Re: [time-nuts] SR620/PM66xx/CNT-90 input stages

Bruce wrote: If the source impendance at dc is 10k at dc a bias current of a few microamp produces a dc offset of tens of millivolts which may be an issue if the signal amplitude is low and has a low slew rate. Jeez, Bruce, it was nothing but a thought experiment to illustrate why an

Re: [time-nuts] SR620/PM66xx/CNT-90 input stages

Your assumptions about my comment are unfounded. It was just intended as an additional reason as to why direct connection to a comparator input isnt a good idea with a high source impedance. The original post asked why a buffer was needed. Bruce > > On 21 June 2017 at 22:14 Charles

Re: [time-nuts] SR620/PM66xx/CNT-90 input stages

Moin, On Tue, 20 Jun 2017 17:11:24 -0400 Charles Steinmetz wrote: > I was going tp post the Smith chart for the input of the AD96885/7 ECL > comparator they use, but was surprised to find that AD did not include > it on the datasheet. However, just from the spec table

Re: [time-nuts] SR620/PM66xx/CNT-90 input stages

Attila wrote: Now, if the downstream circuit would be low impedance, I could understand that, but the sink is a comparator with a high impedance input (only a few µA input current). I am sure the engineers had a good reason to add those amplifiers, but I cannot guess why. Would someone be so

Re: [time-nuts] SR620/PM66xx/CNT-90 input stages

If the source impendance at dc is 10k at dc a bias current of a few microamp produces a dc offset of tens of millivolts which may be an issue if the signal amplitude is low and has a low slew rate. Bruce > > On 21 June 2017 at 09:11 Charles Steinmetz wrote: > >

Re: [time-nuts] SR620 TCXO calibration

On 19 June 2017 at 21:43, David C. Partridge wrote: > Yes please. ... > OK, the code is here http://www.kirkbymicrowave.co.uk/tmp/srs-0.02.tar.gz Note 1) It has only be tested on Solaris SPARC, with a National Instruments GPIB card. 2) I would expect it to run

Re: [time-nuts] SR620/PM66xx/CNT-90 input stages

Its somewhat difficult to achieve a 1Megohm input with just a bipolar comparator input stage especially if AC coupling is required. Bruce > > On 20 June 2017 at 19:20 Attila Kinali wrote: > > Hi, > > I had a look at the PM668x[1] and CNT-90[2] schematics

Re: [time-nuts] SR620/PM66xx/CNT-90 input stages

se time and frequency measurement"<time-nuts@febo.com>; Subject: [time-nuts] SR620/PM66xx/CNT-90 input stages Hi, I had a look at the PM668x[1] and CNT-90[2] schematics yesterday and noticed one thing: The input stages are strikingly similar to the SR620[3] (down to the parts use

[time-nuts] SR620/PM66xx/CNT-90 input stages

Hi, I had a look at the PM668x[1] and CNT-90[2] schematics yesterday and noticed one thing: The input stages are strikingly similar to the SR620[3] (down to the parts used) and all of them have a gain 1 amplifier infront of the comparator. The PM668x service manual explicitly calls it "impedance

Re: [time-nuts] SR620 TCXO calibration

Yes please. ... -Original Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Dr. David Kirkby (Kirkby Microwave Ltd) Sent: 19 June 2017 21:03 To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] SR620 TCXO calibration On 19 June 2017

Re: [time-nuts] SR620 TCXO calibration

actually I think mine also has an OCXO D. -Original Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Dr. David Kirkby (Kirkby Microwave Ltd) Sent: 19 June 2017 21:21 To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] SR620 TCXO

Re: [time-nuts] SR620 TCXO calibration

I should have added, mine had an OCXO - I just see you had a TCXO. I don't have the SR620 any more. I swapped it, along with a HP 4.2 GHz signal generator, for an HP 4291B impedance and material analyzer. Dave ___ time-nuts mailing list --

Re: [time-nuts] SR620 TCXO calibration

On 19 June 2017 at 15:35, David C. Partridge wrote: > I think I'm being dense, but I can't work out how to get this thing to > display CalDat 04. I have managed to get it to display CalDat 0 value, > but > can't work out how to step through to view adjust CalDat

[time-nuts] SR620 TCXO calibration

I think I'm being dense, but I can't work out how to get this thing to display CalDat 04. I have managed to get it to display CalDat 0 value, but can't work out how to step through to view adjust CalDat 04. Once I do get there, how do I manage to adjust the CalDat value while observing the

Re: [time-nuts] SR620 Failure Code.

