Kramer Electronics, Ltd.
USER MANUAL
Models:
TR-1,
Video Isolation Transformer
TR-1A,
Audio Isolation Transformer
TR-2A,
Audio Isolation Transformers
TR-3,
Video / Audio Isolation Transformers
Contents
i
Contents
1
Introduction 1
2
Getting Started 1
3
Overview 2
4
Your Isolation Transformers 3
5
Using the Isolation Transformer 7
5.1
Connecting the Isolation Transformer 7
5.2
Setting the dipswitches 9
5.2.1 Audio Dipswitches 10
5.2.2 Video Dipswitches 11
6
Technical Specifications 12
Figures
Figure 1: TR-1 Video Isolation Transformer 3
Figure 2: TR-1A Audio Isolation Transformer 4
Figure 3: TR-2A Audio Isolation Transformers 5
Figure 4: TR-3 Video / Audio Isolation Transformers 6
Figure 5: Connecting the TR-3 Video / Audio Isolation Transformer 8
Figure 6: Dipswitch Settings for TR-3. TR-2A and TR-1A 9
Figure 7: IN and OUT Grounding Options 10
Figure 8: Balanced Audio Grounding Schematics 10
Figure 9: Unbalanced Audio Grounding Schematics 11
Figure 10: Video Grounding Schematics 11
Tables
Table 1: TR-1, TR-1A, TR-2A and TR-3 Characteristics 2
Table 2: Features and Functions of the TR-1 Video Isolation Transformer 3
Table 3: Features and Functions of the TR-1A Audio Isolation Transformer 4
Table 4: Features and Functions of the TR-2A Audio Isolation Transformers 5
Table 5: Features and Functions of the TR-3 Video / Audio Isolation Transformers 6
Table 6: Connecting the TR-1, TR-1A and TR-2A 8
Table 7: Dipswitch Settings 9
Table 8: Audio Dipswitch Settings 10
Table 9: Video Dipswitch Settings 11
Table 10: Technical Specifications of the Isolation Transformers 12
Introduction
1
1 Introduction
Welcome to Kramer Electronics (since 1981): a world of unique, creative and
affordable solutions to the infinite range of problems that confront the video, audio
and presentation professional on a daily basis. In recent years, we have redesigned
and upgraded most of our line, making the best even better! Our 500-plus different
models now appear in 8 Groups1, which are clearly defined by function.
Congratulations on purchasing your Kramer TR-1 Video Isolation
Transformer, TR-1A Audio Isolation Transformer2, TR-2A Audio Isolation
Transformers3 or TR-3 Video / Audio Isolation Transformers3.
This product is ideal for:
Broadcast and production audio/video studios
Audio/video duplication studios
Staging and fieldwork
The package includes the following items:
TR-1 or TR-1A or TR-2A or TR-3
This user manual4
2 Getting Started
We recommend that you:
Unpack the equipment carefully and save the original box and packaging
materials for possible future shipment
Review the contents of this user manual
1 GROUP 1: Distribution Amplifiers; GROUP 2: Video and Audio Switchers, Matrix Switchers and Controllers; GROUP 3:
Video, Audio, VGA/XGA Processors; GROUP 4: Interfaces and Sync Processors; GROUP 5: Twisted Pair Interfaces;
GROUP 6: Accessories and Rack Adapters; GROUP 7: Scan Converters and Scalers; and GROUP 8: Cables and Connectors
2 Mono
3 Stereo
4 Download up-to-date Kramer user manuals from our Web site at http://www.kramerelectronics.com
KRAMER: SIMPLE CREATIVE TECHNOLOGY
Overview
2
3 Overview
In many applications, the connection between video and/or audio sources and
acceptors induces 50Hz or 60Hz ground loops, with an undesirable effect such
as hum bars1 and audio hum.
The Kramer Isolation Transformers break the ground connection in
audio/video transmission lines eliminating the hum caused by ground loops2.
The high-performance Kramer Isolation Transformers are designed for
applications in which interference problems—due to improper grounding and
different ground potentials—affect the quality of the audio/video signal. It can
also be used to remove DC potentials, as well as for removal of common
mode noise (for example, induced on long cable runs). The Isolation
Transformers are purely passive units and are ideal for fieldwork.
The Isolation Transformers:
Include a video bandwidth of 5.8MHz and an audio bandwidth from 20Hz
to 20kHz
Have excellent linearity
Offer total galvanic isolation between input and output
Table 1 describes the unique characteristics of each unit:
Table 1: TR-1, TR-1A, TR-2A and TR-3 Characteristics
Machine Name Isolates and Transforms
TR-1
One video channel
TR-1A
One audio channel (mono)
TR-2A
Two audio channels (stereo)
TR-3
One video channel and two audio channels (Stereo)
To achieve the best performance:
Connect only good quality connection cables, thus avoiding interference,
deterioration in signal quality due to poor matching, and elevated noise
levels (often associated with low quality cables)
Avoid interference from neighboring electrical and magnetic appliances
that may adversely influence signal quality and position your Kramer
Isolation Transformer away from moisture, excessive sunlight and dust
1 May show as a dark or light horizontal bar which slowly scrolls up or down the screen
2 Differences in ground potential
Your Isolation Transformers
3
4 Your Isolation Transformers
This section defines each of the Isolation Transformer units:
Figure 1 and Table 2 define the TR-1 Video Isolation Transformer
Figure 2 and Table 3 define the TR-1A Audio Isolation Transformer
Figure 3 and Table 4 define the TR-2A Audio Isolation Transformers
Figure 4 and Table 5 define the TR-3 Video / Audio Isolation Transformers
Figure 1: TR-1 Video Isolation Transformer
Table 2: Features and Functions of the TR-1 Video Isolation Transformer
# Feature Function
1 VIDEO OUT BNC Connector Connects to the video output
2 VIDEO IN BNC Connector Connects to the video input
3 Ground In the case that you want to connect the unit to an
external ground
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