Re: [time-nuts] HP 5372A TIA Question

Hi Adam, OK, good to hear about the progress. Let us know about what you learn and if you need additional input. I'm curious what is the cause of this error. Cheers, Magnus On 06/03/2018 04:09 AM, Adam MacDonald wrote: > Thanks Gents, > I ran the additional tests recommended by Poul and Magnus

Re: [time-nuts] HP 5372A TIA Question

Thanks Gents, I ran the additional tests recommended by Poul and Magnus and I concur that the interpolator board is not the likely culprit.  I reversed the input cables as well as the pods in separate experiments to rule out those contributors with no different results.  I thought it may be a

Re: [time-nuts] HP 5372A TIA Question

On 5/31/2018 10:00 AM, "Poul-Henning Kamp" wrote: PS: I do not recall it being mentioned, but the 1 MOhm input pods are horribly unstable compared to the 50 Ohm input pods, which are basically just a stripline and a BNC connector. One thing to note about all the 5372A pods: They should

Re: [time-nuts] HP 5372A TIA Question

In message , Magnus D anielson writes: >Consider that you need to swap the cables to verify that it is static >with the setup and does not follow the cables. Run long series of measurements with the HP5372A OCXO free-running and with it slaved to the DUT clock. Any imperfection in the

Re: [time-nuts] HP 5372A TIA Question

Hi Adam, On 05/30/2018 12:26 AM, Adam MacDonald wrote: > Time Nuts, > I have a nice new-to-me 5372A that I'd like to use as part of a DMTD > stability analysis system.  After getting a few odd glitches from a very > stable source spaced 2 ns above or below the main time interval reading, OK,

[time-nuts] HP 5372A TIA Question

Time Nuts, I have a nice new-to-me 5372A that I'd like to use as part of a DMTD stability analysis system.  After getting a few odd glitches from a very stable source spaced 2 ns above or below the main time interval reading, I decided to run the performance verification checkout from the

Re: [time-nuts] HP 5372A

HI > On May 11, 2018, at 3:12 PM, Magnus Danielson > wrote: > > Hi Don, > > On 05/10/2018 02:59 PM, Don Murray via time-nuts wrote: >> Hi Magnus... >> >> >> Appreciate any help! >> >> I participate in the ARRL Frequency Measuring Test, >> and I would like to

Re: [time-nuts] HP 5372A

Hi Don, On 05/10/2018 02:59 PM, Don Murray via time-nuts wrote: > Hi Magnus... >   >   > Appreciate any help! >   > I participate in the ARRL Frequency Measuring Test, > and I would like to automate the measuring process. >   > I have two frequencies, A and B... >   > A is a GPS locked HP 3336B

Re: [time-nuts] HP 5372A

If want to exploit what the 5372A can do in FMT-context, you should feed it the amplified and band-pass filtered RF (rather than some down-converted and otherwise mangled version of the signal) and capture timing of the actual zero-crossings and post-process that. -- Poul-Henning Kamp

Re: [time-nuts] HP 5372A

When I was working at the Arecibo Observatory and we were running the ionospheric heater at 5.1 MHz (think Mini-HAARP), I'd sometimes go home (about 3 miles away) and listen to the signal there.There was frequently substantial random fading of the signal, suggesting that I was hearing the

Re: [time-nuts] HP 5372A

Hi Well, having actually run FMT virtually “in the back yard” of the transmitting station …. it’s surprising what 70 miles will do. In this case, back yard really does mean on the premises. There is a lot that gets into even fairly sort distance propagation. Bob > On May 11, 2018, at 1:52

Re: [time-nuts] HP 5372A

By the way, if you would like some data captured during the last run, let me know. I have an excel sheet of the peak data from spectrum lab centered on 1850hz as I use the 3586B receiver. Regards, Jerry Jerry Hancock je...@hanler.com (415) 215-3779 > On May 11, 2018, at 10:52 AM, Jerry

Re: [time-nuts] HP 5372A

If you were in Connie’s back yard or had a very stable ground wave, then yes, you could automate the testing. There are a number of challenges with this method as looking at the data with a simple graph will tell. You might have large fluctuations on the high frequency side only, for

