timeout error from waitcomplete() function

[soha-namnabat]

Hi,
I am trying to use this driver to trigger a 2602B SMU to perform some measurements but I am facing timeout errors while using the waitcomplete function as suggested in the manual. Have you tried it ? and have seen it to work?

this is the lua code example I am trying to replicate :

smua.trigger.source.linearv(10, 100, 10)
smua.trigger.source.action = smua.ENABLE
-- Configure TRIG key press as input trigger for source action.
smua.trigger.source.stimulus = display.trigger.EVENT_ID
-- Command SMU to execute a single 10-point sweep.
smua.trigger.count = 10
smua.trigger.arm.count = 1
-- Turn on the output in preparation for the sweep
smua.source.output = smua.OUTPUT_ON
-- Start the sweep and clear the event detectors.
smua.trigger.initiate()
-- The SMU will wait for the front panel TRIG key press before executing
-- each source action.
-- Wait for the sweep to complete.
waitcomplete()

it works after pressing the TRG button on display for a couple times but then face timeout!
Do you get a similar problem? should I add python based pause ?

thanks
Soha

[samschott]

@soha-namnabat, I am not actually certain what the waitcomplete function does. From the Keithley 2600 reference manual:

This function will wait for all previously started overlapped commands to complete.

This definately applies to all measurements started with a smuX.measure.overlappedY() command but a triggered sweep may not qualify as such a group of "started overlapped commands".

Personally, I use a somewhat different approach in the voltage_sweep_single_smu method here:

# INITIATE MEASUREMENT
# prepare SMUs to wait for trigger
smu.trigger.initiate()

# send trigger
self.send_trigger()  # self._write("*trg")

# CHECK STATUS BUFFER FOR MEASUREMENT TO FINISH
# Possible return values:
# 6 = smua and smub sweeping
# 4 = only smub sweeping
# 2 = only smua sweeping
# 0 = neither smu sweeping

# while loop that runs until the sweep begins
while self.status.operation.sweeping.condition == 0:
    time.sleep(0.1)

# while loop that runs until the sweep ends
while self.status.operation.sweeping.condition > 0:
    time.sleep(0.1)

In the above code, self stands for the actual Keithley instance. Let me know if this works for you.