Mark Sims | 20 Oct 22:47 2014

732A rear panel battery connector

Yes,  I have laid out a pair of boards that has the battery module circuits on them.  One board plugs into the
mainframe (it has the thermistors on it) and the other has the rest of the circuitry.   I have not ordered them
yet... I need to buy the festoon lamp connector and have been waiting until I have to order some more parts
from Mouser.   What I didn't do is try and build the whole battery module with all the mechanical
parts/frame/etc.  I may laser cut a back panel piece, though,  out of acrylic. 		 	   		  
Charles Steinmetz | 20 Oct 15:23 2014

Re: 732A rear panel battery connector

Randy wrote:

>Does anyone have a spare connector plug for the 732A external battery
>*** ( I saw several in discussions but I'm not sure which is the best part
>number to use).

Back in March, I reported on my friend's adventure to get the contact 
bodies and contacts from Fluke.  The problem was, the designers of 
the 732A used male pin contacts in the panel receptacles and female 
socket contacts in the cable plugs -- backwards from the way they are 
used by every other user of those connectors (including the present 
Fluke users -- they are used in certain medical equipment).  Fluke 
understood the problem and told him they planned to create a new part 
number with the right components for the 732A, and would let him know 
what it was.

Having heard nothing since then, I asked my friend if he had heard 
back from Fluke.  He had not, so he called his Fluke contacts and was 
told that Fluke had decided not to catalog the plugs for the 
732A.  So, Kensington Electronics is probably the best source.

Best regards,


Randy Evans | 14 Oct 02:16 2014

732A rear panel battery connector

Does anyone have a spare connector plug for the 732A external battery
connector that they would be willing to sell.  Or conversely, a good Fluke
PN for the connector ( I saw several in discussions but I'm not sure which
is the best part number to use).


Randy Evans
acbern | 8 Oct 10:23 2014

Re: Old HP3458A - SN: 2823A 03939

the EPROMs are in sockets, no soldering needed.
but again, buying a precision instrument but reprogramming cal data that is years old does not make any sense.
unless of course if you are just a collector and do not use its accuracy.

> Gesendet: Dienstag, 07. Oktober 2014 um 16:35 Uhr
> Von: cfo <xnews5@...>
> An: volt-nuts@...
> Betreff: Re: [volt-nuts] Old HP3458A - SN: 2823A 03939
> I'm now the proud owner of a HP 3458A OPT-002.
> I have adapted Mark's 3458A CalRam program to use linux-gpib , and have 
> made backups of the calram , and the dataram.
> I will get a new calram : 
> And 2 x dataram : 
> I'll  get 4 x 32k SRAM for opt 001 - hopefully these are correct. 
> Does anyone know if the Eproms are already in sockets ?
> I was planning on installing sockets for the calram , datarams , but have 
(Continue reading)

Mark Kahrs | 7 Oct 22:25 2014

Banana jack probes for Fluke 8506A, etc.

What probes would you recommend for my Fluke 8506A?  I have some nasty ones
on right now, but it is telling me that I should be treating it better.
Todd Micallef | 29 Sep 02:09 2014

Fluke 732A pre-regulator revs

I wanted to pass on some information that may not have been previously

I just finished working on a 732A with minor issues. I replaced the R10 and
R20 pots on the A3 board just like on my other 732A's along with the two
big caps C1 and C3. After performing the same battery charger procedure
that I used on the other three references, I could not get the charger to
go from CC mode to CV mode. I checked the output charge voltage and it
never reached the 31V necessary to change to CV. The manual I used was PN

I went through the board and found four carbon comp resistors out of
tolerance (R3,R6,R15-16), but they didn't seem to be causing my problem. I
changed them anyway and decided to use the procedure in the other 732A
manual PN788414.

The other procedure differs only by the setting of R20. Instead of setting
it to 33V, I set it to 28.2V.
I looked at the schematics and noted that Fluke made some subtle changes to
the design. R17 and R18 were changed to CR29 and CR30. The RT1 thermistor
was also removed. R19 was added through an errata/change. R16 changed from
10K to 100K.

The newer procedure worked fine and I could watch the charger voltage
increase to 31V and then drop to CV mode.

I looked through my other three references. One other had the newer design.
A second one was modified and RT1 was removed. There was an additional 15K
resistor in parallel with R19 near the card edge connector. I removed it
since this resistor does not exist in the newer design.
(Continue reading)

J May | 27 Sep 20:31 2014

Solartron 7081 Calibration Key

Reading through the archives it appears that the calibration switch keys 
are not unique.

Can someone with a key tell me if the key blanks are a common size, and 
if they are would someone (preferably UK based) be prepared to send me a 
key so that I could get a copy made?

J May | 26 Sep 15:29 2014

Solartron 7081 Calibration

I need to have a Solartron 7081 calibrated - can anyone recommend 
someplace in the UK (or the EU)?

Unfortunately Ametek no longer provide a calibration service for the meter.

starbook | 25 Sep 18:01 2014

Fluke 845AB 1993 Modification Schematic

Need the schematic of the Fluke 845AB 1993 modification.
Kgoodhew | 25 Sep 06:33 2014

fluke 5200a extender

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 situation exist on the power supply regulator board, at no stage is there a 300 volt difference
between any two adjacent pins, so this should drop the possible arcing problem considerably
Ken Goodhew.

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Mark Sims | 25 Sep 04:32 2014

5200a extender

The tightest clearances are where an etch runs between two pin on the ribbon cable connector.  The connector
pin are spaced 0.10" apart.  The pads are .060" octagonal pads so edge-to-edge is a .04" gap.  A .016" trace
runs in that gap.  So there is a .012" clearance between the pad edge and trace.  Worse case would be 300V
bridging that gap,  but the Fluke edge connectors are set up so that (I think) the highest potential
difference is 190V (between the +/-190V lines and GND.   There is a possibility of +300V and a signal called
The layout/pad sizes could be tweaked some and that .012" gap could be increased to maybe .020"   A board
layout that didn't run etches between pads is not practical and/or would require a board size that exceeds
that permitted by my CAD program (or requires a $1700+ upgrade).  So what's the safe arc-over distance for
300V on a G10 circuit board?
The ATTEN,  PWR AMPL,  and PWR SPLY boards all have the high voltages on them... and they aren't on the same pins...