[time-nuts] Vernier interpolation

[Tom Verbeure]

I bought myself an HP 5370A yesterday at the electronics flea market. Smoke
came out of it after plugging it in (which means I bought myself a good
amount of entertainment for just $40), but it made me study the dual
Vernier method of interpolation.

I understand how it works, but I've been wondering if this is a technique
that continues to be used or has the availability of fast and
high-precision ADCs resulted in it being replaced by the voltage slope
interpolation method that's used by the SR620?

According to the August 1978 edition of HP Journal, the 5370A is using a
custom hybrid with 5GHz transistors. I'm wondering if anyone has ever tried
making their own TI counter using the Vernier method? (TBH, I don't think
I've ever seen anyone build their own TI counter using slope interpolation,
but at least high precision ADCs are available on Digikey...)

Tom