HBM K148 User manual

Operating Manual | Bedienungsanleitung
English Deutsch
K148
Calibration Unit
Kalibriergerät

Hottinger Baldwin Messtechnik GmbH
Im Tiefen See 45
D-64293 Darmstadt
Tel. [phone]
Fax [phone]
[email protected]
www.hbm.com
Mat.: 7-2001.1681
DVS: A01681_03_X00_04 HBM: public
01.2020
EHottinger Baldwin Messtechnik GmbH.
Subject to modifications.
All product descriptions are for general information only.
They are not to be understood as a guarantee of quality or
durability.
Änderungen vorbehalten.
Alle Angaben beschreiben unsere Produkte in allgemeiner
Form. Sie stellen keine Beschaffenheits- oder Haltbarkeits
garantie dar.

Operating Manual | Bedienungsanleitung
English Deutsch
K148
Calibration Unit
Kalibriergerät

2A01681_03_X00_04 HBM: public K148
English
1 Safety instructions 3........................................
2 Symbols used 7............................................
2.1 Symbols on the device 7......................................
2.2 Symbols used in this manual 7................................
3 Scope of supply 8..........................................
3.1 Option (not included among the items supplied) 8................
4 Field of application 9.......................................
5 Operation 11................................................
5.1 Connection 11................................................
5.1.1 Connector elements on the back of the device 11.................
5.1.2 Pin assignment 12............................................
5.2 Front panel of the device 17....................................
5.3 Special key setting features 20.................................
5.4 Driving the K148 21...........................................
6 Calibrating a measuring amplifier 24..........................

Safety instructions
K148 A01681_03_X00_04 HBM: public 3
1 Safety instructions
Appropriate use
The K148 calibration unit must only be used to calibrate strain‐gauge bridge
measuring amplifiers. Use for any purpose other than the above shall be
deemed to be inappropriate. In the interests of safety, the device should only
be operated as described in the Operating Manuals. It is also essential to
comply with the legal and safety requirements for the application concerned
during use. The same applies to the use of accessories.
Each time, before starting up the equipment, you must first run a project
planning and risk analysis that takes into account all the safety aspects of
automation technology. This particularly concerns personal and machine
protection.
Additional safety precautions must be taken in plants where malfunctions could
cause major damage, loss of data or even personal injury. In the event of a
fault, these precautions establish safe operating conditions.
This can be done, for example, by mechanical interlocking, error signaling, limit
value switches, etc.
General dangers of failing to follow the safety instructions
The K148 system is a state of the art unit and as such is reliable. The module
may give rise to dangers if it is inappropriately installed and operated by
untrained personnel.
Any person instructed to carry out installation, starting up, maintenance or
repair of the module must have read and understood the Operating Manual
and in particular the technical safety instructions.
Conditions on site
SProtect the device from direct contact with water.
SProtect the K148 from moisture and humidity or weather conditions such as
rain, snow.
SDo not expose the device to direct sunlight.

Safety instructions
4A01681_03_X00_04 HBM: public K148
SPlease observe the permissible maximum ambient temperatures and
humidity stated in the specifications.
SInstall the device so that it can be disconnected from the supply voltage at
any time without difficulty.
SIt is safe to operate the K148 up to a height of 2000 m.
Maintenance and cleaning
The K148 is maintenance-free.
SBefore cleaning, disconnect all connections.
SClean the housing with a soft, slightly damp (not wet!) cloth. You should
never use solvents, since these could damage the labeling.
SWhen cleaning, ensure that no liquid gets into the module or connections.
Residual dangers
The scope of supply and performance of the K148 only covers a small area of
measurement technology. In addition, equipment planners, installers and
operators should plan, implement and respond to the safety engineering
considerations of measurement technology in such a way as to minimize
remaining dangers. On-site regulations must be complied with at all times.
There must be reference to the remaining dangers connected with
measurement technology.
Product liability
In the following cases, the protection provided for the device may be adversely
affected. Liability for device functionality then passes to the operator:
SThe device is not used in accordance with the operating manual.
SThe device is used outside the field of application described in this Chapter.
SThe operator makes unauthorized changes to the device.

Safety instructions
K148 A01681_03_X00_04 HBM: public 5
Working safely
Notice
The device must not be directly connected to the DC voltage supply system.
Supply voltage 10 V … 15 V (DC).
The supply connection, as well as the signal and sense leads, must be
installed in such a way that electromagnetic interference does not adversely
affect module functionality (HBM recommendation: "Greenline shielding
design", downloadable from the Internet at http://www.hbm.com/Greenline).
Automation equipment and devices must be installed in such a way that
adequate protection or locking against unintentional actuation is provided (e.g.
access checks, password protection, etc.).
When devices are working in a network, these networks must be designed in
such a way that malfunctions in individual nodes can be detected and shut
down.
Safety precautions must be taken both in terms of hardware and software, so
that a line break or other interruptions to signal transmission, such as via the
bus interfaces, do not cause undefined states or loss of data in the automation
device.
Conversions and modifications
The device must not be modified from the design or safety engineering point of
view except with our express agreement. Any modification shall exclude all
liability on our part for any damage resulting therefrom.
In particular, any repair or soldering work on motherboards is prohibited. When
exchanging complete modules, use only original parts from HBM. The product
is delivered from the factory with a fixed hardware and software configuration.
Changes can only be made within the possibilities documented in the operating
manual.

