Ground balance algorithm?

[BarnacleBill]

From the DFX manual:

"The D.C. Phase of the ground has a relationship
to the proper Ground Balance setting."

and

"When considering specific numbers it is important
to know D.C. phase is provided by the 15 kHz
channel without normalization."

And from the Vision Field Guide:

[attachment 121168 VisionGndProbe.gif]

GB Questions:

1. If a single frequency is selected i.e.2.5kHz, and the Vision is GB'd, is the GB optimized for 2.5kHz?
2. If the above is true, and you change to another frequency will you be reminded to re-GB?
3. And once again if (1) is true and you change from 3 freq. to 1 freq. will you be reminded to re-GB?
4. And if you GB'd in 3 freq., is it like the DFX where only one of the frequencies is used to provide the D.C.? Or is there a correlation of 3 freq.s?

Freq. Select Clarification

It appears that you can either select a single freq., or 3 freq.s, but you cannot select any 2 combined freq.s. i.e. 2.5kHz & 7.5kHz___or___2.5kHz & 22.5kHz. Correct?


Thank You in Advance

 

[ak_1234]

1) Yes
2) You will not be reminded. It will go into its fast track mode for 20 seconds and then return back to the normal track speed that you have configured after that. You can always fast track whenever you wish though.
3) See 2
4) It's a combination of all 3 frequencies.
5) Correct - you cannot select 2 frequencies. Only single or all 3.

 

[on-edge]

good question,i think someone has already mentioned that there is normalization between the three frequencies and vdi #'s?
i'm wandering also how often a ground balance needs to be achieved?

 

[ron_c]

Wouldn't there be an advantage overall using all 3 frequencies instead of just 1?

 

[BarnacleBill]

Thank you for the answers.

For points 1, 2, & 3 I was thinking in terms that if you were not using auto-tracking, therefore operating the detector in manual GB mode. Therefore under those conditions, besides the detector possibly becoming unstable under certain ground conditions, is the operator notified of a possible problem on freq. change?

Or is there an automatic trigger of Auto-Tracking on frequency change? And if there is, does it track for a few seconds and return to locking back in manual, which was the GB mode of operation before freq. change?

HH
BarnacleBill

 

[ak_1234]

Gotcha. Not at this time. When you have lock track on, no ground balancing is done. You need to ground balance when changing frequency and/or gain.

 

[BarnacleBill]

Thanks for taking the time to clarify that!

 

[DELTA196]

1) Yes
2) You will not be reminded. It will go into its fast track mode for 20 seconds and then return back to the normal track speed that you have configured after that. You can always fast track whenever you wish though.
3) See 2
4) It's a combination of all 3 frequencies.
5) Correct - you cannot select 2 frequencies. Only single or all 3.

You can always fast track whenever you wish though.

How do you achieve this? Thanks.

 

[ak_1234]

2 ways:

1) press and hold enter on the track live control. Then bob your loop up and down until the change in audio is minimized.

-or-

2) While pulling the trigger (pinpoint mode) press and hold the enter button. Bob the detector as above. Be sure to release enter before releasing the trigger when done so that you don't lock yourself in pinpoint.

(If you want to lock your detector in pinpoint, pull the trigger, press enter and then release the trigger before the enter key).