 44: General Configuration

    User Manual Note If you purchase a model upgrade license we will ask for information available on the unit information screens. . General configuration Configure Touch on the Configure option to open the general configuration options menu. Use the keys to scroll the menu. Touch to select any of the menu options.

  • Page 45: Date And Time Format

    User Manual Figure 3.13: Time and date edit screens Date and time format 3.3.2 Configure » Clock Format Choose Clock Format to open the menu that allows you to set the time format (12Hs or 24Hs) and the date format (D/M/Y – M/D/Y). Touch on the option you wish to select and touch...

  • Page 46: Adjust Display Contrast

    User Manual Adjust display contrast 3.3.4 Configure » Contrast Contrast settings allow you to turn the unit screen lighter or darker where 1 is the lightest and 32 is the darkest. Touch on Contrast and use the keys to change the contrast on your screen.

  • Page 47: Beep Activation

    User Manual indicator) and use the key to change between the three basic colors options (R,G,B). Press to enter and exit, or press to exit without changes. Figure 3.17: Display background color settings Beep activation 3.3.6 Configure » Beep Beep refers to the sounds that the unit makes when keys are touched and when the audible alarm is active.
  • Page 48 User Manual 12345 and press again to access owner info menu options. Figure 3.18: Enter password and owner information menu The following owner information can be entered / changed: Name: Set or change the owner name. Phone: Set or change the telephone number. Name@: Set or change the e-mail (before the @).

  • Page 49: Lock Configurations

    User Manual Lock configurations 3.3.9 Configure » Locks Certain configuration options on the QH7 unit can be locked in order to avoid unwanted changes. Use of the locking options allow a supervisor to optimize unit configuration settings required for a specific test and then pass the unit on to an operator for him or her to conduct the actual measurements knowing that the unit has been properly configured and that the settings cannot be changed.

  • Page 50: Model Upgrade Licenses

    User Manual Model upgrade license 3.3.10 Configure » Licenses QH7 models can be changed with software licenses. If you want to purchase a model upgrade license we will ask you for the following information: • Unit model • Unit serial number •...

  • Page 51: Set Factory Defaults

    User Manual Figure 3.22: Response messages after a license is entered If the license number that you entered is correct the unit will show an updated license screen where the newly purchased license appears followed by a checkmark. The QH7 allows for two licenses: Leeb and UCI (L and U models). When both licenses are marked the unit is a C or combined model.

  • Page 52: Measurement Config. Options (Leeb)

    Figure 3.24: Measuring configuration options menú (Leeb) Setting these options correctly is critical in obtaining reliable measurements. When using dmq impact devices with GyroTag technology the option to change Angle does not appear in the menu. Set impact device angle (Leeb) 3.4.1...

  • Page 53: Select Material

    Note Options to manually change the impact device angle will appear only when generic impact devices are connected to the QH7. For all dmq impact devices with GyroTag technology all change angle options will not appear. Select material (Leeb) 3.4.2 Hardness »...

  • Page 54: Create User Units

    User Manual Create user units (Leeb) 3.4.3 Hardness » User Units The QH7 allows you to create two user units to measure materials such as special alloys that are not included in the materials menu. User units are created using test piece samples of known hardness values for the material that you want to create.
  • Page 55 User Manual Each measurement will appear on the unit display with large numbers until the N number of samples is completed. When this happens an symbol will appear indicating that the value on screen † is the average of the N measurements. Right below the average value the number that appears after can be changed to match the known hardness value of the test piece sample.
  • Page 56 User Manual To enter the second reference point, follow the same procedure that you used to enter the first one. User units are called HU1 and HU2. In the hardness unit selection menu, newly created user units will be followed by the hardness unit that they were based on.

  • Page 57: Select Impact Device

    To exit press Figure 3.30: Impact device selection menu When Auto is selected dmq impact devices featuring GyroTag or CalTag technology will be automatically recognized when they are connected to the QH7. When selecting the impact device type manually make sure that the impact device corresponds to the same type that is connected to the unit.

  • Page 58: Impact Device Alarm

    User Manual Impact device alarm (Leeb) 3.4.5 Hardness » Tip Alarm The tip on the impact device is a tungsten carbide ball subject to wear that is progressive and will most likely affect unit accuracy. If you are getting erroneous readings the tip is probably worn or damaged and needs to be replaced.

  • Page 59: Select Material

    User Manual Select material (UCI) 3.5.1 Durometro » Material Touch on Material to select the material that corresponds to the part that will be tested. Units are calibrated from factory to measure steel and additionally another 7 materials can be generated by the user with samples of a known hardness value Use the to scroll all menu options and touch...
  • Page 60 User Manual This menu shows the seven user materials, where those that have already been defined appear as selected (“Alum 7075” and “Alum 6061”). Undefined materials show unmarked. To edit or create a new user material press Figure 3.34: User materials menu To begin adding a new user material press on Calibrate and a menu will be displayed with standard base materials.
  • Page 61 User Manual After selecting the base material and hardness unit a name can be given to the newly created material. Press on Edit Name to give the new material a name or simply move on to the next step to keep the default name.
  • Page 62 User Manual Press to accept the first calibration point and two additional options will be displayed as follows: • press the to add another calibration point Other • press the to finish setting up the new user Ready material with just one calibration point When a new material is created using one point calibration only displacement for the base material that you selected can be generated and is known as a grade 0 (zero) equation that could be...

