On 8 August 2013 18:58, John Phillips wrote:
> You will find that most old "stuff" does not drift as much as the new
> "stuff".
> Most resistors seem to drift in a damped sine wave rate with a period of
> about 4 years.
Is there any theory behind that? It's the first time I have heard of
the 4 ye
On 11 August 2013 10:23, Charles Steinmetz wrote:
> Orin wrote:
>
>> They send a calibration certificate which claims that their standards are
>> traceable to NIST. I have no reason to doubt that.
>
>
> Owning standards and instruments with traceable calibrations is necessary
> but not sufficient
On 11 August 2013 03:19, Joseph Gray wrote:
> If I want to buy a used 3457A, is it better to buy one "as-is" and send it
> for calibration, or perhaps spend a bit more and get one already
> calibrated? Just one example:
>
> http://www.ebay.com/itm/HP-3457A-6-5-Digit-Lab-Quality-Front-Terms-Fully-R
On 11 August 2013 15:39, Robert Atkinson wrote:
> On a related issue to the 3457A calibration, I was asked to review an item at
> work last week (sorry can't say what or why). Looking at compliance
> certification by two fully qualified, internationally recognised labs, all
> looked well until
On 12 August 2013 01:58, Charles Steinmetz wrote:
> David wrote:
>
>> How useful is this
>>
>> http://www.ebay.com/itm/281149723636 ?
>>
>> On the fact of it, the device would give one a reasonly high
>> confidence something is working readlably well. I wonder if that is
>> good enough for a 3457A
On 11 August 2013 05:10, Orin Eman wrote:
> Well, lets discuss the 3456A I got from goldenrubi, calibrated. They send
> a calibration certificate which claims that their standards are traceable
> to NIST. I have no reason to doubt that. The list of standards used is
> reasonable for a 3456A.
I
On 11 August 2013 22:34, Charles Steinmetz wrote:
> Orin wrote:
>> BTW, they don't list any accreditation on the certificate.
>
>
> As I suspected. So it is vanishingly unlikely that they do traceable
> calibrations, contrary to their claim.
I see a lot of sellers selling things on ebay which a
On 12 August 2013 17:43, Mike S wrote:
> On 8/12/2013 12:21 PM, Charles Steinmetz wrote:
>>
>> No, you could not perform ANY traceable calibration with the 3458A
>> itself, much less with any instrument you had calibrated with the 3458A,
>> because *you* are not accredited
>
>
> That's simply not
On 14 August 2013 04:39, Orin Eman wrote:
> Take a look at: cp.literature.agilent.com/litweb/pdf/5989-5729ENA1.pdf
>
> It's well hidden on the Agilent web site, but if you dig enough, you'll
> find it.
>
> You should get the "As Received" data for all Agilent calibrations. You
> only get the "As
On 14 August 2013 06:41, Charles Steinmetz wrote:
> Joe wrote:
>
>> The way I read this is that if I send them a DMM that is within spec, they
>> won't adjust it or provide pre/post data. Is this the case? If I spend
>> over
>> $200 sending a DMM to them, I want it adjusted to the best possible sp
My HP 8720D VNA went off to Agilent yesterday. I know it is not
volt-nut related, but if anyone wants to look at the certificate when
I get it back, you are welcome to. I intended scanning it anyway. But
I noticed something interesting looking at the prices of various
calibrations in the UK and US
On 20 August 2013 02:59, J. L. Trantham wrote:
> Interesting video.
A bit of a silly video IMHO. I can't take anyone seriously who
measures the noise on a 6.5 digit multimeter by looking at the digits
which change as it is across his standard bench power supply.
Personally I would have thought on
On 20 August 2013 14:51, J. L. Trantham wrote:
> If the battery is 'OK', I would favor just sending it to Agilent for
> calibration, unless you can 'SAFELY' change the battery while preserving the
> cal data.
>
> Good luck.
>
> Joe
If one accepts there is some risk changing the battery while
pres
On 20 August 2013 15:27, Rob Klein wrote:
> Good video for when I can't get to sleep, though
Yes, it does really drag on. He could say what he has to say in 25% of
the time, by cutting out all the irrelevant rubbish.
Dave
___
volt-nuts mailing lis
On 20 August 2013 17:14, Joseph Gray wrote:
> I have replaced this type of battery in other equipment, so it isn't a big
> deal for me. I'm sure I can do it without losing the cal data.
