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MANUAL

CONTROLLER SLIDE BAA

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----------------------~-------

Operating Instructions

for the HD 050 Controller and the Slide bar KMS 560

Page

Switch-on menu, address menu, general set up N-I

Manual inputs

- Direct positioning N-2

- Position assignment N-2

- Step mode N-3

- Storage of device settings N-4

- Call up of memory positions N-5

- Sequences N-5

-STOP N-6

-REM N-6

- Error messages N-6

- SET UP N-7

- IEC-Bus Commands N-8

--------------------~------HD 050 Controller

The HD 100 Controller is suited for the operation of

Slide bars Turntables

and equipment which is developed customer-specific.

It permits the operation of these devices

Manually Semi-automatically

and remote-controlled via the IEC bus.

In manual operation, the devices connected can be moved by using arrow keys, for example the antenna can be moved up or down. It is also possible to input target positions with the numerical keyboard and to start the movement.

A STEP mode facilitates the movement of the device stepwise.

F or masts, turntables and slide bars, there are SET UP menus which permit initialisation and the displacement of the limits of movement. Here the rotating speed of the drive motors can be changed in several levels.

Individual positions can be stored in a memory and approached automatically again by calling up the number of the memory.

Several such stored positions can be joined together in a SEQUENCE which is then carried out simply by pressing a button.

All inputs are subject to a syntax check and displayed as an error if appropriate. Erroneous commands are not carried out.

All commands except STEP and SEQ can also be transmitted via the lEe bus.

Switch-on Menu

After switching on, the Switch-on menu appears in the display:

I-------HD-- 050 GPffi",Adr: 7

MM5014.4

This menu remains displayed for 3 sec., after which the main menu is displayed.

Adress Menu

If the REM key is pressed when switching on, the GBIP address menu appears:

! GBIP! ADRESS: 7

By inputting a number and transferring with ENTER (yellow key), a new IEe bus address is set. The controller then goes into the main menu automatically.

General Set Up

If the SET UP key is pressed when switching on, a complete set up is started. The description of the different set ups see at the special chapter. If the general set up is finished, the display shows the main menu.

-------------------------------------i-I:)N-_-2---------

Direct Positioning

The arrow keys <-- --> can be used to move the devices selected directly.It is possible

to travel only within the limits of movement which have been set. If the end position is

reached, the movement is stopped and the display blinks.

Position Assignment Using the Keyboard

The numerical keys can be used to assign a target position (setpoint).The POS Key is to

be pressed first for this. The following appears, for example (antenna mast mode of

operation):

345 em em

The cursor is located on the first position of the input field < Setpoint >. By pressing on

one of the number keys, the display of the input field < Setpoint > can be changed. Only

whole cm can be input.

By pressing the <ENTER> Key, the verification and implementation of the command are

initiated. It is first checked to determine whether the input is valid or not, meaning that the

value may not be smaller than the lower reference point (depending upon the KMS, this

value is stored in the SETUP menu) or larger than the KMS length. If the value is wrong,

the Error menu is called up and the message appears in plain language (Code 01/02). If

the value input is correct, the antenna support travels to the setpoint and the actual value

is measured continuously and displayed in the input field <Actual value>. After reaching

the target position, the value in the input field <Setpoint> is deleted.

i-I:)N-.-3----------

Step Mode

Every device can be operated stepwise, meaning in steps. To do this, the STEP Key is to be pressed first. For example, the following appears: (Turntable)

I Requ. . Step

523 em . 6 em

A minimum step width is prescribed for every device. With the numerical keys, every step width can be set, which is larger than the minimum value and smaller than the maximum of the line. The value is transferred with ENTER.

"CONTINUE" is used to select whether the device is operated continuously or in the step mode. In the step mode, the step width set appears in the STEP field. Otherwise, this field remains blank.

f-i:)N-_-4---------

Storage of the Device Setting

Press the STO Key

Storage of a position setting Storage Number: n

A position will be stored. The number "n" identifies the memory number under which the setting is stored. The memory places must be filled continuously. For this reason, the largest possible memory number is displayed. It can be accepted with ENTER. By inputting a number which is smaller than the one displayed, the setting can be stored under any desired number.

The following appears next:

I Save _ No.: 1

The desired position can now be input. It is then stored under the memory number selected.

F or example,

I Save Requ. 120cm

The desired position can now be input. It is then stored under the memory number selected.

A maximum of 20 settings can be stored.

Call-up of Stored Positions

Press the RCL Key

Setting No.: n

After inputting a memory number under which a setting has been stored, the values stored appear in the first line.

