DMQ QH5 Series User manual

P/N: QHD501 –ENG –Rev 4 –2020

I
Chapter 1
First steps
1.1
Know the QH5
1
1.1.1
Front panel
2
1.1.2
Connectors
2
1.2
Install or replace batteries
3
1.3
Connecting the impact device
5
1.4
Using the impact device
6
1.4.1
Loading the impact body
6
1.4.2
Release and measure
6
1.5
The “Q” key
7
1.6
Display illumination and contrast
7
1.6.1
Display backlight illumination
7
1.6.2
Display contrast
8
1.7
Locking and unlocking the keypad
8
Chapter 2
Measuring with the QH5
2.1
Numerical measure screen (Normal)
10
2.1.1
Screen mode-1 (Datalogger)
10
2.1.2
Screen mode-2 (Material)
11
2.1.3
Screen mode-3 (Statistics)
11
2.2
Keys in numerical measure modes
12
2.3
Graphic measure screen (Histogram)
14
2.4
Keys in the graphic measure screen mode
15
2.5
Set impact device angle
16
2.6
Select material and hardness unit
17
Chapter 3
Menu system and editing
3.1
Instructions on using the menu system
19
3.1.1
Text editor
20
3.2
Main menu
22
3.2.1
Change hardness unit
22

II
3.2.2
Alarm settings
23
3.2.3
Set histogram range
24
3.2.4
Select language
24
3.2.5
Unit information
25
3.3
General configuration options
25
3.3.1
Set time and date
26
3.3.2
Set time and date format
26
3.3.3
Set keypad sensitivity
26
3.3.4
Set auto-off time
28
3.3.5
Adjust display contrast
28
3.3.6
Beep activation
29
3.3.7
Introduction screen
29
3.3.8
Owner information
29
3.3.9
Lock configuration options
31
3.3.10
Model upgrade licenses
32
3.3.11
Return to factory default settings
33
3.4
Measuring configuration options (Hardness)
34
3.4.1
Set impact device angle
34
3.4.2
Select material
35
3.4.3
The “Plus” key
35
3.4.4
Set group (N) number
36
3.4.5
Select measure mode
37
3.4.6
Create custom or user units
37
3.4.7
Select impact device type
41
3.4.8
Set alarm for impact device tip
42
3.4.9
Return to factory default settings
42

III
Chapter 4
Using the Datalogger
4.1
How data is organized
43
4.2
Memory menu
44
4.3
Creating a file
44
4.4
Actions over single files
45
4.4.1
View data in a single file
46
4.4.2
The “Q”key in a grid
47
4.4.3
The “Q”key in a histogram
48
4.4.2
Send data from a single file
48
4.4.3
Rename a file
49
4.4.4
View file size
49
4.5
Actions over all files
49
4.5.1
Send all files
49
4.5.2
Erase all files
49
4.6
Quick memory menu (Mem key)
50
4.7
Connecting to PC with DataCenter
51
4.8
Datalogger configuration
52
4.8.1
Configure communications
52
4.8.2
Capture modes
54
4.8.3
Advanced configuration
54
Tips on how to measure correctly
Technical specifications
Additional information
Unit maintenance
QH5 accessories
Error messages
Proper disposal
Our website: www.demeq.com
Technical Support

IV
And thank you for purchasing a QH5 rebound hardness tester.
At dmq 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 as a user. We apply some of
the latest technology available in the industry to build instruments
that are robust, precise and easy to operate.
We are convinced that our products would not be complete without
permanent technical and after sales support. So in addition to a great
product we offer:
Quick answers to your inquiries.
Unlimited access to technical information as well as
application notes.
Special offers for registered customers.
Firmware and software upgrades at no charge.
Attention to your inquiries and suggestions.
We hope that the QH5 will meet and exceed your application needs.

Chapter 1 1
The information included in this manual applies to QH5 series
portable hardness testers including models D, G and M.
dmq is a registered trademark of demeq S.R.L and its affiliate
companies.
The information contained in this manual is intended to educate
users on the operation of the QH5 impact hardness testers. Failure to
read and understand this manual can lead to measurement errors.
Decisions based on measurements and or results that are erroneous
can lead to property damage, personal injury or even death. Demeq
S.R.L assumes no responsibility as a result of the improper use of our
instruments.
ASTM A956
Correct use of an impact hardness tester requires that you take all of
the following into consideration:
Select the instrument as well as the impact device that is
best suited for your application.
Know the specific requirements for the test you will be
conducting.
Make sure that the person operating the unit has been
trained on its use.

2 Chapter 1
This manual provides all of the information needed to configure and
operate the QH5 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.
When in doubt you should always seek expert advice or refer to
specific textbooks on portable hardness testing. Additional
information can also be found on the internet and through local
government agencies as well as in technical institutes.
QH5 D, G and M models operate on the Leeb impact rebound
method where the ratio between the impact and rebound velocities
that is released on the test piece is measured to establish a Leeb
hardness value. The step by step process is represented in figure 1 as
follows: 1, the impact body is released and travels inside the impact
device; 2, the impact body tip hits the test piece; 3, the impact
produces a rebound.
Figure 1: Representation of the Leeb rebound method

Chapter 1 3
The measured Leeb value (HL) represents a direct hardness value that
is automatically converted to other hardness units of your choice such
as Brinell, Vickers, Rockwell and Shore. Both the HL value and another
selected hardness unit are displayed on the unit screen
simultaneously.
We offer 6 (six) impact devices being that each one of them is
different and ideal for specific applications. In this section we offer
general information including measuring ranges and recommended
applications for each impact device type.
Please see figure 2 below for a representation of the physical aspect
of each one of the impact devices that we offer.
Figure 2: Available impact device types for QH5 units

4 Chapter 1
Impact device type D
This is a “universal” type impact device because it covers the widest
range of hardness units, hardness ranges and materials available on
QH5 hardness tester which also means that you will cover the widest
range of applications.
Impact device type DC
The only difference between a type DC and a type D impact device is
that the body on a DC impact device is 86mm long or half the length
of a type D impact device making it ideal for measurements in hard
to reach places. Unlike all other impact devices that are spring loaded
type DC impact devices are loaded manually.
Impact device type DL
The long and thin “needle type” tip allows DL impact devices to work
in very narrow areas that cannot be measured with any other impact
device. This impact device is commonly used to measure hardness in
gears.
Impact device type C
Type C impact devices produce the least amount of energy when
compared to all other impact devices (up to 25% less than device
type D) making it the best choice for measuring superficial hardness
and small parts. The lowest impact energy also means the smallest
indentation.
Impact device type G
Type G impact devices use a ball that is 5mm in diameter and it also
releases the highest impact energy at 90 N*mm allowing it to be
used over rough surface finishes such as those found in metal casts.