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Configuring a digital trigger (start & stop)

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note: The event button will allow you to configure an analogue start or stop trigger.

In the example above, the "704 NWR" and "704 NWN" relays have been selected as the trigger start and end events. 

Configuring an analogue trigger (start & stop)  

• The type of trigger is selected by pressing "level" or "event" (in orange).

• The channel to trigger from and the trigger type is shown (in green).

• For analogue channels, the trigger threshold is set (pale green) and the trace direction (yellow).

• The "Pretrig" value is the time period (measured in milliseconds) specifying the pre-trigger time period.

Selecting the analogue channel to collect

The analogue channel to record is selected using the following display:

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The SA380 TX is capable of logging up to three analogue channels simultaneously in a capture if required. This could be used to capture motor current and hydraulic pressure simultaneously for example. Note: Centrix supports this, it is not supported by Network Rail's II platform for example.

Temperature Recording

An additional reading can be made at the start of the capture (as the start trigger fires) which is reported to the central server as the temperature at the time of the capture. Only one such channel can be recorded. This is set up as illustrated below:

Configuring Reverse Capture

The copy and reverse button can be used to create the capture for the reversed swing. It will bring up the created capture as illustrated.

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The start and end triggers have been generated automatically by the logger, and the capture channels copied. The "Group 1" button (orange) is used to allow logical grouping of captures. You should verify that these are correct before proceeding. Where multiple CTs are attached to a set of points it is possible that a different mimosa id is to be recorded for the R-N direction. The following illustrates this.

Updating Mimosa Id

With Centrix, the default channel Id for a capture is predefined to match the loggers physical channel, and it is not necessary to change it. However on the Network Rail II, it is necessary to make sure that N-R and R-N captures, even from physically different channels, are logged using the same mimosa offset. Capture channel offsets on the II sit in the range 64-127 (however the logger will not enforce this).

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