I got several inquiries when I mentioned I did a 5200A extender cable. I
didn't like my solution since it uses ribbon cables and there is +/- (300V?) on
some of the slots which is pushing what a ribbon cable can do, although it did
pass a test with a 1000V insulation tester.
There is a guy on
The HP 3455A had a much better AC section but it was a pain to cal.
HP work hard to make cal easy and settled for a weak AC converter so they
could do a closed case cal.
The 3455A, 3457A and 3458A all integrate at line frequency and all have a
better AC converter.
Integration is tied to line fre
Hi David,
I don't mind so much the journey, as I do being disappointed
in the performance of the HP3456A's AC section. DC and Ohms,
it is a wonderful DVM. AC, not so much.
Since it times its integrators to the power line frequency, it
is dooming itself to work stably only at those exact freque
ded to turn on the filter for <400Hz
signals.
Cheers
Dave
-Original Message-
From: volt-nuts [mailto:volt-nuts-boun...@febo.com] On Behalf Of Chuck
Harris
Sent: 27 August 2015 17:41
To: Discussion of precise voltage measurement
Subject: Re: [volt-nuts] Fluke 5200A instability... A resol
Back in July, I posted this note about a stability problem I
was having with my Fluke 5200A. I didn't get much response,
so I dove in with both feet.
The symptom was viewed on a trio of HP3456A 6-1/2 digit DVM's,
when measuring the 10V 60Hz output of a Fluke 5200A.
The 3456A's showed a 20mv off
Hi Tom,
That's an idea, but they didn't use any. They used a lot of tantalums...
a mix of the orange drop style, and the hermetically sealed axial leaded
variety. Some are operated disgustingly close to the voltage ratings...
and some are used in that suspicious back-to-back way of making an NP
Message -
From: "Chuck Harris"
To: "Discussion of precise voltage measurement"
Sent: Tuesday, July 28, 2015 11:35 PM
Subject: [volt-nuts] Fluke 5200A instability...
Before I spend a lot more time on it, does anyone have any experience
with the Fluke 5200A's feedb
Before I spend a lot more time on it, does anyone have any experience
with the Fluke 5200A's feedback loop oscillating when in the 100Hz band
position?
Mine started to oscillate at about a 1/2Hz rate a while back. It is two
to three orders of magnitude better when in the 1KHz and higher band
posi
;volt-nuts@febo.com"
Subject: [volt-nuts] Fluke 5200a extender
Message-ID:
Content-Type: text/plain; charset="iso-8859-1"
I recently bought a small insulation tester DMM off of Ebay ($20, search for
"bm500a insulation tester"). It can test at 250/500/1000V. I built up
I recently bought a small insulation tester DMM off of Ebay ($20, search for
"bm500a insulation tester"). It can test at 250/500/1000V. I built up three
of the 5200A extender cables and tested them. There were no problems at 1000V
(even though the ribbon cables are only rated for 300V and the
Hi There,
Any chance one of the members might have or know where I
might be able to buy an A7 power amplifier board for the Fluke 5200a
calibrator.
Ken.
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Had a look at the pin outs on both the power amplifier and the power supply
regulator boards and the maximum potential difference between any two adjacent
pins is 190 volts.
EG. +300 v to +190 v to 190v return to -190v to -300v on consecutive pins on
the power amplifier board.
A similar situatio
That would be me... I have the boards in and they probably work with all the
cards, but they scare me... Three of the 5200 boards have +/-300V and +/-
190V on some of the pins and I don't totally trust them to handle that
properly. The ribbon cable is rated at 300V and the box headers are
(
One of the members was getting some pcb's made to fabricate some extender
boards, has there been any developments yet?
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volt-nuts ma
Hi all,
1. Charles I looked at the item you mentioned on digikey but unfortunately it
will not do the job as the card extender has to sit vertically above the
instrument and plug into the main board socket which also sits vertically, also
the original card extender is almost 12" long by 3" deep,
Would that be at the maximum temperature? Service would be at room temp.
Sounds like a good excuse, right?
- Original Message -
From: "Mark Sims"
To:
Sent: Friday, August 29, 2014 2:28 PM
Subject: [volt-nuts] Fluke 5200A extender board.
Those are not holes... they ar
Learn something new every day. Thanks.
- Original Message -
From: "Mike S"
To:
Sent: Friday, August 29, 2014 2:27 PM
Subject: Re: [volt-nuts] Fluke 5200A extender board.
On 8/29/2014 2:16 PM, Tom Miller wrote:
Did you remove the two holes?
