User Manual
A100 / A200 / A300
Optical Fibre Probe
Copyright (C) Dipl.- Ing. Gunter Langer
Nöthnitzer Hang 31
01728 Bannewitz
17.01.2000
Voltage measurement and oscillographic signal tracing in devices and
systems under extreme electromagnetic conditions.
A100_200_300_User manual_0816
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LANGER
EMV-Technik
DE-01728 Bannewitz
mail@langer-emv.de
www.langer-emv.com
A100 / A200 / A300
Contents: Page
1 Usage 3
1.1 Measurement under interference conditions 3
1.2 EMC tests as the main field of application 3
1.3 Measured signals 3
1.4 Specific measurement technology 3
1.5 Specific measuring task 3
1.6 Examples of disturbed useful signals 4
2 Function 6
2.1 Method of measurement 6
2.2 AS XXX ADC probe (sensor) 6
2.3 AE XXX DAC receiver 6
3 Operation 7
3.1 Connection of the probe (example AS 100) to the EUT 7
3.2 Starting the AE XXX optical receiver 8
4 Safety instructions 9
5 Warranty 9
6 Technical data 10
6.1 System 10
6.2 Sensors 10
6.3 Receivers 10
7 Scope of delivery 11
7.1 A100-1 / A200-1 / A300-1 (1-channel) set 11
7.2 A100-2 / A200-2 / A300-2 (2-channels) set 12
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LANGER
EMV-Technik
DE-01728 Bannewitz
mail@langer-emv.de
www.langer-emv.com
A100 / A200 / A300
1 Usage
1.1 Measurement under interference conditions
Measurement of analogue electrical signals under extreme electromagnetic stress such as:
- Coupling of radiated or conducted RF emissions
- Fast transients burst / ESD
- High potential (high voltage)
1.2 EMC tests as the main field of application
- Radiated RF emissions EN 61000-4-3:
80 MHz-1 GHz, 80 % AM (1 kHz), anechoic chambers TEM cells stripline,
- Conducted RF emissions EN 61000-4-6:
40 V
- Burst EN 61000-4-4
- ESD EN 61000-4-2
1.3 Measured signals
, 150 kHz-230 MHz, 80 % AM (1 kHz)
eff
- Supply voltages (switching controllers, linear controllers),
- Reference voltages,
- Digital signals (optical couplers, optical receivers),
- Analogue signals (operational amplifiers, ADC, DAC).
1.4 Specific measurement technology
To measure analogue signals under extreme interference conditions, measurement technology is
needed that
a) itself is not affected by disturbance fields and thus does not simulate any disturbance in the
equipment under test (EUT),
b) can be connected to the EUT in a decoupled way, i.e. connecting the probe head does not
result in the development of additional disturbance current paths through which disturbances
can penetrate or be discharged.
The A100 / A200 / A300 optical fibre measurement systems meet these demands.
1.5 Specific measuring task
Analogue electronic modules are generally influenced in EMC tests when RF, modulated by 1 kHz,
is applied to the EUT. This influence is due to the fact that the infiltrated RF disturbance is demodulated at PN junctions of the electronic circuit. This generates signal level fluctuations or 1 kHz
disturbance signals. The 1 kHz disturbance signal is produced through modulation of the RF
disturbance by 1 kHz.
Relatively slow disturbance signals with a fundamental wave of 1 kHz, which mostly interfere with
analogue circuits, are characteristic for RF disturbance coupling.
Figure 1 to Figure 6 on the following pages shows examples of useful signals that were subjected
to disturbances. The deviation of the signal form from the sine wave varies, i.e. the disturbance
signal also contains a harmonic component as well as the fundamental one. The task is to correctly
measure these relatively slow disturbance signals under extreme RF interference conditions.
The A100 / A200 / A300 measurement systems are ideal for these conditions because of their high
disturbance immunity.
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A100 / A200 / A300
Figure 1 The oscillogram shows a constant useful
signal with a demodulated 1 kHz component.
Figure 2 The demodulated 1 kHz disturbance signal,
superimposed on the useful signal, shows a large
harmonic component.
Figure 3 The demodulated 1 kHz disturbance signal
is limited by the lower rail.
1.6 Examples of disturbed useful signals
- Signals were measured with the AS 100 optical fibre probe
- Radiated RF emissions: 250 MHz, 80 % amplitude-modulated by 1 kHz
- EUT: operational amplifier circuit; RF coupling via an operational amplifier input; the disturbance
signal was measured on the output.
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EMV-Technik
DE-01728 Bannewitz
mail@langer-emv.de
www.langer-emv.com
A100 / A200 / A300
Figure 4 Useful signal without interference
Figure 5 Useful signal with 1 kHz disturbance signal
Figure 6 Useful signal with 1 kHz disturbance signal
limited by the upper rail
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EMV-Technik
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mail@langer-emv.de
www.langer-emv.com
A100 / A200 / A300
Figure 7 Optical fibre measuring system
Optical fibre probe (sensor)
Control range
AS 100
50 / 10 VDC
AS 110
10 / 1 VDC
AS 120
1 / 0.1 VAC
AS 200
50 / 10 VDC
AS 300
±10 VDC
2 Function
2.1 Method of measurement
An RF-immune probe (AS XXX optical fibre probe), of which the A/D (analogue-to-digital) converter
is an integral part, is autonomously operated in the EUT without interfering with the EUT's EMC
conditions.