If ENTER is pressed as long as this value appears on the display, the device moves to the position stored.

Sequence

Press the SEQ Key

I SEQUENCE:

To store a sequence, enter the numbers of the desired settings, separated by a"-". After the last setting, the input is concluded with ENTER. A maximum of 10 steps can be input. If a sequence has already been input, it appears on the display. It can be accepted with ENTER. Every other key deletes the sequence stored. The following appears:

I SEQUENCE 1-2-3

By pressing ENTER, the values of the settings are transferred to the controller as the setpoints and the device moves to the position stored. The initial menu appears during this sequence and the actual values and the setpoints are displayed. When the device reaches the desired position, the above menu appears again. The next setting appears at the first position. All further settings input are called up again using ENTER. With STOP, it is possible to terminate the sequence and the device is back in manual operation again.

------------------------------------i-I:)N---6---------

STOP the movement

Press the STOP Key

The motor can be stopped at any time by pressing the STOP Key and the device remains standing still. Work can continue as usual afterwards.

REM

Press the REM Key

In manual operation, this key has no effect. In IEC bus operation, the yellow LED lights up. Pressing on this key switches to manual operation.

Error Messages

With inputs which are syntactically incorrect or unknown, a switch is always made to the Error menu. The error messages are identified with a code.

ERROR-NR: 1 INPUT VALUE TOO LARGE

ERROR-NR: 2 INPUT VALUE TOO SMALL

ERROR-NR: 3 INVALID VALUE

ERROR- NR: 4 UNIT DOES NOT REACT

The display remains visible for approx. 3 sec.

SETUP

Press the SET UP key

INIT start: <ENTER>

After pressing the ENTER Key, the glider moves backwards from the present position until the

back limit switch is actuated. The most recently stored position is taken as the current position and

displayed.

The procedure can be interrupted with the STOP Key. The input of the maximum values then

appears next. The glider is not moved.

The minimum and maximum values for the glider movement can then be input.

INIT MIN Oem

If a valid value is input, the next mask appears.

MAX !NIT

541em

The values are only accepted if they lie within the mechanical limits and if the minimum value is

smaller than the maximum value.

Now the mask for the speed value appears.

I SPEED !NIT

5

Valid numbers are 1 to 8.

After the initialisation, work can continue manually or via the IEe bus.

lEC Bus Commands

General

- All outputs through the IEC bus are five characters long,

followed by Line Feed (OAR). Missing positions are filled

with blanks (20H). - All values are transferred in CM. - Negative values are not allowed. - The commands, values and units must be transferred in

capital letters and separated by blanks. - No more than 32 characters may be sent in one transmission.

- The Line Feed or the EOI can be used as an end character

(CR will be ignored).

Registers

The IEC bus interface of the control device has several registers

available. By transmitting the register name, the register is made

the current register. If the device is addressed as TALKER, it

outputs the contents of the register set. If a value has been loaded previously with LD, it is accepted into

the next following register.

Input and output Registers

These registers can be assigned a value with the LD command. They

can be read out when the register name is received and the control

unit is then addressed as TALKER.

FL

BL

CP

GP

NP

SP

Front Limit This cannot be larger than the physical lenght of the

slide bar and may not be smaller than o.

Back Limit This cannot be smaller than 0 and may not be larger than

the front limit.

Current position

Glider position Switches the IEC bus interface to slide bar, so that

every command following which is not clearly refered to

a specific device is refered to the slide bar.

Next position Setpoint for the GO command

(speed) speed with which the device moves Valid numbers are 1 to 8 (e.g.: "LD 5 SP")

output Register

This register can only be read.

BU (Busy) Motor status 0: Motor is off 1: Motor is on

This register indicates whether the motor and thereby also the glider are presently being moved. For mechanical reasons, the motor cannot start immediately after the receipt of a start command. It is therefore necessary to wait until the motor moves (BU = 1), before it is possible to enquire with BU whether the previous command has been completed. If the glider is already located in the desired position when a GO command is received, BU will nevertheless be set on 1 for approx. 0.5 sec.

Command to Load the Registers

LD nnn eM - Load the value nnn into the register following.

Commands to Control the Slide bar

FO

BA

GO

Moves the glider forward until the front limit is reached or a STOP command (ST) is received.

Moves the glider backwards until the back limit is reached or a STOP command (ST) is received.

Moves the glider to the position which is in the setpoint register (NP). In the calculation of the

distance to travel, the run-out of the last movement is taken into account, so that the positioning is more accurate than it would be through a continuous evaluation of the current position.