:)
You mean the two pin 1
Those are not holes... they are polarity markers on the silkscreen for the
connectors.
I do have one concern about doing the extender with ribbon cable. It is rated
for 300V and three of the card slots do have 300V on them.
_
On 8/29/2014 2:16 PM, Tom Miller wrote:
Did you remove the two holes?
:)
You mean the two pin 1 markers on the silkscreen?
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Did you remove the two holes?
:)
- Original Message -
From: "Mark Sims"
To:
Sent: Friday, August 29, 2014 1:53 PM
Subject: [volt-nuts] Fluke 5200A extender board.
5200A extender cables are a go! Connectors and boards are on order (from
a different board fab in Hong
5200A extender cables are a go! Connectors and boards are on order (from a
different board fab in Hong Kong this time). One board goes on each end of the
extender. Boards are connected by a 50 pin and 40 pin ribbon cable.
__
o.com
Subject: [volt-nuts] Fluke 5200A extender board.
Ok, I did a 5200A extender cable board layout. It has headers for a 50 pin
and 40 pin ribbon cable. One copy of the board would be on each end of the
cable, with the edge connector soldered to one of the boards.
So, how many people are inter
Hi all,
Thankyou to all who replied with suggestions and information about this
extender board,
I have looked up the surplus store as suggested and found they do have stock of
the 43/86 card edge connectors. Something I have missed in my searches.
Another contributor has given me
Ok, I did a 5200A extender cable board layout. It has headers for a 50 pin
and 40 pin ribbon cable. One copy of the board would be on each end of the
cable, with the edge connector soldered to one of the boards.
So, how many people are interested in a 5200A extender cable? Depending upon
q
There is also one listed on Ebay for $9...
http://www.ebay.com/itm/TRW-Cinch-50-86C-30-43-Pos-Double-Wire-Wrap-PC-Edge-Connector-New-Old-Stock-/171213916405?pt=LH_DefaultDomain_0&hash=item27dd2508f5
If you have access to a PCB layout program you can easily make the circuit
board/edge tabs. OSHPAR
" together which I
don't want to do.
I will do a PM to you with a pdf attached of the backside of the
extender.
Bill
- Original Message -
From: "Kgoodhew"
To:
Sent: Wednesday, August 27, 2014 11:44 PM
Subject: [volt-nuts] Fluke 5200A extender board.
> Hi,
Hi Ken,
Nigel is setting you on the right track with Vectorbord. I have used
them for the edge connectors over the years with good results. I don't
know if you are able to use Digikey of not but they list a 3690-26 ($80)
that will be easy to modify to work for your project. I probably
should
Hi Ken,
I don't know if it helps but there's a 43/86 edge connector offered here
for 14USD, (12USD for 5+)..
https://www.surplussales.com/ComputerAccess/con_edge.html
Single and double sided PCBs with 0.1 inch spaced strips were quite
common at one time as part of the Veroboard range
If it should help, most connector mfrs will make up a small run to order -
small typically meaning 30 or so.
If you are mega lucky (as I once was) you sometimes find they have one or two
hanging around (worth a telephone call) ...
Regards,
David Partridge
Hi,
The pin spacing on the card edge connectors is 0.1" (2.54 mm) and is a
43/86 dual row socket.
I know what the extender looks like as I found one on ebay several months ago
that had already sold for $50 (damm it!!) and I have been looking ever since,
but it had a picture of it.
It is
What is the pin spacing on the edge 5200a connector?
BTW, I got in my circuit boards for the TM500/5000 and HP5370 extenders from
China. They look great. I am now waiting for the rest of the edge connectors
to arrive. They have been shipped... from the US. Should be here in a day or
two.
Hi all,
Over the last 6 months I have been steadily repairing a
faulty 5200A that I brought, it had numerous faults in the power supply
regulator and power amplifier boards that I have managed to repair with a
lot of difficulty as I do not have an extender board to operate the boar
Hi Charles,
Thanks for the comments.
I have already lifted one end of R3 to isolate the input to the power
amplifier and the fault is definitely in the power amplifier board.
I have done quite a bit of thinking about the problem with the circuit in
hand to try and make sense of the voltage
Ken wrote:
Yes R6 changes the output of the op amp by about 15 mv..
During further investigation I found the input to Q1 was sitting at -400 mv
when it should be at 0 +/- 100uv.
Suggest lifting one end of R3 to isolate U1/Q1 from the oscillator.
Using the transistor tester I first tested al
, as well as making it
difficult to do measurements.
