OC-4 - Audio/Video Equipment Kramer - Free user manual and instructions

Product Type	Quad Channel Video Isolator
Brand	Kramer
Model	OC-4
Number of Channels	4
Input Connectors	4 BNC (composite video, 1 Vpp/75 Ω)
Output Connectors	4 BNC (composite video, 1 Vpp/75 Ω)
Bandwidth (-3 dB)	20 MHz
Signal-to-Noise Ratio	69 dB
Isolation Method	Opto-isolator circuit
Controls per Channel	AMP (level), HF (equalization), GAIN (output), ground lift buttons (input/output)
Power Indicator	Illuminated power switch
Power Supply	230 V AC, 50/60 Hz (115 V AC, USA)
Power Consumption	2.3 VA
Dimensions (W x D x H)	48.3 cm x 17.8 cm x 4.4 cm (19" x 7" x 1U)
Weight	3.5 kg (7.8 lbs) approx.
Rack Mountable	Yes, 1U with included rack ears (optional RK-1 adapter)
Accessories Included	Power cord, user manual
Maintenance & Cleaning	Wipe with dry cloth; do not use liquids or solvents.
Safety Warnings	Disconnect power before opening or servicing. Use only supplied power supply.
Repair & Service	Only by authorized Kramer technicians. Contact dealer for service.
Warranty	7 years for parts and labor from first customer purchase.
Application	Eliminates video hum, ground loops, and DC offsets in multi-circuit setups.

Frequently Asked Questions - OC-4 Kramer

What is the main purpose of the Kramer OC-4?

The OC-4 is a quad-channel video isolator that eliminates hum bars, ground loops, and DC offsets by providing complete electrical isolation between video sources and displays.

How many video signals can the OC-4 handle?

The OC-4 can handle up to four composite video signals simultaneously, each with its own input and output BNC connector.

How do I connect the OC-4?

Connect video sources to the INPUT BNC connectors (channels 1-4) and video acceptors (displays, projectors) to the OUTPUT BNC connectors. Then connect the power cord. Adjust AMP, HF, and GAIN trimmers as needed and use the ground buttons to float input or output grounds.

What do the ground buttons do?

The ground buttons allow you to 'float' the ground on either the input or output side. This helps break ground loops that cause hum. Release the button to float that side.

Can I adjust the video signal level?

Yes. Each channel has AMP (input level), HF (cable equalization/peaking), and GAIN (output level) trimmers. Use a small screwdriver to adjust.

Is the OC-4 rack-mountable?

Yes, it is designed to fit a standard 19-inch rack and occupies 1U of space. An optional RK-1 rack adapter is available.

What type of cables should I use?

Use high-quality coaxial cables with BNC connectors. Kramer recommends their high-resolution cables for best performance.

What is the bandwidth and S/N ratio?

The bandwidth is 20 MHz (-3 dB) and the signal-to-noise ratio is 69 dB, ensuring good video quality.

How do I clean the OC-4?

Clean the exterior with a soft, dry cloth. Do not use any liquids, sprays, or abrasive cleaners.

What is the warranty period?

Kramer provides a 7-year warranty on parts and labor from the date of first customer purchase. Contact an authorized dealer for service.

USER MANUAL OC-4 Kramer

Kramer Electronics, Ltd.

USER MANUAL

Models:

OC-1N, Video Isolator

OC-2, Dual Channel Video Isolator

OC-4, Quad Channel Video Isolator

Contents

1 Introduction 1

2 Getting Started 1

2.1 Quick Start 1

3 Overview 3

4 Your Video Isolators 4

4.1 The OC-1N Video Isolator 4

4.2 The OC-2 Dual Channel Video Isolator 5

4.3 The OC-4 Quad Channel Video Isolator 5

5 Connecting the Video Isolator 7

5.1 Connecting the OC-1N Video Isolator 8

5.2 Connecting the OC-2 Dual Channel Video Isolator 9

5.3 Connecting the OC-4 Quad Channel Video Isolator 10

6 Technical Specifications 12

Figures

Figure 1: OC-1N Video Isolator 4

Figure 2: OC-2 Dual Channel Video Isolator 5

Figure 3: OC-4 Quad Channel Video Isolator 6

Figure 4: Connecting the OC-1N Video Isolator 8

Figure 5: Connecting the OC-2 Dual Channel Video Isolator 9

Figure 6: Connecting the OC-4 Quad Channel Video Isolator 11

Tables

Table 1: OC-1N Video Isolator Features 4

Table 2: OC-2 Dual Channel Video Isolator Features 5

Table 3: OC-4 Quad Channel Video Isolator Features 7

Table 4: Technical Specifications of the OC-1N Video Isolator 12

Table 5: Technical Specifications of the OC-2 Dual Channel Video Isolator 12

Table 6: Technical Specifications of the OC-4 Quad Channel Video Isolator 12

1 Introduction

Welcome to Kramer Electronics! Since 1981, Kramer Electronics has been providing a world of unique, creative, and affordable solutions to the vast range of problems that confront the video, audio, presentation, and broadcasting professional on a daily basis. In recent years, we have redesigned and upgraded most of our line, making the best even better! Our 1,000-plus different models now appear in 11 groups ^1 that are clearly defined by function.