Hi > On Dec 22, 2016, at 5:57 PM, Gary Woods wrote: > > On Thu, 22 Dec 2016 16:50:17 -0500, you wrote: > >> That's just crazy, but that was the problem. > > It's documented, so it's not a bug. … so that would make it a feature, right? Bob > > > -- > Gary Woods

Re: [time-nuts] SR620 Failure Code.

On Thu, 22 Dec 2016 16:50:17 -0500, you wrote: >That's just crazy, but that was the problem. It's documented, so it's not a bug. -- Gary Woods AKA K2AHC- PGP key on request, or at home.earthlink.net/~garygarlic Zone 5/4 in upstate New York, 1420' elevation. NY WO G

Re: [time-nuts] SR620 Failure Code.

Thanks to Jarl OZ9MO my SR620 is running fine again. He pointed me to the manual where I found this. "If the UHF prescaler of channel A is selected when the unit is powered off and then on again, the unit will display "TEST ERROR 34". This error may be corrected by deselecting the UHF of

Re: [time-nuts] SR620 Failure Code.

Complete manuals, including service info, are available on the net. Google for SR620 manual Dave M W2GPS wrote: Time-nuts, My SR620 has started reporting "test error 34" on power-up and will do nothing after that. Does anyone know what that message means? I have a reasonable lab and I

Re: [time-nuts] SR620 Failure Code.

Hi There are a number of SRS 620’s with big block letter warning sheets taped to the top of them about error 34. It is a *very* common thing to run into and (obviously) something the guys in the repair shop get tired of really fast. Bob > On Dec 22, 2016, at 1:27 PM, Magnus Danielson

Re: [time-nuts] SR620 Failure Code.

Here you can find all about the SR620: search for SR620. On Thu, Dec 22, 2016 at 5:53 PM, W2GPS wrote: > Time-nuts, > > > > My SR620 has started reporting "test error 34" on power-up and will do > nothing after that. Does

Re: [time-nuts] SR620 Failure Code.

Rick, On 12/22/2016 05:53 PM, W2GPS wrote: Time-nuts, My SR620 has started reporting "test error 34" on power-up and will do nothing after that. Does anyone know what that message means? I have a reasonable lab and I would try to repair the unit myself but I have no documentation. Is service

[time-nuts] SR620 Failure Code.

Time-nuts, My SR620 has started reporting "test error 34" on power-up and will do nothing after that. Does anyone know what that message means? I have a reasonable lab and I would try to repair the unit myself but I have no documentation. Is service documentation available or should I just

Re: [time-nuts] SR620: odd measurements when in remote control

> on start up i have an odd behavior. > 0, 1.99881895E+07 > 0, 1.99881912E+07 > 0, 1.99881757E+07 > 7, 1.99881856E+07 > 17, 1.99881878E+07 > 27, 1.99881900E+07 > What do you think? Looks like you are expecting readings every 10 seconds but it's sending a few samples

[time-nuts] SR620: odd measurements when in remote control

Hello, I have an SR620 that i am trying to get some more life out of. I have dedicated a raspberry pi 2 to recode data and make the files available through the network. I wrote a small c deamond that will setup the counter to make frequency measurements and save the result to a file

Re: [time-nuts] SR620 Problem

PM To: Discussion of precise time and frequency measurement <time-nuts@febo.com> Subject: Re: [time-nuts] SR620 Problem You might say where you are. Maybe someone lives close that can assist you. Regards, Tom - Original Message - From: "Don@True-Cal" <truecalservi...@gm

