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Refa

Product catalog summary

Introduction
This document provides technical specifications for various configurations of the Refa device, supplementing the User Manual. It assists users in locating device labels and using the table of contents to find specific device specifications.

Device Specifications Overview
The document details multiple Refa device models, each identified by a unique REF code. Key specifications include unipolar ExG inputs for EEG, ECG, EOG, EMG, etc., with varying numbers of channels (e.g., 24, 32), RMS noise levels of less than 1 µV at the lowest sample frequency, gain settings typically 20x or 26.55x, input signal differences ranging from -150 mV to +150 mV, input impedance greater than 100 MΩ, and CMRR over 90 dB. Sampling frequencies reach up to 2048 Hz, with resolutions of 22 bits.

Digital and Auxiliary Inputs
Devices feature digital inputs with isolation over 4000 V and auxiliary inputs with specific RMS noise and gain characteristics. Connectors vary by model, including safety DIN, subD37, and micro coaxial options.

Channel and Connector Details
Each device model includes a detailed channel list, specifying the function, resolution, and range for each input. Connector pin assignments are provided for digital inputs and headcap connections, ensuring proper setup and usage.

Technical Specifications Overview
Resolution and Sampling Frequency: The document specifies a resolution of 24 bits for ExG and BIP inputs with a sensitivity of 0.01839 µV per bit, and for AUX inputs, 0.48828 µV per bit. Sampling frequencies available are 20000 Hz, 10000 Hz, 5000 Hz, 2500 Hz, and 1250 Hz.

Channel Configuration: The system supports multiple channel configurations, including unipolar and bipolar inputs. Unipolar inputs (ExG1 to ExG16) have a range of -150 mV to +150 mV, while bipolar inputs (BIP9 to BIP12) share the same range. Auxiliary inputs (AUX13 to AUX16) have a broader range of -3 V to +3 V.

Digital Inputs: The digital channel supports 8 bits, with inputs ranging from bit 0 to bit 7, and a sawtooth test signal ranging from 0 to 32767 bits. The digital input is facilitated through a DB25 connector.

Device Types and Specifications: The document details several device types, including Refa8-16e and Refa8-32e models, each with specific reference codes. These devices support 16 or 32 channels, respectively, with a common mode rejection ratio (CMRR) greater than 90 dB and input impedance over 100 MΩ.

Connectors and Isolation: Active shielded micro coax connectors are used per channel, with subD37 female connectors for 32 channels. Digital inputs are isolated with an optocoupler providing over 4000 V of isolation.

Headcap Connector Mapping: The document includes a mapping table for headcap connectors, detailing the relationship between DB37 pin numbers and channel numbers.

Technical Specifications Overview
Unipolar ExG Inputs: The system supports 32 unipolar ExG inputs suitable for EEG, ECG, EOG, and EMG measurements. These inputs have a gain of 26.55x, an input signal range of -150 mV to +150 mV, and an input impedance greater than 100 MΩ. The common mode rejection ratio (CMRR) is over 90 dB, ensuring high noise immunity. Connectors include active shielded micro coax per channel and subD37 female unshielded per 32 channels.

Bipolar ExG Inputs: There are 4 bipolar ExG inputs with similar specifications to the unipolar inputs, including a gain of 26.55x and a CMRR of over 90 dB. These inputs also feature active shielding with a 4-pin plastic connector.

AUX Inputs: The system includes 4 auxiliary inputs with a gain of 1x and an input signal range of -3 V to +3 V. The input impedance is greater than 100 MΩ, and the CMRR is over 70 dB. The output voltage is ±5 V with a maximum current of 20 mA for all channels combined, using a 5-pin plastic connector.

Digital Input: The digital input requires a turn-on current of 2 mA at 3 V, with a maximum input of 5 V. It features isolation greater than 4000 V via an optocoupler (H11L1) and uses an 8-bit DB25 female connector, with the first bit shared via a BNC female connector.

Sampling: The system supports simultaneous sampling of 40 channels with a resolution of 24 bits. The ExG and BIP channels have a resolution of 0.01839 µV per bit, while AUX channels have 0.48828 µV per bit. Sample frequencies include 10000 Hz, 5000 Hz, 2500 Hz, 1250 Hz, and 625 Hz.

Channel List: The document provides a detailed list of channels, including 32 unipolar ExG inputs, 4 bipolar inputs, 4 auxiliary inputs, and digital channels. Each channel is specified with its function, resolution, and range.

Connectors: The document details the pin configurations for digital input DB25 connectors and headcap connectors, specifying the relationship between signal channel numbers and connector pin numbers.

Technical Specifications Overview
Sampling and Resolution: The document outlines the sampling capabilities of a device with 40 to 72 channels, depending on the model. The resolution for ExG and BIP inputs is 24 bits, with specific microvolt per bit values for ExG, BIP, and AUX inputs. Sampling frequencies range from 128 Hz to 4000 Hz.

