Hi
Ok, I got enough time to play a bit more with the 5370B today. Here's what I
found (all running on the internal standard):
If I take the gate time out to 1 second, the frequency display reads as it
should.
If I look at the standard deviation on various samples of period I get some
Mark Sims wrote:
99.95 ns is a typical number for the period reading at minimum gate time. Set
the gate time to 1 sec. My 5370A shows 99.999 999 9650 +/- 50 at 1 sec gate
time.
Measuring it's own time-base is expected to give value not exactly
on-beat. Internal cross-talk with the
Hi
Yes indeed, the period was measured with the two channels in the com mode and
the reference into one of them. I hadn't considered the trigger offset issues
and was expecting something sub-100 ps rather than 500 ps. Obviously I need to
spend some quality time with this beast. Now I gotta
Bob Camp wrote:
Hi
Yes indeed, the period was measured with the two channels in the com mode and
the reference
into one of them. I hadn't considered the trigger offset issues and was
expecting something
sub-100 ps rather than 500 ps. Obviously I need to spend some quality time
with this
Yes, I replace the standard HP fan with a MUCH quieter one. I get mine from
a local surplus shop. It is made by AAVID. it draws 120 mA at 12V and I run
it off the 10V supply (which is somewhat over 10V).
I don't have one handy to get the part number. They also have a 160 mA model
At 4:10 PM + 3/10/10, Mark Sims wrote:
Yes, I replace the standard HP fan with a MUCH quieter one. I get
mine from a local surplus shop. It is made by AAVID. it draws 120
mA at 12V and I run it off the 10V supply (which is somewhat over
10V).
Before getting all whiny about
-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Magnus Danielson
Sent: Wednesday, March 10, 2010 7:48 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] 5370A vs 5370B
Bob Camp wrote:
Hi
Yes indeed, the period was measured with the two
Ed Palmer wrote:
One trick I always use to quiet down a rowdy fan is to replace the
mounting screws with rubber mounts. This isolates the fan's mechanical
vibrations from the chassis. The difference is audible - even with a
good fan. I salvaged some mounts from IBM machines that work
Subject: Re: [time-nuts] 5370A vs 5370B
Ed Palmer wrote:
One trick I always use to quiet down a rowdy fan is to replace the
mounting screws with rubber mounts. This isolates the fan's mechanical
vibrations from the chassis. The difference is audible - even with a
good fan. I salvaged some
back to the original issue front panel
One thing I have had success with is emailing some of the
bigger EBay instrument sellers and asking if they have
a parts unit. It helps of you are/were a regular customer.
I repaired a 3325A that needed some buttons, a bottom panel
etc. I asked and was
Bob Camp wrote:
Hi
Fanless Atom motherboard / solid state disk / wall wart power supply ... DVD
is still the main source of noise.
This was far from that. It is a AMD PHENOM II X4 90SE 2,5GHz CPU with 8
SAMSUNG ECOGREEN F2 1,5TB SATA disks is certainly not tailored in such a
fashion. The
I don't think thats true.
There would be a lot of common parts so the question is what are you looking
for?
On Tue, Mar 9, 2010 at 7:47 AM, Bob Camp li...@rtty.us wrote:
Hi
So a parts donor 5370B is a donor for 5370B's and not so much for a 5370A.
Bob
On Mar 8, 2010, at 11:37 PM, Bruce
Hi
So a parts donor 5370B is a donor for 5370B's and not so much for a 5370A.
Bob
On Mar 8, 2010, at 11:37 PM, Bruce Griffiths wrote:
The input amplifiers also differ.
The linear input voltage range of the 5370B input amplifiers is greater than
that of the 5370A.
Bruce
Chuck Harris
Bob Camp wrote:
Hi
So a parts donor 5370B is a donor for 5370B's and not so much for a 5370A.
It should be decided on a board-for-board level. Several boards are just
the same, so it would be no problem.
Cheers,
Magnus
___
time-nuts mailing
: Tuesday, March 09, 2010 8:49 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] 5370A vs 5370B
I don't think thats true.
There would be a lot of common parts so the question is what are you looking
for?