>
> Joe Gray
> W5JG
Given the discussion on here a week or two ago about Agilent not
adjusting something if it
Since there has been a few discussions about calibration, and in
particular Agilent calibration, I thought I'd share my calibration
certificate for my VNA which came back from Agilent (UK) last week.
http://sage.math.washington.edu/home/kirkby/Agilent-standard-calibration-with-uncertainties-for-87
On 24 August 2013 18:55, Joseph Gray wrote:
> David,
Hi Joseph
> That is quite a difference between the two certificates. The Techmaster one
> doesn't tell you anything about what they actualy measured, or the
> uncertainties. You have to trust that they know what they are doing and
> that they
Some time back I needed to purchase some caps to cover RF connectors.
Despite only wanting a couple of hundred of each, I was unable to get
small quantities, so had to buy either 2500 or 5000 of each, so I have
a few to spare. If anyone wants to cover their plugs and sockets to
stop dirt and damage
I forgot to add. There are some pictures on eBay of these, but I'm
selling them cheaper off of eBay, but you can see the pictures with
the various connectors. (No PL259 or S0239 shown, but they do fit. I
had to hunt hard to find such connectors here)
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem
On 18 Jan 2014 14:38, "Joe Hobart" wrote:
> Does anyone have or know where I can buy or borrow a 12/24 contact
> extender card
> for the Guildline 9975? I have a single sided extender, but the signal
> demodulator board requires a double sided extender. Of course, it is this
> card
> that needs
On 18 January 2014 21:15, Bill Gold wrote:
> I did have a display that was going dim on one digit so I ordered a new VFD
> display from Agilent, not the whole board just the actual display. When I
> compared it to the original I found that the top to bottom distance between
> the pins was larger
On 8 Mar 2014 05:57, "Charles Steinmetz" wrote:
>
> Michael wrote:
>
>> The battery is big concern to me. When I called Fluke, one of the rep
said it should be shipped to them "hot" Because 732A's battery life is very
limited, it should be shipped using Morning Service. I was going to call
FedEx i
On 8 March 2014 21:44, Dallas Smith wrote:
> Hi nuts,
> This is my first post. The knowledge from contributors is amazing.
>
> Was wondering where one could economically get our voltage standards
> calibrated
> to some traceable standard since Joe Gellar suspended operations for his
> SVR-T?
>
>
On 9 Mar 2014 23:39, "Jan Fredriksson" wrote:
>
> I have a batch of voltage references ICs on the shelf, several thousand of
> each type. They all have date codes of around 1983, ie 30 years old. It
> would be great to have some drift data on them.
Since you have so many, it would be interesting
Original message
From: Poul-Henning Kamp
Date:20/10/2016 00:08 (GMT+00:00)
To: Discussion of precise voltage measurement ,"Dr. David Kirkby (Kirkby
Microwave Ltd)"
Subject: Re: [volt-nuts] Is there a "standard" much better than a LTZ1000, but
Original message
From: Mark Sims
Date:30/10/2016 01:06 (GMT+00:00)
To: volt-nuts@febo.com
Subject: [volt-nuts] low emf solder
> Once you get past 99.99% purity funny things begin to happen... I have some
> 100% pure Cu oxygen free cable (says so right on the jacket) made
On 14 January 2018 at 15:40, David C. Partridge <
david.partri...@perdrix.co.uk> wrote:
> I've recently rebuilt a 732A and it seems stable, but what I don't know is
> its actual output voltage down to the last ppm
>
> I've also acquired a Guildline 3330 10K standard resistor but again don't
> know
ysight, I pay the calibration cost, but if it fails, I get a full refund,
including the calibration cost.
I can understand a meter going out of spec over time, but if it can't be
sorted out without thousands of dollars spent on it, then it is not such a
good buy. But are more than 50% of 3458As l
On 16 January 2018 at 05:01, John Phillips wrote:
> my experience is that most of the eBay meters that do not give errors are
> very close to spec. These old meters do not drift as much as a new meter.
> If you have a good 10 volts and 10k resistor calibration is a snap...
> verifying cal in not
On 16 January 2018 at 13:44, Dr. David Kirkby <
drkir...@kirkbymicrowave.co.uk> wrote:
> Maybe an Agilent meter might be a sweet spot - not as old as an HP, so but
> less stable than a newer Keysight.