Congratulations on purchasing your Kramer OC-1N Video Isolator and/or OC-2 Dual Channel Video Isolator and/or OC-4 Quad Channel Video Isolator.

This product is ideal for:

• Large display systems with sources and displays/projectors on different power circuits
  • Video field production sessions
  • Hospital and other critical applications requiring complete isolation
• Eliminating video hum bars and noise

The package includes the following items:

• OC-1N Video Isolator and/or OC-2 Dual Channel Video Isolator and/or OC-4 Quad Channel Video Isolator
• Power connector
• This user manual ^2

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
• Use Kramer high performance high resolution cables ^3

2.1 Quick Start

This quick start chart summarizes the basic setup and operation steps.

graph TD
    A["Step 1: Connect the inputs and the outputs"] --> B["Connect the input."]
    B --> C["IN AMP"]
    C --> D["HF GAIN OUT"]
    D --> E["OC-1N"]
    E --> F["Connect the output."]

    G["Step 2: Connect the power"] --> H["INPUT IN OUT HF GAIN OUTPUT"]
    H --> I["OC-2 (two channels) and OC-4 (four channels)"]
    I --> J["Connect the output."]

    K["Step 3: Set the unit"] --> L["Adjust the AMP, HF and GAIN."]
    L --> M["IN AMP"]
    M --> N["HF GAIN OUT"]
    N --> O["OC-1N"]
    O --> P["Press/release the ground buttons."]

    Q["Step 4: Connect the input."] --> R["Connect the input."]
    R --> S["CHANNEL 1"]
    S --> T["Output"]
    T --> U["OC-2 (two channels) and OC-4 (four channels)"]
    U --> V["Connect the output."]
    V --> W["Connect the output."]

    X["Step 5: Connect the power"] --> Y["Adjust the ground buttons."]
    Y --> Z["CHANNEL 1"]
    Z --> AA["Output"]
    AA --> AB["OC-2 (two channels) and OC-4 (four channels)"]
    AB --> AC["Connect the output."]
    AC --> AD["Connect the output."]

3 Overview

The Kramer OC-1N, OC-2 and OC-4 are high quality video isolator units for one, two and four video or sync signals, respectively. They provide complete isolation between devices thus eliminating video hum, ground loops, and DC offsets which can degrade picture quality. The video isolators let the user select which GROUND becomes floating - input, output, both or none, using the rear panel buttons.

In addition, the Video Isolator:

• Has a bandwidth of 20MHz (-3dB)
• Features Opto-Isolator Circuitry providing an extremely linear response and wide frequency range compared to traditional transformer based units
• Includes Level (Gain) and EQ (Peaking) Controls per channel

Achieving the best performance means:

• Connecting 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)
• Avoiding interference from neighboring electrical appliances and positioning your Video Isolatoraway from moisture, excessive sunlight and dust

4 Your Video Isolators

This section defines the OC-1N (see section 4.1), the OC-2 (see section 4.2) and the OC-4 (see section 4.3).

4.1 The OC-1N Video Isolator

Figure 1 and Table 1 define the OC-1N:

Figure 1: OC-1N Video Isolator

Table 1: OC-1N Video Isolator Features

# Feature Function
1 POWER Switch Illuminated switch for turning the unit ON or OFF
2 BNC Connector Connect to the video source
3 AMP Trimmer Adjust ^1 the video input signal level
4	Ground Button Release to "float" the input signal
5 GoadT Button Release to "float" the output signal
6 HF Trimmer Adjust ^1 cable equalization level
7 GAIN Trimmer Adjust ^1 the video output gain
8	BNC Connector Connect to the video acceptor
9 Power Connector with Fuse AC connector enabling power supply to the unit

4.2 The OC-2 Dual Channel Video Isolator

Figure 2 and Table 2 define the OC-2:

Figure 2: OC-2 Dual Channel Video Isolator

Table 2: OC-2 Dual Channel Video Isolator Features

# Feature Function
1 POWER Switch Illuminated switch for turning the unit ON or OFF
2 INPCORBNEConnector Connect to the video source
3 INCHANNEL2 Ground Button Release to "float" the input signal
4 OUT Ground Button	Release to "float" the output signal
5 HF Trimmer Adjust		^1 the cable equalization level
6 GAIN Trimmer Adjust	just	^1 the video output gain
7
	OUTPUT BNC Connector Connect to the video acceptor
8 Power Connector with Fuse AC connector enabling power supply to the unit

4.3 The OC-4 Quad Channel Video Isolator

Figure 3 illustrates the OC-4 and Table 3 defines the front and rear panels.

