On Monday 18 December 2023, Adrian Godwin <
artgodwin@...> wrote:
> On Mon, Dec 18, 2023 at 9:55?PM Chris Hayes <
krizhz@...> wrote:
>>
>> Hi Adrian, good to hear from you... especially as you are local.
>> Maybe we need to start with a portable Voltage Standard. I made a 5 Volt ref in a box some time back but have not checked it's tempco yet. It is about 20mm thick, so it might go as a large letter.?
>
> Sounds interesting. I have a few LM399s but not done the work to make a transfer standard. But it would be very good to get a UK cal group together, for both DC and the stuff Reg is talking about.
> ?
>>
>> Does your HP53310A use the vanishing carrier technique? I used to enjoy doing that manually while working at Cossor Electronics in Harlow.
>
> No, it's a very high speed counter that measures the carrier frequency at modulation speed (and then displays a graph of frequency against time with min/max measurements). So it's an absolute measurement of frequency change rather than a calibrated demodulator (or, I guess, a mathematical technique as I imagine the vanishing carrier to be).
>
The Time Interval Analyser has other tricks up its sleeve, e.g. measuring subnanosecond risetimes.
In Brizzle, I have a small selection of resistance standards that are meant to be in oil baths, a couple of Sullivan mica capacitors, a well aged Trancell II transfer voltage reference, a Cropico voltage standard, an in-spec Weston standard cell thermometer (sic), a Julie Labs 7decade KVD.
I wonder if there is scope for a big meeting somewhere central, rather than trusting items to the post?
