RCS 401 counter timer

[ppppenguin]

This little counter/timer has come my way. With nice glowing nixies.

It lights up but I haven't tried it out yet.

Does anyone have any info on it. For once GIYF doesn't seem to work.

[pamphonica]

Sorry, no info, but I have the 520MHz version. It's lovely seeing half a gig displayed on glowing nixies.
Jeremy

[Alistair D]

http://www.americanradiohistory.com/Arch...976-07.pdf


Scroll down to the bottom of page 11 for an advert that gives some basic info.

A long time ago I had a 301. The folded paper handbook that came with it did have a copy of the schematic attached.

Al

[ppppenguin]

Well spotted Alistair. I've attached a clip from that page.

There seems to be remarkably little online about this company. Looks like quite a high quality unit, with oven controlled reference.

[Alistair D]

They were budget priced instruments but were well enough made and worked to spec.

One weakness(on the 301 anyway) was the input overload protection. This  consisted of 2 back to back signal diodes connected  directly across the input. Connect it to a source of over 1V that could supply a bit of oomph and the diodes went S/C.

On mine ISTR adding some series resistance and capacitance before the diodes. 

Al