Measurement in progress error

[jessequinn]

The following error is received:

---

Uploaded TSP script: output-charact.tsp
Measurement in progress...
Traceback (most recent call last):
File "./test.py", line 18, in
keithley.Output(sample)
File "/Users/jessequinn/Downloads/keithley-2636-master/k2636.py", line 180, in Output
df = self.readBuffer()
File "/Users/jessequinn/Downloads/keithley-2636-master/k2636.py", line 104, in readBuffer
vg = [float(x) for x in self._query('printbuffer(1, smub.nvbuffer1.n, smub.nvbuffer1.sourcevalues)').split(',')]
File "/Users/jessequinn/Downloads/keithley-2636-master/k2636.py", line 104, in
vg = [float(x) for x in self._query('printbuffer(1, smub.nvbuffer1.n, smub.nvbuffer1.sourcevalues)').split(',')]
ValueError: could not convert string to float:

The following was modified in the output-charact.tsp

-- PARAMETERS
Vdmin = 0.0
Vdmax = -1.0
Vdstep = 0.1

Vgmin = 0.0
Vgmax = -1.0
Vgstep = 0.1

Any idea what is causing this? I am using MAC OSX with the following address 'USB0::0x05E6::0x2636::4042049::INSTR' to the Keithley 2636B

[peregrinescode]

Hi Jesse, only just seen this - have you fixed it? If not I will take a look.

[jessequinn]

i have not been able to fix.

[peregrinescode]

In the output-charact.tsp, try:

-- PARAMETERS
Vdmin = 0.0
Vdmax = 10
Vdstep = -0.1

Vgmin = 0.0
Vgmax = 10
Vgstep = -0.1

The above will achieve the scan range you want. The problem is with how I have defined things. Vdmax and Vgmax really mean the total number of steps not the max value. I will update the code to make it more comprehensible

[jessequinn]

cannot try now will in future. the other thing i wanted to do was measure hysteresis a forward and reverse scan for both output and transfer. can you help with this?

[peregrinescode]

For sure - the newest version of the code runs a transfer scan both forwards and backwards. To do an output scan in reverse just remove the negative sign from Vdstep and VgStep.

Let me know if it works for you