On Tue, Mar 9, 2010 at 7:47 AM, Bob Camp li...@rtty.us wrote
-
From: Bob Camp li...@rtty.us
To: 'Discussion of precise time and frequency measurement'
time-nuts@febo.com
Sent: Tuesday, March 09, 2010 10:08 AM
Subject: Re: [time-nuts] 5370A vs 5370B
Hi
Ok, the rest of the story:
I picked up a 5370B for less than the price of the 10811 inside it. The
unit
time and frequency measurement
Subject: Re: [time-nuts] 5370A vs 5370B
Hi Bob: sounds as if it just had a hard bump, meaning that all the boards
and connectors need reseating. I had an Hp device with a tiny crack in a pc
trace on the motherboard, but by golly I found it. Hope the B doesn't prove
Bob Camp wrote:
Hi
I'm about 90% sure I'm going to hang on to the counter. It may wind up with
a bunch of fixed level inputs on it, but for the price - I'll live with
that. Other than the blow to the front panel it seems to be in ok shape.
If I do keep it, tearing it open and checking all the
:10 AM
Subject: Re: [time-nuts] 5370A vs 5370B
Hi
I'm about 90% sure I'm going to hang on to the counter. It may wind up
with
a bunch of fixed level inputs on it, but for the price - I'll live with
that. Other than the blow to the front panel it seems to be in ok shape.
If I do keep
time and frequency measurement
Subject: Re: [time-nuts] 5370A vs 5370B
shucks, you can always get out the good ol' dremel and score some grooves in
the broken pots-then use a screwdriver...
Don
- Original Message -
From: Bob Camp li...@rtty.us
To: 'Discussion of precise time and frequency
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] 5370A vs 5370B
Bob Camp wrote:
Hi
I'm about 90% sure I'm going to hang on to the counter. It may wind up
with
a bunch of fixed level inputs on it, but for the price - I'll live with
that. Other than the blow
I've had the pleasure of fixing way too many 5370A and 5370B front panels.
It's been a while so these musings may be clouded... also beware of the two
or three different front panel designs. Also there are hybrid 5370A's out
there with 5370B front ends.
There are 4 pots on the front
considerably and could sell the upgrade to all of us
with 5370's. I would not be surprised if a PIC could do the task. . .
Demian
Date: Tue, 9 Mar 2010 16:56:41 -0500
From: Bob Camp li...@rtty.us
Subject: Re: [time-nuts] 5370A vs 5370B
To: 'Discussion of precise time and frequency measurement
Hi
One of the trigger level pots is stuck at the 2 V end of it's travel. That's
making checking things a little difficult.
The 5345 inputs were pretty easy to blow as I recall.
Bob
On Mar 9, 2010, at 7:03 PM, Mark Sims wrote:
I've had the pleasure of fixing way too many 5370A and 5370B
to all of us
with 5370's. I would not be surprised if a PIC could do the task. . .
Demian
Date: Tue, 9 Mar 2010 16:56:41 -0500
From: Bob Campli...@rtty.us
Subject: Re: [time-nuts] 5370A vs 5370B
To: 'Discussion of precise time and frequency measurement'
time-nuts@febo.com
Message
The display rate pots is particularly useless. You can just
hardwire it to max.
The only case I've seen where that's an issue is when using the counter over
GPIB, free running in talk-only mode. If I run it with the Prologix
Ethernet adapter, which turns each reading into its own TCP/IP
Hi
Ok, the trigger level pots are bent but functional. The one that was stuck
works after a bit of readjustment of the knob.
All three inputs (ext arm, and the two channels) blink when I put the 10 MHz
into them. The two with the working pots behave as expected as the pot is
turned (trigger
Bob how long has it been on
I think it needs to be stable like about 30 minutes
On Tue, Mar 9, 2010 at 8:37 PM, Bob Camp li...@rtty.us wrote:
Hi
Ok, the trigger level pots are bent but functional. The one that was stuck
works after a bit of readjustment of the knob.