Error Messages

E - P:

E - S:

E - V:

E - D:

(Power) Is sent after a loss of mains power

(syntax) Is sent when an invalid command is received

(Value) Is sent when a value does not lie within the valid limits

(Device) Is sent when the device no longer reacts, meaning that the motor does not move in spite of the control.

Operation of More Than One Device with One control unit

Similar commands and registers exist for all devices which can be operated with the control device. Some of them are identical for all devices (LD CP NP GO BU) . If more than one device is operated with the same control unit (e.g. antenna mast and slide bar), the control device must first be informed of the device to which the following commands apply. This is done by transferring a register or a command which refers clearly to this device.

For the slide bar, they are the following:

BL FL BA FO GP

A command sequence such as

"BL LD 140 CM NP CP GO"

has the effect that the glider moves to 140 CM and the current glider position can be read out, even if another device (e.g. the table) has been addressed previously.

program Example (for HP-87 GPIB)

The following small program loads the front and back limits, then travels to 140 CM:

OUTPUT 708,"LD 534 CM FL" OUTPUT 708,"LD 0 CM BL"

setting of the limits

Load the setpoint, set CP as the current register for the output, travel to the setpoint

OUTPUT 708,"LD 140 CM NP CP GO"

Indicate the current position on the screen LOOP: INPUT 708,A$i DISP A$

IF VAL(A$) <> 140 THEN GOTO LOOP

It is better to interrogate the Busy Flag (BU). Because of the correction of the mechanical run-out, the setpoint might not be reached exactly.

The program would then read as follows:

OUTPUT 708,"LD 534 CM FL" OUTPUT 708,"LD 0 CM BL"

setting of the limits

Load the setpoint, set BU as the current register for the output, travel to the setpoint

OUTPUT 708,"LD 140 CM NP BU GO"

wait until the motor moves WAIT: INPUT 708,A$

IF VAL(A$) <> 1 THEN GOTO WAIT wait until the command is carried out LOOP: INPUT 708,A$

IF VAL(A$) <> 0 THEN GOTO LOOP

- -, ~'- -~ ~--' '---------- 1-0 .1 n.Q.en.i.eu.r.-.B.ur.o

Heinrich Oelsel

SERVICE MANUAL

for

SLIDE BAR KMS

SME KMS

lng, BUra H,Oeisel Pdtt ing 1 0-82024 Taufkirchen Tel, 089/6128464 Fax 6128653

1.4 SLIDE BAR KMS 560

Technical Data

Measuring lenght Total lenght Height Material KMS cross-section Base L x W

positioning speed Positioning accuracy

Slide bar drive Motor Control Drive unit

Temperature range Working range Current consumption Voltage

Accessories

6.00 m 6.48 m 1.05 m PVC, weatherproof 11 cm x 11 cm 0.3 m x 0.3 m, adjustable to the same height

min. 1 m/25 sec. max. 1 m/7 sec. +/- 2 cm

2 toothed belts electronic motor using relay, open collector radio interference suppressed

-25°C ... +500C - 5°C ... +40oC max. lA 220V/50Hz

3 m power supply cable 10 m control cable

0-1

1) 25R lazy

SU8-0 PLUG COLOR NR.

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gre~ 7

pink 13

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blue 3

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block 11

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brown 2

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Benennung

DRIVE-ELECTRIC Ze i chn. -Nr ., KMS-560 - 04 Datum I Nome I Mallstob,

12.921 H.Dei -1-0-Dotei

BLOKMS-E

SET-UP AND COMMISSIONING OF THE SLIDE BAR

Set up the slide bar at the location of the measurement.

Set up the drive foot and free the toothed belts from the transport attachment.

Lay the upper part of the toothed belt toward the back and pull the lower part through the first part of the rail. Place the rail onto the drive head and attach the connecting plates, supporting the rail end thereby. Follow the same procedure with the other rail parts and the end foot. The slide bar can be adjusted horizontally on the centre feet. Tighten the positioning screws afterwards.

Attach the absorber clamp to the toothed belt.

Adjust the tension of the toothed belt with the tensioning screws on the end head. The belt tension is correct when the absober clamp can be raised approx. 10 cm in the centre of the slide bar without great effort.

After connecting the power supply line and control line to the control device, the slide bar is ready for operation and can be operated in accordance with the instructions.

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--------------------HI)------CARE AND MAINTENANCE

If dirty, clean the surfaces with a household plastic cleaner and a soft cloth.

After lengthy use, tracks from the runners can be seen. These should be removed with spirit occasionally.

