ben | 31 Aug 14:37 2014
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Datron 4920M, AC Voltmeter, for sale on ebay - 1 day left

Hello all,   
Just a heads up. I noted there is a lonely Datron / Wavetek 4920M AC 
voltmeter for sale on ebay, starting at US$650 (ending in 1 day !). I have 
little idea of its true working state or not (picture shows it powered on). 
If fully working it would be a good buy for an AC voltmeter that is, I 
reckon, better than an HP 3458A. Only drawback with these models is the 
voltage input shell is always earthed, not floating. I have two of these 
4920M's already, not really tempted by a third. I have a paper copies of 
operator, calibration, and service manual if anyone interested.   

regards,   ben. 
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Mark Sims | 29 Aug 20:28 2014
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Fluke 5200A extender board.

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. 		 	   		  
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Mark Sims | 29 Aug 19:53 2014
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Fluke 5200A extender board.

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. 		 	   		  
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Kgoodhew | 29 Aug 00:36 2014
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Fluke 5200a extender board.

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 detailed information about the extender board and how it is constructed
as he owns one, and it has been very helpful.
However if anyone has one they have no further need for I am willing to purchase it!! 
Ken Goodhew.

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Mark Sims | 29 Aug 00:03 2014
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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 interested in a 5200A extender cable?  Depending upon quantity,  looks like cost will
be in the $30 range (with edge connector). 		 	   		  
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Mark Sims | 28 Aug 19:09 2014
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Fluke 5200A extender board.

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.  OSHPARK.COM will
make you three boards for $5 per square inch.   You could either make a full hard-extender or do the ribbon
cable thing...  which would be fairly easy since the connectors are 0.1" spacing with wire wrap pins and
could plug two 50-pin ribbon cables directly onto the connector (with a little futzing where the two
connectors come together.  
I could try and make a small edge tab board and put it on OSHPARKs "shared projects" page where you could order
them from.  I would need to know the spacing of the edge of one of the end fingers to the edge of the board.  Would
also need to know the length of the edge tab. 		 	   		  
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Kgoodhew | 28 Aug 08:44 2014
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Fluke 5200A extender board.

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 a double sided pcb board that plugs into the female connector that is mounted vertically in the
instrument and then rises up above the top of the instrument case where there is a female socket mounted
horizontally so in effect the board now sits horizontally above the instrument whereas normally it sits
vertically in the instrument.
That way you have access to the board to take measurements, something you cannot do when the boards are in the
instrument due to the close spacing of the various boards.
	As the 43/86 pin card edge connectors appear unobtainable I have sourced a 50/100 pin female connector
that I can make do with, but I need either a 43/86 pin male card edge connector (which are also unobtainable)
to make up an extender using cables as you have done, so the only option appears to be to make up a double sided
pcb board with pads spaced at 0.1" centres on both sides and then either use it to terminate the cables to the
female socket , or probably better make the pcb the same as the original extender and just use my 100 pin
socket on that.
That is why I was hoping someone may be able to photo copy the pcb board if they have an extender they do not want
to sell.
Thanks,
Ken Goodhew.

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Mitch Van Ochten | 28 Aug 04:28 2014

Using a DVM to adjust a 752A divider

Folks,

Had some correspondence with Fluke a while back regarding adjustment of the
752A Reference Divider.  They no longer sell the 845AB Null Detector but
they have some suggestions on alternate meters to do the job.  They also
make reference to zeroing the inputs of the detector, which has been a hot
topic lately.  Here is the link:

http://www.ko4bb.com/Manuals/Fluke/Fluke_-_Using_a_DMM_to_balance_752A_Divid
er.pdf

Best regards,

mitch

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Mark Sims | 28 Aug 01:57 2014
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fluke 5200a extender board.

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.  I built up three of the TM500 cables and a GPIB extender cable.  They  work very well.  Just for
fun,  I tried running a few TM500 and TM5000  modules with 8 foot long extender cables...  no problems seen. 		
	   		  
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Ken Goodhew1 | 28 Aug 00:28 2014
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fluke 5200a extender board.

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 boards
out of the chassis.

                I managed to overcome this by running numerous test leads to
various points on the boards as I tested to enable me to take readings, but
I have now got down to what looks like a problem on the attenuator board
loading up the A7 power amplifier board and causing the +190 regulated
supply to drop.

                The most likely cause is suggested as more than one
attenuator path being selected at the same time, but I think it will be
virtually impossible to trace the logic signals on and being supplied to the
attenuator board without an extender board, so if anybody out there has one
they are willing to sell please let me know! 

Alternatively it would be a great help if somebody could supply me with a
full scale photo copy of both sides of the extender board so I can have a go
at making one of my own.

                The 43/86 pin card edge sockets are no longer available as
far as I can find out, the only company that lists any of them is Sullins
Connectors but they are out of stock as well, so I cannot envisage them
making any more in the near future, maybe somebody is parting out a 5200a?

                If I can make a pcb for the extender board then I think I
(Continue reading)

Steve - Home | 27 Aug 15:37 2014
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Re: AC calibration

Fred,

The 3458A is 8.5 digits, which puts it into the standards category. They are used as lab standards in many,
many labs. 

73,

Steve
WB0DBS

> On Aug 27, 2014, at 12:08 AM, <pa4tim <at> gmail.com> wrote:
> 
> Thanks, I did not new NIST has so much interesting information on their site. 
> 
> 
> 
> 
> I read the following on their site :
> 
> "multirange instruments with up to eight decimal digits of adjustability, are not considered by NIST to
be standards "
> 
> 
> 
> 
> Does that mean a HP3458 ? Fluke in the Netherlands used a HP-3458 and a 732 to calibrate the Fluke 5101 that 
I'm working on at this moment (it failed calibration due to some hardware faults) 
> 
> 
> 
(Continue reading)


Gmane