Corby wrote: "I'm not saying other tubes dont have glass but HP tubes DO
NOT."
On what authority? That statement is categorically incorrect.
To set the record straight I worked for HP and Agilent since 1977 as a
technician on the 5061 and later worked on the introduction of the 5071A
with the
Hal Murray wrote:
[variac]
If you don't have one, you can wire a light bulb in series with the
power cord. Use 40,60,100 watt - whatever you need.
Neat. Thanks. That trick wasn't on my list.
I think you can get lower wattage bulbs (at 120V). I think I've seen 25W,
but I'm not su
As a kid I had an outlet in series with a screw-in bulb, with a switch
across it to get full voltage. Used it very often.
73, Bob, k1REM
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com]on
Behalf Of Hal Murray
Sent: Thursday, September 10, 2009 1
Hi,
I use a Variac routinely to turn on instruments that have been unused
for more than a few months.
Electrolytic capacitors will often come good if slowly brought up to
voltage.
Recently I resurrected a WW2 "Command" receiver that had been stored
for 40 years.
I hooked up a power supply an
[variac]
> If you don't have one, you can wire a light bulb in series with the
> power cord. Use 40,60,100 watt - whatever you need.
Neat. Thanks. That trick wasn't on my list.
I think you can get lower wattage bulbs (at 120V). I think I've seen 25W,
but I'm not sure. Old style tungsten ni
Probably 90% of power supply overload problems are shorted dipped tantalum
caps. Start there... check the resistance across each supply. The other 90%
are shorted pass transistors/base drivers and/or zener diodes.
You mentioned that you have more than one of these units. Compare reading
So, so sorry -- After my last post reply, I forgot to get rid of the
following posts -- I hate it when that happens!
Dick Moore
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/tim
Hi, Brent and Doug -- my copy of the 5328 schematic shows a 0.47 ohm
resistor in series with F1, a 2A fast-blo fuse. I would be sure that
the current is flowing thru the fuse -- is it F1 on the P.S. board
that's blowing?. As Brent said, using a Variac and then putting an AC
ammeter across t
Hi Dave,
I think we've all lost some hair while working on a stubborn problem.
Hang in there.
As mentioned by Brent Gordon, the Variac is your friend in situations
like this. If you don't have one, you can wire a light bulb in series
with the power cord. Use 40,60,100 watt - whatever you need. Th
I'm not familiar with this particular instrument, but a standard
technique for linear power supplies is to hook it up to a variac. This
lets you turn down the line voltage so you can do some measurements
without smoking the system.
Brent
Douglas Wire - PUPCo Studios wrote:
Good day everyone an
Farmers around here use GPS guided equipment to guide their farm equipment. It
is possible to put fertilizer in one inch strips around the field and later go
back and plant in the same strip. Some use a reference transponder to increase
accuracy. Others seem to be able to use references on ne
So, I have been running a FreeBSD GPS disciplined NTP server for some time.
While there is a lot of guidance out there about how to do-it-yourself with
a Garmin LVC 18 and FreeBSD, I was unable to find any quantitative data
about whether the PPS was best handled in the FreeBSD kernel or in the ntp
I have a geodetic grade Ashtech Z12 GPS receiver and antenna. You collect data
with it (both L1 and L2 carrier phase) and email the data to the National
Geodetic Survey OPUS processing system. They crunch the numbers and come back
with a location (it's free).
The location is calculated by cr
In a message dated 09/09/2009 22:25:22 GMT Daylight Time,
dave.g0...@tiscali.co.uk writes:
How do you KNOW your position to such accuracy? Is it in fact possible
> to survey your position to that accuracy by any independent means?
>
> If, for example, you use official survey marks to deter
Murray Greenman wrote:
Mark,
How do you KNOW your position to such accuracy? Is it in fact possible
to survey your position to that accuracy by any independent means?
If, for example, you use official survey marks to determine your
position by direct measurement, are the survey marks really that
Neither the linear regulators nor the switching regulators in the 5328A have
any explicit current limiting circuitry other than that provided by the
pass transistor current gain and the limited current available from the
pass element driver.
The only protection against long term load faults is pro
"The HP tubes used a heated metal "burst" diaphragm not glass ampoules
to"
Dave,
Actually, YES.
I dug up the oven I had opened up and it is as I remembered.
The cesium ampoule is all metal and sits upside down in the center of the
"wicking" screen.
The center of the burst diaphragm is welded t
I'm not familiar with this particular instrument, but a standard
technique for linear power supplies is to hook it up to a variac. This
lets you turn down the line voltage so you can do some measurements
without smoking the system.
Brent
Douglas Wire - PUPCo Studios wrote:
> Good day everyone and
Mark,
How do you KNOW your position to such accuracy? Is it in fact possible
to survey your position to that accuracy by any independent means?
If, for example, you use official survey marks to determine your
position by direct measurement, are the survey marks really that
accurate?
Murray
Douglas,
there are lots of folks out there that are much more familiar with the
5328A, but here is what I think about it at a first glance.
If F1 blows quickly, there is a serious overload / short situation.
Don't try fixing by swapping fuses.
If you can't measure a short (that would be the firs
Good day everyone and thank you all for hosting this wonderful community
and allowing me to participate. I have several HP5328 with the “really-
nice” newer 10811-x Oscillators in them. I have found while I have
used the good old gold trace reliable HP instruments all of my life, these
units ha
I completed a 48 hour survey on a Thunderbolt with that Leica L1 choke ring
antenna. Might just be luck of the draw, but lat and lon were under 1 inch
error. Alt was off by 1.25 feet. I'm impressed...
The Leica AT303 L1/L2 choke ring antenna was around 5 inches error lat/lon, 1
foot alt
Sorry, it is a 5373A!It is not mine.
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com]on
Behalf Of Francesco Ledda
Sent: Wednesday, September 09, 2009 10:50 AM
To: Discussion of precise time and frequency measurement
Subject: [time-nuts] HP 8753A on Ex
Chuck,
Sorry to hear you're closing down, after all these years. Drop me a line
some time and we can talk.
Dave Carlson
(formerly HP, then Agilent)
- Original Message -
From:
To:
Sent: Tuesday, September 08, 2009 19:38
Subject: [time-nuts] HP 5061 chassis parts
As some of you alrea
Corby,
"The HP tubes used a heated metal "burst" diaphragm not glass ampoules to"
Actually, no. Glass ampoule inside the oven, surrounded by the wicking
material. Last step in the process of starting up a new tube is to use a
metal pin fired into the glass ampoule, similar to firing a small car
Tittle says it all.
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
> That's an interesting answer. Can you explain what you mean by
> "faster digital noise analysis capabilities"?
The 3048A is relatively cumbersome to use, compared to a modern phase-noise
test set with high dynamic range ADCs. Conceptually, a software radio with
multiple ADC channels
You can get it from our anonymous svn repo by doing this:
svn co https://ettus.devguard.com/svn/public
Matt
On Wed, Sep 2, 2009 at 12:27 AM, Chad Simpson wrote:
> Matt, I would be very interested in the python code. I got a good deal on
> the E2050A, and though I haven't set it up yet, I ima
28 matches
Mail list logo
