[time-nuts] Parallel voltage regulators
donmer at woosh.co.nz
Fri Oct 26 02:05:55 EDT 2007
Surely there will be an improvement in oven temparature regulation, by using
a regulated supply, but whether or not this improvment is marginal or
significant would have to be determined either by experiment [my favourite],
or calculation. As you say Chuck : it`s eliminating [or reducing the effect
of] one variable in the equation.
----- Original Message -----
From: "Chuck Harris" <cfharris at erols.com>
To: "Discussion of precise time and frequency measurement"
<time-nuts at febo.com>
Sent: Friday, October 26, 2007 12:29 PM
Subject: Re: [time-nuts] Parallel voltage regulators
> ); SAEximRunCond expanded to false
> Errors-To: time-nuts-bounces+donmer=woosh.co.nz at febo.com RETRY
> The simple answer is if the heater supply in unregulated, and the
> supply changes, it will take a little while before the heater control
> loop can compensate. While this is happening, the oven temperature
> will be slightly wrong, and the crystal frequency will be offset.
> Voltage regulation adds one more level of isolation to the oven
> from changes in raw supply voltage.
> -Chuck Harris
> Matt Ettus wrote:
>> ); SAEximRunCond expanded to false
>> Errors-To: time-nuts-bounces+cfharris=erols.com at febo.com RETRY
>> This may be a bit late in this [strangely contentious] discussion, but
>> I have to ask why you need to regulate the heater voltage? If the
>> voltage varies, the control loops will adjust accordingly. Unless the
>> input voltage is higher than some safe range for the heater circuitry.
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