Software Trigger Example

Adding nonworking reference code showing software triggering with the 26x4B SMU instruments.

Instrument_Examples/Series_2600/Triggering/Software_trig_26x4B.py

@@ -0,0 +1,71 @@
+"""
+Software-trig_26x4B
+
+    ************************************************************************
+    *** Copyright Tektronix, Inc.                                        ***
+    *** See www.tek.com/sample-license for licensing terms.              ***
+    ************************************************************************
+
+Description:
+	This python script was written by Keithley Apps Engineer Andrea Clary. 
+
+    The 2604B, 2614B, and 2634B are lower priced versions of the 2602B, 2612B,
+    and 2636B. They have no digital I/O for external triggering on the DB25 
+    connector. Additionally, they have no TSP-Link for triggering and communicating
+    with other TSP enabled instruments. They also have no contact check feature
+    and the 2634B lacks the low, 100pA measure range of the 2636B. 
+
+    For triggering and coordinating instruments, a software or bus trigger
+    should be used. 
+
+    This NON-FUNCTIONAL python code shows how the trigger model can be used to wait 
+    for the *TRG software trigger. When the smuX.trigger.initiate() command is sent, 
+    the SMU moves from the IDLE state and into the yellow Arm Layer. We’ve 
+    assigned the Arm Event Detector to use the trigger.EVENT_ID() as a stimulus 
+    which occurs when the *TRG is issued.
+
+    After the *TRG stimulus is received, the operation will advance into the green 
+    Trigger Layer and carry out the 7-point list sweep. The two entries in the 
+    source list will just be toggled thru, 7 times: 0, 5, 0, 5, 0, 5, 0
+
+    This script illustrates how the *TRG issued by the PC is an available means 
+    to coordinate SMU action with external devices.
+
+    This script will not work without additional code to connect to my_instr 
+    using pyVISA or another VISA layer command set. 
+
+"""
+
+my_instr.write("reset()")
+my_instr.write("errorqueue.clear()")
+
+my_instr.write("smu = node[1].smua")
+
+my_instr.write("smu.nvbuffer1.clear()")
+my_instr.write("smu.nvbuffer1.appendmode = 1")
+my_instr.write("smu.nvbuffer2.clear()")
+my_instr.write("smu.nvbuffer2.appendmode = 1")
+
+my_instr.write("smu.source.func = smu.OUTPUT_DCVOLTS")
+my_instr.write("smu.source.rangev = 5")
+my_instr.write("smu.source.limiti = 0.01")
+
+my_instr.write("smu.trigger.source.action = smu.ENABLE")
+my_instr.write("smu.trigger.source.listv({0,5})")
+my_instr.write("smu.trigger.source.limiti = 0.01")
+my_instr.write("smu.trigger.measure.action = smu.ENABLE")
+my_instr.write("smu.trigger.measure.iv(smu.nvbuffer1, smu.nvbuffer2)")
+my_instr.write("smu.trigger.endpulse.action = smu.SOURCE_HOLD")
+my_instr.write("smu.trigger.endsweep.action = smu.SOURCE_IDLE")
+my_instr.write("smu.trigger.count = 7")
+my_instr.write("smu.trigger.arm.stimulus = trigger.EVENT_ID") # wait for the *TRG command
+my_instr.write("smu.trigger.source.stimulus = 0")
+my_instr.write("smu.trigger.measure.stimulus = 0")
+my_instr.write("smu.trigger.endpulse.stimulus = 0")
+
+my_instr.write("smu.source.output = smu.OUTPUT_ON")
+my_instr.write("smu.trigger.initiate()")
+
+#after some delay the *TRG is sent
+time.sleep(3)
+my_instr.write("*TRG")