Hi,
Thanks for the info.
I did’nt find how to find you paper in ko4bb.com
Thanks for pointing.
Best,
Gilles.
Envoyé de mon iPad
> Le 23 juil. 2019 à 13:01, Charles Steinmetz a écrit :
>
> Rick wrote:
>
>> Basically, no counter that we ever made AFAIK had
>> any provision for EFC.
>
> The
IIRC the internal transfer price was $400.
The whole "business model" of being a captive supplier
was extremely messy, including the calculation of
internal transfer price. For T instruments for
internal consumption, they abandoned "transfer at
cost" decades ago.
This was probably one of the
C12 and C15 on the support board are for peaking the multiplier/amplifier
for the external standard input. The unit accepts 1MHz, 5MHz or 10MHz for
the external reference frequency. The capacitors tune the external input to
10MHz for the counter to use as the reference.
Cheers,
Dave M
Hi
The “most often mentioned” run rate was “about 800 a month". It was never at
all clear
if that also came out to 10,000 a year or not. ( = how often did they hit that
rate).
If you wanted to buy one piece, I believe the price was $800. At that price,
even 800 a
month would be pretty good
I
On 7/23/2019 9:09 AM, djl wrote:
Just visited site. 3million hits on
10811 manuals. We're that many made:-)?
IIRC it was something like 1,000 on a good
month. No way 3 million.
Rick
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On 2019-07-23 13:01, Charles Steinmetz wrote:
The later HP5328 "oscillator helper" boards have EFC pots for fine
tuning the timebase frequency. This includes the US military versions
that are so prevalent in the US. I have schematics showing this with
both the 10544 (support board
Just visited site. 3million hits on
10811 manuals. We're that many made:-)?
On 2019-07-23 05:01, Charles Steinmetz wrote:
Rick wrote:
Basically, no counter that we ever made AFAIK had
any provision for EFC.
The later HP5328 "oscillator helper" boards have EFC pots for fine
tuning the
The military contracts were very important for the counter product line.
I suspect that the EFC feature was required in order to bid. The
way things worked at HP, special features for the military were
basically walled off from the civilian market. The project manager
for the 5335A worked in
Rick wrote:
Basically, no counter that we ever made AFAIK had
any provision for EFC.
The later HP5328 "oscillator helper" boards have EFC pots for fine
tuning the timebase frequency. This includes the US military versions
that are so prevalent in the US. I have schematics showing this
Hi
*Assuming* that we’re talking about 4 to 6x10^-10, you should be able to do
better
than that with the piston trimmer. I’m in no way suggesting that it is *easy*
to do
better than that.
The bigger question is: how much value is there in doing better than that? What
is the
aging rate on
Hi Rick,
Curiously enough, 5335A is the only counter that I know of that produce
Slew-rate measures, which is trival to calculate from the rise-time (or
fall-time) and the voltage difference between the start and stop
triggers, but yet nobody seems to care for that measurement. At the same
time,
I have several 10811.
Pin 6 on the edge connector is EFC input, Pins 2, 4 and 5 are GND.
The HP Service Manual is out there on the web. It's worth a search.
One of my units spent several years on the shelf. I put it back in service
using a
Motorola UT+ GPS receiver and Brooks Shera regulator
I have found two HP10811s where the EFC did not work.
When I opened them if found a teflon insulated silver plated tubular rivet
with the resistor, varicap diode and the lead from the crystal threaded
through the hole, but they had not been soldered.
A touch of resin cored solder to the point and
Hi Perry, I worked in the HP frequency counter section in the 1980's
when the 5335A was developed. I was the project manager for the
5334B counter. Basically, no counter that we ever made AFAIK had
any provision for EFC. The basic concept is that you can get the
frequency close enough with the
Yo Bubba Dudes!,
I bought a HP 10811 from ebay for $36 and shipping.
I installed it in my HP 5335a counter. After running continuously for about 90
days it was down to about 4 to 6 parts in -10. I couldn't adjust it for
better accuracy as HP in their infinite and inscrutable wisdom provided a
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