Deactivation of tools (e.g. in loops)

Using SweepMe!
1

Hi,

I came across an issue regarding the loop module. If I want to measure a Dark current manually (which I need to do for longer measurements, as the dark current shifts over time), then I run into an Issue within SweepMe!.

The Tree looks something like this:

Capture
Capture399Ă—272 5.09 KB

If I perform this routine, the second (and further) dark measurement(s) capture the spectrum while the SMU is still on. My fix was to add a SMU (applying 0V) above the dark current measurement. Is there a better way, as I would like to have the SMU turned off or did I do something wrong?

Best,
Matthias Hofinger

1 Like
2

Hi Matthias,

if you need controlled conditions, there is nothing wrong with using an SMU module to set V=0 (short circuit) or I=0 (open circuit) and acquiring dark current in that branch (i.e. nested, not afterwards).

However, even without that “apply-zero” module, SweepMe! sends an output off command to the SMU when it is not in the currently active branch.

Which versions of SweepMe! and the SMU driver are you using?
To investigate what’s happening you could test a minimal example like the following:
Sequencer - minimal example
In the first branch (SMU1) a voltage of 1V is applied for a couple of seconds, and in the second branch (Hold) the SMU should have received the output off command (and thus switched “off”).

Best regards
Felix

Here’s the setting for copy & paste into the sequencer:

{
  "child_items": [
    {
      "child_items": [
        {
          "child_items": [
            {
              "child_items": [],
              "is_checked": true,
              "is_expanded": true,
              "module_details": {
                "module_type": "SMU",
                "Label": "SMU1",
                "value": "",
                "Device": "SMU-Keithley_2450",
                "Channel": "",
                "Port": "",
                "SweepValue": "SweepEditor",
                "SweepMode": "Voltage in V",
                "RouteOut": "Front",
                "4wire": false,
                "Compliance": "0.0001",
                "SkipCompliance": false,
                "Speed": "Fast",
                "Range": "Auto",
                "RangeVoltage": "Auto",
                "Average": "1",
                "Parameters": {},
                "Configuration": "",
                "PostProcessingResistance": false,
                "PostProcessingConductance": false,
                "PostProcessingPower": false,
                "ShowPulse": false,
                "CheckPulse": false,
                "PulseCount": "1",
                "PulseOffLevel": "0",
                "PulseOnTime": "200e-6",
                "PulseOffTime": "200e-3",
                "PulsePeriod": "1e-3",
                "PulseDelay": "0.0",
                "PulseMeasStart": 50,
                "PulseMeasTime": 30,
                "PulseRiseTime": "100e-9",
                "PulseFallTime": "100e-9",
                "PulseImpedance": "200e-3",
                "SweepEditor": {
                  "sweeps": [
                    {
                      "loop": "1",
                      "start": "1.0",
                      "end": "1.0",
                      "step_points": "0.1",
                      "scaling": "Step width",
                      "hold": "5.0"
                    }
                  ]
                },
                "ListSweepCheck": false,
                "ListSweepType": "Sweep",
                "ListSweepStart": "0.0",
                "ListSweepEnd": "1.0",
                "ListSweepStepPointsType": "Step width:",
                "ListSweepStepPointsValue": "0.1",
                "ListSweepDual": false,
                "ListSweepCustomValues": "",
                "ListSweepHoldtime": "0.1",
                "ListSweepDelaytime": "0.1",
                "Comment": ""
              }
            },
            {
              "child_items": [],
              "is_checked": true,
              "is_expanded": true,
              "module_details": {
                "module_type": "Hold",
                "Label": "Hold",
                "value": "5",
                "Comment": ""
              }
            }
          ],
          "is_checked": true,
          "is_expanded": true,
          "module_details": {
            "module_type": "Loop",
            "Label": "Loop",
            "value": "4",
            "Repetitions": "4",
            "UseReduction": false,
            "MaxPoints": 10000,
            "Reduction": "Quadratic",
            "KeepLastPoints": 10,
            "Comment": ""
          }
        }
      ],
      "is_checked": true,
      "is_expanded": true,
      "module_details": {
        "module_type": "MakeFile",
        "Label": "MakeFile",
        "value": "ID",
        "FileID": "ID",
        "ShowAdvancedOptions": false,
        "BranchIndex": true,
        "FileIndex": true,
        "ModuleLabels": true,
        "Comment": ""
      }
    }
  ],
  "data_type": "Sequencer",
  "version": "v1",
  "sweepme_version": "1.5.8.4"
}
1 Like