Safety instructions
6A01681_03_X00_04 HBM: public K148
Qualified personnel
Qualified personnel means persons entrusted with the installation, assembly,
commissioning and operation of the product, who possess the appropriate
qualifications for their function.
This includes people who meet at least one of the three following requirements:
SKnowledge of the safety concepts of automation technology is a require
ment and, as project personnel, you must be familiar with these concepts.
SAs automation plant operating personnel, you have been instructed how to
handle the machinery. You are familiar with the operation of the equipment
and technologies described in this documentation.
SAs commissioning engineers or service engineers, you have successfully
completed the training to qualify you to repair the automation systems. You
are also authorized to activate, ground and label circuits and equipment in
accordance with safety engineering standards.
It is also essential to comply with the legal and safety requirements for the
application concerned during use. The same applies to the use of accessories.
The K148 must only be installed by qualified personnel, strictly in accordance
with the specifications and with the safety requirements and regulations listed
below.
Maintenance and repair work on an open device with the power on may only
be carried out by trained personnel who are aware of the dangers involved.

Symbols used
K148 A01681_03_X00_04 HBM: public 7
2 Symbols used
2.1 Symbols on the device
Symbol Meaning
Statutory waste disposal mark
In accordance with national and local environmental
protection and material recovery and recycling regulations, old
modules that can no longer be used must be disposed of
separately and not with normal household garbage.
Statutory mark of compliance with emission limits in electronic
equipment supplied to China
CE mark
The CE mark is used by the manufacturer to declare that the
product complies with the requirements of the relevant EC
directives (the Declaration of Conformity can be found at
www.hbm.com
2.2 Symbols used in this manual
Important instructions for your safety are specifically identified. It is essential to
follow these instructions in order to prevent accidents and damage to property.
Symbol Meaning
Notice This marking draws your attention to a situation in
which failure to comply with safety requirements can
lead to damage to property.
Important
Important information
This draws your attention to important information
about the product or about handling the product.

Scope of supply
8A01681_03_X00_04 HBM: public K148
3 Scope of supply
SK148
SConnection cable, 3 m long, 6-wire; to connect
to AP01i Order no.: 1-KAB268-3
S2 connection cables, 3 m long, 25-wire; to connect to AP815i and AP810i
Order no.: 1-KAB263-3
SUSB connection cable, 2 m long
SConnection cable for the RS232 serial interface, 2m long
SUSB power supply (Europlug)
SUSB power supply (NEMA-1)
SCD with driver software
SOperating instructions
3.1 Option (not included among the items supplied)
SDKD calibration certificate
SSteps -100/-0/0/10/20/..90/100% Order no.: K-CAL-VD2
SAdapter cable, 15-pin/MS connector (male),
0.3 m long Order no.: 1-KAB160-0.3

Field of application
K148 A01681_03_X00_04 HBM: public 9
4 Field of application
When measuring mechanical deformations electrically with strain gauge trans
ducers, it is interesting to know the precise correlation between the mechanical
quantity acting on the transducer and the corresponding electrical display at
the end of the measurement chain.
To achieve this, use the K148 calibration unit instead of a strain gauge trans
ducer. It delivers defined, electrical signals and simulates the effect of the me
chanical quantities acting on a strain gauge transducer.
The K148 calibration unit is designed for connecting single-channel measuring
amplifiers as well as multi-channel amplifiers with up to eight channels in a full-
bridge circuit. Six-wire circuitry is used for connection.
Single‐channelamplifier
Eight‐channel amplifier
Strain gauge full bridge 350
Ohm
direct
Switched in
series
Single
Channel
1
2
3
4
5
6
7
8
K148
Single-channel amplifiers are connected directly, the channels of multi-channel
amplifiers are switched through serially, internally.
The calibration unit has a strain gauge equivalent resistance of 350 ohms.
It can be operated via a USB interface or via the serial interface with a com
puter or controlled manually.
The K148 works in a frequency range of 225 Hz to 600 Hz with an accuracy
class of 0.0025; with DC and a CF u600....5000 Hz, the accuracy class is
0.025%. In DC it makes sense to zero the measurement values to eliminate

Field of application
10 A01681_03_X00_04 HBM: public K148
influences of thermo voltages and the cable. In SG measurements the zero
signal is not relevant.
An additional ”voltage ratio” DKD or factory calibration certificate ensures
traceability.
The calibration certificate is only valid for the carrier frequency and excitation
voltage specified therein. If the device is to be used at a multiple frequencies,
the associated calibration values must be determined in a separate calibration.