The only connection between the AS XXX probe and the EUT is an optical fibre that sends the
measured values, which are continuously generated by the ADC as a serial data flow, to an optical
receiver.
A D/A (digital-to-analogue) converter (DAC) converts the digital sampling values back into an
analogue signal that can be evaluated by an oscilloscope.
2.2 AS XXX ADC probe (sensor)
The voltage that is applied to input E (Measuring input Figure 8) of the AS XXX probe (sensor) is
converted to a serial data flow by an A/D converter.
The variable voltage divider generates the following control ranges:
In the AS 120 optical fibre probe a capacitive coupled amplifier is integrated with a low cut-off
frequency of about 300 Hz.
The sensor is protected against polarity reversal.
2.3 AE XXX DAC receiver
An optical receiver converts the optical fibre signal to a serial data signal. A sequential logic system
synchronizes the receiver and controls the serial-parallel conversion of the measured values and
the D/A conversion. Operational amplifiers are connected to the DAC output to filter and adjust the
control ranges.
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LANGER
EMV-Technik
DE-01728 Bannewitz
mail@langer-emv.de
www.langer-emv.com
A100 / A200 / A300
Figure 8 AS 100 pin assignment
3 Operation
3.1 Connection of the probe (example AS 100) to the EUT
Attention: Only connect and disconnect an AS XXX sensor when it is not subjected to any
interference.
The connector between the optical fibre probe and the EUT has to be extremely short to ensure
satisfactory measurements of burst and ESD under radiated RF interference conditions. Common
prods and clips are too big.
The optical fibre probe has to be connected to the circuit board or IC via a socket to ensure the
requisite small-scale set-up. Because the socket, rather than the probe itself, is soldered to the
pins or lines, the measuring point can be quickly changed by plugging the probe into other sockets.
- To ensure the socket doesn’t move, glue it to the circuit board or IC of the EUT. Connect the
socket to the EUT via a CuL wire according to the sensor's pin assignment.
- Power is supplied via the EUT or a battery.
To avoid measuring errors pay attention:
- To position the AS XXX close to the EUT's GND areas.
- To solder the socket directly to the line to be measured with short connecting wires (10...20 mm).
- That the power is supplied by immediate signal environment via the pins or block capacitor of the
relevant IC.
- To connect the GND of the socket and the GND of the module via a short connector (10...20 mm)
when power is supplied by a battery. Position a block capacitor (approx. 100 nF) at the connecting point.
Basic rule: The closer the sensor (with its housing and GND connection) is positioned to the GND
system of the EUT, the higher its disturbance immunity will be and the fewer disturbances will
occur.
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A100 / A200 / A300
Figure 9 AS 100 connected to the EUT; position the AS 100 on the IC package if there isn't enough free space above
GND
Figure 10 AE 300 connectors and displays
3.2 Starting the AE XXX optical receiver
- Connect the AE XXX to the oscilloscope (BNC plug).
- The receiver output supplies a zero-delay voltage of 10 V independent of the measuring range
that is selected on the AS XXX. Thus, the vertical deflection on the oscilloscope should be
0.5-2 V/div.
- Connect the power supply to AE XXX (plug-in power supply unit) lower LED "ON“ must be on.
Connect Sensor and receiver with the optical fibre upper LED "Sync“ must be on. Loose the
clamped joint on the receiver, insert the optical fibre completely and slightly fasten the loose joint.
- The oscilloscope must show an output voltage and/or signal form that corresponds to that applied
to the sensor input.
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LANGER
EMV-Technik
DE-01728 Bannewitz
mail@langer-emv.de
www.langer-emv.com
A100 / A200 / A300
4 Safety instructions
When using a product from Langer EMV-Technik GmbH, please observe the following safety
instructions to protect yourself from electric shock or the risk of injuries.
Read and follow the instructions in the user manual and keep it in a safe place for later reference. The
device may only be used by personnel who are qualified in the field of EMC and who are fit to work with
and possibly be influenced by disturbance voltages and (electric and magnetic) burst fields.
Read the operating and safety instructions for all devices used in the set-up.
Never use any damaged or defective devices.
Carry out a visual check before using a measurement set-up with a Langer EMV-Technik GmbH
product. Replace any damaged connecting cables before using the product.
Never leave a product from Langer EMV-Technik GmbH unattended whilst it is in operation.
The Langer EMV-Technik GmbH product may only be used for its intended purpose. Any other
use is forbidden.
People with a pacemaker are not allowed to work with this device.
The test set-up should always be operated via a filtered power supply.