>
> Dave
>
I meant to say, maybe an Agilent meter would not have the relia
Dave
Dr David Kirkby Ph.D C.Eng MIET
Kirkby Microwave Ltd
Registered office: Stokes Hall Lodge, Burnham Rd, Chelmsford, Essex, CM3
6DT, United Kingdom
Registered in England and Wales as company number 08914892
http://www.kirkbymicrowave.co.uk/
Tel 01621'680100 / +44 1621-680100
On 16 Januar
On 16 January 2018 at 17:33, Dr. Frank wrote:
> I meant to say, that the ADC ASIC determines crucially the stability.. and
> this special serial number US28032500 is eventually affected by the AN-18
> service note. So that may be the reason, why they claim 2100$ for repair,
> i.e. replacement of
On 16 January 2018 at 23:06, Dr. Frank wrote:
> Surely the AC errors if any must be associated with the A2 AC Convertor
>>> board - 03458-66502? >> Dave
>>>
>>
> Why should this be a hardware error???
>
> It's much much more probable, that this is a natural drift phenomenon.
> This is 'as found'
t paid
for calibration on another instrument, and Keysight will update the
firmware for no extra charge.
Dr David Kirkby Ph.D C.Eng MIET
Kirkby Microwave Ltd
Registered office: Stokes Hall Lodge, Burnham Rd, Chelmsford, Essex, CM3
6DT, United Kingdom
Registered in England and Wales as company numbe
I bought an HP 4339B high resistance meter. It is designed to measure high
resistances (as the name suggests) and also low currents. It is essentially
a variable voltage source up to 1000 V, and a low current ammeter.
I got it from eBay, as non-working, with no output voltage. After paying
for it,
t this meter, just in case
Keysight are wrong. I know they should not be, but it is not a current
instrument, so it's just possible the engineer did not know it could be
adjusted.
Dr David Kirkby Ph.D C.Eng MIET
Kirkby Microwave Ltd
Registered office: Stokes Hall Lodge, Burnham Rd, Al
On 2 March 2018 at 09:22, Andre wrote:
> Maybe one bad resistor? I've read that tin whiskering can occur even on
> relatively recent equipment, slower than lead free but still a problem.
> I'd do a visual inspection just to see, shouldn't be an issue.
> -A
>
An issue with fingerprints would not
Sorry this is not precision voltage measurement, but it is not unrelated.
As a radio club project, we are building a simple electroscope, with no
active components. The gold leave variety would work, but two bits of
alluminum foil do too.
My plan was to go one better, and build a Bohnenberger ele
On 7 March 2018 at 06:29, Andre wrote:
> Please be VERY VERY careful. To be honest its far safer to use CCFL
> drivers and rectify them with camera diodes in series and the absolute
> minimum capacitance for the job, shunted with a high value resistor.
>
The problem with 2.2 nF is it is difficul
On 8 March 2018 at 07:19, Andre wrote:
> Hi, re. capacitors it might be worth mentioning that the normal equation
> assumes charge and discharge through a constant current.
>
What 'normal equation' do you mean?
> Don't forget that the equation includes a non linear term so you'll need
> to tak
On 6 March 2018 at 09:40, Dr. David Kirkby
wrote:
> Sorry this is not precision voltage measurement, but it is not unrelated.
>
> As a radio club project, we are building a simple electroscope, with no
> active components. The gold leave variety would work, but two bits of
> al
istance on the 200 mV
range, and there's no way that can be measured with an ammeter, which would
require an ammeter with a full scale deflection of 1 fA, which is much
smaller than the 2 pA FSD on its most sensitive range.
Any thoughts?
Dr David Kirkby Ph.D C.Eng MIET
Kirkby Microwave Ltd
Re
On 23 March 2018 at 01:07, Bob Albert via volt-nuts
wrote:
> I found several electrostatic voltmeters on ebay. The brand I remember
> is Sensitive Research.
