Model PSI-1

• EXCELLENT FOR  ACCURATELY QUANTIFYING EMG DATA *
   

• AUTOMATIC INTEGRATOR RESET
   

• VARIABLE BIN WIDTHS
   

• EXTERNAL RESET FOR STIMULUS SYNCHRONIZATION
  

Description:

The Model PSI-1 is an instrument specifically designed for quantifying integrated EMG data into discrete bins. EMG data frequently requires rectification and integration to facilitate quantitative appreciation of overall amplitude for illustrations and for digitized data reduction. This novel pulsed integrator circuit allows the investigator to continuously adjust the time interval of integration from 1-10 msec and avoid the hysteresis and sampling time ambiguity of linear RC filters. A long time constant integrator is reset to zero after each sampling interval and the integral accumulated for that interval is saved by a sample and hold circuit for output during the next integration period. The investigator can also control overall signal gain, output DC level and input noise excluding level. The circuit features automatic gain control to stabilize output amplitude as the integration period is varied, and an external reset line to allow synchronizing the integration periods to an external event such as a stimulus pulse. The Model psi-1 is of modular construction and slides easily into the Model RP-1 rack mount power supply module cage system.

* Bak, M.J. and Loeb, G.E., "A pulsed integrator for EMG analysis" , Electroenceph. and Clin. Neurophys., 1979, 47:738-741.

PSI-1 (1)    Switch selects external interval control in place of internal clocking. One or more integrators can be synchronized to an external data collection device such as a computer by providing impulses at the desired rate to the RESET connector . . . .Price class C