Re: [time-nuts] HP 5372A

Hi Magnus...     Appreciate any help!   I participate in the ARRL Frequency Measuring Test, and I would like to automate the measuring process.   I have two frequencies, A and B...   A is a GPS locked HP 3336B set to 455,000.000 Hz   I use the 3336B instead of the 455,000Hz BFO signal from my GPS

Re: [time-nuts] HP 5372A

Hi, What issues do you have? Cheers, Magnus On 05/08/2018 02:32 AM, Don Murray via time-nuts wrote: > Hello Time Nuts... > > >   > Who is the resident expert on the HP5372A? >   > I have some operational questions.  ;-) >   > email off list please.  w4wj at aol.com >   > TNX all... >   > 73 >

[time-nuts] HP 5372A

Hello Time Nuts...   Who is the resident expert on the HP5372A?   I have some operational questions.  ;-)   email off list please.  w4wj at aol.com   TNX all...   73 Don W4WJ     ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

Re: [time-nuts] HP 5372A channel c option 030

In message , Bob Bownes writes: >While I had the 5372a apart today to replace the battery, I noticed >that there is an SMA for channel C on the events board and diagram >showing a cable from there to the front panel. > >This suggests to me

Re: [time-nuts] HP 5372A channel c option 030

Hi Bob, There is also the A20 board for the C-channel consisting on a series of attenuator, amplifiers/limiters and a divide by 4 before reaching that SMA connector. You then flip the option switching on the motherboard. I got the C-channel on mine, but you should be looking into

[time-nuts] HP 5372A channel c option 030

While I had the 5372a apart today to replace the battery, I noticed that there is an SMA for channel C on the events board and diagram showing a cable from there to the front panel. This suggests to me that the upgrade is a cable and a key, jumper, or memory setting. Anyone ever done the

Re: [time-nuts] HP 5372A troubleshooting

Adrian, Thanks very much! I had no idea those scans were available for the 5371A. I'll download them at once. Regards, Morris --- From: Adrian Morris, you might want to download the 5371A service manuals which contain schematics. The 5372A being an

[time-nuts] HP 5372A troubleshooting

Hi all, I have been on a steep learning curve on my new 5372A. It's a lovely instrument but does seem to have a higher degree of trigger jitter than I would expect. Going on previous experience with other unrelated instruments I began by checking the power supplies. (in fact it's hard to go much

Re: [time-nuts] HP 5372A troubleshooting

Morris, you might want to download the 5371A service manuals which contain schematics. The 5372A being an 'upgraded' version of the 5371A, most of its parts are identical. Look for 05371-90018 (Vol.1) and 05371-90034 (Vol.2). They should be available at www.keysight.com The scan quality is

Re: [time-nuts] HP 5372A advice

Thanks Gary, Thanks very much for your very helpful reply. I found those 2 operators manuals and downloaded them. The Keysight website is slightly confusing as those manuals were not in the same place as the others I found. I now have some great reading to catch up on!! Morris From: Gary

Re: [time-nuts] HP 5372A advice

The main feature in the '72 compared to '71 is the hardware accelerated histogram function. This allows you to do millions of histogram samples a second rather than being limited to the processor to do the calculations. The '72 have some more analysis modes. HP had this to offer:

Re: [time-nuts] HP 5372A advice

Hi Morris, On 01/20/2016 09:59 AM, Morris Odell wrote: Thanks very much for your reply Magnus, I strongly advice you to download the manuals. It is an instrument that is puzzling at times, so the manuals are needed. The upside is that they are really interesting. The operators and programming

Re: [time-nuts] HP 5372A advice

In message <569fde69.2020...@rubidium.dyndns.org>, Magnus Danielson writes: >Good, then I have not remembered completely wrong. The 5371 and 5373 manuals are not without relevance either, and don't overlook the app-notes and the HPJ (1989-02) articles either. -- Poul-Henning Kamp

Re: [time-nuts] HP 5372A advice

Has anyone published a summary of the differences between the '71 & '72? > On Jan 20, 2016, at 15:11, Poul-Henning Kamp wrote: > > > In message <569fde69.2020...@rubidium.dyndns.org>, Magnus Danielson writes: > >> Good, then I have not remembered completely

Re: [time-nuts] HP 5372A advice

On 01/20/2016 03:59 AM, Morris Odell wrote: Thanks very much for your reply Magnus, [...] I have downloaded what's there, unfortunately there's no operator's manual but I did the "Getting Started Guide" with the instrument. The prog manual might stimulate me to get GPIB up and running.

