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 dielectr
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, a
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 a
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
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 ver
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
__
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 s
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 70
Sorry, this post went to wrong mailing list.
Frank
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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 0-10
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 7
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
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).
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 v
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
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
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time-n
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
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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=uken&pid=0
They still produce the best and most accurate DC calibrators and
standards, and to my biggest pleasure, the
> 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 ob
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
___
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 s
@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 s
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 Ca
ands, 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
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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
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