Attention: Do not use solvents for cleaning!

Pay attention to dirt on the toothed belts and clean when necessary. The toothed belts must be operated without lubrication.

After lengthy use, the transport toothed belt at the reversing foot needs to be tightened. For that purpose, loosen the 4 bearing screws and remove the tensioning screws until the belt tension is correct. Thereby the absorber clamp should be moved. Tighten the 4 bearing screws afterwards.

ATTENTION! Approx. every 200 operating hours, the axles of the runners on the absorber clamp and on the drive head and reversing head must be lubricated with a conventional machine oil, whereby no oil should reach the running surfaces of the wheels.

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PIN OCCUPANCY SLIDE BAR DRIVE

SUB-D plug Pin signal Description 1 ' , 2 limit switch back approx. lmA 3 4 5 6 7 le-ri open collector relay approx. 20mA 8 9 limit switch front approx. lmA

10 pulses approx. lmA, max 1kHz 11 earth 12 13 SPEED 14 15 start open collector relay approx. 20mA

FUSES

Mains power fuse: Motor card:

T, lA, 250V (lazy) M, lA, 250V

160

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Zeichengenehmlgungs-Auswels der VDE-Pri.itstelle

VDE-f'riifstelle, MerianstraSe 28, ~ OIfBnbach

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funk-Entstorfilter

Typenbezeichnung Nenninduktivitat Nennstrom Nennkapazitat A/4o Cel

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Die mit x, y gekennzeichneten Stellen der Typenbezeichnung sind freigehalten f'ur die Angabe der Anschl~Bvariante und der Befestigung:

n X n

n y n

Fortsetzung siehe Blatt 6

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ISATEL MDS21 clam application ISATEL Emitec AG (switzerland)

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402>~7 . fO g;8 Software Operation - Manual

ISA TEL Emitec AG (0 a.d. 30.11.1994 page 1 /1 ~

Index

Chapter Discripti(

1.1 Installatio -------1.2 Installatior

1.3 Parameter,

2. New Functic

3. Discriptions c

5.1 Application DE 5.2 Application wit --

ISATEL Emitec AG "'a.d.

1.1 Installation Software

Copy all files from Disk to a directory of the harddis For example:

1.) "md ISATEL" (to make Directory on Harddisk

2.) "Copy a:\*.* c:\ISATEL"

1.2 Installation Hardware

Discription:

Clamp

__ '=-=1 ~[= [.-/'T D' eIsel-Controller

Computer

The DEISEL Controller is connected to RS-232 port of the comJ:. or Com 2).

The connection of the wiring, is discriped in lvfanual of the Com, DEISEL.

ISA TEL Emitec AG " a.d. 30.11.1994

1.3 Parameter Setup

The Setup of the serial port, which the controller is using, is defined in the files * .sId.

For example IOpoint.sId:

You can edit this file with a normal editor (like "edit.com" from MS-DOS 6.xx

Now you could change the COM 2 to COM I!

Attention: If you edit a jile,just overwrite it, do not move { positions in this text file!

ISA TEL Emitec AG ~a.d.30.11.1994 page 4

Also in this file you can edit the following parameters:

- Default limits for start and stop positions

- To move the clamp back, after the measurement j to start position to save time! To be ready for the measurement. (HOME Position Yes/ No)

- To edit the positions, where the clamp has to driv

Use a normal DOS editor (or compatible). If you need he that, look in your DOS Manual, how do use it!

If you have to make a new file, just rename the old one (~ with an other name!)

Edit Limits: Lower Limit is normal by 0 (cm) Upper Limit is at least the last position + 2

Home (Position): YES or NO

Positions: There are Max. 10 Positions, which can be defined. The Positions are entered in cm I s

Important: Before you run the Software, you have set mode Com of the port you are using (Com1 or with the same serial parameters as the L Controller has! (see also the PMM8030-M Plotter). Also contact the DOS-Manual.

ISA TEL Emitec AG ~ a.d. 30.11.1994 pagE

2. New Functions .

2.1.1 Save Setups

To store complet settings of the Software, like: - Start- / Stop - Frequencies - Limit Lines - Detectors - Default settings - and more

2.1.2 Preprogramm the positions of the clamp

- Define the Positions, where the clamp has to be aut, moved.

- Display of the clamp position.

2.1.3 Macro - Functions

- Loads automaticly 2 Setups and then making measurement - Writes automaticly frequencies, which are above the limit 1

the table.