Re: [time-nuts] SR620 Problem

Sorry if this is a repeat but not showing up in my sent mail. Changed the list address slightly. Email clients lie all the time. When there is a question of whether a mail to the list was distributed, it is very useful to go to the list web page (address is at the bottom of every list

Re: [time-nuts] SR620 Problem

. Regards, Don -Original Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Tom Miller Sent: Monday, August 29, 2016 4:37 PM To: Discussion of precise time and frequency measurement <time-nuts@febo.com> Subject: Re: [time-nuts] SR620 Problem You might say whe

Re: [time-nuts] SR620 Problem

quot;'Time Nuts Group'" <time-nuts@febo.com> Sent: Monday, August 29, 2016 5:17 PM Subject: [time-nuts] SR620 Problem Hello All, Sorry if this is a repeat but not showing up in my sent mail. Changed the list address slightly. I'm looking for someone that has repair expe

Re: [time-nuts] SR620 Problem

You might say where you are. Maybe someone lives close that can assist you. Regards, Tom - Original Message - From: "Don@True-Cal" <truecalservi...@gmail.com> To: "'Time Nuts Group'" <time-nuts@febo.com> Sent: Monday, August 29, 2016 5:17 PM Subject: [t

[time-nuts] SR620 Problem

Hello All, Sorry if this is a repeat but not showing up in my sent mail. Changed the list address slightly. I'm looking for someone that has repair experience on the SR620 TIC. I have a failed unit that has previously worked perfectly for many years while running continuously on my lab

Re: [time-nuts] SR620 testing

>>> XY outputs - text at the top is slanted and text near the middle right is >>> overlaid. I don't know if I care about this, as I am unlikely to use this >>> feature. I tried this briefly on a digital scope and it looked a bit iffy. Maybe it's better on an analogue scope. If I remember

Re: [time-nuts] SR620 testing

I don't think I would use the XY output, but I'm sure that this tilted and overlaid text is not correct. https://dl.dropboxusercontent.com/u/19599147/XY%20mode.jpg Joe Gray W5JG ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

Re: [time-nuts] SR620 testing

Hi, The SR620 has a Z80 dedicated to update the X/Y DACs. For some trimmings it really helps. The SR620 is a mix of a relatively flexible counter, yet it has some limits, which can be annoying for some measurements. In the end I kind of like it. Cheers, Magnus On 02/23/2016 01:13 PM, Bob

Re: [time-nuts] SR620 testing

: Tuesday, February 23, 2016 6:13 AM To: Discussion of precise time and frequency measurement <time-nuts@febo.com> Subject: Re: [time-nuts] SR620 testing Hi You may have cleaned up a dirty pot wiper as well … The SR620 has X/Y outputs? Who knew? … that’s how often that feature gets used aroun

Re: [time-nuts] SR620 testing

Hi You may have cleaned up a dirty pot wiper as well … The SR620 has X/Y outputs? Who knew? … that’s how often that feature gets used around here. Bob > On Feb 23, 2016, at 12:14 AM, Joseph Gray wrote: > > Ignore the problem with EXT trigger. I did a factory reset and now

Re: [time-nuts] SR620 testing

Ignore the problem with EXT trigger. I did a factory reset and now it is working. I should have thought to reset it to begin with. Joe Gray W5JG On Mon, Feb 22, 2016 at 8:14 PM, Joseph Gray wrote: > Finally got an SR620 at a decent price. I'm going through the > Functional

[time-nuts] SR620 testing

Finally got an SR620 at a decent price. I'm going through the Functional Tests and the Performance Tests now. So far, I have two anomalies. Pg 62 Functional Test - EXT input. When I vary the EXT trigger knob, I don't get the trigger LED, except that it flashes briefly at one spot as I move the

[time-nuts] SR620

OK, who got the SR620 with the "test error 34"? From looking at the manual, it may simply be user error and the instrument may be just fine. If you are the buyer, I hope that is true and that you got a bargain. I took a stab at buying it, but wasn't willing to chance too much, in case there was

Re: [time-nuts] SR620 question

Simply pasting the link did not work, but it was close enough :-) The links that include an IP address (like 81.226.54.139 below) only work until midnight EST, then they are cleared. It is easy enough (but not necessarily intuitive) to go to the manuals page and search again for the document.

