[time-nuts] HP 3420B calibration assistance

Hi Dick, I'm sure, I met the 3420B long time ago..that's a nice unit,.. but I do not have the schematics of the 3420B at hand, also did not find them on the agilent site, only the HP catalogue from 1970. The instrument - as far as I remember - compares the input voltage directly against

[time-nuts] HP 3420B..

Sorry, this post went to wrong mailing list. Frank ___ 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] HP 5335A Option 040

Hi, there exist three manuals, 5335-90005 - Serial #2024A and below, 1980, preliminary pdf manual on agilent.com 5335-90021 - Serial #2224A and below, 1983, pdf from Artekmedia, very good scan for $7.50 5335-90044 - Serial #3154A and below, 1994, very good reprint from manualsplus for about

[time-nuts] Faulty GPS SAT # 16 on Lady Heather

Once again, one of the 8 received satellites (#16) delivers no contribution to the time ensmble, although it got is over 40dbc strength. Lady Heather (beta 3.00) shows a hollow circle in the diagram, marked yellow in the list, and it has zero CLOCK BIAS and ACCU=0. Does anybody know, if that

[time-nuts] LCD monitor for TBolt

Dick, I also ordered an LCD monitor from fluke.l (beneath an LPRO Rubidium). For Lady Heather, do I have to add a switch between the monitor and the PC, or does the monitor have an additional RS232 port to feed through the PC communication automatically? Frank

[time-nuts] My old new 53132A just arrived

Bonsoir Loïc, and congratulations for your new, nice device. You should order the T.Bolt from fluke.l on e...y, standard easy kit with power supply and antenna, just working fine, The LCD monitor is also quite handy. You may also order an LPRO 101 Rb standard from him, so you have always a

[time-nuts] VRefs - I'm a bigger Voltnut than a timenut..

Hello, there's currently no easy way to convert a frequency into Volt, i.e. other than by cryo Josephson junction array or realizing Ohm by a Klitzing quantum hall effect device. Otherwise, FLUKE would have implemented that already in their Calibrators/Standards. They still rely on Artefact

Re: [time-nuts] VRefs - I'm a bigger Voltnut than a timenut..

@Bill Ezell: Well, I have the same motivation to invest time and money into precision. I started with metrology working in a German Airforce cal lab in 1980. We had all that goddie equipment, ie. a bank of Weston standard cells, the Fluke cal system, DCF receiver, a HP caesium standard, and so

Re: [time-nuts] Some pics of the Datron 491x DC reference cell

Bill, thank you very much for the schematics and the photographs! Using XP / firefox, I was able to retrieve the files with the given special link, and also very easily with the FileZilla Client. The most interesting part, i.e. the precision resistor circuitry, obviously resides on the bottom

Re: [time-nuts] Some pics of the Datron 491x DC reference cell

Bruce, good hint, I think you are right.. Then it's a custom specific R array, metal foil technolgy (S105 or similar) from Vishay, perhaps oil filled. Makes it very difficult to read the circuitry and design a replacement with discrete resistors. Frank

Re: [time-nuts] Some pics of the Datron 491x DC reference cell

NB use the latest datasheet which has a corrected schematic showing the location and polarity of the parasitic diodes. Bruce Thank you, I already got that... When I used the first datasheet, I reversed the heater as there was no hint, just to discover those hidden parasitic diodes. I

[time-nuts] OT: Basics of voltage calibration?

To John Ackermann! My recommendation for documents about DC-voltage-standards are the Fluke sites. Go to service/manuals, e.g.: http://www.fluke.co.uk/comx/manuals.aspx?locale=ukenpid=0 They still produce the best and most accurate DC calibrators and standards, and to my biggest pleasure,

[time-nuts] OT: Basics of voltage calibration? Fluke manuals

Chuck, try '341A', this manual covers the 343A also. (different beta string only) I've got the 5100, 5205, 5215 manuals from their site, perhaps something comes close to your 5200. Frank ___ time-nuts mailing list -- time-nuts@febo.com To

[time-nuts] OT: Basics of voltage calibration? Fluke manual 5200A

Chuck, I just have found the 5200A manual addendum here: http://us.fluke.com/usen/support/manuals/default.htm?prodcategory=OBS The others I mentioned are the power amps only. Fluke still scans on, so look for other manuals later. Frank ___

[time-nuts] New request for HP 3458A info

Hello Dick, .. internal overload: 72 might be caused by a failure on calibration, as '72' might refer to the 'dcv 10V gain' (see calibration manual p. 5-6). Either an ACAL failed, caused by interrupting this process, or an attempt to calibrate the internal 7V reference has gone wrong, also

[time-nuts] 3458A info

Dick, did you already try an ACAL DCV, or ACAL ALL from the front panel? Maybe the false cal constants will be set correctly. In the calibration manual, its explained, which constants are set by atocal (and cured), and which one are set by basic calibration, requiring external standards (10

Re: [time-nuts] Finding precision resistors, tip

I've also got a huge collection of TK 1 precision resistors from defect Fluke and HP / dy standards.. Great for building volt-standards as precision references, dividers, and also well-aged standard-resistors. Got several from the 1960s. AThey show absolutely no ageing any more, (I suppose).

[time-nuts] I think I've become a Volt nut too.

Hi All, I have been a time nut for some time now. I think I've become a Volt nut too! I build the Silicon Chip magazine Voltage reference late last year but didn't have anything to compare it against so I bought a Fluke 732A DC reference standard. I there a group I can subscribe to that

[time-nuts] I think I've become a Volt nut too.

True, but there is always a probability that they all happen to be off one way. Quite a small probability, but not impossible. Sorry for the disturbing thought. In the case of the 732A, and the early 732B, this is in fact the case! Fluke mentioned, that all the 732A and the early

[time-nuts] manual 5370A

Hola Jose, Well, I have uploaded the 5370A manual of 42MB last October to David's site, and it seems to be still there: http://www.g8wrb.org/data/HP/ (circuit diagrams are stitched for plotting on A1/A0 plotter.) There's a picture on p. 252 (8-93) of this 'A' unit, 3 PCB spares

[time-nuts] GC-1000 Clock Cap Choice?

Hi Brooke, Our electronics designers (@automotive electronics supplier) have to take lot of care concerning voltage stabilizers, that the cap provides sufficiently low ESR, which electrolytics deliver only at much higher capacitance value; and a series resistor is introduced to limit loading

[time-nuts] GC-1000 Clock Cap Choice?

Can you clarify one thing for me: When I studied datasheets for these it looked like they drop 50% of their capacitance at a DC voltage of 10-20V. Doesn't that make them a so-so bargain for power supply bulk capacitance ? Poul-Henning, Pls. check the spec for dielectric material. X5R is

[time-nuts] GC-1000 Clock Cap Choice?

I have found that such high dielectric constant capacitors have other problems in some circuits. While the capacitance value is dropping, as much as 50% when you apply voltage, their physical volume is changing. They behave as piezoelectric transducers. I have used them inappropriately,

[time-nuts] GC-1000 Clock Cap Choice

Sorry, epcos sold ceramics business, and was itself swallowed by TDK. If looking for X5R and X7R cer caps, visit vishay, kemet, taiyo yuden, murata and others instead. This special material specification is well hidden at the official manufacturers specs. Those are high grade ceramic

[time-nuts] HP5370B - 10 sec Gatetime via GPIB

, but nothing works. Has anybody got an idea how to program the HP5370B for a gate time up to the maximum of 10sec? Dr. Frank Stellmach ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts