Omicron Lab B-WIT 100 User manual

Injection Transformer
User Manual
B-WIT 100
Wideband Injection Transformer
B-LFT 100
Low Frequency Injection Transformer
Safety instructions Sicherheitshinweise
Указания за безопасност Bezpečnostní pokyny
Sikkerhedsanvisninger Οδηγίες ασφαλείας
Instrucciones de seguridad Ohutusjuhised
Turvallisuusohjeet Consignes de sécurité
Sigurnosne upute Biztonsági utasítások
Istruzioni di sicurezza Saugos nurodymai
Drošības instrukcijas Veiligheidsinstructies
Instrukcje bezpieczeństwa Instruções de segurança
Instrucțiuni de siguranță Bezpečnostné pokyny
Varnostna navodila Säkerhetsinstruktioner
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2 OMICRON Lab
Injection Transformer User Manual
Version: ENU 1189 05 04 —Year: 2018
© OMICRON Lab, OMICRON electronics. All rights reserved.
This manual is a publication of OMICRON electronics.
All rights including translation reserved. Reproduction of any kind, e.g., photocopying, microfilming,
optical character recognition and/or storage in electronic data processing systems, requires the explicit
consent of OMICRON electronics. Reprinting, wholly or in part, is not permitted.
The product information, specifications, and technical data embodied in this manual represent the
technical status at the time of writing and are subject to change without prior notice.
Windows is a registered trademark of Microsoft Corporation. OMICRON Lab and Smart Measurement
Solutions are registered trademarks of OMICRON electronics.

OMICRON Lab 3
Safety Instructions
Safety Instructions
Safety instructions, designated use and operator qualifications.............................................................. 16
Sicherheitshinweise, bestimmungsgemäße Verwendung und Qualifikation des Bedienpersonals ........ 16
Указания за безопасност, предназначение и квалификации на оператора ..................................... 16
Bezpečnostní pokyny, určené použití a kvalifikace operátora................................................................. 17
Sikkerhedsanvisninger, tilsigtet brug og operatørkvalifikationer.............................................................. 17
Οδηγίες ασφαλείας, προβλεπόμενη χρήση και προσόντα χειριστών...................................................... 17
Instrucciones de seguridad, aplicación prevista y cualificaciones de los operadores............................. 18
Ohutusjuhised, kasutusotstarve ja kasutaja kvalifikatsioon..................................................................... 18
Turvallisuusohjeet, käyttötarkoitus ja käyttäjän pätevyys........................................................................ 18
Consignes de sécurité, utilisation prévue et qualifications des opérateurs ............................................. 19
Sigurnosne upute, predviđena namjena i kvalifikacije rukovatelja .......................................................... 19
Biztonsági utasítások, rendeltetésszerű használat és kezelői szakképesítési követelmények............... 19
Istruzioni di sicurezza, utilizzo previsto e qualifiche degli operatori......................................................... 20
Saugos nurodymai, numatytasis naudojimas ir operatoriaus kvalifikacijos............................................. 20
Drošības instrukcijas, paredzētā izmantošana un operatora kvalifikācija ............................................... 20
Veiligheidsinstructies, beoogd gebruik en kwalificaties van de bediener ................................................ 21
Instrukcje bezpieczeństwa, przeznaczenie i kwalifikacje operatora ........................................................ 21
Instruções de segurança, uso designado e qualificações do operador................................................... 21
Instrucțiuni de siguranță, destinația de utilizare și calificările operatorului .............................................. 22
Bezpečnostné pokyny, určené použitie a kvalifikácia obsluhy ................................................................ 22
Varnostna navodila, predvidena uporaba in kvalifikacije upravljavca...................................................... 22
Säkerhetsinstruktioner, avsedd användning och användarkvalifikationer............................................... 23
EN
DE
BG
CS
DA
EL
ES
ET
FI
FR
HR
HU
IT
LT
LV
NL
PL
PT
RO
SK
SL
SV

4 OMICRON Lab
Injection Transformer User Manual
1 Compliance statements and recycling
1.1 Declaration of conformity (EU)
The B-WIT 100 or B-LFT 100 adhere to the guidelines of the council of the European Community for
meeting the requirements of the member states regarding the low voltage directive (LVD), the
electromagnetic compatibility (EMC) directive and the RoHS directive.
1.2 Information for disposal and recycling
This test set (including all accessories) is not intended for household use. After use the
test set cannot be disposed of as household waste!
For customers in EU countries (incl. European Economic Area):
OMICRON test sets are subject to the EU Waste Electrical and Electronic Equipment
Directive (WEEE directive). As part of our legal obligations under this legislation,
OMICRON offers to take back the OMICRON test set and ensure that it is disposed of by
an authorized recycling facility.
For customers outside the European Economic Area:
Please contact the competent authorities for the relevant environmental regulations in your
country and dispose the OMICRON test set only in accordance with your local legal
requirements.

OMICRON Lab 5
Safety
2 Safety
2.1 Disclaimer
If the equipment is used in a manner not specified by the manufacturer, the protection provided by the
equipment may be impaired. Opening the B-WIT 100 or B-LFT 100 invalidates all warranty claims.
2.2 Designated use
B-WIT 100 and B-LFT 100 have been especially designed for the injection of signals into control loops
in combination with a frequency response analyzer like Bode 100.
B-WIT 100 and B-LFT 100 have been especially designed for the use in laboratory and manufacturing
environments.
Safety symbols used
In this manual, the following symbol indicates safety instructions for avoiding hazards.
WARNING
Death or serve injury can occur if the appropriate safety instructions are not observed.
CAUTION
Minor or moderate injury may occur if the appropriate safety instructions are not
observed.
NOTICE
Equipment damage or loss of data possible.

6 OMICRON Lab
Injection Transformer User Manual
2.3 Safety instructions
Before operating the B-WIT 100 or B-LFT 100, read the safety instructions in this document carefully. If
you do not understand some safety rules, contact OMICRON Lab before proceeding.
Before operating always make sure that neither the B-WIT 100 or B-LFT 100 nor its accessories are
damaged.
Test setups that include the B-WIT 100 or B-LFT 100 must comply with the internal safety instructions
and all additionalsafety relevant documents.
In addition, observe the following safety standards, if applicable:
• EN 50191 (VDE 0104) "Erection and Operation of Electrical Test Equipment"
For your safety
The B-WIT 100 or B-LFT 100 may only be operated by trained personnel. Any maloperation can result in
damage to property or persons.
Rules for use
►The B-WIT 100 or B-LFT 100 must only be used when in a technically sound condition. The use
must be in accordance with the safety regulations for the specific job site and application.
►Always be aware of the dangers of high voltages. Pay attention to the information provided in the
documentation.
►Testing with the B-WIT 100 or B-LFT 100 shall only be carried out by authorized and qualified
personnel. Before starting to work, clearly establish the responsibilities of all personnel involved.
►Testing with the B-WIT 100 or B-LFT 100 must comply with all on-site procedures and methods for
personal safety.
►Personnel receiving training, instructions, directions or education on the B-WIT 100 or B-LFT 100
must be under constant supervision of an experienced operator while working with the equipment
on voltage levels >30 VAC or >60 VDC.
►Keep this manual available on site where the B-WIT 100 or B-LFT 100 is used.
►The B-WIT 100 or B-LFT 100 does not contain any serviceable parts. Do not open the B-WIT 100 or
B-LFT 100 or carry out any modifications, extensions or adaptations.
►If the B-WIT 100 or B-LFT 100 seems to be functioning improperly, please contact the
OMICRON Lab technical support (see Technical support on page 15).
Safe operation procedures
►Operate the B-WIT 100 or B-LFT 100 only under the environmental conditions specified in chapter
Technical data on page 11ff.
►Do not operate the B-WIT 100 or B-LFT 100 when explosive gas or vapours are present.
2.4 Cleaning
To clean the B-WIT 100 or B-LFT 100, use a cloth dampened with isopropanol alcohol. Prior to cleaning,
always ensure that all connections to the DUT are disconnected.

OMICRON Lab 7
Device Overview
3 Device Overview
3.1 B-WIT 100 Wideband Injection Transformer
Delivery includes:
Injection transformer
BNC to 4 mm banana adapter
Figure 3-1: B-WIT 100 connector description
INPUT connector
BNC plug to connect the B-WIT 100
injection transformer to the signal source
EARTH TERMINAL to connect
device to safety ground
ISOLATED OUTPUT connectors
4 mm safety banana jacks for connecting the
injection transformer to the injection resistor

8 OMICRON Lab
Injection Transformer User Manual
3.2 B-LFT 100 Low Frequency Injection Transformer
Delivery includes:
Injection transformer
BNC to 4 mm banana adapter
Figure 3-2: B-LFT 100 connector description
INPUT connector
BNC plug to connect the B-LFT 100
injection transformer to the signal source
EARTH TERMINAL
to connect device to
safety ground
ISOLATED OUTPUT connectors
4 mm safety banana jacks for connecting the
injection transformer to the injection resistor

OMICRON Lab 9
Typical measurement setup
4 Typical measurement setup
The B-WIT 100 or B-LFT 100 isolate the ground referenced signal source of a VNA such that the AC
signal can be injected into a DC feedback loop across an injection resistor. This method is generally
known as “voltage injection”.
Figure 4-1 shows a typical loop gain measurement setup using an injection transformer and a VNA. The
system under test is generally a negative feedback system such as a switching power converter or a
linear voltage regulator. The feedback is often lowered using a voltage divider. To measure the loop
gain, an additional injection resistor Ri is inserted to the loop as shown in the figure below.
The input of the injection transformer is connected to the output of the vector network analyzer. The
output of the injection transformer is connected across the injection resistor Ri. This allows to
differentially inject a disturbance voltage to the feedback loop without disturbing the DC operating point.
Two safety isolation probes are used to pick up the voltage signal on either side of the injection resistor.
B-WIT 100 is designed for use with injection resistors between 1 Ω and 10 Ω (10 Ω recommended).
B-LFT 100 is designed for use with an injection resistor of 1 kΩ.
Figure 4-1: Typical measurement setup
More details and information about the loop gain measurement can be found in our application note
section at: https://www.omicron-lab.com/

10 OMICRON Lab
Injection Transformer User Manual
WARNING
Death or serve injury due to hazardous voltage levels.
Use proper safety probes and make sure that the injection transformer and safety
probes are connected to safety ground using a proper ground connection when
working on voltage levels >30 VAC or >60 VDC
CAUTION
Minor or moderate injury in case of equipment failure.
Always connect the injection transformer’s earth terminal to safety ground using a
proper ground connection when voltage levels >30 VAC or >60 VDC are present in the
setup.
NOTICE
Do not apply DC signals to the output of the injection transformer.
Otherwise the injection transformer will be damaged!
- B-WIT 100 contains a 1 A fuse (not replaceable by user)
- B-LFT 100 contains a 100 mA fuse (not replaceable by user)