Re: [time-nuts] SR620 question

Gerhard, On 01/27/2015 09:00 PM, Gerhard Hoffmann wrote: Hi, fellow time nuts, I have some questions regarding the Stanford SR620: 1. Is it a drawback wrt ADEV when a SR620 does not have have the opt. oven if I have an ultra clean external reference? Does it use the external ref directly or

Re: [time-nuts] SR620 question

Gerhard wrote: 1. Is it a drawback wrt ADEV when a SR620 does not have have the opt. oven if I have an ultra clean external reference? Does it use the external ref directly or does it just pull the own reference to the external value in the long run, no matter if it's the good or the bad

Re: [time-nuts] SR620 question

Am 28.01.2015 um 00:23 schrieb Magnus Danielson: It locks it up with a PLL. See page 9 in PDF below, smack in the middle is the input circuit and PLL. This page also gives you all the hints of how to wire in a better oscillator if you wish. 2 I have seen that the manual has a parts list

[time-nuts] SR620 question

Hi, fellow time nuts, I have some questions regarding the Stanford SR620: 1. Is it a drawback wrt ADEV when a SR620 does not have have the opt. oven if I have an ultra clean external reference? Does it use the external ref directly or does it just pull the own reference to the external value

[time-nuts] SR620 - register as being warmed up ????

I am hoping to buy a SR620 from a seller who is not familiar with the instrument, but who 1) Has knowledge of electronic test equipment in general. 2) Is willing to test the SR620 before an international shipment. This puts me in a somewhat better position than typicall eBay sale with comments

Re: [time-nuts] SR620 - any gotchas buying a used one?

David, Do download the manual. Consider getting the hardprint manual. The minumum you can expect of a seller is that they power the unit on, and it should not show an error on start-up. You can try to ask for them to do the performance check in the manual. If the frequency measure is

Re: [time-nuts] SR620 - any gotchas buying a used one?

Hi The one that I *always* forget: It has a fan. Who knows where it’s been. Pop the top and clean out any dust packed into the inside of the beast. It’s very easy to get used to gear that’s been in clean environments and get blind sided by the one that lived on the planet dust world. Bob

[time-nuts] SR620 - any gotchas buying a used one?

After regrettably selling my 5370B a few years ago, I decided to look for a used SR620. Are there any particular issues with these that could be tested by the seller prior to shipping it? I have not downloaded the manual yet, but I assume there's a basic test in there - probably similar to that

Re: [time-nuts] SR620 - any gotchas buying a used one?

Hi The counter has a fairly extensive auto-cal / auto test built into it. Simply looping the output back to the input is about all the setup needed. Checking the calibration on the OCXO is the only thing that takes external gear. Past that, yes there are a variety of calibration settings and

Re: [time-nuts] SR620 - any gotchas buying a used one?

The SR620's manual is perfect, there is a whole chapter has detail information of performance test. You can use that way for check the counter's condition. Hui Zhang At 2014-11-22 07:51:41, Dr. David Kirkby (Kirkby Microwave Ltd) drkir...@kirkbymicrowave.co.uk wrote:

Re: [time-nuts] SR620 - any gotchas buying a used one?

Hi Probably the best information out there on setting up a SR620 is buried in the archives of this list back a few years. The back and forth required on some of the adjustments is far from obvious. You do need to start from the manual and get it as far as the manual will allow. You then go

Re: [time-nuts] SR620 - any gotchas buying a used one?

Hi David: I like it. Traded an HP 53132 (user hostile menu system, an the 12 digits per second applies only to frequency, not time) for it. http://www.prc68.com/I/TandFTE.shtml#SR620 Fast precision measurement ( 1ps, 12 digits/sec) hint: http://www.prc68.com/I/FTS4060.shtml#SR620Fast

Re: [time-nuts] SR620 - any gotchas buying a used one?