Channel Specifications: The document provides detailed specifications for each channel type, including unipolar ExG inputs, bipolar ExG inputs, and auxiliary inputs. Each channel type has specific resolution, range, and gain values. Unipolar inputs are used for EEG, ECG, EOG, and EMG, with a gain of 3.8x or 26.55x depending on the model. Bipolar inputs have a gain of 26.55x, and AUX inputs have a gain of 1x.

Input and Connector Details: The document specifies input signal differences, common mode ranges, input impedance, and CMRR for each input type. Connectors vary by input type, including active shielded micro coax and plastic connectors. Digital inputs are isolated with optocouplers and use DB25 and BNC connectors.

Channel List and Pin Configuration: Detailed channel lists are provided, including function, resolution, and range for each channel. The document also includes pin configurations for digital input connectors and headcap connectors, detailing the relationship between signal channel numbers and connector pin numbers.

Device Models: The document references different device models, such as Refa8-32e4b4a and Refa8-64e4b4a, each with specific technical specifications, including the number of channels, RMS noise levels, and gain values.

Technical Specifications Overview
1. Unipolar ExG Inputs:

Number of Channels: 64
RMS Noise: Less than 1 µV at the lowest sample frequency
Gain: 26.55x
Input Signal Difference: -150 mV to +150 mV at 0 V common signal
Input Common Mode Range: -2 V to +2 V at 0 V differential signal
Input Impedance: Greater than 100 MΩ
CMRR: Greater than 90 dB
Connectors: Active shielded micro coax per channel, subD37 female unshielded per 32 channels

2. Bipolar ExG Inputs:

Number of Channels: 4
RMS Noise: Less than 1 µV at the lowest sample frequency
Gain: 26.55x
Input Signal Difference: -150 mV to +150 mV at 0 V common signal (no positive overflow)
Input Common Mode Range: -2 V to +2 V at 0 V differential signal
Input Impedance: Greater than 100 MΩ
CMRR: Greater than 90 dB
Connector: 4 pin plastic connector, active shielding

3. AUX Inputs:

Number of Channels: 4
RMS Noise: Less than 20 µV at the lowest sample frequency
Gain: 1x
Input Signal Difference: -3 V to +3 V at 0 V common signal
Input Common Mode Range: -4 V to +4 V at 0 V differential signal
Input Impedance: Greater than 100 MΩ
CMRR: Greater than 70 dB
Output Voltage: +5 V & -5 V, max. 20 mA for all channels together
Connector: 5 pin plastic connector

4. Digital Input:

Input Turn-On Current: 2 mA at 3 V input, max. input = 5 V
Isolation: Greater than 4000 V, by means of optocoupler (H11L1)
Connector: 8 bit via DB25 female, shared first bit via BNC female

5. Sampling:

Number of Channels: 72 channels simultaneously
Resolution: 24 bits, ExG & BIP 0.01839 µV per bit, AUX 0.48828 µV per bit
Sample Frequency: 4000 Hz, 2000 Hz, 1000 Hz, 500 Hz, 250 Hz

6. Channel List:

Unipolar Inputs: 64 channels with a resolution of 0.01839 µV and a range of -150 mV to +150 mV
Bipolar Inputs: 4 channels with a resolution of 0.01839 µV and a range of -150 mV to +150 mV
Auxiliary Inputs: 4 channels with a resolution of 0.48828 µV and a range of -3 V to +3 V
Digital Channel: 1 bit with a range of 0 to 255
Sawtooth Test Signal: 1 bit with a range of 0 to 32767

7. Connectors:

Digital Input DB25 Connector: Pins for bits 0 to 7 and common ground
Headcap Connector: Describes the relation between signal channel numbers and headcap connector pin numbers

Technical Specifications Overview:
1. Input Channels:

Unipolar Inputs: 128 channels, resolution of 0.01839 µV, range from -150 mV to +150 mV.
Bipolar Inputs: 4 channels, same resolution and range as unipolar inputs.
Auxiliary Inputs: 4 channels, resolution of 0.48828 µV, range from -3 V to +3 V.
Digital Inputs: 8 bits, range from 0 to 255.

2. Connectors:

Unipolar and Bipolar: Active shielded micro coax per channel, subD37 female unshielded per 32 channels.
Auxiliary: 5 pin plastic connector.
Digital: DB25 female, shared first bit via BNC female.

3. Performance Parameters:

RMS Noise: Less than 1 µV for ExG inputs, less than 20 µV for AUX inputs.
Gain: 26.55x for ExG inputs, 1x for AUX inputs.
Input Impedance: Greater than 100 MΩ.
CMRR: Greater than 90 dB for ExG, greater than 70 dB for AUX.

4. Sampling:

Simultaneous sampling of 136 channels.
Resolution of 24 bits.
Sample frequencies: 2048 Hz, 1024 Hz, 512 Hz, 256 Hz, 128 Hz.

