def _set_position(self, pos, wait=None):
"""
Move to an absolute position, taking into account backlash.
When self.backlash is to a negative value the stage will always move
from low to high values. If necessary, a extra step with length
self.backlash is set.
:param pos: New position in mm
:param wait: wait until stage is finished
"""
# First do move to extra position if necessary
if self.backlash:
position = self.position.magnitude
# backlash = self.backlash.to('mm').magnitude
backlash = convert_to('mm', on_dimensionless='ignore')(
self.backlash).magnitude
if (backlash < 0 and position > pos) or \
(backlash > 0 and position < pos):
self.log_info('Using backlash')
self.__set_position(pos + backlash)
self._wait_until_done()
# Than move to final position
self.__set_position(pos)
if wait:
self._wait_until_done()
self.check_position(pos)
def test_return_float(self):
self.assertEqual(
processors.convert_to(V, return_float=True)(1 * mv), 0.001)
self.assertRaises(
ValueError,
processors.convert_to(V,
return_float=True,
on_incompatible='raise'), Hz)
self.assertWarns(
processors.DimensionalityWarning,
processors.convert_to(V, return_float=True,
on_incompatible='warn'), Hz)
self.assertEqual(
processors.convert_to(V,
return_float=True,
on_incompatible='ignore')(Hz), 1)
self.assertRaises(
ValueError,
processors.convert_to(V,
return_float=True,
on_dimensionless='raise'), 1000)
self.assertWarns(
processors.DimensionalityWarning,
processors.convert_to(V,
return_float=True,
on_dimensionless='warn'), 1000)
self.assertEqual(
processors.convert_to(V,
return_float=True,
on_dimensionless='ignore')(1000), 1000)
def _wait_until_done(self):
wait_time = convert_to('seconds', on_dimensionless='ignore')(self.wait_time)
time.sleep(wait_time)
while not self.motion_done:
time.sleep(wait_time)
return True