Your Video Isolators

Figure 3: OC-4 Quad Channel Video Isolator

Table 3: OC-4 Quad Channel Video Isolator Features

#	Feature Function
1	PC	WER Switch Illuminated switch for turning the unit ON or OFF
2	INPUT CHANNEL 2	Connector Connect to the video source
3	IN Ground Button, CHANNEL 3	Release to "float" the input signal
4	OUT Ground Button CHANNEL 4	Release to "float" the output signal
5	HF Trimmer Adjust		^1 the cable equalization level
6	GAIN Trimmer Adjust	Adjust	^1 the video output gain
7		OUTPUT BNC Connector Connect to the video acceptor
8	Power Connector with Fuse AC connector enabling power supply to the unit

5 Connecting the Video Isolator

This section describes how to connect the:

• OC-1N, see section 5.1
• OC-2, see section 5.2
• OC-4, see section 5.3

5.1 Connecting the OC-1N Video Isolator

To connect the OC-1N, as illustrated in the example in Figure 4, do the following ^1 :

1. Connect a video source (for example, a camcorder) to the IN BNC connector.
2. Connect the OUT BNC connector to a video acceptor (for example, a display).
3. Connect the power.
4. If required:

- Adjust ^2 the video input AMP level and/or the video output, GAIN and HF levels

■ Press or release the ground input and/or output GND buttons

Figure 4: Connecting the OC-1N Video Isolator

5.2 Connecting the OC-2 Dual Channel Video Isolator

To connect the OC-2, as illustrated in the example in Figure 5, do the following ^1 :

1. Connect up to two video sources:

2. A video source (for example, a video player) to the CHANNEL 1 INPUT BNC connector

3. A video source (for example, a camcorder) to the CHANNEL 2 INPUT BNC connector

4. Connect up to two video acceptors:

■ The CHANNEL 1 OUTPUT BNC connector to a video acceptor (for example, a display)
■ The CHANNEL 2 OUTPUT BNC connector to a video acceptor (for example, a projector)

1. Connect the power.

2. If required:

3. Adjust ^2 the video input and/or output GAIN and HF levels
   ■ Press or release the ground input and/or output GND buttons

graph TD
    A["Video Player"] -->|CV| B["Output"]
    C["Display"] -->|A2| B
    D["Camcorder"] -->|CV| B
    E["Projector"] -->|CV| B
    B --> F["Channel 1"]
    B --> G["Channel 2"]
    B --> H["Output"]
    style A fill:#f9f,stroke:#333
    style C fill:#ccf,stroke:#333
    style D fill:#cfc,stroke:#333
    style E fill:#fcc,stroke:#333

Figure 5: Connecting the OC-2 Dual Channel Video Isolator

5.3 Connecting the OC-4 Quad Channel Video Isolator

To connect ^1 the OC-4, as illustrated in the example in Figure 6, do the following ^2 :

1. Connect up to four video sources:

2. A video source (for example, a camcorder) to the CHANNEL 1 INPUT BNC connector

3. A video source (for example, a camcorder) to the CHANNEL 4 INPUT BNC connector

4. Connect up to four video acceptors:

5. The CHANNEL 1 OUTPUT BNC connector to a video acceptor (for example, a display)
   ■ The CHANNEL 4 OUTPUT BNC connector to a video acceptor (for example, a projector)

6. Connect the power.

7. If required:

8. Adjust ^3 the video input and/or output GAIN and HF levels

9. Press or release the ground input and/or output GND buttons

graph TD
    A["Server"] -->|NV| B["Display 1"]
    A -->|CV| C["Display 4"]
    B --> D["Camcorder 1"]
    B --> E["Camcorder 4"]
    C --> F["Camcorder 4"]

Figure 6: Connecting the OC-4 Quad Channel Video Isolator

6 Technical Specifications

Table 4 includes the technical specifications of the OC-1N, OC-2 and OC-4:
Table 4: Technical Specifications ^1 of the OC-1N Video Isolator

INPUT: 1 composite video, 1Vpp/75Ω on a BNC connector
OUTPUT: 1 composite video, 1Vpp/75Ω on a BNC connector
S/N RATIO: 69dB
BANDWIDTH(-3dB): 20MHz
POWER SOURCE: 230V	AC, 50/60Hz, (115V AC, U.S.A.) 2.3VA
DIMENSIONS: 16.5cm x	12cm x 4.5cm (6.5" x 4.7" x 1.8") W, D, H
WEIGHT: 0.72kg (1.6lbs)	approx.
ACCESSORIES: Power cord
OPTIONS: RK-1 19" rack	adapter