2.1.4 New Displays

- Shows the preprogrammed clamp positions - New graphic for the Bar-Display, to see the bar also from a

distance of5m, away from the Computer-Monitor.

ISA TEL Emitec AG '" a.d. 30.11 .1994 pagE

2.1.5 Opeakdelay Measurement

Makes several independent Quasi-Peak measurements in sequence. If the value is OS, than it makes 5 measurement: stores the measurement with the highest value.

2.1. 6 Printout through Win Word

For better quality of a Test-Report, it is now possible to in the data (measurement curve) into WinWord, as a Plot-File. Sc also simple to manage all the Test-Reports, just in using the Manager of WinWord. Also, it is possible to have Logos ir report and create a WinWord macro for the test-report.

ISA TEL Emitec AG "'a.d.30.11.1994 page 7

3. Discriptions of commands

2.1.1 Save / load Setups

Through the MENU "File":

"Save Panel" to store settings

"Load Panel" to load stored set

2.1.2 Preprogramm the positions o(the clamp

Look under the chapter 1.3 Parameter Setup

2.1.4 New Displays

See in the Manual Mode Menu or when you are USII "Qpeakdelay" Function

ISA TEL Emitec AG '" a.d. 30.11.1994 page

Shows the display, when the clamp is moved automatic:

Clamp Position

Preprogrammea Clamp-Positions

2.1.3 Macro - Functions

The macro ( automatic sequence) is executed by pressing the function Key "FS"

AUTOSEQ.MAC is the file, which defines the sequence.

Again, use a normal DOS-Editor to edit the File.

The 1. line (FirstSetup) loads the setting with the name "First"

ISA TEL Emitec AG ~ a.d. 30.11.1994 page 9

and starts the measurement and when this is done, it loads the setting

The 2. line (SecondSetup) loads the setting, with the n "Second" and after this measurement the sequence is finish.

Sound is an option to tum the beep on when writing to the t (YES or NO).

Note: Do only edit the second column!

2.1. 5 Opeakdelay Measurement

Use the "/" Key to access the "parameter" menu

ATE L E ~ i tee AG

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Enter the command "QpeakDelay 05" to have 5 measurements one!

ISA TEL Emitec AG <. a.d. 30.11.1994 page 10/

This works only when the CISPR detector is activated III t

Sweep Menu.

Is the value less then 02, there will be no Bar-Display to look i the maximum in clamp measurement mode!

2.1.6 Printoutthrough WinWord

File "Plot" use the command "PlotFile" to store the graphic file ( Harddisk, which you can import into WinWord.

In WinWord, use the Command "Graphic" in the Menu "Insert".

PMM 8030 ombien101 noise

30 100 MHz dBuV

10Ce l'

