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Instruction
manual
5118B…_002 − 150e-10.18
Power Supply/
Coupler
Type 5118B1 and
5118B2
ä
Instruction
manual
5118B…_002 − 150e-10.18
Operating Instruc-
tions Power Supply/
Coupler
Types 5118B1 and
5118B2
ä
Page 1
5118B…_002 − 150e-10.18
Thank you for choosing a Kistler quality product characterized
by technical innovation, precision and long life.
Information in this document is subject to change without
notice. Kistler reserves the right to change or improve its
products and make changes in the content without
obligation to notify any person or organization of such changes
or improvements.
© 2018 Kistler Group. All rights reserved. Except as expressly
provided herein, no part of this manual may be reproduced
for any purpose without the express prior written consent
of Kistler Group.
Kistler Group products are protected by various intellectual
property rights. For more details visit www.kistler.com. The
Kistler Group includes Kistler Holding AG and all its subsidiaries
in Europe, Asia, the Americas and Australia.
Kistler Group
Eulachstrasse 22
8408 Winterthur
Switzerland
Tel. + 41 52 224 11 11
info@kistler.com
www.kistler.com
Foreword
Foreword
Power Supply/Coupler Type 5118B1 and 5118B2
5118B…_002 − 150e-10.18Page 2
Content
1. Introduction .................................................................................................................................4
1.1 For your safety ....................................................................................................................4
1.2 Electromagnetic compatibility (EMC) ..................................................................................5
1.3 Warnings and their relevance .............................................................................................5
1.4 Disposal instructions for electrical and electronic equipment .............................................5
1.5 Software upgrades and updates .........................................................................................6
1.6 Using this manual ...............................................................................................................6
2. General description ....................................................................................................................7
2.1 Supplied and optional items ...............................................................................................7
2.2 Compatibility .......................................................................................................................8
2.3 CE Conformity ....................................................................................................................8
2.4 Piezoelectric measurement concept ...................................................................................8
2.4.1 The high impedance sensor ..................................................................................8
2.4.2 The low impedance sensor ...................................................................................9
2.4.3 Low impedance measuring system .......................................................................9
3. Technical information, functional description .......................................................................10
3.1 Power supply ....................................................................................................................10
3.1.1 Supply current .....................................................................................................10
3.2 Rapid Zero ........................................................................................................................ 11
3.3 Voltageamplier ...............................................................................................................11
3.4 Bias indicator ....................................................................................................................11
3.5 Low Battery Indication ......................................................................................................12
4. Assembly, installation and operation ......................................................................................13
4.1 Unpacking .........................................................................................................................13
4.2 Connections ......................................................................................................................13
4.2.1 Signal Connections .............................................................................................13
4.2.2 Power Supply Connection ...................................................................................13
4.3 Battery operation ..............................................................................................................14
4.3.1 Installation and operation ....................................................................................14
4.3.2 Battery back-up ...................................................................................................15
4.4 Front - rear panel controls and indicators .........................................................................15
4.4.1 Power switch .......................................................................................................15
4.4.2 Bias indicator .......................................................................................................15
4.4.3 Unit gain ..............................................................................................................16
4.4.4 Highpasslter ......................................................................................................16
4.4.5 Rear panel ...........................................................................................................17
Page 3
5118B…_002 − 150e-10.18
Total pages 24
4.5 Lowpasslters ..................................................................................................................18
4.5.1 General information .............................................................................................18
4.5.2 Purposeoflowpassltering ................................................................................18
4.5.3 Installation ...........................................................................................................20
5. Maintenance and calibration ....................................................................................................21
5.1 Calibration ........................................................................................................................21
5.2 Bias test ............................................................................................................................21
5.3 Maintenance and repairs ..................................................................................................21
6. Storage and transportation considerations ...........................................................................22
7. Technical data ...........................................................................................................................22
7.1 Technicalspecication ......................................................................................................22
8. Warranty .....................................................................................................................................22
Appendix A — Condensed operating instructions ...........................................................................23
Type 5118B1 ...............................................................................................................................23
Type 5118B2 ...............................................................................................................................23
Power Supply/Coupler Type 5118B1 and 5118B2
5118B…_002 − 150e-10.18Page 4
1. Introduction
Please take the time to thoroughly read this instruction manual.
