Kramer Electronics, Ltd.
Contents Contents 1 2 3 4 5 5.1 5.2 Introduction Getting Started Overview Your Isolation Transformers Using the Isolation Transformer Connecting the Isolation Transformer Setting the dipswitches 1 1 2 3 7 7 9 5.2.1 5.2.
Introduction 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.
Overview 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.
Your Isolation Transformers 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 #
Your Isolation Transformers Figure 2: TR-1A Audio Isolation Transformer Table 3: Features and Functions of the TR-1A Audio Isolation Transformer # Feature 1 Ground 2 3 4 AUDIO Terminal Block Connector Dipswitches Function IN OUT In the case that you want to connect the unit to an external ground Connects to the balanced1 audio input Connects to the balanced1 audio output See section 5.
Your Isolation Transformers Figure 3: TR-2A Audio Isolation Transformers Table 4: Features and Functions of the TR-2A Audio Isolation Transformers # 1 2 3 4 5 6 7 Feature Ground IN OUT IN AUDIO LEFT Terminal Block Connector OUT Dipswitches for AUDIO L (Left) Dipswitches for AUDIO R (Right) AUDIO RIGHT Terminal Block Connector Function In the case that you want to connect the unit to an external ground Connects to the right balanced1 audio input Connects to the right balanced1 audio output Connects to the
Your Isolation Transformers Figure 4: TR-3 Video / Audio Isolation Transformers Table 5: Features and Functions of the TR-3 Video / Audio Isolation Transformers # 1 2 3 4 5 6 7 8 9 Feature Ground AUDIO RIGHT Terminal IN Block Connector OUT VIDEO IN BNC Connector VIDEO OUT BNC Connector AUDIO LEFT Terminal IN Block Connector OUT Dipswitches for AUDIO L (Left) Dipswitches for AUDIO R (Right) Function In the case that you want to connect the unit to an external ground 1 Connects to the right balanced audio
Using the Isolation Transformer 5 Using the Isolation Transformer The Isolation Transformers are used for video signals (TR-1); video and balanced1 stereo audio signals (TR-3); balanced1 mono audio signals (TR-1A); and balanced1 stereo audio signals (TR-2A). There are no general rules as to how and where to connect the Isolation Transformers. This depends on many factors, which relate to the setup of the studio, improper grounding and so on.
Using the Isolation Transformer 1 6. Set the dipswitches for optimum performance (see section 5.2). The same principles apply to the TR-1, TR-1A and TR-2A.
Using the Isolation Transformer 5.2 Setting the dipswitches 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 TR-1A TR-2A TR-3 Figure 6 and Table 7 define1 the factory default dipswitches: 1 2 3 4 Figure 6: Dipswitch Settings for TR-3.
Using the Isolation Transformer The grounding conditions are set by trial and error. Check all the options to work out which option best suits your needs1. 5.2.1 Audio Dipswitches The dipswitches let you set the grounding conditions, as illustrated in Figure 7 and defined in Table 8 for the audio channels.
Using the Isolation Transformer + + - - G G Figure 9: Unbalanced Audio Grounding Schematics 5.2.
Technical Specifications 6 Technical Specifications 1 Table 10: Technical Specifications of the Isolation Transformers INPUTS: TR-3: 1 composite video, 1Vpp/75 on a BNC connector, 2 balanced audio +4dBu/600 on detachable terminal blocks; TR-2A: 2 balanced audio +4dBu/600 on detachable terminal blocks; TR-1A: 1 balanced audio +4dBu/600 on a detachable terminal block; TR-1: 1 composite video, 1Vpp/75 on a BNC connector OUTPUTS: TR-3: 1 composite video, 1Vpp/75 on a BNC connector, 2 balanced audio +4dBu/
LIMITED WARRANTY Kramer Electronics (hereafter Kramer) warrants this product free from defects in material and workmanship under the following terms. HOW LONG IS THE WARRANTY Labor and parts are warranted for seven years from the date of the first customer purchase. WHO IS PROTECTED? Only the first purchase customer may enforce this warranty. WHAT IS COVERED AND WHAT IS NOT COVERED Except as below, this warranty covers all defects in material or workmanship in this product.
For the latest information on our products and a list of Kramer distributors, visit our Web site: www.kramerelectronics.com, where updates to this user manual may be found. We welcome your questions, comments and feedback. Kramer Electronics, Ltd. Web site: www.kramerelectronics.com E-mail: info@kramerel.
