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frappy_psi.ah2700: auto create loss module with Pinata

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the loss angle is a separate quantity, which is preferred to
be an extra module. create this automatically.

Change-Id: I97f6be48f3411d8143f2ff85c2c61711fc71e8d6
Reviewed-on: https://forge.frm2.tum.de/review/c/secop/frappy/+/33908
Tested-by: Jenkins Automated Tests <pedersen+jenkins@frm2.tum.de>
Reviewed-by: Markus Zolliker <markus.zolliker@psi.ch>
This commit is contained in:
zolliker 2024-06-11 17:12:47 +02:00
parent 6837b82791
commit 8b27e4012c
1 changed files with 26 additions and 8 deletions
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34
frappy_psi/ah2700.py
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@ -17,7 +17,16 @@
# Module authors:
# Markus Zolliker <markus.zolliker@psi.ch>
# *****************************************************************************
"""Andeen Hagerling capacitance bridge"""
"""Andeen Hagerling capacitance bridge
two modules: the capacitance itself and the loss angle
in the configuration file, only the capacitance module needs to be configured,
while the loss module will be created automatically.
the name of the loss module may be configured, or disabled by choosing
an empty name
"""
from frappy.core import FloatRange, HasIO, Parameter, Readable, StringIO, nopoll, \
Attached, Property, StringType
@ -30,21 +39,22 @@ class Ah2700IO(StringIO):
class Capacitance(HasIO, Pinata, Readable):
value = Parameter('capacitance', FloatRange(unit='pF'))
freq = Parameter('frequency', FloatRange(unit='Hz'), readonly=False, default=0)
voltage = Parameter('voltage', FloatRange(unit='V'), readonly=False, default=0)
loss_name = Property('name of loss modules (default: <name>_loss)',
loss_name = Property('''name of loss module (default: <name>_loss)
configure '' to disable the creation of the loss module
''',
StringType(), default='$_loss')
# loss = Parameter('loss', FloatRange(unit='deg'), default=0)
ioClass = Ah2700IO
loss = 0
loss = 0 # not a parameter
def scanModules(self):
if self.loss_name:
# if loss_name is not empty, we tell the framework to create
# a Loss module with this name, and config below
# a module for the loss with this name, and config below
yield self.loss_name.replace('$', self.name), {
'cls': Loss,
'description': f'loss value of {self.name}',
@ -55,9 +65,9 @@ class Capacitance(HasIO, Pinata, Readable):
self.communicate('SERIAL ECHO OFF')
reply = self.communicate('SI')
if not reply.startswith('F='): # this is probably an error message like "LOSS TOO HIGH"
self.status = [self.Status.ERROR, reply]
self.status = self.Status.ERROR, reply
return self.value
self.status = [self.Status.IDLE, '']
self.status = self.Status.IDLE, ''
# examples of replies:
# 'F= 1000.0 HZ C= 0.000001 PF L> 0.0 DS V= 15.0 V'
# 'F= 1000.0 HZ C= 0.0000059 PF L=-0.4 DS V= 15.0 V OVEN'
@ -104,6 +114,14 @@ class Loss(Readable):
cap = Attached()
value = Parameter('loss', FloatRange(unit='deg'), default=0)
def initModule(self):
super().initModule()
self.cap.registerCallbacks(self, ['status']) # auto update status
def update_value(self, _):
# value is always changed shortly after loss
self.value = self.cap.loss
@nopoll
def read_value(self):
self.cap.read_value()