> Bob
>
So something like this?
https://www.ebay.com/itm/Singer-ESD-7-Sensitive-Research-Electrostatic-Voltmeter-1500-Volt-Range/1229764
On 23 March 2018 at 01:37, Jerry Hancock wrote:
> The part I struggle with is “make one” as T ohm meters are ridiculously
> sensitive to things like fingerprints, for example. I had a hard time just
> putting cables together that had the particular… I was going to say
> insulation, but it was mo
On 23 March 2018 at 01:49, kc9ieq via volt-nuts wrote:
> How about using (or building) an additional 2kV power supply and a
> sensitive meter movement like a differential voltmeter, adjusting
> for/measuring the null? Impedance at null will be theoretically infinate,
> current will be theoretica
On 23 March 2018 at 18:49, ed breya wrote:
> I'm guessing the application relates back to your leaf electrometer
> project discussed earlier - trying to assess how the bias charge on the
> capacitor holds up from leakage and use of the instrument.
Yes it is.
If this is the case, then it's for
On 23 March 2018 at 15:27, Jerry Hancock wrote:
> what others do is just buy the available Trompeter triax connector and
> file-off the host connector pins. I went through all the trouble to get
> the right connectors and then looked at my Electrometer and saw someone had
> already filed off the
On 24 March 2018 at 17:34, Jeremy Nichols wrote:
> I made a high-value resistor using motor oil and a couple of stainless
> bolts. It worked for what I was doing (testing an HP-425A
> Microvolt-Ammeter) but calculated as only 8,500 Megohms.
>
> Jeremy
>
I had some discussions some time ago about
NPL opens their doors to the public once every 2 years. It is well worth
going. Tickets are only 3.00 each, and that money is donated to a cancer
charity. More details at
http://www.npl.co.uk/open-house/
To make the most of it, you need to
1) Arrive early (14:00)
2) Leave when they close (20:00)
On 3 Apr 2018 22:12, "Jeremy Nichols" wrote:
>
> Man, that would be wonderful! Pity the flight from California to the U.K.
> is considerable more than £3!
>
> Jeremy
> N6WFO
Yes, its a shame that the plane ticket is not cheap. Perhaps you could
consider a holiday to the UK to coincide with the f
There seems to be plenty of evidence that meters like the 3458A improve
stability over time. I believe that most/all is due to improved stability
of the LTZ1000A.
Does anyone know if desoldering one and resoldering resets the aging
process? I see a number of used LTZ1000A ICs on eBay from China th
There seems to be plenty of evidence that meters like the 3458A improve
stability over time. I believe that most/all is due to improved stability
of the LTZ1000A.
Does anyone know if desoldering one and resoldering resets the aging
process? I see a number of used LTZ1000A ICs on eBay that look lik
of the resistors used for
calibration.
Dave
Dr David Kirkby Ph.D C.Eng MIET
Kirkby Microwave Ltd
Registered office: Stokes Hall Lodge, Burnham Rd, Althorne, CHELMSFORD,
Essex, CM3 6DT, United Kingdom.
Registered in England and Wales as company number 08914892
http://www.kirkbymicrowave.co.
On 19 April 2018 at 16:42, wrote:
> -a calibration certificate without uncertainsties is totally useless. in
> is not even a calibration.
>
Having bought the meter, it is not so useless if it tells me it is working
or not, but I do have some concerns I must admit.
> -I have never understood wh
o be
calibrated.
To be honest, I don't really NEED the uncertainties, but the fact they
can't provide them does concern me a bit.
Dr David Kirkby Ph.D C.Eng MIET
Kirkby Microwave Ltd
Registered office: Stokes Hall Lodge, Burnham Rd, Althorne, CHELMSFORD,
Essex, CM3 6DT, United Kingdom.
R
On 21 April 2018 at 09:32, Florian Teply wrote:
> Am Fri, 20 Apr 2018 14:37:22 +0100
> schrieb "Dr. David Kirkby" :
>
> > The columns below, from left to right are
> >
> > Device type (whether the DUT is floating, or grounded one side).
> > Resistor se
On Tue, 24 Apr 2018, 05:37 Florian Teply, wrote:
> probably I didn't get my wording precise. Just as you say, it looks
> like they assume the resistors should have nominal value. Otherwise
> they would need to list what they assume to be the nominal value, which
> they don't. I was referring to t
On 29 April 2018 at 21:57, Nigel Clarke via volt-nuts
wrote:
>
> Sorry, I realise now I could have explained better, I do know what
> transistor it is but that's not the problem, this looks to be quite a
> complex power suply/charger circuit, with at least three unmarked
> adjustment pots so if I
On 30 April 2018 at 10:45, Nigel Clarke via volt-nuts
wrote:
> -Original Message-
>
> From: Dr. David Kirkby
> To: gandalfg8 ; Discussion of precise voltage
> measurement
> Sent: Sun, 29 Apr 2018 22:18
> Subject: Re: [volt-nuts] Cropico DO4A Digital Ohmmeter
&g
I"m pulling my hair out over an identical problem on two instruments. I am
hoping someone might think of a possible cause I have not thought of. Sorry
the post is a bit long, but this is not any easy problem to describe.
