Kistler 9285BA Owner's manual

Instruction

Manual

Multicomponent

Force Plate with

Glass Top Plate

Type 9285B…

ä

9285B_002-499e-02.10

Instruction

Manual

Multicomponent Force

Plate with Glass Top

Plate

Type 9285B…

ä

Multicomponent

Force Plate with

Glass Top Plate

Type 9285B…

ä

9285B_002-499e-02.10

Foreword

We thank you for choosing a Kistler quality product

distinguished 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.

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

Eulachstrasse 22

8408 Winterthur

Switzerland

Tel. +41 52 224 11 11

Fax +41 52 224 14 14

[email protected]

www.kistler.com

9285B_002-499e-02.10 Page 1

Multicomponent Force Plate with Glass Top Plate Type 9285B…

Content

1. Introduction ................................................................................................................................... 4

2. Important Information.................................................................................................................... 5

2.1 For Your Safety .................................................................................................................... 5

2.2 ä-Conformity..................................................................................................................... 6

2.3 How to Treat the Instrument................................................................................................ 6

2.4 With External Amplifier (Type 9285B…) .............................................................................. 6

2.5 Hints for Using the Operating Instructions ........................................................................... 7

2.6 What Happens After Modifications? .................................................................................... 7

2.7 Disposal Instructions for Electrical and Electronic Equipment ................................................ 7

3. General Description of the Instrument........................................................................................... 8

3.1 Introduction ......................................................................................................................... 8

3.2 Assembly of the Force Plate ............................................................................................... 10

4. Mounting, Installation and Putting into Operation...................................................................... 13

4.1 General Hints ..................................................................................................................... 13

4.2 Installation Modes.............................................................................................................. 13

4.3 Installing Mounting Frame for Photographic Applications .................................................. 13

4.4 Installing the Force Plate .................................................................................................... 16

4.5 Basic Circuitry and Cabling of the Measuring System ......................................................... 20

4.6 Connections with Built-In Amplifier (Type 9285B...)........................................................... 21

4.6.1 Connector of Force Plate Type 9285B... with Built-In Amplifier............................. 22

4.6.2 Cable Type 1758A................................................................................................. 23

4.6.3 Digital Control....................................................................................................... 24

5. Operation..................................................................................................................................... 25

5.1 Range Selection.................................................................................................................. 25

5.2 Operate/Reset ................................................................................................................... 25

5.2.1 Balance Analysis, Posturography ........................................................................... 26

5.3 Usable Frequency Range.................................................................................................... 26

5.4 Temperature Influences...................................................................................................... 27

5.5 Polarity of the Measuring Signal......................................................................................... 27

5.5.1 x- and y-Directions................................................................................................ 27

5.5.2 z-Direction ............................................................................................................ 27

6. Maintenance ................................................................................................................................28

6.1 Recalibration of the Instrument .......................................................................................... 28

6.2 Weekly Function Check...................................................................................................... 29

6.2.1 System Check........................................................................................................ 29

6.2.2 Drift Check............................................................................................................ 29

6.2.3 Check Gap Around Force Plate.............................................................................. 29

6.2.4 Setup Parameters .................................................................................................. 29

6.3 Maintenance ...................................................................................................................... 30

6.4 Cleaning and Sterilization................................................................................................... 30

Page 2 9285B_002-499e-02.10

Content

9285B_002-499e-02.10 Page 3

7. Troubleshooting ...........................................................................................................................31

7.1 Defective Force Plate ..........................................................................................................31

8. Technical Data ..............................................................................................................................32

8.1 Dimensions and Connections..............................................................................................32

8.2 Technical Data for Type 9285B...........................................................................................33

8.2.1 General ..................................................................................................................33

8.2.2 Built-In 8 Channel Charge Amplifier.......................................................................35

9. Glossary........................................................................................................................................36

9.1 Coordinate System..............................................................................................................36

9.2 Kistler Coordinate System ...................................................................................................36

9.2.1 ISB Coordinate System ...........................................................................................37

9.3 Parameters Calculation........................................................................................................37

10. Warranty.......................................................................................................................................38

11. Declaration of Conformity ............................................................................................................39

Total pages 40

Multicomponent Force Plate with Glass Top Plate Type 9285B…

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.

