IRIG Time Display

[Marcel Enguerra]

I currently have an ActiveX text display that's being populated with an IRIG time parameter that has the CurrentTimeOfYear() equation. This works fine for live data, but I would like the IRIG display to also display past times that are being fed from a chapter 10 playback. Is there a way to do this?

[Kathy Rodittis]

Hi Marcel-

What are the “past times” you are looking to see?  CurrentTimeOfYear will still work in a post-test environment. Do you mean you would like to scroll back and see that time updated?  Or do you mean there are other parameters that represent time words?

In the  ActiveX control list, if you select the IRIGClock, you can drop in different types of time words and see those times displayed. Like that?

-Kathy

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[Marcel Enguerra]

So I've got IRIG time from the time the recording was actually created, which I can see in the recorder and on my Vista decom. When I play back a file, the display still uses the current time from the dashboard instead of updating with the IRIG time in the chapter 10.

[Kathy Rodittis]

Dashboard time is the “current time” to IADS.

What is decoding the Chapter 10 data into IADS data?

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[James Bretz]

I'll step in with some comments. I hope this doesn't confuse the issue.

When the window is scrolling data in playback (i.e. the data is being displayed using automatically progressing time as it did in the realtime mission), the both the dashboard time and the irig time display should theoretically match, unless I missed something and you're referring to some internal time source not used to stamp the data.

For context, in playback mode, the time update on the dashboard is simply generated from an internal timer that 'simulates' time moving from the start of the mission to the end (i.e. as it was stamped from the acquisition system). Let me emphasize that the progression of the time is simulated based on the PC clock, but values match what was acquired. This is mainly for display purposes and not particularly for analysis. Adding some level of control, but still not entirely analysis centric, if you hit the "Irig Time" button on the dashboard you can set this playback time using VCR like fast forward, rewind, etc buttons. Alternatively, you can just ignore this progressing simulated time and grab the scrollbar on any window to browse through the data from start to end. Additionally, you can right click on the scrollbar and jump to a specific time. Having said all of this, the primary usage in playback mode would probably be to jump directly to some event that occurred during the mission and was recorded in the tool. To do this, you can bring up the most any log and jump directly to the event of interest by selecting the row and then the toolbar button "Goto Time" (clock icon).

I hope this helps,

Jim

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[Marcel Enguerra]

Kathy, I'm using Vista 4.10 to decode the data. I have the timecode module set to Decode and Generate. 

James, during a playback, should the dashboard time match the time that the data was recorded? Or will it only ever show the current PC time? The dashboard and IRIG time displays both match, they're just not showing the time that the data was actually recorded. We don't always create IADS logs for some tests and it's a little tough to jump to different times in the event when the actual IRIG time from the test isn't showing. 

[James Bretz]

>during a playback, should the dashboard time match the time that the data was recorded? 

Yes. It should match the time that the data was recorded, but the setup of that time could be incorrect.

>Or will it only ever show the current PC time?

No, it won't normally show PC time, unless of course somehow the PC clock was used to record the data. The playback client only uses the PC clock to simulate the advancement of time. Bottom line: The time on the dashboard should play from the start of data recording (however that data was timestamped) to the end of the data recording at wall clock speed.

> The dashboard and IRIG time displays both match, they're just not showing the time that the data was actually recorded. We don't always create IADS logs for some tests and it's a little tough to jump to different times in the event when the actual IRIG time from the test isn't showing. 

Roger that. Unless I'm misunderstanding, It sounds like the time source for your recording is incorrectly configured

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[Kathy Rodittis]

As Jim pointed out, IADS gets its time from the upstream source that is decoding the Chapter 10 data. So it would never display “PC wall clock” time unless that’s what Vista is sending it.

As I recall at one point Vista did involve its physical decoms with Chapter 10 processing so I would go check that part of the setup.  It sounds like the TCG on the decom is generating “current time”. Maybe?

IADS has it’s own Chapter 10 processing so if you have the right licensing you can use IADS to decode the Chapter 10 file without Vista. The way to check is to launch RtStation and look for “IRIG 106 Chapter 10 File” in the data source list.

You can get a temporary license if doesn’t appear and you’re interesting in trying that approach.

-Kathy

 

From: ia...@googlegroups.com <ia...@googlegroups.com> On Behalf Of James Bretz
Sent: Tuesday, August 3, 2021 8:12 AM
To: ia...@googlegroups.com
Subject: Re: [IADS] IRIG Time Display

 

>during a playback, should the dashboard time match the time that the data was recorded? 

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