Closedown

script/keithley.py

@@ -62,13 +62,34 @@ class Keithley(object):
         2) set user mode, set range
         
         """
-        self.dosetdefaultCh.write(1)
-        self.scanCh.write(9)
+        #self.dosetdefaultCh.write(1)
+        #self.scanCh.write(9)
         
     def prepare(self, dwell, triggered):
+        """
+        prepare keithley for gpib polling.
+
+        setting keithley parameters has several issues.
+        the dwell time and trigger mode cannot be set programmatically at the moment.
+        the user should select poll slow (100 ms), medium (20 ms) or fast (2 ms).
+        this method just reads the current value and stores it in self.dwell.
+        
+        dwell: dwell time in seconds.
+            0.1 - 20.0 in triggered mode,
+            0.1 - 1.0 in free running mode.
+        triggered:
+            True: wait for self.trig call and trigger once per call.
+            False: 1 Hz free run using EPICS SCAN attribute.
+        """
+        self.triggered = False
+        self.dwell = self.tottimeCh.read() / 1000.
+
+    def prepare_not_working(self, dwell, triggered):
         """
         prepare keithley for gpib polling:
         scan passive, bus triggered, set dwell time
+
+        this doesn't to work.
         
         dwell: dwell time in seconds.
             0.1 - 20.0 in triggered mode,
@@ -142,6 +163,7 @@ class Keithley(object):
         _do nothing for now!_
         """
         return None
+        
         self.nplcCh.write(5.)
         self.navgCh.write(1.)
         self.scanCh.write(6)

script/local.py

@@ -111,10 +111,10 @@ from keithley import KeiSample, KeiReference
 
 def prepare_keithleys(dwell, triggered):
     """
-    prepare keithleys for gpib polling:
-    passive, bus triggered, dwell time
-    
-    dwell = dwell time in seconds (0.1 - 20.0)
+    prepare keithleys.
+
+    at the moment, the dwell time has to be set manually by selecting one of the poll modes
+    slow = 100 ms, medium = 20 ms, fast = 2 ms.
     """
     KeiSample.prepare(dwell, triggered)
     KeiReference.prepare(dwell, triggered)
@@ -130,7 +130,6 @@ def trig_keithleys():
 def wait_keithleys():
     """
     wait for one dwell time so that the keithleys can finish their measurement.
-    if we polled them too early, they would produce an error message.
     """
     time.sleep(KeiSample.dwell * 2.2)
 
@@ -325,7 +324,7 @@ def after_scan():
     Close shutter and turn off analyser
     """
     caput("X03DA-PC:AFTER-SCAN.PROC", 1)
-    release_keithleys()
+    #release_keithleys()
     
 def set_adc_averaging(dwelltime=0.0):
     if dwelltime == 0.0:

script/optics/PhotonFluxSpectrum.py

@@ -8,9 +8,9 @@ AuxCurrent: not connected
 
 import time
 
-RANGE = "G1200 full"
+#RANGE = "G1200 full"
 #RANGE = "G600 full"
-#RANGE = "C K-edge"
+RANGE = "C K-edge"
 BEAM = "G1200 1x1"
 #BEAM = "G1200 6x10"
 
@@ -36,8 +36,6 @@ elif RANGE == "C K-edge":
     LATENCY = 1.0
     DWELL = 1.0
 
-prepare_keithleys(DWELL, False)
-
 if BEAM == "G600 1x1":
     # G600 1x1 reference sscan_2268 (elog:119)
     #SampleCurrentGain.write("L, 10^7")
@@ -92,6 +90,7 @@ else:
 
 POSITIONERS = (Eph)
 SENSORS = (SampleCurrent, RefCurrent, MachineCurrent)
+set_adc_averaging()
 time.sleep(5.)
 
 lscan(POSITIONERS, SENSORS, STARTPOS, ENDPOS, STEPS, LATENCY, before_read=before_readout, after_read=after_readout)