To the extent permitted by law Kistler does not accept any

liability if this instruction manual is not followed or

products other than those listed under Accessories are

used.

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-

emission

 Strain gage sensor systems for measuring force and

moment

 Piezoresistive pressure sensors and transmitters

 Signal conditioners, indicators and calibrators

 Electronic control and monitoring systems as well as

software for specific measurement applications

 Data transmission modules (telemetry)

Kistler also develops and produces measuring solutions for

the application fields engines, vehicles, manufacturing,

plastics 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 on-line or in this manual, please contact Kistler's

extensive support organization.

9285B_002-499e-02.10 Page 4

Important Information

2. Important Information

Please keep to the following rules without fail. This will

ensure your personal safety when working, and assure

long, trouble-free performance by the instrument.

2.1 For Your Safety

 This instrument has been tested thoroughly and it left

the works in a perfectly safe condition. To maintain this

condition and assure safe operation, the user must

observe the directives and warnings contained in these

instructions

 The force plate must be installed, operated and

maintained only by persons who are familiar with it and

adequately qualified for their particular tasks

 When it must be assumed that safe operation is no

longer possible, the instrument must be taken out of

operation and secured against unintentional use

It must be assumed that safe operation is no longer

possible if:

 the instrument is visibly damaged

 it no longer functions

 it has been in lengthy storage under adverse conditions

 it has received rough treatment during transport

According to safety requirements the following has to be

observed:

Caution!

Please mount the force plate on its foundation

following the instructions in chapter 4 "Assembly,

installation and putting into operation".

According to safety requirements the following has to be

observed:

The force plate has to be connected to earth using the

Potential Equalization Conductor provided in the scope

of delivery to meet the ä-standards regarding Earth

Leakage Current.

The data acquisition computer and persons who are in

direct contact with it have to remain in a distance of

1,5 m from the patient at all times for the same reason.

9285B_002-499e-02.10 Page 5

Multicomponent Force Plate with Glass Top Plate Type 9285B…

2.2 ä-Conformity

The Force Plate Type 9285B… is conforming to ä

directives according to the Declaration of Conformity

enclosed with these operating instructions.

2.3 How to Treat the Instrument

 The force plate may be used only under the specified

environmental and operating conditions

 Protect the signal output against dirt and do not touch

it with your fingers. When the connection is not being

used, cover it with the cap provided

 When the force plate is not in use, protect it by keeping

it in the packing case supplied

 When performing long-time measurements, make sure

that the temperature of the force plate remains as

constant as possible

2.4 With External Amplifier (Type 9285B…)

The insulation resistance is crucially important with

piezoelectric measurements. It must be around 100 TΩ

(but at least 10 TΩ).

To obtain this resistance, all plug and socket connections

must be kept meticulously clean and dry.

The insulation resistance can be measured with the

insulation tester Type 5493.

The connecting cable from force plate to charge amplifier is

highly insulating. Use only the proper cable.

Do not remove the connecting cable from the force plate.

Page 6 9285B_002-499e-02.10

Important Information

2.5 Hints for Using the Operating Instructions

We recommend reading the entire Instruction Manual as a

matter of principle. If you're in a hurry, however, and

you've already gathered experience with Kistler force

plates, you can confine your reading to the information

that you really need.

We have endeavored to arrange these instructions so that

you can find the information you need without difficulty.

Please keep these Operating Instructions in a safe place

where they can be consulted any time.

If the instructions get lost, just turn to your Kistler

distributor and they will be replaced without delay.

All information and directives in these instructions may be

modified at any time without prior notification.

2.6 What Happens After Modifications?

Modifications to instruments result in alterations of the

operating instructions as a rule. In such cases, enquire at

your Kistler distributor about the possibilities of updating

your documentation.