Re: [time-nuts] HP 5372A advice

Morris and Gary, On 01/20/2016 03:36 PM, Gary Chatters wrote: On 01/20/2016 03:59 AM, Morris Odell wrote: Thanks very much for your reply Magnus, [...] I have downloaded what's there, unfortunately there's no operator's manual but I did the "Getting Started Guide" with the instrument. The

Re: [time-nuts] HP 5372A advice

Thanks very much for your reply Magnus, > I strongly advice you to download the manuals. It is an instrument that > is puzzling at times, so the manuals are needed. The upside is that they > are really interesting. The operators and programming manuals get you > understand what it really does.

[time-nuts] HP 5372A advice

Hi all, I recently was fortunate enough to obtain one of these amazing instruments but regrettable no copy of the main operating manual. I find myself a bit puzzled by some of it's behaviour. The unit is clean and passes all the self-tests. When I first got it it seemed to work very nicely

Re: [time-nuts] HP 5372A advice

Hi Morris, On 01/20/2016 03:48 AM, Morris Odell wrote: Hi all, I recently was fortunate enough to obtain one of these amazing instruments but regrettable no copy of the main operating manual. I find myself a bit puzzled by some of it's behaviour. I strongly advice you to download the

[time-nuts] HP 5372A available in Sydney, Australia

Since its a relevant piece of kit I've included the mail from ARNSW here. Two units are available if anybody is interested. Cheers. HP 5372A and Wave Technologies DTS2070 digital time system. Amateur Radio NSW as for sale two HP 5372A time and interval analysers. Both are working with good

[time-nuts] HP 5372A speed and stability

Hi all,   Does somebody know the speed and stability of HP 5372A Time Interval analyzer?   in terms of the number of digit per second. Also, what's the standard built-in frequency reference?   Lastly, what's the max number of digit when performs as a frequency counter?   Thanks and Regards,

[time-nuts] HP 5372A speed and stability

Information is on the www.agilent.com website 73s John GW3XPK ___ 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.

Re: [time-nuts] HP 5372A speed and stability

HI Simple answer: It's a 200 ps (single shot) box. That makes it similar to a 53132, but not in the same league as a SR--620. Being as old as it is, some of the fancy math in a CNT-90 is not included with a 5372. Still a very useful box though. Normally you see them with a HP 10811. I don't

Re: [time-nuts] HP 5372A speed and stability

Dickson, With a gate time of 10 seconds, in statistics mode you can see 13 digits at 10MHz easily. While I agree it is not an SR620, it a very worth while unit to own. Much nicer than the 5370B units to operate, and if you get the C model, you can measure all the way to a little over 2GHz.

Re: [time-nuts] HP 5372A speed and stability

On 04/15/2012 09:55 PM, Bob Camp wrote: HI Simple answer: It's a 200 ps (single shot) box. That makes it similar to a 53132, but not in the same league as a SR--620. Being as old as it is, some of the fancy math in a CNT-90 is not included with a 5372. Still a very useful box though.

Re: [time-nuts] HP 5372A speed and stability

Hi I think I might stand up and defend the poor old 5370. It's a beast and not anywhere as sexy as a 5371 or (better yet) the 5372. It does indeed have better single shot resolution though. Bob On Apr 15, 2012, at 4:42 PM, Jerry Mulchin wrote: Dickson, With a gate time of 10 seconds, in

Re: [time-nuts] HP 5372A speed and stability

On 04/15/2012 11:30 PM, Bob Camp wrote: Hi I think I might stand up and defend the poor old 5370. It's a beast and not anywhere as sexy as a 5371 or (better yet) the 5372. It does indeed have better single shot resolution though. Indeed. While the later has spiffy 68k processors with