So when I have the board disassembled I will run some cables to allow me to
operate the board out of the chassis.
Ken.
Date: Sun, 13 Jul 2014 21:42:23 +1000
From: Gerd
To: Discussion of precise voltage measurement
Subject: [volt-nuts] Fluke
vary it by R6.
Will do some further checking today.
Ken.
Message: 5
Date: Fri, 11 Jul 2014 12:38:05 +1000
From: Gerd
To: Discussion of precise voltage measurement
Subject: [volt-nuts] fluke 5200a repair
Message-ID: <53bf4e0d.9030...@controlelectronics.com.au>
Content-Type: text/plain;
some further checking today.
Ken.
Message: 5
Date: Fri, 11 Jul 2014 12:38:05 +1000
From: Gerd
To: Discussion of precise voltage measurement
Subject: [volt-nuts] fluke 5200a repair
Message-ID: <53bf4e0d.9030...@controlelectronics.com.au>
Content-Type: text/plain; charset=ISO-8859-1;
to see if they may be leaking at a higher
voltage.
Thanks,
Ken
-
Message: 2
Date: Wed, 09 Jul 2014 14:21:13 -0400
From: Charles Steinmetz
To: Discussion of precise voltage measurement
Subject: Re: [volt-nuts] Fluke 5200A repair
Message-ID: <20140709222123.lmbgv...@smtp2o.mail.yandex.net&g
2014 14:21:13 -0400
From: Charles Steinmetz
To: Discussion of precise voltage measurement
Subject: Re: [volt-nuts] Fluke 5200A repair
Message-ID: <20140709222123.lmbgv...@smtp2o.mail.yandex.net>
Content-Type: text/plain; charset="us-ascii"; format=flowed
Ken wrote:
>R6 slide
maybe I am wrong.
Thanks again for your input.
Ken.
Message: 6
Date: Wed, 09 Jul 2014 22:19:46 +1000
From: Gerd
To: Discussion of precise voltage measurement
Subject: Re: [volt-nuts] Fluke 5200A repair.
Message-ID: <53bd3362.5030...@controlelectronics.com.au>
Content-Type: text/plain;
Oops! the divider ratio of R8/R9 is 2100, not 210.
Best regards,
Charles
Ken wrote:
R6 slider to U1 varies from +15v to -15v but the output of U1 only
varies by mv's, I put this down to the loading of R9 to earth on the input
to pin3 of U1 (221 ohm),only allowing a small variation to the
Ken wrote:
R6 slider to U1 varies from +15v to -15v but the output of U1 only
varies by mv's, I put this down to the loading of R9 to earth on the input
to pin3 of U1 (221 ohm),only allowing a small variation to the input on pin
3 of U1, maybe this needs further investigation!
Look at the circ
ge: 6
Date: Wed, 09 Jul 2014 22:19:46 +1000
From: Gerd
To: Discussion of precise voltage measurement
Subject: Re: [volt-nuts] Fluke 5200A repair.
Message-ID: <53bd3362.5030...@controlelectronics.com.au>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Hello Ken,
Glad to hear the
m
Subject: Re: [volt-nuts] Fluke 5200a
Message-ID: <53bb3ba7.2070...@controlelectronics.com.au>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Hello Ken,
From what I remember of this circuit, R26 is for output stage bias. R6 is
for adjusting offset. By the way, which voltages a
5200a (John Phillips)
--
Message: 1
Date: Tue, 08 Jul 2014 10:30:31 +1000
From: Gerd
To: volt-nuts@febo.com
Subject: Re: [volt-nuts] Fluke 5200a
Message-ID: <53bb3ba7.2070...@controlelectronics.com.au>
Content-Type: text/plain;
The problem is dc offset.
On Mon, Jul 7, 2014 at 5:30 PM, Gerd
wrote:
> Hello Ken,
>
> From what I remember of this circuit, R26 is for output stage bias. R6 is
> for adjusting offset. By the way, which voltages are high and how much?
>
> The 5200 is an old beast, expect a lot of marginal elect
Hello Ken,
From what I remember of this circuit, R26 is for output stage bias. R6
is for adjusting offset. By the way, which voltages are high and how much?
The 5200 is an old beast, expect a lot of marginal electrolytics, carbon
resistors that have drifted well out of tolerance and even tran
Hi all,
I am currently repairing a Fluke 5200a ac voltage
calibrator.
After pulling cards in and out and soldering multiple wires on to test I now
have the unit working about 98%.
Anybody might have or know of where I might be able to obtain an extender
card for this unit as it w
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