All three inputs (ext
I think it has to warm up for about 30 minutes
Seem to recall interpolators maybe not just seems like that
On Tue, Mar 9, 2010 at 8:37 PM, Bob Camp li...@rtty.us wrote:
Hi
Ok, the trigger level pots are bent but functional. The one that was stuck
works after a bit of readjustment of the
Hi
I didn't leave it on for very long. IIt would not surprise me if there's some
drift that's occurred. It was last calibrated in 2006.
Bob
On Mar 9, 2010, at 8:48 PM, paul swed wrote:
Bob how long has it been on
I think it needs to be stable like about 30 minutes
On Tue, Mar 9, 2010 at
If you are using the internal oven give it time
The old brain says there may have been another circuit that also needed
time.
On Tue, Mar 9, 2010 at 8:52 PM, Bob Camp li...@rtty.us wrote:
Hi
I didn't leave it on for very long. IIt would not surprise me if there's
some drift that's occurred.
00:03:04 +
From: Mark Sims hol...@hotmail.com
Subject: [time-nuts] 5370A vs 5370B
To: time-nuts@febo.com
Message-ID: blu125-w25460fafb6ba00b5258f2ce...@phx.gbl
Content-Type: text/plain; charset=iso-8859-1
I've had the pleasure of fixing way too many 5370A and 5370B front panels.
It's been
] 5370A vs 5370B
I think it has to warm up for about 30 minutes
Seem to recall interpolators maybe not just seems like that
On Tue, Mar 9, 2010 at 8:37 PM, Bob Camp li...@rtty.us wrote:
Hi
Ok, the trigger level pots are bent but functional. The one
that was stuck
works after a bit
Hi
Well I popped the top off of the beast. As far as I can tell, everything is
there and there are no big burn marks on any of the boards. Judging from the
edges of the cards, they have not been out of their sockets very often.
The alignment procedure in the manual is pretty straightforward
By god I thought it had interpolators.
Good to stay clear of them
That said let the whole thing warm up.
Maybe an hour even. See if your numbers don't come closer when reading the
internal oscillator to itself. If its good then leave the interpolators
alone.
On Tue, Mar 9, 2010 at 10:27 PM, Bob
99.95 ns is a typical number for the period reading at minimum gate time. Set
the gate time to 1 sec. My 5370A shows 99.999 999 9650 +/- 50 at 1 sec gate
time.
From my experience it can take at least a couple of months of continuous
operation for the oscillator in an unused 5370 to
with chip. I don't know if the 5370B
would be as easy to substitute.
-Demian
Date: Wed, 10 Mar 2010 00:03:04 +
From: Mark Sims hol...@hotmail.com
Subject: [time-nuts] 5370A vs 5370B
To: time-nuts@febo.com
Message-ID: blu125-w25460fafb6ba00b5258f2ce...@phx.gbl
Content
To: time-nuts@febo.com
Subject: [time-nuts] 5370A vs 5370B
99.95 ns is a typical number for the period reading at minimum gate time. Set
the gate time to 1 sec. My 5370A shows 99.999 999 9650 +/- 50 at 1 sec gate
time.
From my experience it can take at least a couple of months of continuous
my gosh, put on a nice external 10 mhz reference like from your standard
and test against itself :-)
Bob Camp
Hi
Well I popped the top off of the beast. As far as I can tell, everything
is there and there are no big burn marks on any of the boards. Judging
from the edges of the cards, they
Bob,
I think you'll find that the test mode you're describing results from
is setup using A as start B as stop and the period measurement
is for 1 period.
The resulting 99.x reading has rather wide limits since both channel
trigger level uncertainties are included in the measurement. Unless
you
On 3/9/2010 10:09 PM, John Allen j...@pcsupportsolutions.com
wrote:
Hi Mark - do you have a source or part number for the fan? I seem to remember
that the manuals says 35 or 37 cfm.
Without a pressure drop, cfm is is not sufficient to find an adequate fan.
I can put a 5370A/B on a flow
Hi
How much of the 5370A was directly carried over into the 5370B?
Bob
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The input amplifiers also differ.
The linear input voltage range of the 5370B input amplifiers is greater
than that of the 5370A.
Bruce
Chuck Harris wrote:
Front panel, chassis, motherboard, and power supply appear to be the
same.
The CPU, ROM, and RAM boards were made into a single board.
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