iworx CB Sciences ETH-250 Bridge/Bio Amplifier Maclab ECG EMG Bioamplifier 255 We gladly ship to most countries! Email us for a Quote
Iworx/ CB Sciences ETH-250 Combination Bridge and ECG/EMG Amplifier Auction Includes a ETH-250 unit. below is a description of the similar eth-255 unit. Overview The ETH-255 is a combination transducer and ECG/EMG amplifier. Its controls, filter settings and gains were selected with these applications in mind, thereby making it well suited for the student physiology and the research lab. The ETH-255 is powered by a wall transformer (12 Volts AC 1000mA). It connects to the ETH-255 with a standard 3.0mm phono plug through a receptacle on the rear panel. The ETH-255 uses an optically isolated pod and patient cable for recording biopotentials (EEG, ECG, EMG) from human subjects. Under no circumstances should human subjects be connected to the ETH-255 without employing this pod and cable. Using the biopotential pod and cable, the ETH-255 can allow display of any of the 12 ECG lead positions. You can change which leads are displayed by manually changing connectors. Front Panels and Controls The ETH-255 is divided into two identical functional units (Figure 2- 1 on page 7), capable of making low noise AC coupled recordings of bioelectric potentials or DC coupled transducer recordings. Four knobs control each channel, the functions of which are described below. High-Pass Filter The high-pass filter selects the function of the channel and has four positions. The position DC couples the input and is used for measuring from whetstone, bridge-style transducers or other groundreferenced sensors requiring impedance conversion, such as pH electrodes or Ion Selective Electrodes (ISEs). There are three high pass filter settings, 0.03, 0.3 and 3Hz, which are used for ECG, EEG and EMG respectively. The higher the value of the AC coupling filter, the more signal contributions from body movement or breathing are removed and the more stable the baseline becomes. Input Offset The amplifier will output a baseline signal in either bridge (DC) or bio (0.03, 0.3 and 3Hz) mode. This signal level can be moved up (positively) or down (negatively) by using the input offset knob. This control is of greatest use in bridge mode where adjustments to zero the output of a transducer or maximize the use of the screen or paper display area are required. Gain Each channel of the ETH-255 has independently adjustable gain. This allows very small signals to be amplified before presentation to the display device. The gain control allows you to select among four preset multipliers; x1, x10 x100 and x1000. Low-Pass Filter (Hz) The low-pass filter control sets the upper limit of frequencies measurable by the ETH-255. The wide band (WB) setting offers a maximum frequency response of about 10kHz. Other settings may be chosen to limit noise. For example, the 50Hz filter removes all signals above 50Hz. This, of course, includes powerline noise, the most common source of electrical interference. For very slow signals such as output from force or pressure transducers, the 4Hz setting will provide the quietest recording. Auction Incudes ETH-250 unit, Power Cord. For more information, click here to view the similar ETH-255 datasheet Don't forget to place your bid.
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