1 : : : i : : :::: : 1 : : I

~~~]~~i~ljIH~~~~~~[;~::~-r~::IJ:f±l~l~l ,. =::::::+::::=i:~~:+=i:j:i::::::::::::::::i::::. :::j::::::r:~::fil:n::l ' --------~-m--~----·r--:---~:--------;i--;~---.lC;I----,m7--------~---C ,:1: ttr I:-~-

Limit: CISPRB3M Title: NOISE Dale: 12-06-1994

If you have any problems with importing the graphics, make sur' that WinWord has the PLT-Filter installed!

ISA TEL Emitec AG ", a.d. 30.11.1994 page 11 / ':

4. Applications

4. 1 with DEISEL Controller

Two ways to make the measurement : - a.) Using the sweep or - b.) Using the frequency table function

With Sweep Function

- Takes longer - Very accurate

Clamp drives to the 1.Position

Makes the 1.Sweep (from start to stop)

Clamp drives to the 2.Position

Makes the 2.Sweep (from start to stop)

At the End Worstcase of all measurements

ISA TEL Emitec AG

With Frequency Tab Function

- Very fast - Difficult to find the freque - See also next application

Clamp drives to the 1.Position

Stepping through frequency table

Clamp drives to the 2.Position

Stepping through frequency table

At the End Worstcase of all measureme

.' a.d. 30.11.1994 page

How to Setup the Parameters:

1.) To setup the table or the sweep menu, look in the Operational Manual the PMM 8030 EMC Receiver.

2.) Activate the right table for the positions of the clamp. Use the comma; "Slide Bar" in the Tab Menu and choose the file. (see below).

When you have chosen the file, it shows the parameters of it! (see below)

E ~ i tee AG 8 e 3 e

ISA TEL Emitec AG "a.d.30.11.1994 page 13/

Unload the Position table:

Use the Sweep Menu and activate the command "Add" and "Y" for unloa(

ISA TEL Emitec AG <" a.d. 30.11.1994 page 14/

4. 1 Macro function application

We would like to make an Emission-Measurement with the simple as possible. To do that, we use the macro.

Principle:

L) First we have to find all the interference Emission-Sigr which are above the limit.

2.) Then we write all this frequency into the table.

3.) Then we measure again, but with the frequency table clamp over the cable to find the maximum level of all the si

Basics:

L) We have to place the MDS-Clamp as near as possible to tl we can also measure the high frequencies.

2.) If we place the Clamp near the EUT, we make a measureml frequencies (from 30 ... 100MHz).

Solution: We have modified a limit, which takes care about (MDS]RE)

3.) So we have to change the limits. One Limit for the Pre­normal limit.

4.) To find the peaks we use the Peak-Detector and for aceun we have to use the CISPR-Detector.

5.) To make the allover Error as low as possible, we have to normal measurement only takes the value at this time photograph). If we have an EUT like a machine, which different Cycluses, then perhaps we measure at the wrong mo purpose we have the "QpeakDelay" Function, which take: frequency, as many complet measurements, as you have measurement takes around 2 seconds.

ISA TEL Emitec AG '" a.d. 30.11.1994

Procedure with the Macro:

Name: Tabel: Setups:

Limits:

Stl1> Action

AUTOSEQ.MAC AUTOTAB First Second MDS PRE MDS21

What happens?

1 Press "FS" It starts the macro, Setup first will be loaded: - Start/Stop Frequency and Frequency-Step - Limit MDS Pre - Peak Detector

2 The measurement starts

3 Every frequency, which above the limit we be the "Frequency-Table"

4 Sweep is - New limit line will be loaded (MDS21) finish - QpeakDelay will be set to OS

- The Frequency-Table will be loaded - The CISPR Detector will be used

S Stops at the -Now the Bar is shown frequencies - Move the c1map, until you reach the maximu

- Then press "ENTER"

See attached pictuture!

ISA TEL Emitec AG "'a.d.30.11.1994 pa

All the frequencies, which are above the limit, are automaticly entered Table.

Below you see the Bar-Display, which shows you the measurement-sigr while moving the clamp for the highest value.

ISA TEL Emitec AG ~a.d. 30.11.1994 page

Example for Plot-File:

PMM 5030

On the left side: The blue part of the signaL variation of all the measure which were taken at the frequency. The stored value is the maxin all measurementsl

EUT is switched on, looking for the Maximum with the clomp MHz

85.9 100

, , ~~---- ... ---------------... ---------------------------------------------.----------------------------------------------, , , , , , -----_.0._-------------_ .. _------------------------------____________________ . _______________________________________ _ , , , , , , -----_ ... _-------------_ ... --------------------------------------------.--------------------------.---._-------____ MM· , , , , , , -----_.0..-------------_ .. _------------------------------____________________________ . ______________________________ ._ , , , , , , _____ ..... _~ ____ w__ _ ___ ... __________ • __________________________________________ w _____ • ___________________________ w ___ •

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:: j E; =:: :::::=_::::::::=:::::::::::::::: ::::== =:::::::::::::::= Limit: MDS_PRE Title: NOISE Oot~: i 2-06-1994

© ISA TEL Emitec AG (Switzerland)

ISA TEL Emitec AG .. a.d. 30.11.1994 pagE

ABSORPTIONS-MESSWA"NDLER -ZANGE ABSORBING CLAMP 49 SYSTEM MEYER DE STADELHOFEN/LUTHI

Einsatzdampfung Insertion loss

Empfa nger-Ei ngangswiderstand

Receiver Impedance 50 Ohm

db (pW) = db (~V) + Correction

MDS21

F. N r. 942504

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, +ll I I , I I iii 3 I ! I I 2 db I I I I 1 . 22 ~ I 0 177 21 i I 1

20 I 2

