Tektronix FCA3100 counter driver

docs/examples/Tektronix_FCA3100.ipynb

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+{
+ "cells": [
+  {
+   "cell_type": "code",
+   "execution_count": 1,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "from qcodes_contrib_drivers.drivers.Tektronix.FCA3100 import FCA3100"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 2,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Connected to: TEKTRONIX FCA3000 (serial:579249, firmware:V1.32 26 May 2022 09:54) in 0.13s\n"
+     ]
+    }
+   ],
+   "source": [
+    "counter = FCA3100('counter', 'USB0::0x0699::0x3000::579249::INSTR', timeout=10)"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# overview over all parameters"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 3,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "counter:\n",
+      "\tparameter     value\n",
+      "--------------------------------------------------------------------------------\n",
+      "IDN            :\t{'vendor': 'TEKTRONIX', 'model': 'FCA3000', 'serial': '57924...\n",
+      "counter_axis   :\t[ 0.  1.  2.  3.  4.  5.  6.  7.  8.  9. 10.] (#)\n",
+      "samples_number :\t11 \n",
+      "threshold_A    :\t0 (V)\n",
+      "threshold_B    :\t0.036 (V)\n",
+      "time_array     :\tNot available (s)\n",
+      "timeout        :\t10 (s)\n",
+      "timestats      :\tNot available (('s', 's', 's', 's'))\n"
+     ]
+    }
+   ],
+   "source": [
+    "counter.print_readable_snapshot(update=True)"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# Usage of the two main parameters"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "Let's get an example of the time statistics parameter (will return mean, stdev, min and max of a statistics containing samples_number number of samples)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 8,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "(0.01862650541, 7.4022264e-05, 0.01851450451, 0.01873824896)"
+      ]
+     },
+     "execution_count": 8,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "counter.timestats()"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "Let's get an example of the time array parameter (will return an array of timestamps of length samples_number)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 10,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "array([0.01856394, 0.01875304, 0.01868165, 0.01846251, 0.01853304,\n",
+       "       0.01867947, 0.01863655, 0.0185761 , 0.01863821, 0.01867253,\n",
+       "       0.01866243])"
+      ]
+     },
+     "execution_count": 10,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "counter.time_array()"
+   ]
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 3",
+   "language": "python",
+   "name": "python3"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 3
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython3",
+   "version": "3.11.7"
+  },
+  "nbsphinx": {
+   "execute": "never"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 2
+}