It will help you with the installation, maintenance, and use of this
product. General know-how about PLC control system setup,
programming and device integration is required.
To the extent permitted by law Kistler does not accept any
liability if this instruction manual is not followed.
Kistler offers a wide range of products for use in measuring
technology:
Piezoelectric sensors for measuring force, torque, strain,
pressure, acceleration, shock, vibration and acoustic-emis-
sion
Strain gage sensor systems for measuring force and torque
Piezoresistive pressure sensors and transmitters
Signal conditioners, indicators and calibrators
Electronic control and monitoring systems as well as soft-
ware for specific measurement applications
Data transmission modules (telemetry)
Kistler also develops and produces measuring solutions for
the application fields engines, vehicles, manufacturing, plas-
tics and biomechanics sectors. Our product and application
brochures will provide you with an overview of our product
range. Detailed data sheets are available for almost all products.
If you need additional help beyond what can be found either
online or in this manual, please contact Kistler’s extensive
support organization.
1.1 For your safety
The device left the factory in a perfectly safe condition. To
maintain this condition and ensure safe operation, follow
the directions and warnings in this Instruction Manual and
on the device.
Also follow local safety regulations governing the handling
of electrical and electronic equipment.
If it has to be assumed that the amplifier can no longer be
operated safely, switch it off and secure it to ensure it cannot
be switched on again inadvertently.
Safe operation is no longer possible
if the equipment is visibly damaged,
if it is not working properly,
after prolonged storage under adverse conditions,
after being severely impacted in transit.
Introduction
Page 5
5118B…_002 − 150e-10.18
If any of the above indicates that safe operation is no longer
ensured, the device must be immediately sent to the respon-
sible Kistler sales center or distributor for repair.
1.2 Electromagnetic compatibility (EMC)
The Type 5118B… charge amplifier is manufactured in con-
formity with CE requirements. It meets the electromagnetic
compatibility safety requirements to EN 61000 - 6-2 (Immunity)
and EN 61000 - 6-4 (Interference).
1.3 Warnings and their relevance
Disregard of the following precautions can lead to malfunctions
or damage to system components, environment or people
(see table below).
Symbol Disregard may have consequence
Mechanical defects or with unpredictable consequence
(might endanger material or people)
Indicates a caution or warning notice
Indicates a tip or important information
1.4 Disposal instructions for electrical and electronic equipment
Do not discard old electronic instruments in municipal trash.
For disposal at end of life, please return this product to an
authorized local electronic waste disposal service or contact the
nearest Kistler Instrument sales office for return instructions.
Power Supply/Coupler Type 5118B1 and 5118B2
5118B…_002 − 150e-10.18Page 6
1.5 Software upgrades and updates
Kistler may from time to time supply upgrades or updates for
embedded software. Such upgrades or updates must always
be installed.
Kistler declines any liability whatsoever for any direct or con-
sequential damage caused by products running on embedded
software which has not been upgraded or updated with the
latest software supplied.
This device does not allow Firmware update by customer.
Please get in contact with you Kistler Service Center in order
to check options to update your device to the latest Firmware.
1.6 Using this manual
It is recommended that the user reads the entire manual prior
to operating the coupler. A thorough understanding of this
instrument will ensure the maximum utilization of the many
instrument features. A detailed table of contents has been
included to assist the user.
A convenient “Quick Start” section can be found in Appendix
A. This section provides the basic information required to place
the coupler into operation immediately without a detailed
explanation of the coupler’s functions.
General description
Page 7
5118B…_002 − 150e-10.18
2. General description
The Kistler 5118B series of couplers provide constant current
power to Kistler and other low impedance piezoelectric sensors.
This coupler is variously known as a constant current source
supply or an ICP power supply. All units can be powered from
internal batteries or an external DC power source.
The 5118B series is available in two types. The Type 5118B1
provides constant current excitation and removes the DC bias
component from the low impedance, voltage mode sensor.