Re: [time-nuts] HP 5372A speed and stability

Sorry, didn't mean to imply that the 5370B was not worth owning. It is a very nice unit as well. I have one of these as well, but unfortunately I lost one input channel, bad input custom IC. If I could only find a replacement for the bad IC I would use it as well. Right now it's just a nice

Re: [time-nuts] HP 5372A speed and stability

Hi Even back when they were new that IC was a beyond belief priced item. The same goes for the input on a 5335. You can indeed rig up something to replace either one, but I know of no direct replacements. Bob On Apr 15, 2012, at 7:19 PM, Jerry Mulchin wrote: Sorry, didn't mean to imply that

[time-nuts] HP 5372a fs

Hi, I am selling my HP 5372a due to lack of use. It passes all self checks. Asking 650 plus shipping from 18840. Have a bunch of things I'll be listing over the next day or so. Wife decrees stuff must go. Norm n3ykf ___ time-nuts mailing list --

Re: [time-nuts] hp 5372A Parts available

-Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of J. L. Trantham Sent: Sunday, March 20, 2011 8:34 AM To: 'Discussion of precise time and frequency measurement' Subject: Re: [time-nuts] hp 5372A Parts available Eric, I have a 5372A

Re: [time-nuts] hp 5372A Parts available

-Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of paul swed Sent: Monday, March 21, 2011 9:07 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] hp 5372A Parts available I would be interested in any cpu/eproms

[time-nuts] hp 5372A Parts available

A1-A6 board have been sold to a buyer in Brazil. The only logic bard I have left is the 05372-6008 (A8 I think). I still have cosmetic parts like the the front panel top bottom and sides. I have all the sheet metal internal stuff and all the power supply boards and the power transformer. I

Re: [time-nuts] hp 5372A Parts available

There is one on ebay now that is a perfect match for you leftover parts. Greg On 3/21/2011 1:08 PM, Eric Haskell wrote: A1-A6 board have been sold to a buyer in Brazil. The only logic bard I have left is the 05372-6008 (A8 I think). I still have cosmetic parts like the the front panel top

Re: [time-nuts] hp 5372A Parts available

Do you have any Option 030 (2 GHz) parts? Joe -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com]On Behalf Of Eric Haskell Sent: Monday, March 21, 2011 2:09 PM To: Time Nuts Subject: [time-nuts] hp 5372A Parts available A1-A6 board have been sold

Re: [time-nuts] hp 5372A Parts available

I've already purchased the eprom board. I'll try to upload them when I get the board. I got it as a spare, so I can compare the firmware versions. My current board is an early version. Bill Ezell -- They said 'Windows or better' so I used Linux. On 01/-10/-28163 02:59 PM, Bob Camp

Re: [time-nuts] hp 5372A Parts available

From: Eric Haskell eric_hask...@hotmail.com To: Time Nuts time-nuts@febo.com Sent: Mon, March 21, 2011 2:08:44 PM Subject: [time-nuts] hp 5372A Parts available A1-A6 board have been sold to a buyer in Brazil. The only logic bard I have left is the 05372-6008 (A8 I think). I

Re: [time-nuts] hp 5372A Parts available

Do you have any Option 030 (2 GHz) parts? Joe No the unit I stripped had NO options installed, not counting the 2 54002A pods. Eric ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

Re: [time-nuts] hp 5372A Parts available

Great I don't have one but I know the value of the eproms on this older gear and have been sending them to Diddiers site for others. Regards On Mon, Mar 21, 2011 at 6:03 PM, wje w...@quackers.net wrote: I've already purchased the eprom board. I'll try to upload them when I get the board. I

[time-nuts] hp 5372A Parts available

I just scrap out a 5372a. The unit was working but reporting a histogram error. I am keeping a few parts, the rest is available. Let me know if you need anything. Eric Haskell ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

Re: [time-nuts] hp 5372A Parts available

stays with the channel. I think I need to repair one of the boards. Where are you located? Joe -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Eric Haskell Sent: Sunday, March 20, 2011 1:42 AM To: time-nuts@febo.com Subject: [time-nuts