  • Page 63: Indenter Dwell Time

    User Manual displayed in the materials menu. To erase a user material go to Delete in the new user materials menu. Keep in mind that the name is kept unless you change it. Notes By default user materials that have not been created are listed as “User Mat.

  • Page 64: Measuring Filter

    User Manual Measuring filter (UCI) 3.5.4 Hardness » Filter This option allows you to set a measuring filter so that noisy or erroneous measurements are discarded. In practice this means that obtaining precise readings takes more time as extra care must be taken when preloading the probe.

  • Page 65: The "Plus" Key

    Figure 3.42: Menu options for the “Plus” key Quick access options are as follows: Angle: Change impact device angle (option not available when using dmq impact devices and when working in UCI mode) Unit: Change hardness unit Store: Use to manually store values...

  • Page 66: Set Group (N) Number

    User Manual Set group (N) number 3.6.2 Hardness » Group (N) In order to obtain reliable measurements with your QH7 we suggest taking at least three measurements within 3 to 4mm from one another and using the average of these three values as your final hardness measurement.

  • Page 67: Select Measure Mode

    User Manual Select measure mode 3.6.3 Hardness » Measure on Measure to open the measure modes options menu. Press Figure 3.44: Measure mode options menu and set nominal value The modes in which measurements can be made are: Absolute: The unit displays the real measured value. Differential: The value displayed is a result of the value obtained from calculating: Differential = Real value –...

  • Page 68: Set Factory Defaults

    User Manual Set factory defaults 3.6.4 Hardness » Set Default Choose Set Default to return to factory default hardness configuration settings. Press and a confirmation screen will appear. Press to confirm and return to the previous menu or to exit without making changes.
  • Page 69 User Manual 4 Using the Datalogger 4.1 Understanding how data is organized In order to optimize the use of the Datalogger in your QH7 you first need to understand how data is organized. Up to 8 individual files with alphanumeric names can be used to store data. Each file contains a grid with columns and rows and each grid contains columns identified with consecutive letters (A, B, …AA, AB…) that store a number of values set in Group (N).

  • Page 70: Memory Menu

    User Manual Memory menu Memory Select Memory from the main menu to view all menu options for the Datalogger. This chapter explains how to create, organize and view files Figure 4.2: Memory menu Create new file Memory » Files » “Empty” Press on Files and use the cursor keys to see the list of files in the unit.

  • Page 71: Create A New File

    User Manual closed. Once a file has been closed it cannot be reopened and new values can no longer be stored. In closed files values can only be viewed. When you create a new file and another file is already open a warning screen will ask if you want to close the last file.

  • Page 72: View Data In A Single File

    User Manual View data in a single file 4.4.1 Memory » Files » “Mi_File” » View Data Press on View Data to see values stored in the file. Press to exit the file. Figure 4.6: View file in grid format To move within the grid use the cursor keys and press the to go to the last column that contains data.
  • Page 73 User Manual 4.4.2 The “Q” key in a grid Press to open the quick access menu that allows you to go directly to a position inside the grid. Select the Row, Column, and Cell using the keys. Figure 4.8: Quick access menu options in a grid Row: Enter a row number using the cursor keys so that when you touch the grid will position itself directly on that row.

  • Page 74: The "Q" Key In A Histogram

    User Manual 4.4.3 The “Q” key in a histogram Press the key in the histogram to open the quick access menu that allows you to obtain statistical information for the group of values being displayed. Figure 4.9: Quick access menu options in a histogram Error: Displays the number of errors and error percentage values in the batch based on the high and low alarm settings.

  • Page 75: Send Data In File

    User Manual Send data in file 4.4.5 Memory » Files » “Mi_Flie” » Send on Send to values from a single file to a PC using Press Windows HyperTerminal. Files can also be sent to a printer using an RS232 connection. This option does not work in USB mode. View file size 4.4.6 Memory »...

  • Page 76: Erase All Files

    User Manual Erase all files 4.5.2 Memory » For All » Erase All The Erase All action permanently deletes all files stored in the unit memory and recovers 100% of the memory capacity. Before files are actually deleted a screen will be displayed asking you to confirm or to cancel this action.

  • Page 77: Quick Memory Menu (Mem Key)

    User Manual 4.6 Quick memory menu (Mem key) Press on the measuring screen to open the quick memory menu. Figure 4.13: Quick memory menu options In each quick memory menu screen three options are displayed. To access these options use the keys.