Hi Bob: I agree with you. But the chapter is a easy way to check your new counter when it arrived, and it's not only a calibration of just self test, it's testing counter's performance on some level. Regards. Hui Zhang At 2014-11-22 10:22:53, Bob Camp kb...@n1k.org wrote: Hi

Re: [time-nuts] SR620 - any gotchas buying a used one?

Hi If I follow your hint: I set the 620 up for a 1 second gate and then I ask for an average of 1,000 readings. This takes 1,000 seconds? Bob On Nov 21, 2014, at 9:32 PM, Brooke Clarke bro...@pacific.net wrote: Hi David: I like it. Traded an HP 53132 (user hostile menu system, an the

Re: [time-nuts] SR620 - any gotchas buying a used one?

Hi From what I’ve seen, many 620’s that have been sitting for a few years will not operate until the calibration procedure is run. They drift far enough out that they pitch errors trying to do simple things. Let the beast warm up for an hour and run the cal as soon as you get a used one. Bob

Re: [time-nuts] SR620 binary dump

Hi Tom, On 08/03/14 22:12, Tom Van Baak wrote: You make me curious. Any specific issue you're having? I haven't tried doing any programming to the SR620 yet, but I have some plans to do it. Cheers, Magnus Hi Magnus, Thanks for asking. Here's an update. I was curious why time interval or

Re: [time-nuts] SR620 binary dump

Tom, On 04/03/14 01:40, Tom Van Baak wrote: Has anyone used the binary dump feature of the SR620 (command BDMP) or the x1000 feature (command EXPD)? If you have, please send me email off-list. If you haven't, I will post a report to time-nuts later this week. You make me curious. Any

Re: [time-nuts] SR620 binary dump

You make me curious. Any specific issue you're having? I haven't tried doing any programming to the SR620 yet, but I have some plans to do it. Cheers, Magnus Hi Magnus, Thanks for asking. Here's an update. I was curious why time interval or period measurements give slightly different

Re: [time-nuts] SR620 binary dump

Using XREL exposes an additional digit of resolution. Set XREL to 1E7 and then you get ascii readings like: 1.E-4 -6.E-5 2.E-4 -1.4E-4 .0E-6 -1.9E-4 I should clarify. Yes, it appears that when using XREL, one can get ~2.7 ps timing resolution/granularity for

Re: [time-nuts] SR620 binary dump

...I'll try that, too. Tomorrow. Volker Am 09.03.2014 00:29, schrieb Tom Van Baak: Using XREL exposes an additional digit of resolution. Set XREL to 1E7 and then you get ascii readings like: 1.E-4 -6.E-5 2.E-4 -1.4E-4 .0E-6 -1.9E-4 I should clarify. Yes, it appears

[time-nuts] SR620 binary dump

Has anyone used the binary dump feature of the SR620 (command BDMP) or the x1000 feature (command EXPD)? If you have, please send me email off-list. If you haven't, I will post a report to time-nuts later this week. Thanks, /tvb ___ time-nuts mailing

[time-nuts] SR620: cal error 23

Hi all, While auto calibrating the SR620 I get the message cal error 23 - the manual isn't that specific about this message, it only states, that error numbers 19 to 23 are caused by Stop TAC problems. However, the counter counts, but I can't do automatic calibration any more. Anyone

Re: [time-nuts] SR620: cal error 23

On Mon, Mar 18, 2013 at 04:28:32PM +0100, Volker Esper wrote: Hi all, While auto calibrating the SR620 I get the message cal error 23 - the manual isn't that specific about this message, it only states, that error numbers 19 to 23 are caused by Stop TAC problems. The manual also

Re: [time-nuts] SR620: cal error 23

Am 18.03.2013 18:00, schrieb Herbert Poetzl: The manual also states that error codes 19-23 are the same as the start values (n - 16), so 23 minus 16 should be the same as '7' i.e. 'stop linearity byte out of range' Where do you read that, I can't find it :-/ Volker

