WikiSysop: Created page with "== Cryostat Python Control Software == ===SetupCryostat()=== in robot.py ''Set up Oxford ITC503 Cryostat to default parameters'' def SetupCryostat(sensor=2, tries=5) sen..."

2011-07-14T16:40:28Z

Created page with "== Cryostat Python Control Software == ===SetupCryostat()=== in robot.py ''Set up Oxford ITC503 Cryostat to default parameters'' def SetupCryostat(sensor=2, tries=5) sen..."

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== Cryostat Python Control Software ==

===SetupCryostat()===
in robot.py

''Set up Oxford ITC503 Cryostat to default parameters''

def SetupCryostat(sensor=2, tries=5)

sensor: sensor # to control against: 1=gas inlet; 2=cold block (default); 3=spare

tries: number of repeats to try when sending the command before giving up (default is 5)

===GetCryostatT()===
in robot.py

''Read Oxford ITC503 cryostat temperatures''

def GetCryostatT(tries=5)

input: number of times to attempt read (defaults to 5)

returns a list of 3 temperatures: sensor1, sensor2, sensor3

===SetCryostatT()===
in robot.py

''Set Oxford ITC503 setpoint and optionally hold for temperature''

def SetCryostatT(setpoint, WaitFlag=True, Delay=5, MaxWait=120, DeltaT=2, tries=5):

setpoint (K) -- desired end T

WaitFlag (default=True) -- if True the routine will return once the temperature is reached (default),
False means return immediately after setting the ramp to begin

Delay (min) -- period of time to wait after initially reaching the desired temperature in min (default is 5)

MaxWait (min) -- maximum period to wait for the selected sensor to reach the Set Point in min.
If this period expires, an exception is thrown (defaults to 120)

DeltaT (K) -- allowed discrepancy between the selected sensor and the desired T to start the delay period (defaults to 2)

tries -- number of repeats to try when sending the command before giving up (defaults to 5)

===SweepCryostatT()===
in robot.py

''Sets Oxford ITC503 setpoint and optionally hold for temperature''

def SweepCryostatT(startpoint, endpoint, sweeptime, WaitFlag=False, MaxWait=1.25, tries=5):

startpoint (K) -- desired start T for Temp

endpoint (K) -- desired end T

sweeptime (min) -- desired time for change from startpoint to endpoint (minutes)

WaitFlag (default=False) -- if True the routine will return once the temperature is reached,
False means return immediately after setting the ramp to begin (default)

MaxWait (ratio) -- maximum period to wait for the sweep to complete as a ratio of the sweep time.
Default is 1.25, meaning to wait 125% of sweeptime,
If this period expires, an exception is thrown.

tries -- number of repeats to try when sending the command before giving up (defaults to 5)

===Example Code===
s11bmwork% /APSshare/bin/python
Python 2.5.2 (r252:60911, Jan 28 2009, 15:33:22)
[GCC 4.1.2 20070626 (Red Hat 4.1.2-13)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import sys
>>> sys.path.append('/local/11BMcontrol/MailIn')
>>> import robot
>>> robot.GetCryostatT()
(1.3999999999999999, 407.80000000000001, 273.39999999999998)
>>>

>>> robot.gui.Sleep(1)
>>> robot.SweepCryostatT(1,2,1)
False
True
False
>>> robot.SweepCryostatT(1,2,1,WaitFlag=True)
True
False
>>>

Python Control Software - Revision history

WikiSysop: Created page with "== Cryostat Python Control Software == ===SetupCryostat()=== in robot.py ''Set up Oxford ITC503 Cryostat to default parameters'' def SetupCryostat(sensor=2, tries=5) sen..."