Measurement Settings And Device Parameters - Ossila FACT1 User Manual

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Measurement settings and device parameters

This UI is used to specify the sweeps, the transistor features required to compute the mobility and to
programme and Bias/Lifetime acquisitions.
Acquisition settings: Output characteristics (IV), Gate
Use this UI subpanel to control the GATE SMU for IV acquisition
SMU Name is the alias name of the SMU unit as specified in MAX (Measurement & Automation
Explorer).
For Keithley series 26XX dual channel series, the SMU alias name must be KeithleyO, while for NI PXI
4132, the name is SMUA.
Important: These names are case sensitive, spell them correctly and pay attention to the correct
position of the lower and upper case letters, otherwise SuperFACT will not be able to recognise the
hardware and will return an error.
Channel is the SMU channel used for output/input operation. Input a for Keithley 26XX dual channel
and 0 for NI PXI 4132.
Auto Zero controls the Auto Zero functionality. If Auto Zero is enabled (ON), the SMU disconnects
the external load, shorts the internal measurement circuitry and measures the internal short. This
value is then subtracted to the load current so that the output current is given by
I = I - I
output Load Internal
Eq. 20
For an ideal SMU, the internal short current I
value is always different from zero and represents the internal current bias. This bias is responsible
for a (temperature and range-dependent) measurement error, which affects any measurement.
Auto Zero ring selector allows the user to choose among three options,
Off: no the correction is applied, i.e. I
Once: the internal current, I
session and its value is subtracted to I
On: the internal current is measured for any acquisition point and its value subtracted to the
corresponding I
Load
Ossila Ltd
should be zero. For a real SMU, however, this
Internal
= I
output Load
, is measured at the beginning of each measurement
Internal
according to Eq1.
Load
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