I have an Agilent 4339B high resistance meter. This instrument essentially
co
On 2 May 2018 at 10:37, David C. Partridge
wrote:
> My bet is that they've lost the "secret sauce" for updating the EEPROM :(
> So it's measuring as best it can with no calibration adjustments stored.
>
> Dave
>
Dave,
Your comment got me to check something, which reveals something VERY
interest
On 2 May 2018 at 14:25, wrote:
> "This reflects my experience when using
> it to measure close tolerance resistors - measuring them at low voltages
> gives poor results, but at higher voltage, the resistances are measured
> more accurately."
>
> I noticed similar results in general, over years ad
On 2 May 2018 at 18:27, Charles Steinmetz wrote:
> Dave wrote:
>
> This has certainty got me thinking about what might be happening, although
>> the fact Keysight have said they can't update the EEPROM, suggests they
>> have the software to do it.
>>
>
> Or does it mean they have lost the softwar
On Mon, 30 Apr 2018, 20:02 , wrote:
> Leeds and Northrup Ayrton Shunt box Model 2664.
>
> Modified to do double duty as a precision resistor standard.
I must admit I don't know what the purpose of the original unit is. Perhaps
as part of a bridge given the galvanometer connections.
I know when
On Wed, 2 May 2018, 18:28 Charles Steinmetz, wrote:
> Dave wrote:
>
> > This has certainty got me thinking about what might be happening,
> although
> > the fact Keysight have said they can't update the EEPROM, suggests they
> > have the software to do it.
>
> Or does it mean they have lost the s
provide 128 kb is to use old chips, as new ones are too large!
Dr David Kirkby Ph.D C.Eng MIET
Kirkby Microwave Ltd
Registered office: Stokes Hall Lodge, Burnham Rd, Althorne, CHELMSFORD,
Essex, CM3 6DT, United Kingdom.
Registered in England and Wales as company number 08914892
http://www.kirkbymicro
On 14 May 2018 at 13:01, Dr. David Kirkby
wrote:
> I'm puzzled why option 002, an upgrade of memory to 128 kb, is still an
> option one has to pay for. With the cost of RAM what it is now, I'm
> suprised the memor is not not standard. Perhaps the only way Keysight can
> pr
not find a suitable battery in the UK, and
those in the US could not be shipped here. But that was a few years ago, so
maybe things are different.
Dr David Kirkby Ph.D C.Eng MIET
Kirkby Microwave Ltd
Registered office: Stokes Hall Lodge, Burnham Rd, Althorne, CHELMSFORD,
Essex, CM3 6DT, United Kingdom.
Reg
Last year I went down to Keysight for a course, and got a tour of their cal
labs. I spoke to the person showing us around about the 3457A battery. He
said if the battery was less than £35 or so, it could be replaced free of
charge when the instrument was calibrated.
So despite my 3457A's battery m
On 24 May 2018 at 23:43, Laurence Motteram <
lmotte...@scientific-devices.com.au> wrote:
> Hello Dave,
>
> Farnell UK have these; http://uk.farnell.com/w/c/
> batteries-chargers/batteries-non-rechargeable?battery-size-code=2-3aa
>
>
> Best Regards,
>
> Laurence Motteram
> Calibration & Service Man
On 24 May 2018 at 21:41, Dr. David Kirkby
wrote:
> Last year I went down to Keysight for a course, and got a tour of their
> cal labs. I spoke to the person showing us around about the 3457A battery.
> He said if the battery was less than £35 or so, it could be replaced free
> of cha
On 6 Jul 2014 07:12, "John Phillips" wrote:
>
> They do really offer that service as long as you send them a complete
> meter... No missing parts. Well they will take a few missing screws and
> such.
There is also the possibility someone has tried repairing it, but done so
badly.
