FetCh - FET Characterisation Suite

Measurement suite for common FET and other electrical measurements, based on the JISA library.

Fetching and Running FetCh

1. Make sure you have Java 11 or newer (download)
2. Download the executable jar file: FetCh.jar
3. Run the jar file (you should just need to double-click it)

Features

Action Queue

Queue up measurements and actions to automatically run one after the other, allowing you to fully customise your measurement routine

Sweeps

Automatically generate queue actions by using a sweep. Just specify the sweep points and what actions to undertake at each point. For instance, with a temperature sweep:

Live Plotting

Measurement data is plotted live as it comes in

Automatic Analysis

FetCh can take all results currently loaded and automatically determine how best to analyse them and plot the results

Extensible

Easily extend FetCh to run your own measurement routines by using the simple-to-understand Kotlin measurement framework defined by FetCh. Define new functionality and have FetCh generate the GUI for you around it, no GUI-programming experience required.

class IVCurve : FetChMeasurement("IV Curve") {

    // Define instruments needed for measurement
    val voltSource  by requiredInstrument("Voltage Source", VSource::class)
    val currMeter   by requiredInstrument("Ammeter", IMeter::class)
    val thermometer by optionalInstrument("Thermometer", TMeter::class)

    // Define user input parameters that FetCh should ask for
    val voltages by userInput("Voltages [V]", Range.linear(0, 60))
    val delay    by userTimeInput("Delay Time", 50)

    // Define columns of data table
    companion object : Columns() {
        val VOLTAGE     = decimalColumn("Voltage", "V")
        val CURRENT     = decimalColumn("Current", "A")
        val TEMPERATURE = decimalColumn("Temperature", "K")
    }
    
    // Measurement routine goes in here
    override fun run(results: ResultTable) {

        // Turn everything on
        voltSource.isOn   = true
        currMeter.isOn    = true
        thermometer?.isOn = true  // "?" means ignore if not set

        // Sweep over voltages, measuring current after delay each time
        for (voltage in voltages) {

            voltSource.voltage = voltage

            sleep(delay)
            
            results.mapRow(
                VOLTAGE     to voltage,
                CURRENT     to currMeter.current,
                TEMPERATURE to (thermometer?.temperature ?: Double.NaN), // Records "NaN" if no thermometer
            )

        }

    }

    // Cleanup when done
    override fun onFinish() {
        voltSource.isOn   = false
        currMeter.isOn    = false
        thermometer?.isOn = false
    }
    
}