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Switch Control
Change the state of a switch by completing the following steps:
1.
Preset the new state of the switch by setting the
NI.FIU.Preset*
properties for each
physical channel
Channel_n
and
ChannelPair_n
. There is no limit to the number of
preset switch states that can be written, but subsequent writes to the same physical switch
will overwrite any previous values.
2.
After completing all preset writes, update the switch state with the
NI.FIU.Update
command.
3.
The device will transition the switch states in the following sequence, starting at t = 0 ms
upon execution of the
NI.FIU.Update
command.
t = 0.12 ms
Connect LOADs to DUTs
t = 0.32 ms
Disconnect DUTs from BusA/B and pair channels
t = 0.52 ms
Connect DUTs to BusA/B and pair channels
t = 0.72 ms
Disconnect LOADs from DUTs
4.
The current state of the switch can be confirmed by reading the
NI.FIU.State.*
properties.
Modifying the
NI.FIU.Preset*
properties will not change the state of the switch. A switch
transition on the pending preset values is only triggered upon execution of the
NI.FIU.Update
command. This allows concurrent switch operations in different physical
channels.
Calibration
The factory calibration values for each channel's gain and offset coefficients may be
overwritten by the user. NI recommends calibrating the board under the following conditions:
1.
Power on the module for at least one hour. Ensure that normal air flow is unblocked
around the SLSC chassis. Leave at least one switch closed during this time. Validate that
the switch is closed by reading back the
NI.FIU.State.*
properties, which ensures the
board is operating as expected.
2.
Use one of the below paths to calibrate the device:
•
DUTn to Bus A
•
DUTn to Bus B
•
DUTn to LOADn
3.
Close the chosen channel and provide a known DC current through that path.
SLSC-12251 and SLSC-12252 User Manual
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© National Instruments
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