Front panel indicators alert the operator as to the condition
of the sensor, cable and battery. Optional plug-in lowpass
filters are available.
Fig. 1: Front panel of the Type 5118B2
The 5118B2 contains all the features of the 5118B1 with the
addition of input amplification with selectable gains of X1, X10
and X100. A front panel switch allows for selection between
two highpass filters. A plug-in lowpass filter is available.
2.1 Supplied and optional items
The standard coupler is supplied in an extruded aluminum
case that is suitable for stand-alone operation or for mounting
is a panel. The couplers operate from batteries, DC power
or an external power supply. An optional panel mounting kit
is available.
Table 1 (next page) lists accessories available for the 5118B
coupler. Refer to the 5118B data sheet for supplied and op-
tional accessories.
Power Supply/Coupler Type 5118B1 and 5118B2
5118B…_002 − 150e-10.18Page 8
Quantity Description Kistler part number
4 Alkaline batteries, 1.5V 55129297
1Power adaptor, 230/120 VAC — 12
VDC (optional) Type 5752
16 foot DC power cable mate to
pigtails (optional) 55131496
Tab. 1: Included and optional items for the 5118B series
2.2 Compatibility
The 5118B series is compatible with virtually all low imped-
ance piezoelectric sensors. Sensor types include Piezotron,
and PiezoBEAM. This Kistler power supply/coupler provides
constant current power to Kistler and other low impedance
piezoelectric sensors. The power supply/coupler is variously
known as a constant current source supply or ICP power sup-
ply. The 5118B will also power external impedance converters
such as the Kistler Type 557, 558 and many other “Source
Followers” and “Charge Converters” that require a constant
current power supply
2.3 CE Conformity
The Type 5118B conforms with the appropriate standards
and regulations on electromagnetic compatibility and prod-
uct safety. These standards and regulations are listed on the
Declaration of Conformity in the rear of this manual.
2.4 Piezoelectric measurement concept
This section provides basic information about high and low
impedance piezoelectric sensors. The following descriptions
only cover how these types of sensors are used with the 5118B
couplers. Technical papers are available from Kistler for users
that desire a more theoretical discussion.
2.4.1 The high impedance sensor
High impedance piezoelectric sensors convert mechanical phe-
nomena of pressure, force, and acceleration into an electrical
charge. The charge delivered by the sensor is proportional to
the force acting on the internal quartz (piezoelectric) crystal
General description
Page 9
5118B…_002 − 150e-10.18
element. For the transducer, the calibration factor is given
in picoCoulombs per mechanical unit (e.g. pC/bar, pC/N,
pC/g, etc.).
The 5118B coupler is designed for use with low impedance,
voltage mode sensors. The coupler can be used with high
impedance sensors when used in conjunction with an external
impedance converter e.g., the Kistler Types 557 and 558. Kistler
offers a line of dual-mode and charge amplifiers for use with
charge mode sensors. Consult Kistler for more information
on instrumentation for charge-mode sensors.
2.4.2 The low impedance sensor
A miniature electronic circuit is built into the housing of a low
impedance sensor. This circuit converts the high impedance
charge signal generated by the piezoelectric material into
avoltage signal, with an output impedance typically below
100 Ω. This allows the use of conventional, coaxial or two-wire
cable between the sensor and the remotely located power
supply/coupler. Both the power to and signal from the sensor
are transmitted over the two-wire cable.
Low impedance sensors are ideally suited for applications
where long or moving cables are required or in high humidity
or other contaminated atmospheres. They eliminate the high
impedance problems by providing a voltage signal with low
impedance and a wide frequency response. The calibration
factors for these sensors are given in millivolts per mechanical
unit (e.g., mV/bar, mV/N, mV/g, etc.).
2.4.3 Low impedance measuring system
A typical low impedance measuring system consists of thefol-
lowing components:
The sensor (with built-in impedance converter).
A power supply/coupler e.g., 5118B series
A read-out or display instrument.
Appropriate connecting cables.