Attention! Functional near fields and interference emissions may occur when the probe is
operated. The user is responsible for taking appropriate precautions to prevent any interference with the correct function of products outside the operational EMC environment (in
particular through interference emissions. This can be achieved by:
- observing an appropriate safety distance
- using of shielded or shielding rooms
The disturbances that are injected into the modules can destroy the device under test (latch-up) if
their intensity is too high. Protect the device under test by:
- increasing the disturbance gradually and stopping when a functional fault occurs
- interrupting the power supply to the device under test in the event of a latch-up.
Attention! Make sure that internal functional faults are visible from outside. The device
under test may be destroyed due to an increase in the injection intensity if the faults are not
visible from outside. Take the following precautions if necessary:
monitor the representative signals in the device under test
use a special test software
monitor visible reaction of the device under test to inputs (reaction test of the device under test).
We cannot assume any liability for the destruction of devices under test!
5 Warranty
Langer EMV-Technik GmbH will remedy any fault due to defective material or defective manufacture, either by repair or by delivery of spare parts, during the statutory warranty period.
This warranty is only granted on condition that:
- the information and instructions in the user manual have been followed.
The warranty will be forfeited if:
- an unauthorized repair is performed on the product,
- the product is modified,
- the product is not used for its intended purpose.
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LANGER
EMV-Technik
DE-01728 Bannewitz
mail@langer-emv.de
www.langer-emv.com
A100 / A200 / A300
System
A100
A200
A300
Resolution
12 Bit
12 Bit
10 Bit
Conversion rate
125 ksps
3 Msps
12.5 Msps
Bandwidth
25 kHz
500 kHz
5 MHz
Transfer rate (optical fibre)
4 Mbps
48 Mbps
150 Mbps
Operating range (optical fibre)
1 – 20 m *
Sensor type
AS 100
AS 110
AS 120
AS 200
AS 300
Measuring range,
switchable
50 V / 10 VDC
10 V / 1 VDC
1 V / 0.1 VAC
300 Hz – 25 kHz
50 V /
10 VDC
±10 VDC
Input resistance
100 k
1 M
1 M
100 k
100 k
Radiated immunity*
>200 V/m
>100 V/m
>100 V/m
>100 V/m
200 V/m
Current consumption
ca. 3 mA
ca. 30 mA
70 – 30 mA
Operating voltage
3 - 16 V
4.5 - 16 V
Dimensions
(34 x 10 x 7) mm
Operating
temperature range
0 – 70 °C
Receiver type
AE 100
AE 200
AE 300
Current consumption
ca. 30 mA
ca. 100 mA
90 mA
Operating voltage
12 - 16 V
12 V
Output voltage
0 - 10 V
±1 V
Dimensions
(71 x 47 x 14) mm
Operating
temperature range
0 – 70°C
6 Technical data
6.1 System
* The device is delivered with an optical fibre of 1.5 m – 1 channel or 6 m – 2 channels
Please order other dimensions separately.
6.2 Sensors
* Connectors 20 mm, on GND area, disturbances at output < 50 mV
6.3 Receivers
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LANGER
EMV-Technik
DE-01728 Bannewitz
mail@langer-emv.de
www.langer-emv.com
A100 / A200 / A300
Figure 11 Case AXXX 1-channel set
7 Scope of delivery
7.1 A100-1 / A200-1 / A300-1 (1-channel) set
Pos. Designation Type Quantity
01 Optical receiver (DAC) AE 100 / 200 / 300 1
02 Optical fibre probe (ADC), of choice * AS XXX 1
03 Power supply unit NT FRI EU / NT FRI US 1
04 Optical fibre LWL Ø 2.2 mm, 1.5 m 1
05 Adapter socket 3-poles 3
06 Enamelled Copper Wire Wire CuL 1
07 System case AXXX-1 case 1
08 Quick guide Analog qg 1
09 User manual Analog m 1
* Further sensors are available on request and can be added to the set.
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LANGER
EMV-Technik
DE-01728 Bannewitz
mail@langer-emv.de
www.langer-emv.com
A100 / A200 / A300
Figure 12 Case AXXX 2-channels set
This document may not be copied, reproduced or electronically processed, either in its entirety or in part, without the
prior written permission of Langer EMV-Technik GmbH. The management of Langer EMV-Technik GmbH assumes no
liability for damage that may arise from using this printed information.
Langer EMV-Technik-GmbH
Noethnitzer Hang 31
Tel.: +49(0)351/430093-0
DE-01728 Bannewitz
Fax: +49(0)351/430093-22
www.langer-emv.com
mail@langer-emv.de
7.2 A100-2 / A200-2 / A300-2 (2-channels) set
Pos. Designation Type Quantity
01 Optical receiver (DAC) AE 100 / 200 / 300 2
02 Optical fibre probe (ADC), of choice* AS XXX 2
03 Power supply unit NT FRI EU / NT FRI US 1
04 Power split cable 20 cm 1
05 Optical fibre LWL Ø 2.2 mm 6 m 2
06 Adapter socket 3-poles 6
07 Enamelled Copper Wire Wire CuL 1
08 System case AXXX-2 case 1
09 Quick guide Analog qg 1
10 User manual Analog m 1
* Further sensors are available on request and can be added to the set.
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