Re: [time-nuts] hp 5372A Parts available

-boun...@febo.com] On Behalf Of J. L. Trantham Sent: Sunday, March 20, 2011 8:34 AM To: 'Discussion of precise time and frequency measurement' Subject: Re: [time-nuts] hp 5372A Parts available Eric, I have a 5372A that has a problem on one of the input channels. I mistakenly unplugged the input

Re: [time-nuts] HP 5372A vs. 5370A

Hi The 5371 / 5372 are never going to be as popular as the 5370 in terms of people needing support. They just aren't that common. Getting binary dumps into one of the software packages would be very nice. The rest of the stuff is much further down my list. Without a binary dump, you can't

Re: [time-nuts] HP 5372A vs. 5370A

In message 539fb2cd-a764-4825-8932-970d4253b...@rtty.us, Bob Camp writes: The 5371 / 5372 are never going to be as popular as the 5370 in terms of people needing support. They just aren't that common. Getting binary dumps into one of the software packages would be very nice. The rest of the

Re: [time-nuts] HP 5372A vs. 5370A

I don't understand why you need something like the 537x counters for long-term measurement. The 200 ps resolution of the 5372A gives you a noise floor of about 5e-14 @ 4000 seconds. Something like the Pictic II gives you better resolution at a fraction of the size, heat, noise, and power.

Re: [time-nuts] HP 5372A vs. 5370A

My 5372A is firmware version 3127 [12 July 1991] e/w option 040. Serial number prefix is 3301. Ed Poul-Henning Kamp wrote: In message 539fb2cd-a764-4825-8932-970d4253b...@rtty.us, Bob Camp writes: The 5371 / 5372 are never going to be as popular as the 5370 in terms of people needing

Re: [time-nuts] HP 5372A vs. 5370A

Ed, On 10/02/11 00:00, Ed Palmer wrote: Magnus Danielson wrote: The Frequency vs. Time view is lovely. The 5372A does calculate ADEV but does not provide ADEV plots. Since they don't specify, I'm assuming that it uses the original, non-overlapping calculation. True? Well... it does care

Re: [time-nuts] HP 5372A vs. 5370A

of precise time and frequency measurement Subject: Re: [time-nuts] HP 5372A vs. 5370A I don't understand why you need something like the 537x counters for long-term measurement. The 200 ps resolution of the 5372A gives you a noise floor of about 5e-14 @ 4000 seconds. Something like the Pictic II

Re: [time-nuts] HP 5372A vs. 5370A: Thanks

To All who have contributed, Your answers have been very informative, and I appreciate the time the people have taken to answer my initial request on the differences between the HP 5372A and 5370A T.I. Counters/Analyzers. The bottom line I get out of this thread is that both are useful to

Re: [time-nuts] HP 5372A vs. 5370A: Thanks

I second that 1000% Now to figure out whats wrong in the two dead 5370Bs. Glad it is them and not the 72A ! On Thu, Feb 10, 2011 at 1:11 PM, Bert, VE2ZAZ ve2...@yahoo.ca wrote: To All who have contributed, Your answers have been very informative, and I appreciate the time the people have

Re: [time-nuts] HP 5372A vs. 5370A: Thanks

, not looking for another). Bob -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Pete Lancashire Sent: Thursday, February 10, 2011 4:24 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] HP 5372A vs. 5370A: Thanks

Re: [time-nuts] HP 5372A vs. 5370A: Thanks

...@febo.com] On Behalf Of Pete Lancashire Sent: Thursday, February 10, 2011 4:24 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] HP 5372A vs. 5370A: Thanks I second that 1000% Now to figure out whats wrong in the two dead 5370Bs. Glad it is them

Re: [time-nuts] HP 5372A vs. 5370A

:04 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] HP 5372A vs. 5370A In message 539fb2cd-a764-4825-8932-970d4253b...@rtty.us, Bob Camp writes: The 5371 / 5372 are never going to be as popular as the 5370 in terms of people needing support. They just aren't