Power Supply/Coupler Type 5118B1 and 5118B2
5118B…_002 − 150e-10.18Page 10
3. Technical information, functional description
This section describes the functions of pertinent stages of
the coupler circuits.
3.1 Power supply
This part describes the internal power conditioner consisting
of the DC to DC converter and current source as shown in
Figure 1. The couplers can be powered with four 1.5 Volt, AA
alkaline batteries; a user supplied external DC power supply,
or AC-DC line operated power adapter.
The coupler’s power conditioner is equipped with the fol-
lowing features:
Over voltage protection.
Reverse polarity protection.
Input voltage range of 6…30 VDC.
Battery lifetime of approximately 12 hours when using
alkaline-zinc batteries and accelerometer current at 2mA
(factory set).
Automatic switching between battery and external
power. The 5118B will select the input with the highest
voltage.
The power conditioning stage contains a voltage converter
which converts the input power level (from batteries or external
power) to ±30 VDC. Voltage regulators furnish power, at the
proper levels, to the various stages of the coupler.
The 5118B is protected from excessive input voltage and reverse
polarity. If any of these faults occur an internal self-resetting
switch will open. When the fault is corrected, the switch will
close and the unit will be ready for operation.
3.1.1 Supply current
A constant current source supplies a constant 2mA to the
connected sensor. The sensor current can be increased (factory
modification) to a maximum of 18 mA. Note that increasing
the supply current will decrease the internal battery life.
For most applications, the 2mA current supply is more than
adequate. Increased current is sometimes required when using
long cables between the sensor and coupler. As cable length
is increased the cable capacitance becomes significant, there-
by loading the sensor’s internal electronics. If the current is
not sufficient to charge the cable at an adequate rate, high
frequency distortion will be experienced. The solution to this
Technical information, functional description
Page 11
5118B…_002 − 150e-10.18
problem is to increase drive current. The following formula
can be used to determine the maximum usable frequency:
fmax(kHz) = (I - 1) ÷ 2π Vpp Cc
Where:
I = Sensor current (milli-amperes)
Cc= Total cable capacitance (micro-farads)
Vpp = Full scale signal amplitude (volts)
3.2 Rapid Zero
A “Rapid Zero” circuit reduces the long settling times usually
associated with turning on power, changing amplifier gains and
filter time constants. The circuit disables the 5118B amplifier
for a period of approximately two seconds while pre-charging
the amplifier’s coupling capacitors, thus making the 5118B
operational to the user within a few seconds.
3.3 Voltage amplifier
The voltage amplifier is comprised of the highpass and lowpass
amplifier (Figure 1). In addition to the selectable gain, the
amplifier stage also provides the switchable time constants
of the highpass filter. This stage has excellent common mode
rejection. The gain of this stage is set at 1X in the Type 5118B1
providing decoupling and isolation.
Provisions are included for a standard Kistler plug-in lowpass
filter. The 2-pole Butterworth lowpass filter is implemented
using a Sallen-Key configuration exhibiting a -12 dB/octave
rolloff. See Section 4.5.1 for a list of frequencies and type
numbers.
3.4 Bias indicator
The bias indicator circuit consists of voltage comparators and
three LED indicators. The “Normal” LED is on when the bias
voltage is within the normal operating range. In the event of
ahigh or low bias voltage, the respective LED will light and the
normal LED will turn off. See Section 4.4.2 for more details.
Power Supply/Coupler Type 5118B1 and 5118B2
5118B…_002 − 150e-10.18Page 12
3.5 Low Battery Indication
A comparator circuit constantly monitors the input voltage level.
Should the voltage drop below 4 Volts, an audible “chirp” will
alert the user. Low batteries should be removed or replaced
immediately to prevent damage to the unit.
Fig. 2: Block Diagram
Assembly, installation and operation
Page 13
5118B…_002 − 150e-10.18
4. Assembly, installation and operation
4.1 Unpacking
Unpack the instrument and inspect it for any visible damage
caused during shipment.
4.2 Connections
This section provides information on connector locations for
power and input/output signals. Information on cable types
is also provided.
4.2.1 Signal Connections
Connect the low impedance sensor to the BNC negative con-
nector on the rear panel identified as “Input.” Sensor power
is also supplied via this connector.