Re: [time-nuts] SR620: cal error 23

On Mon, Mar 18, 2013 at 07:34:26PM +0100, Volker Esper wrote: Am 18.03.2013 18:00, schrieb Herbert Poetzl: The manual also states that error codes 19-23 are the same as the start values (n - 16), so 23 minus 16 should be the same as '7' i.e. 'stop linearity byte out of range' Where do you

Re: [time-nuts] SR620: cal error 23

Am 18.03.2013 19:53, schrieb Herbert Poetzl: page 40, search for 'stop tac' Herbert, you are the best :-) I didn't expect the error codes in the programming commands section. I'm afraid it could be a hardware failure. Thanks Volker ___

Re: [time-nuts] SR620: cal error 23

Running Auto Cal a few seconds after switching the counter on, the calibration succeeds, though with values different from the warm ones (who'd have thunk). After warming up, error 23 wins. I have to open it and do the old school trouble shooting with coolant spray... However, any advice,

[time-nuts] SR620, using the RS232

Hello Time-nuts, Happy New Year, I am having a problem with my SR620. I am using the RS232 interface to configure and read the results. I am using my own code, and I am continually make revisions, updates, (Spelled: E-R-R-O-R) to my code. Every couple days I manage to scramble the brains of

Re: [time-nuts] SR620, using the RS232

Hi It sounds like a bit like buffer overflow in the SR620 that's nuking something else. You may be asking it to do slightly more than it's capable of…. Bob On Dec 30, 2012, at 1:42 PM, Ed Mersich wa6...@comcast.net wrote: Hello Time-nuts, Happy New Year, I am having a problem with my

[time-nuts] SR620 is sold!

Thanks for the interest the SR620 is sold. Corby Woman is 53 But Looks 25 Mom reveals 1 simple wrinkle trick that has angered doctors... http://thirdpartyoffers.juno.com/TGL3141/50b68d00e6768d0043bast03duc

Re: [time-nuts] SR620 software and adjustment

I enjoy beeing here, thank you all for your responses. 73 Volker ___ 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.

[time-nuts] SR620 software and adjustment

Sorry, I don't want to annoy you, but I can't find the alignment/adjustment procedure for the SR620 - once, I had it... :-( I don's mean that in the manual, there must be another one Bob talked about. By the way: is there any suitable vindous software out there, for talking (and listening)

Re: [time-nuts] SR620 software and adjustment

, November 12, 2012 11:06 AM To: Discussion of precise time and frequency measurement Subject: [time-nuts] SR620 software and adjustment Sorry, I don't want to annoy you, but I can't find the alignment/adjustment procedure for the SR620 - once, I had it... :-( I don's mean that in the manual

Re: [time-nuts] SR620 software and adjustment

Volker: This is the adjustment procedure that I used: Use the following adjustment sequence to get the frequency spot on: 1. Set the Cal jumper to Cal Enable 2. Connect the reference to Ext Ref (rear) and Input A 3. Switch the counter to Ext Ref 4. Set the CalByte 50 for the best display (this

Re: [time-nuts] SR620 software and adjustment Ref queston

In step 2 is this my Lab Ref, or the SR620 ref out that is put into Ext Ref and Input A ? Thomas Knox Date: Mon, 12 Nov 2012 09:52:13 -0800 From: garn...@gmail.com To: time-nuts@febo.com Subject: Re: [time-nuts] SR620 software and adjustment Volker: This is the adjustment

Re: [time-nuts] SR620 software and adjustment Ref queston

: Mon, 12 Nov 2012 09:52:13 -0800 From: garn...@gmail.com To: time-nuts@febo.com Subject: Re: [time-nuts] SR620 software and adjustment Volker: This is the adjustment procedure that I used: Use the following adjustment sequence to get the frequency spot on: 1. Set the Cal jumper to Cal

