Ossila FACT1 User Manual page 91

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Close the file, restart SuperFACT and try to load a different experiment. If the problem
persists contact technical support at info@ossila.com.

SuperFACT opens, it performs the measurement cycle, the output is constituted by noise
current.
Possible causes for this are:
o Multiplexer toggle switch is OFF
Action Required: switch ON Multiplexer Measurement Unit
o The Lid of Multiplexer Measurement Unit is open; Device and Gate LED may be on
but no signal will be present on the probes in the substrate holder.
Action Required: Close the Lid, make sure that the Lid presses against the interlock
on the casing so that the relay is ON when the Lid is shut.
o Check the safety bits have been set; no Device or Gate LEDs will light up if the Safety
Bits have not been set.
Action Required: Set the Safety Bits. See
o The push-fit connector of the test board (inside Multiplexer Unit) is not present or
not properly fitted.
Action Required: Make sure that the push-fit connector is tightly arranged on the
top of the test board.
o The coaxial cables connecting the PXI-4321s SMUs with the Gate and Drain input of
the Multiplexer Unit (Channel A and B) are not properly connected.
Action Required: Switch OFF both PXIs or SMUs and check the connections. Make
sure that the Front Panel I/O PXI connectors (Backshell) are both tightly plugged to
the PXI receptacles, and that the "WARNING" label is on right side of the I/O PXI.
o Check the substrate has been inserted correctly. The Gates on the substrate should
be placed nearest to the Front Panel.
o Check the USB cable us connected from the socket of the National Instruments NI-
PXI-413 to the computer.
o If the problem persists, unplug the Backshell, use a screwdriver to remove the lids
and check if the Central Core (D in Figure 19) and the metallic shield (B in Figure 19)
of the coaxial cable are connected to the first and fourth pins inside the Backshell.
The pins are numbered from top to bottom, with the "WARNING" label of the
Backshell on the right side. Make sure that the Central Core and the metallic shield
are connected (through the Backshell) to the "High" and "Low" output for both SMU
channel. The output type of the SMU can be read directly on their front panels.
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