[volt-nuts] Traveling Standards

[Bruce Griffiths]

Poul-Henning Kamp wrote:
> In message<4E57F240.8060105 at c-c-i.com>, Bob Smither writes:
>
>    
>>> range, I would not leave anything to chance -- and retrace (hysteresis)
>>> is always a matter of chance,
>>>        
> Wouldn't the "degaussing trick" Tektronix uses on the LTZ1000
> help here ?
>
>    
For that to work the chip temperature needs to be cycled.
This is easy to do with an LTZ1000 as the temperature setpoint can 
easily be modulated with an external signal.
With an LM399/LM199 cycling the chip temperature ina controlled manner 
is more difficult as suitable internal temperaure regulation circuit 
nodes arent acessible.
With a discrete zener modulating the chip temperature is easily achieved 
via an external heater.

Bruce