The conditioned output, without the DC Bias, is available
from the BNC Negative connector labeled “Output” on the
rear panel of the instrument.
Typical cables used with the 5118B are listed in Table 2. User
requirements may be different depending on equipment ter-
minations and the nature of the installation. Consult the data
sheets for the individual equipment to be connected for the
most complete information. Contact Kistler for cable config-
urations different from those listed.
Type Description
1631Csp Low Noise, 10 - 32 to BNC pos., specify length
1939Asp Low Noise, Weldable 10 - 32 to BNC pos., specify
length
1601sp Low Noise, BNC pos. to BNC pos., specify length
1761C(X) General Purpose, 10 - 32 to BNC pos., specify length
1511sp Output Cable, BNC pos. to BNC pos., specify length
Tab. 2. Kistler cables
4.2.2 Power Supply Connection
Power is supplied via a rear-panel jack; “DC in 6…28V.” The
5118B can be powered with a “wall mount” adapter, which
supplies DC power to the coupler. When using this power
Power Supply/Coupler Type 5118B1 and 5118B2
5118B…_002 − 150e-10.18Page 14
supply, simply plug the power supply plug into the rear panel
jack of the 5118B.
The 5118B is designed to operate from a variety of DC power
sources. This can include a regulated power supply, vehicle
power (automotive, aircraft), etc. If multiple couplers are
mounted in a rack the user may elect to use one common
supply. When using an external power supply, the optional
Kistler accessory cable (55131496) is recommended.
The cable is 6 feet in length, terminated at one end with
a standard 2.1 × 5.5 mm concentric power connector and
pigtails at the other end.
The unit is protected from excessive voltage and polarity
reversal. See section 3.1 for details about this feature.
4.3 Battery operation
4.3.1 Installation and operation
The 5118B can be operated from four, 1.5 Volt, AA size dry
cell batteries. The following batteries can be used.
Battery Type
Carbon-Zinc
Alkaline-Zinc
Lithium-Manganese
Battery Life* (Hours)
10
12
24
* With sensor current set at 2mA
The battery is located in a compartment on the bottom of
the case. To install or replace the batteries, loosen the two
screws that hold an aluminum cover in place and lift it off.
The proper polarity of the batteries is shown in the battery
compartment. Battery reversal, will not damage the coupler,
but will result in short battery life, failure of the coupler to
operate, or battery leakage due to cell reversal.
Warning: Residue from battery leakage should be removed
promptly and thoroughly from any surface with a damp cloth
since it is caustic (potassium hydroxide, KOH) and corrosive.
Caustic burns from alkaline cells must be washed promptly
with large volumes of water and receive immediate medical
treatment to neutralize the caustic effects. Do not get battery
residues in or near the eyes.
Assembly, installation and operation
Page 15
5118B…_002 − 150e-10.18
4.3.2 Battery back-up
If the coupler is going to be operated using external power
(DC source or power adapter), the user may remove or keep
the batteries in the unit. If batteries are installed in the unit,
the user will have the added advantage of an uninterruptible
power source.
The coupler’s internal power supply contains an automatic
power switching circuit. This circuit automatically switches
between the internal batteries and the input power plug on
the rear panel. As long as the input voltage to the rear plug is
higher than the battery voltage, the unit will derive its power
from the external source. Should this input voltage drop below
battery voltage, the unit will switch to the internal batteries
provided the internal batteries voltage level is 4 volts or higher.
In the event that the unit’s batteries are low, applying outside
power turns off the low battery warning.
If batteries are left in the unit during AC operation, the user
should periodically check both the electrical and physical con-
dition of the batteries and observe the caution in Section 4.3.1.
4.4 Front - rear panel controls and indicators
4.4.1 Power switch
The power switch is located on the rear panel. See Section
1.1 for precautions
4.4.2 Bias indicator
All units are equipped with front panel LEDs that display the
unit’s bias voltage level. A bias fault indication can give the
user clues as to possible problems in the measuring system:
The green “Normal” LED indicates that the bias voltage
is within the normal limits of 2 to 21 Volts. The other
LED’s are identified as “Low” and “High.”