  • Page 78: Connecting To A Pc With Datacenter

    Figure 4.14: Connecting to a PC With the unit waiting to connect follow these simple steps: plug the USB cable first to the QH7 and then to the PC, open dmq DataCenter software on your PC and click <Connect> in DataCenter.

  • Page 79: Datalogger Configuration

    User Manual Datalogger configuration Memory » Configure In the memory menu touch Configure open Datalogger configuration options menu. Figure 4.15: Datalogger configuration menu Configure communications 4.8.1 Memory » Configure The first two options in the Datalogger configuration menu are Mode and Send which allow you to select how the unit will communicate with a PC and if you will be sending data to a PC or to an external printer.

  • Page 80: Search For Bluetooth Devices

    User Manual Press on Send to select whether you will send files to a PC or to a printer. PC: When using an RS232 cable the unit sends data in an optimal format for Windows HyperTerminal (38400-8-N-1). Printer: Using an RS232 cable and printer the unit sends data in an optimal format for mini-printers of 40 columns (9600/8-N-1).

  • Page 81: Show Receiving Device

    User Manual At this point in time the QH7 will show “Searching…” and in approximately 15 seconds the unit will show all available Bluetooth devices that are close to the unit. Use the keys to select the device that you want to connect to and press to finish configuring Bluetooth communications.
  • Page 82 User Manual Advanced configuration 4.8.5 Memory » Configure » Advanced Press on Advanced to access the advanced configuration options menu for the Datalogger. Figure 4.20: Advanced configuration options When you enable History the Datalogger will register the unit settings for each measurement that is stored (this information can only be viewed in DataCenter).
  • Page 83 User Manual Tips on how to measure correctly (Leeb) Make sure to use the best impact device for your application based on the actual material, as well as the hardness unit and actual hardness range that you want to measure. Refer to the table below. Measuring ranges and hardness unit (Leeb) Impact device type Unit...
  • Page 84 User Manual Hardness Ranges (continued) Tipo de dispositivo Unidad D/DC D+15 Spheric iron (cont.) 21~60 — — — — — 96~724 — — — — — Cast aluminium 30~165 — 21~187 33~167 32~168 46~176 43~193 — 21~191 — — 47~198 —...
  • Page 85 User Manual Don’t measure test pieces that exceed the maximum hardness limits of your impact device: Impact device type Maximum hardness D – DC – DL – E 890 HL (68 HRC) 960 HL (70 HRC) 750 HL (645 HB) To obtain precise measurements the following minimum mass and thickness requirements must be met: Impact device type...
  • Page 86 User Manual When measuring on curved surfaces the curvature radius should not go above 0.3mm in both concave and convex angles. Always use supporting rings on non-flat surfaces. Figure A.1: Measuring on curved surfaces Always make sure that the unit has been correctly configured for material, impact device type and impact device angle.
  • Page 87 User Manual Tips on how to measure correctly (UCI) Choose the UCI probe that is best suited for your application and take all of the following into consideration. Measuring ranges and hardness units (UCI) Material Unit Steel Aluminum Copper Brass 100~940 44~189 40~130...

  • Page 88: Technical Specifications

    User Manual Always make sure to configure the unit to the material being tested. Don’t measure over a previous indentation or on corroded parts. The test piece surface must be clean, dry and free of grease. Do not use lubricants or grease in the mechanical parts of the probe. Technical Specifications Leeb Method (Impact or Rebound) Impact Devices...

  • Page 89: General Specifications

    User Manual Resolution Vickers : 1 HV (complete range) Brinell : 1 HB Rockwell : 0,1 HRB / C Shore : 0,1 HS MPa: 1 MPa Measuring range 100 HV to 940 HV Precision In Vickers: ±5% Conversions According to ASTM E 140 and DIN 50150 General Specifications Real-time statistics Maximum, Minimum, Medium, Range...
  • Page 90 Additional information To become a part of the Demeq family of users and to receive newsletters as well as promotional offers that are available only to dmq customers please register online at: http://www.demeq.com/form_Register.html Unit maintenance The QH7 was developed and manufactured for years of trouble free...
  • Page 91 User Manual QH7 Accessories dmq part no Description QHS101 Type D impact device with cable QHS201 Type DC impact device with cable QHS301 Type DL impact device with cable QHS501 Type C impact device with cable QHS601 Type G impact device with cable...

  • Page 92: Error Messages

    User Manual Error messages Under abnormal conditions an error message may appear on the unit screen and should be treated as informational only. If an error message is displayed follow the instructions described below and if the problem persists please send a detailed report at: http://www.demeq.com/form_Support.html Figure A.2: System error message Error 1...

  • Page 93: Technical Support

    • New accessories Firmware and software updates To download firmware and software updates to your QH7 you must have dmq DataCenter installed on your PC. To download the latest version of DataCenter visit: http://www.demeq.com/Download.html Technical support Our service department is committed to providing prompt and courteous service.
  • Page 94 P/N QHD701-ENG Rev 1 ©2017 dmq...

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