[time-nuts] HP 5372A vs. 5370A

Hi everyone. I own an HP 5370A. I do GPIB and Labview, KE5FX Utilities, DF6JB's Plotter, spreadsheets etc. Always looking to improve my setup... Here is a simple question: Why should I try to get an HP 5372A (or 5371A)? What are the benefits over the 5370A? Worth spending? Thanks in advance,

Re: [time-nuts] HP 5372A vs. 5370A

In message 699621.92879...@web112010.mail.gq1.yahoo.com, Bert, VE2ZAZ write s: Here is a simple question: Why should I try to get an HP 5372A (or 5371A)? What are the benefits over the 5370A? Worth spending? Faster measurements (but not quite as precise) and zero dead-time measurements. See for

Re: [time-nuts] HP 5372A vs. 5370A

Hi Bert, On 09/02/11 19:56, Bert, VE2ZAZ wrote: Hi everyone. I own an HP 5370A. I do GPIB and Labview, KE5FX Utilities, DF6JB's Plotter, spreadsheets etc. Always looking to improve my setup... Here is a simple question: Why should I try to get an HP 5372A (or 5371A)? What are the benefits

Re: [time-nuts] HP 5372A vs. 5370A

If you've got one, it can be hard to justify buying the other unless you have some very specific requirements. There's a lot of overlap between them. I have a 5372A and have wondered if it's worth getting a 5370(A or B). So far, the answer for me is no. Here are a few things that I've used

Re: [time-nuts] HP 5372A vs. 5370A

Hi Ed, excellent email. You raise the SNR of this forum! I have tried to measure the CW-12 output myself with phase noise and Allan Deviation equipment, and the constant cycle jumps prevent these from giving sensible results. Both PN and ADEV plots look awful, many orders of magnitude

Re: [time-nuts] HP 5372A vs. 5370A

: Wednesday, February 09, 2011 4:14 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] HP 5372A vs. 5370A If you've got one, it can be hard to justify buying the other unless you have some very specific requirements. There's a lot of overlap between them. I have

Re: [time-nuts] HP 5372A vs. 5370A

saidj...@aol.com wrote: Hi Ed, excellent email. You raise the SNR of this forum! Thanks Said. It's rare that I have a chance to contribute. Many of these discussions are way over my head, but I'm learning. I have tried to measure the CW-12 output myself with phase noise and Allan

Re: [time-nuts] HP 5372A vs. 5370A

On 09/02/11 22:14, Ed Palmer wrote: I routinely use the 5372A to make multiple 1 sec. measurements of frequency or time interval and then dump the results via GPIB for analysis. Standard stuff for either the 5370 or 5372 except as mentioned elsewhere, these measurements are made with no dead

Re: [time-nuts] HP 5372A vs. 5370A

On 09/02/11 22:36, Bob Camp wrote: Hi We really do need a simple app to extend the 5371 and 5372 for longer time ranges. If there's one out there, I've certainly missed it as I've looked around. A very simple way is to trigger measurements regularly (say 10 Hz) and then read-out the

Re: [time-nuts] HP 5372A vs. 5370A

...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Ed Palmer Sent: Wednesday, February 09, 2011 4:14 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] HP 5372A vs. 5370A If you've got one, it can be hard to justify buying the other unless you have some

Re: [time-nuts] HP 5372A vs. 5370A

Magnus Danielson wrote: On 09/02/11 22:14, Ed Palmer wrote: I routinely use the 5372A to make multiple 1 sec. measurements of frequency or time interval and then dump the results via GPIB for analysis. Standard stuff for either the 5370 or 5372 except as mentioned elsewhere, these measurements

Re: [time-nuts] HP 5372A vs. 5370A

Here is a simple question: Why should I try to get an HP 5372A (or 5371A)? What are the benefits over the 5370A? Worth spending? The 5370A/B is nice because its one-shot resolution is better than any other HP/Agilent counter, prior to the release of the 532xxA models a few months ago. Also,

Re: [time-nuts] HP 5372A Fan

At 12:44 AM 3/10/2010, Ed Palmer wrote... It would seem to make more sense to have the fan blowing hot air out the back and drawing the hot inside air over the temperature sensor. The reason to have a fan blow in is so you can put a filter on it. It also creates more turbulence inside the

