fixes #259

Author: prjemian

apstools/synApps/swait.py

@@ -46,6 +46,7 @@
     DynamicDeviceComponent as DDC,
     FormattedComponent as FC)
 from ophyd import EpicsSignal, Signal
+from ophyd.signal import EpicsSignalBase
 
 from ._common import EpicsRecordDeviceCommonAll, EpicsRecordFloatFields
 from .. import utils as APS_utils
@@ -228,7 +229,7 @@ def _setup_peak_swait_(calc, desc, swait, ref_signal, center=0, width=1, scale=1
     """
     # consider a noisy background, as well (needs a couple calcs)
     assert(isinstance(swait, SwaitRecord))
-    assert(isinstance(ref_signal, Signal))
+    assert(isinstance(ref_signal, EpicsSignalBase))
     assert(width > 0)
     assert(0.0 <= noise <= 1.0)
     swait.reset()