2.7 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.

9285B_002-499e-02.10 Page 7

Multicomponent Force Plate with Glass Top Plate Type 9285B…

3. General Description of the Instrument

3.1 Introduction

The multicomponent force plate Type 9285B… is a

piezoelectric sensor assembly that allows the following

measurands to be recorded:

 The 3 components Fx, Fy and Fz of a force F applied to

the plate

 The 3 components Mx, My and Mz of the resultant

moment vector M relative to the origin of the

coordinate system

Provided no tensile stresses can act on the top plate in the

z-direction, the following can also be determined:

 The 2 coordinates ax and ay of the center of pressure on

the surface of the plate and

 the free moment Mz about an axis normal to the

surface of the plate

The electric charges yielded by the force plate are strictly

proportional to the measurands. They are converted by

charge amplifiers into analog DC voltages for recording,

display or other processing as required.

This force plate has the following special features:

 Wide measuring and frequency range

 High rigidity and hence minute measuring deflections

 High degree of overload protection

 Glass top plate allows photographing of the contact

surface from the underside (at the same time as force

measurement)

 Corrosion-resistant construction

 Connection of force plate with a metal-sheathed 8-pole

cable with multipole connector

Typical applications for the force plate include:

 Biomechanics: gait analysis and animal studies

 Sport: motion analysis and training

 Orthopedics: rehabilitation and fitting of prostheses

 Neurology: posturography and microvibrations

Page 8 9285B_002-499e-02.10

General Description of the Instrument

Fig. 1: Multicomponent force plate for biomechanics

Type 9285B…

9285B_002-499e-02.10 Page 9

Multicomponent Force Plate with Glass Top Plate Type 9285B…

3.2 Assembly of the Force Plate

Assembly of the force plate.

Fig. 2: Cross section through the force plate

1 3 component force measuring elements (force links)

2 Mounting base

3 Pressure pads

4 Hollow bolt

5 Top plate, replaceable

5 Cable channel

6 Flange

7 Decoupling piece

8 M12x50 hexagon bolt with hexagon socket

9 Washer

10 M12x35 fixing bolt with hexagon socket

11 Cylinder head screw with hexagon socket

Page 10 9285B_002-499e-02.10

General Description of the Instrument

Fig. 2 shows the force plate assembly. Each pair of 3-

component force links Type 9067 or 9068 (1) are mounted

between the Force plate frame (2) and the four pressure

pads (3) with four hollow bolts (4)$$, each with a preload of

160 kN. The replaceable top plate (5) is screwed down onto

the four pressure pads (3).

The flange (6) is connected to the pressure pad (3) in such a

way as to avoid any unwanted resultant force on the hollow

bolt (4). The decoupling piece (7) and the hexagon bolts (8)

secure the top plate (5) to the force plate frame (2). The

washer (9) is fitted to reduce the friction on the head of the

hexagon bolt.

The force plate is mounted with four high-strength M12x35

fixing bolts with hexagon sockets threaded through the

hollow bolts.

All of the gaps and openings are filled with Sylgard 170 to

enable the entire surface of the top plate to be used for the

measurements.

9285B_002-499e-02.10 Page 11

Multicomponent Force Plate with Glass Top Plate Type 9285B…

Fig. 3: Assembly and dimensions

Page 12 9285B_002-499e-02.10

Mounting, Installation and Putting into Operation

4. Mounting, Installation and Putting into Operation

4.1 General Hints

The force plate Type 9285B… is a measuring

instrument whose accuracy can only be fully exploited

if it is mounted and handled with appropriate care.

In particular, it must be mounted exactly to

specification to avoid being damaged by overloads

(such as excessive internal stresses, etc.).

For nonobservance of the mounting instructions Kistler

will decline all responsibility.

4.2 Installation Modes

The force plate Type 9285B… may be set up in position in

principle.

The special advantage of piezoelectric force measure-

ment – minimal measuring deflections even with the

highest forces, i.e. high rigidity – requires mounting the

force plate on a suitably rigid and level surface.

