Kepco Magnet driver

qcodes/instrument_drivers/Kepco/KepcoMagnet.py

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+from qcodes.instrument.base import Instrument
+from qcodes.utils.validators import Numbers
+import qcodes as qc
+
+from typing import Union
+
+class KepcoMagnet(Instrument):
+    MAX_AMP = 20
+
+    """
+    This is the qcodes driver for controlling the field using the Kepco BOP 20-20M.
+
+    This is a virtual driver only and will not talk to your instrument.
+    """
+
+    def __init__(self, name, parameter, max_field, volt_to_amp, field_to_amp,axis,rate=0.2, **kwargs):
+        super().__init__(name, **kwargs)
+
+        self.v1 = parameter
+
+        self.max_field = max_field
+        self.volt_to_amp = volt_to_amp
+        self.field_to_amp = field_to_amp
+        self.axis=axis
+        self.rate=rate
+
+        self.v1.vals = Numbers(-self.MAX_AMP / volt_to_amp,
+                               self.MAX_AMP / volt_to_amp)
+
+        self.add_parameter('minmax',
+                           label='Maximum field value',
+                           unit='T',
+                           vals=Numbers())
+
+
+        self.add_parameter('{}_BField'.format(axis),
+                           label='{} magnetic field'.format(axis),
+                           unit='T',
+                           get_cmd=self.get_field,
+                           set_cmd=self.set_field,
+                           vals=Numbers(-max_field, max_field))
+
+    def set_field(self, value: Union[int, float]) -> None:
+        instrument_value = value * self.field_to_amp / self.volt_to_amp
+        delay=0.1
+        step = (self.rate * self.field_to_amp / self.volt_to_amp) * delay / 60
+        range = abs(self.v1() - instrument_value)
+        npoints = round(range/step)
+        qc.Loop(self.v1.sweep(self.v1(), instrument_value, num=npoints), delay=delay).each(self.v1).run()
+
+    def get_field(self) -> Union[int, float]:
+        """
+        Returns:
+            number: value at which was set at the sample
+        """
+        value = self.v1.get() / self.field_to_amp * self.volt_to_amp
+        return value
+
+    def get_idn(self):
+        vendor = 'Ithaco (DL Instruments)'
+        model = '1211'
+        serial = None
+        firmware = None
+        return {'vendor': vendor, 'model': model,
+                'serial': serial, 'firmware': firmware}