Operation
K148 A01681_03_X00_04 HBM: public 11
5 Operation
5.1 Connection
The K148 calibration unit can be connected to all amplifiers in a strain gauge
full-bridge circuit.
5.1.1 Connector elements on the back of the device
Connection socket for the
single‐channel amplifier
Connection socket for the serial interface
USB port for power supply/computer
communication
Socket for external 12 V power supply
(customer side, not included in scope of supply)
LED 1 LED 2
Connection socket for the
multi-channel amplifier
USBHBM1264
LED 1 yellow: Voltage supply OK
LED 2 green: USB link to the PC is active

Operation
12 A01681_03_X00_04 HBM: public K148
Notice
By use with the USB Port this a Class A product. In a domestic environment
this product may cause radio interference in which case the user may be re
quired to take adequate measures.
5.1.2 Pin assignment
Single-channel measuring mode (single channel)
This connection scheme applies to measuring amplifiers that work with a six-
wire circuit (sense lines for the excitation voltage). This ensures that measure
ment accuracy is not affected by the lengths of the measuring cables being
used.
1
8
9
15
Assignement
Cable
shield
PIN
Bridge excitation voltage (-)
Bridge excitation voltage (+)
Measurement signal (+)
Sense line (-)
Sense line (+)
Measuring signal (-)
8
5
6
15
13
12
1
2
3415-pin SUB-D
connector
Fig. 5.1 :K148 connector pin assignment (single channel)

Operation
K148 A01681_03_X00_04 HBM: public 13
AP01i
AP13i
AP14
AP455i
1
8
9
15
Connection cable, 6‐wire 1-Kab268-3
1
8
9
15
Single
channel
1
8
9
15
K148
Single
channel
AP03
Connection cable, 6‐wire 1-Kab268-3
Adapter cable 15‐pin
1-Kab160-0,3
HBM amplifier
K148
Fig. 5.2 :Connection cables to HBM amplifiers

Operation
14 A01681_03_X00_04 HBM: public K148
Eight-channel measuring mode (channels 1-4, channels 5-8)
1
13
14
25
Assignement
2
1
3
15
16
14
Hsg.
5
4
6
18
19
17
8
7
21
9
22
20
11
10
12
24
25
23
Hsg.
Cable
shield
Hsg. Hsg.
1/5
K148
2/6 3/7 4/8
Subchannel:
25‐pin SUB D connec
tor
Bridge excitation voltage. (-)
Bridge excitation voltage. (+)
Measurment signal (+)
Sense line (-)
Sense line (+)
Measuring signal (-)
1
2
3
4
PIN assignment, 25-pin sub‐D
connector
Fig. 5.3 :K148 connector pin assignment (CHANNELS 1-4, 5-8)

Operation
K148 A01681_03_X00_04 HBM: public 15
AP810i/AP815i
13
14
25
Subchannel
1...4
Subchannel
5...8
1
13
14
25
1
Connection cable, 25‐pin; 1-Kab263-3
1
13
14
25
CHANNEL 1... 4 CHANNEL 5... 8
1
13
1425
Connection cable, 25‐pin; 1-Kab263-3
HBM Amplifier
Fig. 5.4 Connection cables to HBM amplifiers
With single‐channel mode (SINGLE CHANNEL), a cable must not be con
nected to the 25-pin connection sockets (CHANNELS 1...4 and CHANNELS
5...8) and vice versa. It is advisable to always use the cables included among
the items supplied. Should the calibration unit have been calibrated, these
cables need to be used, since they were part of the calibration. The calibration
is therefore valid at the cable end.

Operation
16 A01681_03_X00_04 HBM: public K148
Voltage supply
The K148 can be powered in different ways:
Connector
USB power supply
(included in scope of
supply)
Front panel keyboard con
trol (stand‐alone operation)
Without data exchange
Power supply with USB
cable
LED1 LED2
Power supply via USB port
on PC
With/Without data
exchange
Current required when
USB port connected:
140 mA PC connector
External 12 V power supply
(not included in scope of
supply)
Input: 100 - 250 VAC;
Output min. 200 mA
Control LED 1 yellow: Voltage supply OK
Control LED 2 green: USB link to the PC active
Important
If a USB power supply and an external power supply are connected, the exter
nal power supply has priority..

Operation
K148 A01681_03_X00_04 HBM: public 17
Ground
+VIN
1
2
3
4‐pin connector, mini DIN*)
4
21
43
USBHBM1264
*)SELV circuit
(safety extra-low voltage)
Fig. 5.5 12 V DC IN connector pin assignment
5.2 Front panel of the device
Range steps / calibration steps
Channel selection
Polarity
% step
Measuring range

Operation
18 A01681_03_X00_04 HBM: public K148
Display
The K148 uses status LEDs to indicate its actual operating state.
LED POWER is a green light that shows when the power supply is present.
LED READY and an acoustic signal transmitter can be driven by the program
in computer mode (see Page 22).
For setting the acoustic display, see Page 20.
LED REMOTE is lit when the K148 is being operated via the USB connection
or the serial interface.
Settings
Channel selection
Use the arrow keys to select the channel (example: LED 4 is lit: channel 4 is
active). If none of the LEDs are lit, the device is in single-channel mode.
Polarity
Key + / − is used to select the positive or negative polarity of the output sig
nal (example: LED + is lit: the output signal has positive polarity).