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Publication No. 980938 Rev. K
Model T940 User Manual
Astronics Test Systems
Soft Front Panel Operation 5-63
The relevant VXI
plug&play
API functions are:
•
tat964_setChannelSenseParameters
•
tat964_setChannelLoadState
Channel Connect
This control allows the user to control the isolation and analog bypass relays.
The selections for this pull-down control are:
Table 5-63: Channel Connect Settings
Setting
Description
Open
Isolation and Analog Bypass Relay Open
Closed
Isolation Closed, Analog Bypass Open
Analog
Bypass
Isolation Open, Analog Bypass Closed
Note: DR2 and DR7 Driver/Receiver boards do not have relay isolation. DR9 is
the only Driver/Receiver board with the analog bypass relay.
The relevant VXI
plug&play
API function is:
•
tat964_setChannelConnect
Hybrid Connect
This control allows the user to connect any of the I/O channels to a pin on the
front panel called EXTFORCE.
Note: Despite being called EXTFORCE, it may be used to drive or sense the
channel pin.
When the hybrid connection is turned "On" the driver is forced into high
impedance and the front panel "EXTFORCE" pin is connected to the channel.
There is a series resistance of ~40 ohms between EXTFORCE and the Channel.
Note: The Channel Connect relay also needs to be closed. Note: The bandwidth
is also limited to ~3 MHz.
When the hybrid connection is turned "Off" the driver is enabled and the front
panel "EXTFORCE" pin is disconnected from the channel.
The relevant VXI
plug&play
API function is:
•
tat964_setChannelHybridState
Comparator Delay
This allows the user to add delay to the comparator inputs for DR3e, DR9, and
UR14 front end channels.
The range for
Comparator Delay
is from -1 (bypass delay) to 31 (~19.35ns)
625ps per count.