reorganized channels and shutter

beamline/components.py

@@ -1,3 +1,5 @@
+from loguru import logger
+
 from slic.devices.xoptics.aramis_attenuator import Attenuator
 from slic.devices.xoptics.pulsepicker import PulsePicker
 from slic.devices.xdiagnostics.intensitymonitor import IntensityMonitorPBPS
@@ -12,8 +14,18 @@ from .pp_shutter import PP_Shutter
 upstream_attenuator = Attenuator("SARFE10-OATT053", description="Aramis attenuator OATT053")
 attenuator = Attenuator("SAROP31-OATA150", description="Cristallina attenuator OATA150")
 
+def test_attenuators():
+    for att in (upstream_attenuator, attenuator):
+        tfundamental = att.get_transmission()
+        try:
+            assert tfundamental > 0
+        except TypeError:
+            logger.warning("No transmission value reported from {att.ID}")
+
+test_attenuators()
+
 # Shutter
-shutter = PP_Shutter(
+pp_shutter = PP_Shutter(
     "SARES30-LTIM01-EVR0:RearUniv0-Ena-SP", name="Cristallina pulse picker shutter"
 )  # Shutter button when using the pulse picker