Re: [time-nuts] SR620 software and adjustment Ref queston

-nuts] SR620 software and adjustment Volker: This is the adjustment procedure that I used: Use the following adjustment sequence to get the frequency spot on: 1. Set the Cal jumper to Cal Enable 2. Connect the reference to Ext Ref (rear) and Input A 3. Switch the counter to Ext Ref 4. Set

Re: [time-nuts] SR620 software and adjustment Ref queston

Hi Eric; That seemed logical, but I could imagine some topography where looping the signal may have made sense. Thanks Again; Thomas Knox Date: Mon, 12 Nov 2012 10:13:53 -0800 From: garn...@gmail.com To: time-nuts@febo.com Subject: Re: [time-nuts] SR620 software and adjustment Ref queston

Re: [time-nuts] SR620 VCTCXO replacement

unfortunately, the XO supply is limited to 100 mA. that's an awesome find though. I just snagged one. -Eric On Thu, Oct 25, 2012 at 12:59 PM, cdel...@juno.com wrote: Hi, Check this one out! I think it might work as long as the +5 volts can source the oven current required. Your part was

[time-nuts] SR620 VCTCXO replacement

I have an SR620 that I was preparing to sell. It's been clocked by an external 10 Mhz source for the whole time I've owned it so I wanted to verify that the internal VCTCXO was still up to snuff. after CALing the internal reference I set it up to monitor the output from my Tbolt and it started

Re: [time-nuts] SR620 VCTCXO replacement

and a small carrier board. Bob -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Eric Garner Sent: Thursday, October 25, 2012 11:36 AM To: Discussion of precise time and frequency measurement Subject: [time-nuts] SR620 VCTCXO replacement I

Re: [time-nuts] SR620 VCTCXO replacement

K1602TE (note the different part number) oscillators have been sold on ebay in the past. Keep an eye out there in case more appear. You could also contact the people who sold them and see if they have one or two more lurking in the corners. Other than that, it's just a TCXO that uses the

[time-nuts] SR620 VCTCXO replacement

Hi, Check this one out! I think it might work as long as the +5 volts can source the oven current required. Your part was 20ma. This one requires About 250 ma during warmup and between 80 and 130ma afterwards. http://www.ebay.com/itm/310380778466?ssPageName=STRK:MEWNX:IT_trksid=p39

Re: [time-nuts] SR620 VCTCXO replacement

Oh my, that looks like a good deal. I'll have to order a few. Regards, Tom - Original Message - From: cdel...@juno.com To: time-nuts@febo.com Sent: Thursday, October 25, 2012 3:59 PM Subject: [time-nuts] SR620 VCTCXO replacement Hi, Check this one out! I think it might work

[time-nuts] SR620 flicker.

I have a SRS SR620 that when an input channel is connected to the Ext Ref out has Flicker of about 3 digits of jitter/noise/drift. My experience is that most counter monitoring their external reference will be stable to one count with only an occasional larger jump. Magnus told me he has a

Re: [time-nuts] SR620 flicker.

Hi There is a fairly detailed calibration procedure for the SR620. I don't remember all the steps, but it does indeed reduce the reading jitter. Bob On Jun 9, 2012, at 11:49 AM, Tom Knox wrote: I have a SRS SR620 that when an input channel is connected to the Ext Ref out has Flicker of

Re: [time-nuts] SR620 flicker.

To: time-nuts@febo.com Subject: Re: [time-nuts] SR620 flicker. Hi There is a fairly detailed calibration procedure for the SR620. I don't remember all the steps, but it does indeed reduce the reading jitter. Bob On Jun 9, 2012, at 11:49 AM, Tom Knox wrote: I have a SRS SR620

[time-nuts] SR620 Floor Noise

Hello, My measurement technique is from Stanford's own application note. The two 10 MHz are fed to Ch A and B. The measurement is a time interval gated at 1 kHz from the SR620's ref out. So we make 1000 measurements per second. So the one shot 25 ps SR620 spec is reduced by square root of

