Have 4 HP5360s and even the keyboard and interconnecting cable.
I did have to home brew a replacement Nixie assembly for one. (It was
missing)
I used orange/yellow 7 segment leds that matched the nixie filter very
nicely.
The same circuit produced an rs 2322 output. Way easier then the 1 MHz
Hi Hugh,
Enjoying your stories.
On 2019-01-21 01:57, Rice, Hugh (IPH Writing Systems) wrote:
Like all breakthrough measurements, the next 20+ years was spent refining the concept.
Better "front end" amplifiers, able to measure low amplitude signals. Faster
counters, that could capture
Hi,
I used an HP counter in 1961 that had these vertical strings of
neon tubes behind numbers, and the two least significant decimals were read off
two milliamp meters numbered 0 to 10. For each count the needles would point to
the
number to be read. The whole instrument was a 2 foot cube that
https://www.arl.wustl.edu/~jst/cse/260/glitchChaney.pdf
suggests metastability was noticed in the 1940's but not taken seriously for
decades thereafter.
Bruce
> On 21 January 2019 at 19:10 Hal Murray wrote:
>
>
>
> When did people designing counter/timers start paying attention to
>
Hi:
I think there were some versions prior to transistors. For example:
https://prc68.com/I/HPac4a.shtml
A friend of the family worked at HP and gave these to me.
--
Have Fun,
Brooke Clarke
https://www.PRC68.com
http://www.end2partygovernment.com/2012Issues.html
axioms:
1. The extent to which
When did people designing counter/timers start paying attention to
metastability?
I learned about it in the late 70s or early 80s. In the mid 80s, I went to a
trade show that had a panel on it, and one of the panelists actually claimed
it wasn't a problem.
--
These are my opinions. I