Re: [time-nuts] HP 5372A Fan

Good point about the filter, but it doesn't appear that the 5371a or 5372a ever had a filter. Unless it was just done out of habit because other HP units did have a filter. Ed Mike S wrote: At 12:44 AM 3/10/2010, Ed Palmer wrote... It would seem to make more sense to have the fan blowing

Re: [time-nuts] HP 5372A Fan

Mike S wrote: At 12:44 AM 3/10/2010, Ed Palmer wrote... It would seem to make more sense to have the fan blowing hot air out the back and drawing the hot inside air over the temperature sensor. The reason to have a fan blow in is so you can put a filter on it. It also creates more

Re: [time-nuts] HP 5372A Fan

Ed Palmer wrote: Good point about the filter, but it doesn't appear that the 5371a or 5372a ever had a filter. Unless it was just done out of habit because other HP units did have a filter. If you want to toss a filter on it because your environment isn't exactly clean, it is trivial. Maybe

Re: [time-nuts] HP 5372A Fan

Ed, From your description of the fan noise, I have one concern. If the fan speed seems to increase without a good cleaning or change in the supply voltage, then it's likely that the airflow has been decreased, an obvious speed up is not good news. Pete Rawson On Mar 9, 2010, at 10:44 PM, Ed

[time-nuts] HP 5372A Fan

Are you sure that it has a variable speed fan? My 5372A has a pretty quiet fan and I have never tried to change it. I am assuming that it uses the same 117V fan as the 5371A. That thermal switch may be a power supply shutdown. I have a couple of 5371A's that are a different matter.

Re: [time-nuts] HP 5372A Fan

Yes, the fan is variable speed and it's 12V DC. It's described in the motherboard section of the service manual on page 11-4 (pdf page 503). That's why I thought it was so odd that the fan is blowing cool outside air over the thermal sensor on the motherboard. I guess they could have

[time-nuts] HP 5372A Fan

I have a question for owners of the HP 5372A (and probably 5371A) Time Interval Analyzer. Is the fan on the back blowing out or sucking in? I was looking at mine to see about replacing the fan with a quieter one and I was surprised to see that mine is sucking in. This doesn't make sense to

[time-nuts] HP 5372a error 160

Hi all!! Bid on and got an HP 5372a. Supposed to be tested, working. Powers up to error 160 out of sensitivity calibration. Did download the svc man from Agilent. Spent a few minutes looking through the manual. Not sure what to make of it. It's not obvious whether a complete cal needs to be

Re: [time-nuts] HP 5372a error 160

and frequency measurement Subject: [time-nuts] HP 5372a error 160 Hi all!! Bid on and got an HP 5372a. Supposed to be tested, working. Powers up to error 160 out of sensitivity calibration. Did download the svc man from Agilent. Spent a few minutes looking through the manual. Not sure what to make

Re: [time-nuts] HP 5372a error 160

; the procedure is simple. -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com]on Behalf Of Norman J McSweyn Sent: Friday, September 04, 2009 8:16 AM To: Discussion of precise time and frequency measurement Subject: [time-nuts] HP 5372a error 160 Hi all!! Bid

Re: [time-nuts] HP 5372a error 160

It is easy to do. -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com]on Behalf Of Norman J McSweyn Sent: Friday, September 04, 2009 8:53 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] HP 5372a error 160 Francesco

[time-nuts] HP 5372A Frequency Measurement Techniques

Hi All, I have recently purchased the above counter and am working on understanding it for frequency and interval measurement. The manual seems a bit obscure about frequency measurement techniques. I'd like to find someone with more experience with it to ask a few questions.

Re: [time-nuts] HP 5372A Frequency Measurement Techniques

From: Doug Millar [EMAIL PROTECTED] Subject: [time-nuts] HP 5372A Frequency Measurement Techniques Date: Thu, 29 Jun 2006 09:30:43 -0700 Message-ID: [EMAIL PROTECTED] Hi All, Doug, I have recently purchased the above counter and am working on understanding it for frequency