Re: [time-nuts] SR620 calibration

Reed n0...@amsat.org Sent: Sunday, February 27, 2011 9:04 PM To: time-nuts@febo.com Subject: Re: [time-nuts] SR620 calibration Regarding the SR620 counters, I must have missed something It seems to me that SRS is providing about as much support as Tek or Agilent. All three offer PDF manuals

Re: [time-nuts] SR620 calibration

-louis.on...@obs-azur.fr - Original Message - From: J. Forster j...@quik.com To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Sunday, February 27, 2011 9:27 PM Subject: Re: [time-nuts] SR620 calibration And the schematics? I've tried without success

Re: [time-nuts] SR620 calibration

Hi All, From: Jean-Louis Oneto jean-louis.on...@obs-azur.fr I have a scan of the schematics (A3 format), but it is rather heavy (3.6MB); Do you know of a place to store such a beast ? Copy: http://www.on4jln.be/infos/manuals.shtml Bye, Jean-Louis

Re: [time-nuts] SR620 calibration

Jean-Louis, Thank you for the SR620 schematics. As soon as I have time I place them in the Test Equipment section of www.to-way.com Hadley K7MLR At 07:46 AM 2/28/2011, you wrote: Hi All, From: Jean-Louis Oneto jean-louis.on...@obs-azur.fr I have a scan of the schematics (A3 format),

[time-nuts] SR620

The downloaded manuals from SRS don't have the schematics, but if you buy a paper manual from them you get the schematics. (At least for the PRS10 and SR620) Corby Globe Life Insurance $1* Buys $50,000 Life Insurance. Adults or

Re: [time-nuts] SR620 calibration

Regarding the SR620 counters, I must have missed something It seems to me that SRS is providing about as much support as Tek or Agilent. All three offer PDF manuals and repair service. I doubt any of them have free telephone repair support for out-of-warranty products. I did a Google search

Re: [time-nuts] SR620 calibration

And the schematics? I've tried without success. Repairing hardware w/o schematics is pretty tough. -John === Regarding the SR620 counters, I must have missed something It seems to me that SRS is providing about as much support as Tek or Agilent. All three offer PDF manuals and

Re: [time-nuts] SR620 calibration

...@obs-azur.fr - Original Message - From: J. Forster j...@quik.com To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Sunday, February 27, 2011 9:27 PM Subject: Re: [time-nuts] SR620 calibration And the schematics? I've tried without success. Repairing

[time-nuts] SR620 Timing Capacitors

Going to the horses' mouth (hope I got the right end here...), timing capacitors (C701 and C711) in the SRS SR620 counter are 'Ceramic? 100pf? 100v? 5%? C0G'? radial lead capacitors. SRS apologized for any errors - although the part number is correct, the description in the parts database is

Re: [time-nuts] SR620 Timing Capacitors

Hello Jerry, Thanks for the addenda. I just updated my manual. Some day I will have a SR620... Stan, W1LECape Cod FN41sr gsteinb...@aol.com wrote: Going to the horses' mouth (hope I got the right end here...), timing capacitors (C701 and C711) in the SRS SR620 counter are 'Ceramic?

[time-nuts] SR620 Manual

Hi All, As mentioned in these earlier threads, the Stanford site does not include schematics in their online manuals. I have the online version of the manual for my SR620 but would love to have the schematics. I am getting ready to install the low phase noise SC10 as the high stability

Re: [time-nuts] SR620 Manual

[EMAIL PROTECTED] Sent: Dec 8, 2008 11:00 AM To: Discussion of precise time and frequency measurement time-nuts@febo.com Subject: [time-nuts] SR620 Manual Hi All, As mentioned in these earlier threads, the Stanford site does not include schematics in their online manuals. I have the online

Re: [time-nuts] SR620 Manual

Don @ True-Cal skrev: Hi All, As mentioned in these earlier threads, the Stanford site does not include schematics in their online manuals. I have the online version of the manual for my SR620 but would love to have the schematics. I am getting ready to install the low phase noise SC10 as

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