A red “High” indication is usually caused by an open or
disconnected cable. If replacing the cable does not solve
the problem, the sensor is most likely defective.
A red “Low’' indication is caused by a short in the cable
or sensor. If a “Low’' indication is detected, disconnect
the sensor. If the bias voltage remains low, replace the
cable. If the bias voltage goes “High” the short is in the
sensor.
Exception Note
Power Supply/Coupler Type 5118B1 and 5118B2
5118B…_002 − 150e-10.18Page 16
The 8614A500, 8616A500, and 8694M1 Model Acceler-
ometers have a lower output bias than standard Piezotron
Sensors. This bias may be below the sensor’s nominally rated
4 volt level and may cause the 5118 Low Bias LED to become
lighted (Red), indicating a short.
The accelerometer’s actual bias level can be checked by using
a voltmeter with an input impedance of at least 1 meg ohm.
The meter must be connected to the input BNC connector on
the back panel of the coupler by using a Kistler Model 1743
BNC Tee Coupling. The accelerometer must also be connected.
A normal operating bias level for the three accelerometers
will be in the range of 2.5 to 5 VDC.
4.4.3 Unit gain
A front panel slide switch “Gain” selects the unit gain. Gain
is either X1 (unity), X10 or X100. When changing gain, the
unit will be ready for operation in 2 to 3 seconds because of
the “Rapid Zero” feature (see Section 3.2).
Increasing the gain effectively increases the sensitivity of the
measuring chain by the factor indicated (X10, X100). As an
example; if an accelerometer has a sensitivity of 10 mV/g
and the 5118B2 gain is set at X10, the actual sensitivity of
the measuring chain will appear as 100 mV/g at the coupler’s
output. There is no significant difference in the noise level
between X1 and X10. The amplifier noise will contribute 5mV
RMS on the X100 range.
4.4.4 Highpass filter
A two position front panel slide switch is provided on the
5118B2 for the selection of the low frequency cut-off point.
This switch is labeled “HP Filter.” A selectable single pole
(-3dB per octave) highpass (HP) filter is included in the Type
5118B2 while the cutoff frequency is fixed at 0.03Hz on the
5118B1 version. This feature allows the user to select the
-3dB low frequency cutoff point (0.03Hz or 0.006Hz.). The
approximate relationship between the frequency (-3dB point)
and the time constant (1:) can be represented by:
f-3dB ≈ 0.16 ÷ τ
Since the -5% frequency cutoff point is generally of greater
interest in sensor applications, the following equation can
be used:
f-5% ≈ 0.5 ÷ τ
Assembly, installation and operation
Page 17
5118B…_002 − 150e-10.18
The time constant (TC) is inversely proportional to the cutoff
frequency. Decreasing the cutoff frequency will increase the
time constant.
For most applications a cutoff frequency of 0.03Hz (TC = 5
seconds) is recommended. The lower frequency provides a time
constant of 25 seconds which is useful for making quasistatic
measurements with force or pressure sensors.
It should be noted that the actual overall time constant is
afunction of the coupler’s time constant and the time constant
of the attached sensor. The actual sensor time constant is
usually measured and furnished on the sheet. The overall time
constant (τTotal) can be estimated by the following equation:
τTotal = (τ1 X τ2) + (τ1 + τ2)
Where:
τ1 = Time constant of the sensor (in seconds)
τ2 = The selected time constant of the coupler
(always 5 seconds for the 5118B1).
4.4.5 Rear panel
The following controls and receptacles are located on the rear
panel of the 5118B going from left to right:
“Output” – BNC connector provides the conditioned
sensor signal for connection to a readout instrument
(oscilloscope, meter, etc.)
“Input” – BNC connector is provided to connect a low
impedance, voltage mode sensor.
An “Off – On” slide switch is used to turn the unit on
or off.
The “DC in” plug is used to furnish DC power if the
internal batteries are not being used.
Fig. 4: Rear panel of the 5118B series of couplers showing
the power switch, power connector and input/output
connectors
/