Table 5: Technical Specifications ^1 of the OC-2 Dual Channel Video Isolator

INPUT: 2 composite video, 1Vpp/75Ω on BNC connectors
OUTPUT: 2 composite video, 1Vpp/75Ω on BNC connectors
BANDWIDTH (-3dB): 20MHz
S/N RATIO: 69dB
POWER SOURCE: 230V	AC, 50/60Hz, (115V AC, U.S.A.) 2.3VA
DIMENSIONS: 22cm x 18	cm x 4.5cm (8.7" x 7" x 1.7") W, D, H
WEIGHT: 1.3kg (2.9lbs) approx.
ACCESSORIES: Power cord
OPTIONS: RK-1 19" rack	adapter

Table 6: Technical Specifications ^1 of the OC-4 Quad Channel Video Isolator

INPUT: 4 composite video, 1Vpp/75Ω on BNC connectors

OUTPUT: 4 composite video, 1Vpp/75Ω on BNC connectors

BANDWIDTH (-3dB): 20MHz.

VIDEO S/N RATIO: 69dB.

POWER SOURCE: 230V AC, 50/60Hz, (115V AC, USA)

DIMENSIONS: 19 " x 7 " x 1U W, D, H, rack mountable

WEIGHT: 3.5kg (7.8lbs) approx.

ACCESSORIES: Power cord

LIMITED WARRANTY

Kramer Electronics (hereafter K) 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. The following are not covered by the warranty:

1. Any product which is not distributed by Kramer, or which is not purchased from an authorized Kramer dealer. If you are uncertain as to whether a dealer is authorized, please contact Kramer at one of the agents listed in the Web site www.kramerelectronics.com.

2. Any product, on which the serial number has been defaced, modified or removed, or on which the WARRANTY VOID IF TAMPERED sticker has been torreattached, removed or otherwise interfered with.

3. Damage, deterioration or malfunction resulting from:

i) Accident, misuse, abuse, neglect, fire, water, lightning or other acts of nature
ii) Product modification, or failure to follow instructions supplied with the product
iii) Repair or attempted repair by anyone not authorized by Kramer
iv) Any shipment of the product (claims must be presented to the carrier)
v) Removal or installation of the product
vi) Any other cause, which does not relate to a product defect
vii) Cartons, equipment enclosures, cables or accessories used in conjunction with the product

WHAT WE WILL PAY FOR AND WHAT WE WILL NOT PAY FOR

We will pay labor and material expenses for covered items. We will not pay for the following:

1. Removal or installations charges.
2. Costs of initial technical adjustments (set-up), including adjustment of user controls or programming. These costs are the responsibility of the Kramer dealer from whom the product was purchased.
3. Shipping charges.

HOW YOU CAN GET WARRANTY SERVICE

1. To obtain service on you product, you must take or ship it prepaid to any authorized Kramer service center.
2. Whenever warranty service is required, the original dated invoice (or a copy) must be presented as proof of warranty coverage, and should be included in any shipment of the product. Please also include in any mailing a contact name, company, address, and a description of the problem(s).
3. For the name of the nearest Kramer authorized service center, consult your authorized dealer.

LIMITATION OF IMPLIED WARRANTIES

All implied warranties, including warranties of merchantability and fitness for a particular purpose, are limited in duration to the length of this warranty.

EXCLUSION OF DAMAGES

The liability of Kramer for any effective products is limited to the repair or replacement of the product at our option. Kramer shall not be liable for:

1. Damage to other property caused by defects in this product, damages based upon inconvenience, loss of use of the product, loss of time, commercial loss; or:
2. Any other damages, whether incidental, consequential or otherwise. Some countries may not allow limitations on how long an implied warranty lasts and/or do not allow the exclusion or limitation of incidental or consequential damages, so the above limitations and exclusions may not apply to you.

This warranty gives you specific legal rights, and you may also have other rights, which vary from place to place.

NOTE: All products returned to Kramer for service must have prior approval. This may be obtained from your dealer.

This equipment has been tested to determine compliance with the requirements of:

EN-50081: "Electromagnetic compatibility (EMC); generic emission standard.

Residential, coPaneticial and light industry"

EN-50082: "Electromagnetic compatibility (EMC) generic immunity standard. Part 1: Residential, commercial and light industry environment".

CFR-47: FCC Rules and Regulations: Part 15: “Radio frequency devices Subpart B Unintentional radiators”

CAUTION!

Servicing the machines can only be done by an authorized Kramer technician. Any user who makes changes or modifications to the unit without the expressed approval of the manufacturer will void user authority to operate the equipment.
Use the supplied DC power supply to feed power to the machine.
☒ Please use recommended interconnection cables to connect the machine to other components.

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.

Caution

Safety Warning:

Disconnect the unit from the power supply before opening/servicing.

CE