src/qcodes_contrib_drivers/drivers/Tektronix/FCA3100.py

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+import logging
+import numpy as np
+from typing import Any, Tuple
+from qcodes.instrument import VisaInstrument
+from qcodes.parameters import MultiParameter, Parameter, ParameterWithSetpoints
+from qcodes.validators import Arrays, Ints
+
+log = logging.getLogger(__name__)
+
+class TimeStatistics(MultiParameter):
+    """
+    Returns the statistical values of a timing statistics.
+    """
+    def __init__(self,
+                 name:str,
+                 instrument:"FCA3100",
+                 **kwargs: Any
+                 ) -> None:
+        """
+        Statistical values of a timing statistics.
+
+        Args:
+            name: name of the timing statistics
+            instrument: Instrument to which the timing statistic is bound to.
+        """
+
+        super().__init__(name=name,
+                         instrument=instrument,
+                         names=(
+                            f"{instrument.short_name}_{name}_mean",
+                            f"{instrument.short_name}_{name}_stddev",
+                            f"{instrument.short_name}_{name}_minval",
+                            f"{instrument.short_name}_{name}_maxval"),
+                         shapes=((), (),(),()),
+                         labels=(
+                            f"{instrument.short_name} {name} mean time",
+                            f"{instrument.short_name} {name} standard deviation",
+                            f"{instrument.short_name} {name} min value",
+                            f"{instrument.short_name} {name} max value"),
+                         units=('s', 's', 's', 's'),
+                         setpoints=((), (), (), ()),
+                         **kwargs)
+
+    def get_raw(self) -> Tuple[float, float, float, float]:
+        """
+        Gets data from the instrument
+
+        Returns:
+            Tuple: Statistical values of the time statistic
+        """
+        assert isinstance(self.instrument, FCA3100)
+        self.instrument.write('CALCulate:AVERage:STAT 1')
+        self.instrument.write('INIT') # start measurement
+        self.instrument.ask('*OPC?') # wait for it to complete
+        reply = self.instrument.ask("CALCulate:AVERage:ALL?")
+        mean, stddev, minval, maxval, _ = reply.split(",")
+
+        return float(mean), float(stddev), float(minval), float(maxval)
+
+class CompleteTimeStatistics(ParameterWithSetpoints):
+    def __init__(self,
+                 name:str,
+                 instrument:"FCA3100",
+                 **kwargs: Any
+                 ) -> None:
+        """
+        Parameter for a complete time statistics containing all measured switching times.
+
+        Args:
+            name: name of the complete time statistics
+            instrument: Instrument to which the complete time statistic is bound to.
+        """
+        super().__init__(name=name,
+                         instrument=instrument,
+                         label='Times till switching',
+                         unit='s',
+                         docstring='Arrays of switching times',
+                         **kwargs)
+
+    def get_raw(self) -> np.ndarray:
+        """
+        Gets the data from the instrument.
+
+        Returns:
+            np.ndarray: Array of swithing times
+        """
+        assert isinstance(self.instrument, FCA3100)
+        self.instrument.write('CALCulate:AVERage:STATe 0')
+        self.instrument.write('ARM:COUN {}'.format(self.instrument.samples_number.get_latest()))
+        data_str=self.instrument.ask("READ:ARRay? {}".format(self.instrument.samples_number.get_latest()))
+        data = np.array(data_str.rstrip().split(",")).astype("float64")
+        return data
+
+class GeneratedSetPoints(Parameter):
+    """
+    A parameter that generates a setpoint array from start, stop and num points
+    parameters.
+    """
+    def __init__(self, numpointsparam, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        self._numpointsparam = numpointsparam
+
+    def get_raw(self):
+        return np.arange(self._numpointsparam())
+
+
+class FCA3100(VisaInstrument):
+    """
+    This is the qcodes driver for the FCA3100 counter
+    """
+
+    def __init__(self,
+                 name: str,
+                 address: str,
+                 terminator : str="\n",
+                 timeout    : int=10,
+                 **kwargs) -> None:
+        """
+        Qcodes driver for the Textronix FCA3100 frequency counter.
+
+        Args:
+            name: Name of the instrument
+            address: Address of the instrument
+            terminator (optional): Terminator character of
+                the string reply. Defaults to "\\n".
+            timeout (optional): VISA timeout is set purposely
+                to a long time to allow long measurements. Defaults to 10.
+        """
+
+        super().__init__(name = name,
+                         address = address,
+                         terminator = terminator,
+                         timeout = timeout,
+                         device_clear = False,
+                         **kwargs)
+
+        self.write('INIT:CONT 0')
+
+        self.add_parameter(name='timestats',
+                           parameter_class=TimeStatistics)
+
+        self.add_parameter(name='samples_number',
+                           label='samples_number',
+                           get_cmd='CALCulate:AVERage:COUNt?',
+                           set_cmd='CALCulate:AVERage:COUNt {}',
+                           get_parser=float,
+                           vals=Ints(2, int(2e9)),
+                           docstring='Number of samples in the current statistics sampling'
+                           )
+
+        self.add_parameter('counter_axis',
+                           unit='#',
+                           label='Counter Axis',
+                           parameter_class=GeneratedSetPoints,
+                           numpointsparam=self.samples_number,
+                           vals=Arrays(shape=(self.samples_number.get_latest,)))
+
+        self.add_parameter(name='threshold_A',
+                          label='threshold_A',
+                          get_cmd='INPut1:LEVel?',
+                          set_cmd='INPut1:LEVel {}',
+                          get_parser=float,
+                          unit='V',
+                          docstring='Absolute voltage trigger threshold channel A'
+                          )
+
+        self.add_parameter(name='threshold_B',
+                          label='threshold_B',
+                          get_cmd='INPut2:LEVel?',
+                          set_cmd='INPut2:LEVel {}',
+                          get_parser=float,
+                          unit='V',
+                          docstring='Absolute voltage trigger threshold channel B'
+                          )
+
+        self.add_parameter(name='time_array',
+                           parameter_class=CompleteTimeStatistics,
+                           setpoints=(self.counter_axis,),
+                           vals=Arrays(shape=(self.samples_number.get_latest,))
+                           )
+
+        self.connect_message()