[time-nuts] Inside a CTS 1960017 OCXO

Pete Lancashire pete at petelancashire.com
Mon Feb 29 08:53:52 EST 2016


Pretty much agree with Dave M. But just like HP, PDI had their basic
supplies and their 'low noise/ripple' models, and of course the model with
the heater for voltage stability. The one Dave is talking about has a temp
controlled voltage reference. The easiest way to tell is there is
a 'HEATER' light on the front panel.

I'll toss in a 3rd company, Kepco. So for me its PDI, Kepco, and a HP.

Sounds like I should finish that web page I started of the low noise/ripple
models from the three makes.



On Sun, Feb 28, 2016 at 7:25 PM, Dave M <dgminala at mediacombb.net> wrote:

> Pete Lancashire wrote:
>
>> ... I was using an HP lab supply>>>
>>
>> Model ? Age ?
>>
>> My bench has some pretty old HP's even Harrison Lab branded supplies.
>> I
>> have had to re-cap a few of them.
>> In a way it is almost a curse how reliable their supplies were. You
>> always got the V and I you wanted so one
>> never thought about the filtering getting worse over the years.
>>
>> Also HP had two variations of their bench supplies. The basic ones
>> and the low noise versions. When I need
>> to make measurement like this, I make sure I'm using one of the low
>> noise/ripple models.
>>
>>
> Adding my few cents' worth to the power supply ripple/noise thoughts, I've
> found that the old linear supplies by Power Designs Inc were among the
> best, at considerably lower cost than the HP/Harrison Labs units.
> Ripple/Noise in the low millivolts and high microvolts, 0.01 - 0.005%
> regulation and temperature stability in the neighborhood of 0.01%/degC were
> common.
> I have a couple on my bench, and they just keep on working.  They still
> pop up at auction frequently.
>
> Cheers,
> Dave M
>
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