Hi Will,

Thanks for your feeback. You're right about my system specific differences, even for param dt =0.05 I get a median of 0.058.

I've attempted to implent the firmware changes outlined as I only need a sample rate of 115Hz however I haven't noticed any difference. I'm not very familar with arduino programming and I suspect I haven't implmented the changes in ps_system_state.cpp correctly. I've attached my changes in hopes that you might notice some sort of obvious error.

Regards

Blair

void SystemState::serviceDataBuffer()
    {
        // Check for last sample flag to see if done
        bool run_complete = false;
        if (lastSampleFlag_)
        {
            if ((run_complete = true));
        }

       		 // Empty data buffer
        	size_t buffer_size;
        	ATOMIC_BLOCK(ATOMIC_RESTORESTATE)
        	{
            	buffer_size = dataBuffer_.size();
        	}

        	while (buffer_size > 0)
        	{
            	Sample sample;
            	ATOMIC_BLOCK(ATOMIC_RESTORESTATE)
            	{
              	  	sample = dataBuffer_.front();
                	dataBuffer_.pop_front();
                	buffer_size = dataBuffer_.size();
            	}
            		messageSender_.sendSample(sample);
        	}

        	// Send indication that the run is complete 
        	if (run_complete)
        	{
            	messageSender_.sendSampleEnd();
            	lastSampleFlag_ = false;
        	}
    	}

I've been attempting to use the rodeostat to perform AC voltammetry as per the example and using the 50k dummy cell which gives a nice output at very low sample rates however at higher sample rates (though still quite low) of 115 Hz I've found the output is heavily affected by the sample rate.
I also implement the firmware changes as mentioned in this post however noticed no effect.

Any advice on how to overcome this would be greatly appreciated

2 Hz

115 Hz

I've used the following parameters

Run parameters

    t0 = 0.0  # Transition start time (s)
    t1 = 8.0  # Transition stop time (s)

    v0 = -0.1  # Initial voltage (V)
    v1 =  -0.9  # Final voltage (V)

    amp = 0.1  # Sinusoid ampliude (V)
    per = 0.5  # Sinusoid period (s)

    dt = 0.005  # Time step for setting voltage and measurements
    t_total = t0 + t1 # Total experiment duration 

    volt_func = create_sin_linear_func(t0,t1,v0,v1,amp,per)

    # Create device object, set voltage/current ranges and run test
    pstat = Potentiostat('COM5')
    pstat.set_volt_range('2V')
    pstat.set_curr_range('100uA')
    t, volt, curr = run_manual_test(pstat, volt_func, dt, t_total)