4.3 Installing Mounting Frame for Photographic Applications

A great advantage of this force plate is that it offers the

possibility of photographic observation from below the

measuring procedure. Fig. 4 shows a special mounting

frame for this purpose.

Procedure for grouting-in the Type Z12627 mounting

frame

 Position the frame on the prepared concrete base,

centered on it's recess

 Level off the frame in height so that the force plate

surface is flush afterwards with the surrounding surface,

allowing for any covering to be added later

 Grout-in frame with synthetic resin mortar:

 not higher than top of square tube

 not lower than about 5 mm above U-profile

9285B_002-499e-02.10 Page 13

Multicomponent Force Plate with Glass Top Plate Type 9285B…

Important

The force plate is not suitable for outdoor use.

 A gap of at least 2 mm must be left free between the

force plate and the surrounding floor. Floor coverings

such as Tartan or other types of surfacing must also be

interrupted at the edge of the force plate to avoid a

force bypass

Page 14 9285B_002-499e-02.10

Mounting, Installation and Putting into Operation

Fig. 4: Foundations with mounting frame for

photographic applications (suggested

arrangement)

9285B_002-499e-02.10 Page 15

Multicomponent Force Plate with Glass Top Plate Type 9285B…

4.4 Installing the Force Plate

Once the mortar has set, the plate (and any mirror) can be

mounted.

Mounting procedure (see Fig. 2 … 6)

The assembly must be prepared for mounting by removing

the glass top plate, the decoupling pieces and the flanges

one after the other:

 The glass top plate is screwed down onto the flange

(item 6 in Fig. 2) with an M12x50 hexagon bolt (item 8

in Fig. 2). After undoing the four screws with hexagon

socket the top plate can be lifted off by the included

eyebolts

 The four decoupling pieces (item 7 in Fig. 2) between

top plate and flange can now be removed

 To gain access to the fixing bolt (item 10 in Fig. 2), the

flange (item 6 in Fig. 2), which is attached to the

pressure pad (item 3 in Fig. 2) with six cylinder head

screws (item 11 in Fig. 2), must be removed

 The M12x35 fixing bolt (item 10 in Fig. 2) is now

accessible and the force plate frame (item 2 in Fig. 2)

can be mounted on the mounting frame

Fig. 5: Mounting frame onto base support

Page 16 9285B_002-499e-02.10

Mounting, Installation and Putting into Operation

Mounting force plate

 Lay the force plate frame on the mounting frame in its

mounting position as shown in Fig. 5:

 Press down on alternate diagonally opposite

corners of the force plate frame to check whether

it is lying evenly on the mounting frame. Any

rocking is clearly evident

 If rocking is felt, the force plate frame must be

raised and one of the included shims inserted

underneath. If the thinnest shim is too thick, a

piece of aluminum foil may provide a suitable

remedy. Only ever shim frame at one corner

 After carrying out the above steps connect cable and

screw the force plate frame down on the mounting

frame with the included M12x35 fixing bolts (item 10

in Fig. 2) (Ttightening = 90 N·m)

A hexagon socket key for tightening the M12x35 bolts to a

torque of 90 N·m is included. Screws and bolts must be

greased sparingly.

 Once the force plate frame has been mounted on the

mounting frame the retaining bar can be removed

 Each of the flanges (item 6 in Fig. 2) is now attached to

the force links with the six cylinder head screws (item

11 in Fig. 2)

 The decoupling pieces (item 7 in Fig. 2) must be

carefully positioned before the glass plate is mounted

 The top plate (item 5 of Fig. 2) is then carefully located

on the decoupling pieces. The top plate can be raised

and lowered by the included eyebolts. Four threads are

provided in the steel inserts in the surface of the top

plate

 The four washers (item 9 in Fig. 2) are then inserted

and the top plate secured with the four M12x50

hexagon bolts (item 8 in Fig. 2)) (Ttightening = 60 N·m).

The bolts must be greased sparingly

9285B_002-499e-02.10 Page 17

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