I assume that
I am looking to measure as accurately as possible the DC resistance of a
number of types of RF loads - all around 50 Ohms. Types of interest include
SMA, 3.5 mm, N, APC7, 7-16 & BNC. I want to see if the difference between
the actual resistance at DC and 50 Ohms correlates with the performance at
R
On 18 Dec 2014 19:06, "Poul-Henning Kamp" wrote:
>
>
> In message <5492f59e.8060...@free.fr>, Joel Setton writes:
>
> >In my search for the Perfect Volt, I'm thinking about building a
> >reference voltage generator which would average the voltages generated
> If you want to do it "right"
On 19 Dec 2014 19:30, "Jan Fredriksson" wrote:
>
> It's no coincidence that virtually all 8.5 digit DMMs use the LTZ1000.
> It's in a class of it's own.
What do the 8.5 digit meters use if they don't use the LTZ1000?
Dave.
___
volt-nuts mailing list --
On 20 Dec 2014 21:18, "Joel Setton" wrote:
>
> Jan,
>
> Thanks for a good summary f the pros/cons. Of course the LTZ1000 is much
closer to the current state of the art, but the REF102 is far easier to use
and to calibrate. I'm definitely not shooting for sub-ppm performance, if I
can build anythin
On 22 Dec 2014 08:51, "Joel Setton" wrote:
>
> Frank (and all!),
>
> These are all very valid questions.
>
> The context is a hobby activity, and the purpose of the reference voltage
is to have something which is good enough to calibrate, for example, a
30-year old DVM after restoring or repairing
On 5 Jan 2015 15:36, "Randy Evans" wrote:
>
> This is indirectly pertinent to the group since I am designing a PCB for
> the HP-419A and Fluke 845A modifications. Does anyone have any
> experience/comments on the Design Spark PCB design package? Is is a
viable
> package for hobbyist use?
>
> tha
On 27 January 2015 at 09:16, Orin Eman wrote:
> There is a seller letting a slow trickle of them out there... they seem to
> be going for about $165. The current batch of two is around $100, but will
> probably be bid up.
>
> I just received one that I won. Seems to be working fine after a quick
On 28 January 2015 at 18:56, Charles Steinmetz wrote:
> The problem is that an LTZ1000 (or LM399) runs hot enough that most plastics
> you find lying around won't stand up to it for very long (some of them melt
> almost immediately when you power it up). This is true even of
> polycarbonate, whi
On 27 Jan 2015 09:47, "Orin Eman" wrote:
>
> There is a seller letting a slow trickle of them out there... they seem to
> be going for about $165. The current batch of two is around $100, but
will
> probably be bid up.
I am puzzled why there are so many reference boards that are supposed to
come
On 30 January 2015 at 12:25, Will wrote:
> The boards are factory rejects.
I doubt all boards on eBay are in this category. Some are probably
quite genuine, some may be rejects, and it would never surprise me if
some are counterfeit. The problem is, I have no idea what ones are
what.
I don't kno
I have bought an HP 4284A precision LCR meter. This is an old model with a
basic accuracy of 0.05% and covers 20 Hz to 1 MHz.
Converting the specifications into determining the uncertainty of a
measurement is nontrivial, but I think it reasonable to assume the
uncertainty will always be >0.05%.
S
Google that and you should find a seminar sponsored by Keysight,
scheduled for Tuesday, April 14, 2015 1:00pm ET / 10:00am PT (I'll
convert to GMT later)
Trouble is, it is streamed in a Windows format.
Dr. David Kirkby Ph.D CEng MIET
Kirkby Microwave Ltd
Registered office: Stokes Hall
nning something else that
interests me on the 17th June
http://www.keysight.com/main/eventDetail.jspx?cc=US&lc=eng&ckey=2548118&nid=-33166.920244.08&id=2548118&cmpid=1-6830540895
with the two locations more than 200 miles apart. It makes it just
about impractical to attend both
I have bought some resistors of 0.1, 1.0, 10, 100, 1k, 10k & 100k Ohms.
These are in little boxes with 4 BNC connectors spaced 22 mm apart.
This sort of thing
http://m.ebay.co.uk/itm/231460477406
although I paid a *lot* less.
They are designed for use verifying the performance of LCR meters. I
uch. Luckily I don't need to satisfy anyone else.
