Seco Travese Kit

> I wonder where the height value is referenced to for a 196mm Seco Traverse Kit. I would not think it is referenced to tripod head plane. I am asking this so I'll know how the HI is derived using the 2m Seco height pin. I can also make height equation relating Leica and Seco traverse kits if I wish to use the Leica TS height meter for Seco travese kit.

I notice this question went unanswered in your prior thread on the comparison between this and the Leica kit. Unless I'm mis-informed, there is no magic to measuring the HI and HR. Except for very steep shots, the HI is measured to the centerline of the telescope; the HR to the centerline of the prism. If they're set up on tripods at the same height, you'll be very close to the same heights. The important thing is the RELATIVE height of each.

I have used these, there is a lever that spins out to measure height that equals the bottom notch of a Trimble instrument.

If you are using Leica I think they use a meter that hooks onto a leg of the tribrach. It would be quick to test comparability if you have a Leica tribrach. Or you could send Second a message and ask, they're rather knowledgeable about interchangeability. It's what they do...

I didn't get any favorable response yet from Seco at this point. For the time being, I need to learn from actual users.

In my opinion, heigth equation can be derived for as long as the Seco traverse kit height reference plane is known and physically measurable. Leica prism height equation is referenced to a distance parallel to carrier's longitudinal axis measured from the interface plane between the carrier and tribrach way up to the carrier's stub collar plane. If seco reference planes are known then the height equation can be derived and encoded into the data collection system.

Then you should be able to use the Trimble-compatible bottom notch hook that comes on them.

See page 96 & 146:

Trimble S6 User's Guide

Thank you so much!

be advised that the leica height hook does not work with every tripod; if the head of the tripod is too big, the hook does not attach properly.
if the height hook fits the tripod head, then it is a very good system. just a warning

That's one reason why I like the Trimble bottom notch. Rather foolproof, even if you have to reduce to true vertical on the fly.