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30 60 90 120 150 180 210 240 270 300 400 500 600 700 800 900 1000 MHz

03.12.94 ,L..'

A B S 0 RBI N G C LAM P M D S

System Meyer de Stadelhofen/Llithi

The measuring device for the interference capability in the metric wave-band (30 ... 300, 1000 Me respectively) of mains­operated electrical appliances

In connection with a measuring receiver according to CISPR, Publ~6, the absorbing clamp MDS enables to measure the interference capability of radio interferers, such as domestic appliances, electric tools etc. directly; viz. by measuring the power generated by the interferer and fed to its supply cable.

At the plenary meeting in Stresa in 1967, the International Special Commit­tee on Radio Interference (CISPR) adopted the measuring method developed by Mr. Meyer de Stadelhofen and his staff in the department for research and development of the Swiss PTT (1) as a standard ~ethod for the metric wave­band. It has decided to insert same as paragraph 4.1. 3 in its Pub1. 2.,' The, relevant text makes part of Doc. CISPR (Bureau Central) 338 published in January 1968, describing the new measuring device as well as the method of calibrating it. Exact instructions for procedure are given as well. In addi­tion to that, Doc. CISPR (Secretariat) 727 states the history of the develop­ment of this new device and also mentions the investigations made in various countries.

The measurement'of the interference power is substituted for the measurement of the interference voltage at the terminals of the interferer connected to an artificial mains network, and for the field-strength measurement resp.ect­ively.

Measuring with the absorbing clamp MDS is simple, reliable and, if the inter­ference source is constant, well reproducible. It is easier to measure the power generated by the interferer than the field-strength. As the absorbing clamp MDS is not influenced by the presence of stray interference from other sources, no screening cabin is necessary. It is especially noteworthy that a changement of the surroundings of the appliance to be measured, which was

/

essential for the previous procedures, is no longer influencing the test re-sults.

Principle

The interference energy is mainly radiated from that part of the mains cable which is next to the interferer. By convention, the interference capability is defined in terms of the power which would be radiated by a tuned aerial located in the same place as the mains cable. This power is almost equal to

- 2 -

that fed to an absorbing device joined to the mains cable and distanced from the interference source so that it absorbes the maximum power at the specific frequency the receiver is set at.

When a generator with a source impedance of 50 ohms supplies a suitable load, its terminal voltage expressed in dB (pV) has the same numerical value as the power input in dB (pW) increased by the constant 17. If the measuring device between interference source and receiver effects a damping of 17 dB over the whole measuring range the power generated by the interferer can be read in dB (pW) directly on the measuring receiver calibrated in dB (pV).

The absorbing clamp MDS is based on these considerations and enables to measure the interference power in the frequency range from 30 to 300 (1000 respectively) MC directly. The exactitude is within ± 3 dB, which is suffi­cient in most cases. Whenever an especially exact measuring is necessary, a correction can be taken out of the calibration curve supplied together with the device.

The absorbing clamp is calibrated in accordance with the substitution method.

construction

The device consists of a great number of ferrite rings surrounding the inter­ferer's mains cable. These rings are arranged in a straight row, and some of them are components of the coupling transformer. The output voltage is pro­portional to the high-frequent current in the cable. The voltage is measured by an interference measuring receiver. The result is uninfluenced by the operating current in the mains cable as the currents, being in opposite di­rections, compensate. A coaxial filter stops the high-frequent interference currents which could circulate via the screen of the cable between the ab­sorbing clamp and the receiver.

The ferrite rings are split into half-rings, one half being fitted into the lower part of the body of the device and thus forming a channel in which the mains cable of the appliance can be laid. The other half of the rings are arranged in the hinged top part of the clamp. Each half-ring is set in a re­silient plastic-holder moving in guide slots. As soon as the clamp is locked with the. handy eccentric closures providing the necessary pressure, the mag­netic circuits around the cable are closed. The clamp is equipped with four rollers which guarantee a slight shifting for regulating to the maximum.

Other possibilities of application

The absorbing clamp MDS can also be used for investigating the effectiveness of the screening on coaxial cables (2).

Moreover, it can be used in the reverse direction to inject a jamming signal into the screening of a receiving aerial cable in order to measure its im­munity to external fields.

- 3 -

(1) Technical Information PTT 3-10G9

J. Meyer de Stadelhofen/Bersier: The absorbing clamp - a new method

of measuremerit for the interference in the metric wave-band.

(Original in French)

(2) Technical Information PTT 5-1971

R. Bersier: Measurement of the electrical immunity of coaxial cables