Dr. David Kirkby Ph.D CEng MIET
Kirkby Microwave Ltd
Registered office: Stokes Hall Lodge, Burnham Rd, Althorne, Essex, CM3 6DT,
UK.
Registered in England and Wales, company number 08914892.
http://www.kirkbymicrowave.co.uk/
Tel: 07910 441670 /
On 20 August 2015 at 02:38, Todd Micallef wrote:
> Here is a DIY guide to making some lab standards. It is detailed with some
> component values.
>
>
> http://nopr.niscair.res.in/bitstream/123456789/4848/1/JSIR%2065%286%29%20510-513.pdf
>
>
If this was April the first, I would be convinced that
I just got my LCR meter back from Keysight today.
For anyone interested in looking at the cal certificate, which includes the
uncertainties, a copy may be found here,
http://www.kirkbymicrowave.co.uk/cal_certificates/Keysight-standard-calibration-with-uncertainties-for-4284A-precison-LCR-meter-18
On 20 August 2015 at 19:11, Brooke Clarke wrote:
> Hi Dave:
>
> I'd classify this article more like pseudoscience than April's fool. To
> get an idea of the quality of the paper just check out the publisher.
>
Yes, the publisher does seem dubious. If Wikipedia is to be believed, they
were willi
On 20 August 2015 at 02:38, Todd Micallef wrote:
> Here is a DIY guide to making some lab standards. It is detailed with some
> component values.
>
>
> http://nopr.niscair.res.in/bitstream/123456789/4848/1/JSIR%2065%286%29%20510-513.pdf
>
OK, I tried this.
I was hoping to use a box I had with
inductor changes to less than
> >> 0.005% over a year, so the inductor is an order of magnitude better
> >> than the meter. Maybe that is not practical. As I say, the absolute
> >> value is not important, since I only want a comparison.
> >>
> >> The cal
I just sent an email by mistake, failing to finish it before hitting
"send".
The recent discussion about creating inductor standards from a capacitor
and two resistors got me thinking. I suspect if you connected up an HP (or
similar) LCR meter in a way not intended, you could make it appear you ha
On 13 Sep 2015 09:15, "M K" wrote:
> There has been some of those references available second hand from ebay,
mostly pulled, but some may be counterfeit, so look for sellers with
pictures showing it as old..
Several sellers have more than 1, but with one photo, so you would have a
hard time argui
On 25 Nov 2015 11:18, "Charles Steinmetz" wrote:
>
> I'm curious why you think the AD587/586 are better than other
hermetically packaged references with better drift and noise specifications
-- in particular,
>
> MAX6350MJA
> AD588KQ
> LTC6655CHLS8
> LTC6655BHLS8
> REF102CM
>
> (see attached tabl
On 29 November 2015 at 10:53, Charles Steinmetz
wrote:
Dave wrote:
>
> As regards humidity, I wonder if an reasonable attempt at sealing a package
>> combined with silica gel inside would give an internal humidity that keeps
>> fairly stable.
>>
>
> That is exactly what I do. I typically package
ly happy about fitting a higher
voltage battery than it is supposed to have, but phyysically it fits, and I
can get one easy enough from Farnell in the UK.
Dr. David Kirkby Ph.D CEng MIET
Kirkby Microwave Ltd
Registered office: Stokes Hall Lodge, Burnham Rd, Althorne, Essex, CM3 6DT,
UK.
Registered in E
On 24 January 2016 at 21:24, Poul-Henning Kamp wrote:
>
> In message <
> canx10hadbw1u9ejc8_zgsk94k8az8vzg4ose+xngfwrali0...@mail.gmail.com>
> , "Dr. David Kirkby (Kirkby Microwave Ltd)" writes:
>
> >Opening the meter up, I see the PCB shows "BT
On 24 January 2016 at 22:16, Poul-Henning Kamp wrote:
>
> In message <
> canx10hcknsnxczjx8gccd2-t0j-jom7ybmncgdvis9ic3yv...@mail.gmail.com>
> , "Dr. David Kirkby (Kirkby Microwave Ltd)" writes:
>
> >The SRAM actually gets about 4.8 V
> >whe
On 24 January 2016 at 22:46, Poul-Henning Kamp wrote:
>
> In message t305g+...@mail.gmail.com>
> , "Dr. David Kirkby (Kirkby Microwave Ltd)" writes:
>
> >Thank you. That is certainly important if that's the case. I can't seem to
> >
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