Re: [time-nuts] Z3805A cooling requirements?

2012-12-24 Thread Mark Spencer
Volker et al.. I placed a small muffin fan near one of my Z3805's.   The modest air flow seems to have some affect on the units operation. I've collected some ADEV data as well but don't entirely trust it yet.  Amongst other issues I had a lengthy power failure at my residence four days ago

Re: [time-nuts] Z3805A cooling requirements?

2012-12-24 Thread Tom Van Baak
Hi Mark, I wouldn't place much emphasis on the Adev data for Tau's of less than 80 seconds. Actually, just the opposite; the ADEV at short tau is very close to correct. I've collected some ADEV data as well but don't entirely trust it yet. Right, it's the ADEV for longer tau that is

Re: [time-nuts] Questions about TAC frontend, and some measurements

2012-12-24 Thread Bruce Griffiths
Fabio Eboli wrote: Il 2012-12-23 07:42 Bruce Griffiths ha scritto: The classic TAC using current mode switching is similar to the attached circuit schematic. Bruce I tried to replicate the circuit you attached, the pic was low resolution so I tried to figure the values. This is the circuit

Re: [time-nuts] Questions about TAC frontend, and some measurements

2012-12-24 Thread Bruce Griffiths
Fabio Eboli wrote: Il 2012-12-23 11:36 Bruce Griffiths ha scritto: The simulation indicates that the TAC capacitor charging current is far from constant whilst charging. This is due to the use of saturated switches rather than current steering switches. The capacitor charging current is poorly

Re: [time-nuts] Z3805A cooling requirements?

2012-12-24 Thread Magnus Danielson
Hi, On 12/24/2012 06:47 PM, Tom Van Baak wrote: Hi Mark, I wouldn't place much emphasis on the Adev data for Tau's of less than 80 seconds. Actually, just the opposite; the ADEV at short tau is very close to correct. I've collected some ADEV data as well but don't entirely trust it yet.