5. Additional Features:

Isolation: Greater than 4000 V via optocoupler.
Output Voltage: +5 V & -5 V, max. 20 mA for all channels together.

6. Connector Pin Mapping:

Detailed mapping for DB25 and DB37 connectors provided for channel and pin number associations.

Technical Specifications Summary
1. Unipolar Inputs
Inputs ExG54 to ExG128 are unipolar inputs with a resolution of 0.01839 µV and a range from -150 mV to +150 mV.

2. Bipolar Inputs
Inputs BIP129 to BIP132 are bipolar inputs with the same resolution and range as the unipolar inputs.

3. Auxiliary Inputs
Inputs AUX133 to AUX136 are auxiliary inputs with a resolution of 0.48828 µV and a range from -3 V to +3 V.

4. Digital Channels
Digital channel 'Digi' operates with 1-bit resolution and a range from 0 to 255. It includes digital input bits 0 to 7, with bits 8 to 15 reserved.

5. Sawtooth Test Signal
The 'Saw' channel provides a sawtooth test signal with 1-bit resolution and a range from 0 to 32767.

6. Digital Input DB25 Connector
Pin assignments for digital inputs are provided, with pin 2 corresponding to bit 0 and pin 9 to bit 7 (MSB). Pin 25 is the common ground.

7. Headcap Connector
The table describes the relationship between signal channel numbers and headcap connector pin numbers across four connectors, detailing the channel numbers associated with each DB37 pin.

Catalog excerpts

Refa Technical Specifications

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Technical Specifications Introduction This document includes the technical specifications of the available configurations of the Refa device. This document is supplementary to the User Manual provided with the product. Refer to the User Manual for instructions for use of the device. Use of this document 1. Locate the device label on your Refa device. The label can be found on the bottom of the device and looks like the picture depicted here: 2. Use the table of contents on the next pages to locate your device. The document is sorted on REF code that can be found on the label. 3. Click the correct...

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Technical Specifications Headcap connector This table describes the relation between signal channel numbers and headcap connector pin numbers.

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Technical Specifications Channel list:

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Technical Specifications Headcap connector This table describes the relation between signal channel numbers and headcap connector pin numbers.

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Technical Specifications Headcap connector This table describes the relation between signal channel numbers and headcap connector pin numbers.

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Technical Specifications RMS Noise Gain Input signal difference Input common mode range Input impedance CMRR Connectors

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Technical Specifications Channel list:

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Technical Specifications Headcap connector This table describes the relation between signal channel numbers and headcap connector pin numbers.

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Technical Specifications RMS Noise Gain Input signal difference Input common mode range Input impedance CMRR Connectors

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Technical Specifications Channel list:

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Technical Specifications Headcap connector This table describes the relation between signal channel numbers and headcap connector pin numbers.

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Technical Specifications Unipolar ExG inputs (EEG, ECG, EOG, EMG etc): RMS Noise < 1 pV (@ lowest sample frequency) Input signal difference -150 mV to +150 mV (@ 0 V common signal) Input common mode range -2 V to +2 V (@ 0 V differential signal) Input impedance > 100 MQ active shielded micro coax per channel subD37 female unshielded per 32 channels Digital input Input turn-on current Isolation Connector 2 mA @ 3 V input, max. input = 5 V > 4000 V, by means of optocoupler (H11L1) 8 bit via DB25 female, shared first bit via BNC female Sampling: Number of channels Resolution Sample...

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Technical Specifications Channel list:

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Technical Specifications Headcap connector This table describes the relation between signal channel numbers and headcap connector pin numbers.

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Technical Specifications Headcap connector This table describes the relation between signal channel numbers and headcap connector pin numbers.

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Technical Specifications Headcap connector This table describes the relation between signal channel numbers and headcap connector pin numbers.

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Technical Specifications Headcap connector This table describes the relation between signal channel numbers and headcap connector pin numbers.

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Technical Specifications Headcap connector This table describes the relation between signal channel numbers and headcap connector pin numbers.

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Technical Specifications Headcap connector This table describes the relation between signal channel numbers and headcap connector pin numbers.

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Technical Specifications Headcap connector This table describes the relation between signal channel numbers and headcap connector pin numbers.

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Technical Specifications Channel list:

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Technical Specifications Headcap connector This table describes the relation between signal channel numbers and headcap connector pin numbers.

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Technical Specifications Headcap connector This table describes the relation between signal channel numbers and headcap connector pin numbers.

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Technical Specifications Headcap connector This table describes the relation between signal channel numbers and headcap connector pin numbers.

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Technical Specifications Headcap connector This table describes the relation between signal channel numbers and headcap connector pin numbers.

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Technical Specifications Headcap connector This table describes the relation between signal channel numbers and headcap connector pin numbers.

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Technical Specifications Headcap connector This table describes the relation between signal channel numbers and headcap connector pin numbers.

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Technical Specifications Headcap connector This table describes the relation between signal channel numbers and headcap connector pin numbers.

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