BSL PRO 4 Manual - Biopac

332 BSL PRO ManualMP36/35 Input > Output ScalingThe MP36/35 hardware can pipe signals from any channel input to the output using the “CHX to Output”control panel in the BSL PRO software—due to the difference between the input and output range, there willbe a change in signal level (scaling). The output range depends on the MP device and the output pin used asshown in the following table. Note that when using MP35 output pin 2, there is an additional baseline offset(2.048 V) applied.Output Pin Pin Description Output Range(Analog Out port)(Volts)Pin 1* - MP36/35Headphones,-2.048 to +2.048A.C. CoupledPin 2 - MP36Low Voltage Stimulator, -10 to +10D.C. Coupled- MP35CH Data,0 to +4.095 VD.C. coupled(baseline offset of 2.048 V)The input range is gain dependant. The table below shows the scaling (multiplying) factors to use for eachgain setting.Example:GainInput Range+- millivoltsOutput Scale***—accurate to ±10%Factor 1 Factor 2Pin 1 (Headphone out)and Pin 2 (MP35 only)Pin 2 (Low VoltageStimulator) – MP36onlyx5** ± 2 V 1.024 5x10 ± 1 V 2.048 10x20 ± 500 mV 4.095 20x50 ± 200 mV 10.238 50x100 ± 100 mV 20.475 100x200 ± 50 mV 40.950 200x500 ± 20 mV 102.375 500x1,000 ± 10 mV 204.750 1,000x2,000 ± 5 mV 409.500 2,000x5,000 ± 2 mV 1023.750 5,000x10.000 ± 1 mV 2047.500 10,000x20,000 ± 0.5 mV 4095.000 20,000x50,000 ± 0.2 mV 10238.000 50,000Notes* 1: To properly measure the output signal you need at least a 2K Ohm load.** 2: x5 only available on MP36 and MP45.*** 3. Input to Output scaling is accurate to within 10%.MP35, input signal level = ±10 mV (20 mV- pk to pk), input gain = x100, Output on pin 2.Signal output level = 20 mV-pk to pk x 20.475 = 0.4095 V pk to pk.However there is a baseline offset of 2.048 V, so actual signal output level is:Lowest level = 2.048 V – (0.5 x 0.4095 V) = 1.843 VHighest level = 2.048 V + (0.5 x 0.4095 V) = 2.253 VVisit the online support center at www.biopac.com