Easurement Rocess; Measurement Setup; Sync And Coordination; Start, Arm, And Trigger - VTI Instruments EX1401 User Manual

Object
Cold
Temperature
Sensor Reading
Over range
Trigger time
Dropped trigger
T
M
EASUREMENT
M S
EASUREMENT ETUP
When the driver session is initialized by the Initialize method, the driver session is reset, or after the
previous measurement is finished, the instrument is in the Idle state. While in the Idle state, the user
prepares for the next data acquisition by configuring the setup parameters. For more information,
please refer to IVILXISync standard API documentation

Sync and Coordination

The Sync interface controls how the EX1401 synchronizes its ADCs and its timestamp counter.
When a sync event occurs, all ADCs in the system are synchronized to each-other, and all data
timestamp counters are reset and, if using the System Timestamp Source, synchronized to the IEEE
1588 clock. If the Sync.CoordinationLine property is set to "LAN", all instruments in the driver
session will use LXI Lan Event messages to coordinate their trigger state machines, ensuring that
all arm and trigger events are shared between all instruments in the system.

Start, Arm, and Trigger

Properties in the Start, Arm, and Trigger interfaces configure the data acquisition gating condition
and timing. Start determines when the data acquisition starts and when the instrument is ready for
the next acquisition. All hardware configuration and filters settling should be completed before the
Start event in order to ensure valid data is acquired.

Sampling Parameters

The sampling parameters are specified by properties in Sampling interface. Sampling in the
Measurement interface configures parameters common to the entire system. Optionally, the user can
configure the parameters of individual input channels using the Channels interface (with some
restrictions).
EX1401 Instrument Drivers
Name String
Junction Reference Junction
timestamp_sec
timestamp_frac
Over-Range
Trigger Timestamp
Seconds
Trigger Timestamp
Fraction
timestamp_sec
timestamp_frac
Trigger Dropped
5-4: A D
ABLE DDITIONAL ATA
P
ROCESS
Value
The temperature of the CJC sensor, in the same
units as the channel data.
The seconds portion of the timestamp of the
first TC sample that this CJC measurement was
used to compute.
The fractional portion of the timestamp of the
first TC sample that this CJC measurement was
used to compute.
True when any overload status bit is set.
The trigger timestamp in seconds
The fraction portion of the trigger timestamp.
The timestamp of when the trigger would have
occurred.
The fraction portion.
The channel name of the lost trigger.
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