. in the metric wave-band by moans of the absorbing clamp MDS.

(Original in French)

Type MDS 21

Device in the form of a clamp. It is suitable for interference measuring

services and laboratries which have to measure the interference capability

of numerous various appliances. The hinged top part of the clamp can be

opened and the mains cable of the interferer be laid in the channel formed

by the split half-rings. After locking the device the magnetic circuits are

closed, and the arrangement is ready for measuring. For regulating to the

maximum the clamp is equipped with four rollers for a slight shifting.

Frequency range from (30) ... 47 up to 1000 Me

Passage for cables up to 18 mrn diameter

Outside dimensions approx. 80 x 100 x 618 mm

Net weight 6.6 kg

Robert LUthi GmbH Hochrain 40 CH 2502 BIEL Switzerland

INSTRUCTIONS FOR USE

11 10(

L2

3 1

jt> 2 1 -Q-Q D .....J IL t

&J

0 4

1 Interferer 2 Extended mains cabl e

3 Absorbing clamp HDS 4 Measuring receiver

f min Llmin according to CISPR

30 MC 5.5 m 5 Auxiliary source of

40 MC 4.2 m interference

50 MC 3.5 m

1. The bipartite bushing fastened to the absorbing clamp has to be removed for measuring interferers with a mains cable whose diameter exceeds 10 mm. This bushing incr(~asr~" '.::hQ exactitude when measuring interfer:ers with thin cables.

2. The interferer 1 is placed or: an insulating base (measuring bench). The mains cable 2 has to be extended to the length of at least Ll according to the lowest interference frequency to be measured and must be laid in a straight line. It must be located at a distance of at least 0.7 m from any conducting wall or above conducting floors. After having laid the cable into the channel of t~e absorbing clamp 3, the latter is locked with the two eccentric closures. Turn the transformer side (green mark, bushing) towards the interferer.

3. Set the measuring receiver 4 at the relevant frequency (for example the lowest) and set the interferer in operation.

4. Move the absorbing clamp away from the interferer until the greatest de­flection is obtained on the indicator of the receiver.

The person who is moving the clamp I'.'ill grip same at the side turned away from the interferer. In case of a permanent installation it is re­commendable to move the cl amp en \\'ooden <]uide rails by the help of a string.

5. On princi.ple, the first :r.aX:dm;m observed on the way from the i.nterferer

ought to be measured. At frequencies exceeding about 150 MC, however, the maximum often occurs in the handle of the interferer. In this case the distance L2 is adjusted to the second maximum, provided that this results in a higher value than the measurement with the absorbing clamp pushed close to the interferer.

6. Read the interference capability on the instrument of the receiver.

6.1 If the receiver is calibrated in dB (pV):

Interference capability

dB (pW)

6.2 If it is calibrated in pv: Interference capability

dB (pW)

reading + correction according to calibration curve

~ (~) ~

20 10glO'U + correction accord­ing to calibration curve

dB

Kindly note: When not in use the eccentric closures should not be locked.

7. Practical directions

7.1 Measurement of an interferer whose interference voltage is unstable or discontinuous.

In this case the mains cable of the interferer must be inductively coupled with an auxiliary interference source of a continuous and constant inter­ference voltage. A battery-operated shaver 5, for example, is suitable for this purpose.

The auxiliary source of interference is installed at a distance of about 15 cm from the mains cable and about 10 cm from the interferer.

After having adjusted the receiver to the frequency to be measured, the distance L2 of the absorbing clamp is set for the maximum interference. For this purpose the mains pl\~ of the interferer has to be removed from

the mains socket.

Switch off the auxiliary source and set the interferer in operation. Carry out the measurement of interference in accordance with Point 6.

7.2 For measurements to serve as a general gUlae where space is limited the interferer's mains cable is pulled through the stationary clamp, and the lengths of the cable on both sides which cannot be straightened are put together to form tangled heaps (this means to say that no coil must be

formed). Using this method the measuring result is between 0 and 3 dB too high depending on the frequency.

If a mains plug connection or a coupling prevents the determination of

the maximum two measurements are carried out: once with the plug close

to the right, then to the left side of the clamp. The interference capa­bility corresponds to the tligher reading increased by 2 dB.

Robert L nth i G m b H Hochrain 40 CH-2502 BIEL Switzerland

o C't co

12 /

5500 4500* ::-

18

1 -~-!-.-;--\ } '~ '~' ::] r:: ----------,----3-----------------------------------

* Additional error if L = 4500 mm

At f = 30 MC - 1 db

above 35 MC 0 db

Device for the measurement MDS - Clamp as specified in

CISPR Publication 16

j_ 50 _I 148 ~

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I

LUthi Elektronik, CH-Nug la4

v/ it h 9 (S)

1 Non-metallic table 2 Guiding track for the MDS-Clamp 3 Tack1 e 4 Socket 5 Connecting cable 6 MDS - C1 amp 7 Cable-clip 8 Object under test 9 Measuring receiver according CISPR

10 * Ferrite absorber of min 500 mm length 11 * or Absorbing Mainfilter KNF 12 Main supply * 10 or 11 is necessary for frequenc i s

lower than 45 Me

//