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    Technical  Specifications / Operation 
                                             ELECTROMYOGRAPH
 
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Operation : 
The needle or surface  electrodes  are  attached on  the  muscle site to be studied ; and the cable connected to the EMG amplifier. Depending on userís  requirements, the sensitivity, time constant, bandwidth are selected.  The EMG Panel Meter gives indication of the average/peak level of the  EMG signal.  It can be connected  to any oscilloscope for study of EMG patterns. Using  optional nerve/muscle stimulators  and  oscilloscope, nerve-conduction velocity can also be calculated. 

Specifications : 
Input  Differential, isolated, with input impedance  greater  than  10 M.  
Common Mode Rejection Ratio : Greater than 80db with 10K source impedance. 
Sensitivity/Gain : Adjustable by  6-way Gain Selector with following gain settings :  1K, 2K, 5K,10K, 20K and 50K 
Fine gain Control: The gain  in each  setting  can  be  varied  from 1 : 0 .5, with a potentiometer.  
Noise output:Less than 10 m V. 
Frequency Response: 0.1 to 10 KHz.  
Bandwidth  Limiter : Hi-cut  switch limits upper cut-off to 1Khz; 
Filter Facility: Notch-Filter to cut-off 50/60 Hz mains disturbance. 
Time Constant: Adjustable in the following 3 steps as follows : 1,2,5  and 15 seconds.  
Peak- Hold facility: If this switch is pressed, the output is held at the peak-to-peak value of the input signal. 
Reset Facility : Provision to reset the integrator/hold circuit to initial zero value.  
Outputs : (1) EMG socket for displaying the EMG signal wave form onto oscilloscope, tape-recorder, or  audio monitor ;  
(2) EMG Panel Meter : This gives the Average value or Peak to Peak value on a 0 to 5 scale. Meter range can be set to 0-500 m V or, 0-5V.  
Power consumption :  Less than 5 watts. 
Power Source: 220 or 110 volts/50Hz mains supply ; or alternately, 2 Nos: 9 volt alkaline batteries (Duracell MN1604 6LR61 or equivalent) 
Size/Weight: 22x11x15 cms/3 Kgs.

 
 
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