I have reviewed the prior postings on Volt-nuts (a very rewarding review,
BTW)) regarding the 732A and have two questions:

1.    Has anyone determined the part number, or a source, for the mating
   

plug to J10, the external power connector for the 732A-7005 battery pack?  I
noted some postings recently about this but did not find a definitive
response regarding the identity of this plug.  The alternative would appear
to be a complete replacement of J10 and its plug, as long is it all fits in
the opening in the panel.  I hate to 'bore holes' in vintage equipment.

2.   The oven thermistor in my 'new to me' unit measures 4229 ohms (+/-
   

an ohm or two) after the unit has warmed up for a week or so.  I note the
manual refers to 3K to 4K for the value of this thermistor when the unit is
'stable' as well as other's posting values in the mid 3500's ohms for their
units.  Should I be concerned?  The unit seems to be stable to within about
2 uV over about a week (as measured by my 3458A - see below).  Should I open
the unit and try to measure the oven temperature or just be satisfied that
the unit seems to be working?

I had to replace the four 6V 4AH SLA batteries and they charged up
appropriately as judged by the front panel LED's.  I had to remove the
'jumper' for the '40' option on the A7 board and connect the jumper to the
'20' and '10' options (total of '30') in order to get the unit to adjust to
10.0000000 VDC on my 'Agilent In Cal'd' 3458A.

The need to change the jumpers, perhaps, could be just an ageing issue or,
on the other hand, a 'temperature' issue with the oven.

Should I open the unit and directly measure the temperature (supposedly
about 48 degrees C) or just be satisfied with what I have?

My recently added 735C also needed moving some 'jumpers' in order to get it
'on scale', as determined by my 3458A, although it's thermistor measures
about 3330 ohms (after being on for several weeks).

Thanks for everyone's help.

Joe

Hi Joe
I also obtained a Fluke 732A back in October last, and I have fitted a new
set of SLA batteries and it is working just fine - I am still very impressed
by its accuracy and stability, and its build quality.
First, the external 3-pin power socket is a HYPERTRONICS 'D' type connector
(female) type 100-166 - but I have not found one to date !
I also expected the temperature monitoring thermistor to give a 3 to 4 K
ohms, as indicated in the manual P/N 645051 dated May 1983 - but I guess
that you have a later model as I do, mine being serial # 4845***, some
modifications were made,and I understand that this included a change of
thermistor, so the standard reading is in keeping with your result. My unit
gives a very stable 4.520 K ohms, being between 4.52080 and 4.52090 K ohms.
Judging by your findings, you are also using the 1983 copy of the User
Manual - we could both use a more up to date issue.
I am awaiting the repair of my 3458A - so I am having to rely upon a
recently calibrated Keithley 2015 and my good old 3456A - but they both give
very impressive results - The Keithley giving 1.000007 volts for the 1 volt
output, and 10.00000 volts for the 10 volt output (how I miss that final
digit).
Looking forward to your further results and any other owners comments.
Best regards

Roy

-----Original Message-----
From: J. L. Trantham
Sent: Saturday, December 28, 2013 10:51 PM
To: volt-nuts@febo.com
Subject: [volt-nuts] Fluke 732A Questions

I have reviewed the prior postings on Volt-nuts (a very rewarding review,
BTW)) regarding the 732A and have two questions:

1.    Has anyone determined the part number, or a source, for the mating
   

plug to J10, the external power connector for the 732A-7005 battery pack?  I
noted some postings recently about this but did not find a definitive
response regarding the identity of this plug.  The alternative would appear
to be a complete replacement of J10 and its plug, as long is it all fits in
the opening in the panel.  I hate to 'bore holes' in vintage equipment.

2.   The oven thermistor in my 'new to me' unit measures 4229 ohms (+/-
   

an ohm or two) after the unit has warmed up for a week or so.  I note the
manual refers to 3K to 4K for the value of this thermistor when the unit is
'stable' as well as other's posting values in the mid 3500's ohms for their
units.  Should I be concerned?  The unit seems to be stable to within about
2 uV over about a week (as measured by my 3458A - see below).  Should I open
the unit and try to measure the oven temperature or just be satisfied that
the unit seems to be working?

I had to replace the four 6V 4AH SLA batteries and they charged up
appropriately as judged by the front panel LED's.  I had to remove the
'jumper' for the '40' option on the A7 board and connect the jumper to the
'20' and '10' options (total of '30') in order to get the unit to adjust to
10.0000000 VDC on my 'Agilent In Cal'd' 3458A.

The need to change the jumpers, perhaps, could be just an ageing issue or,
on the other hand, a 'temperature' issue with the oven.

Should I open the unit and directly measure the temperature (supposedly
about 48 degrees C) or just be satisfied with what I have?

My recently added 735C also needed moving some 'jumpers' in order to get it
'on scale', as determined by my 3458A, although it's thermistor measures
about 3330 ohms (after being on for several weeks).

Thanks for everyone's help.

Joe

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and follow the instructions there.

Roy,

Thanks for the info.

Looking at the Hypertronics catalog, it would appear that the panel mounted
socket (with male, solder cup, pins) is:

P/N D01EEB306MSUTH

And the mating plug would be:

P/N D01PB306FSUTAH

However, the dimensions are a bit off and the appearance of the panel
mounted socket is not the same as what is on my 732A, J10, on the back of
the 732A-7005 battery module.  My connector is exactly as shown in the
change sheets with a dimension of 0.475 inches side to side and 0.500 inches
top to bottom (as viewed from the back of the unit) rather than 0.512 x
0.512 as suggested in the catalog.

However, the diameter of the mounting hole and the presence of a 'notch'
appears to be as shown in the catalog, thus suggesting that it, indeed, is a
series D01 part.  The diameter of the threaded part of J10 is 0.410 inches
and the catalog calls for a hole diameter of 0.441 inches.

One other observation is the presence of a 'symbol' on the bottom edge of
the socket (as viewed from below) that looks like a stylized 'FRE',  The 'F'
perhaps could be an 'A' and the 'E' perhaps could be a 'B'.  The symbol
starts low and ends low with a 'peak' of the symbol in the middle of the
'R', sort of a 'roof' shape to the top of the symbol and flat on the bottom
of the symbol.

Not sure what that means but I have a picture of it if anyone thinks it
would help.  It does not look like the stylized 'H' symbol shown in the
Hpertronic catalog.  Perhaps the company was something else before they
became Hypertronics.

I looked through the change sheets for the 732A and could find no mention of
the value of the thermistor resistance at temperature, only comments about
what its stability should be.  Knowing that you have a value in the mid 4K
range is reassuring.  My S/N starts with 3.

Right now, it indicates 10.0000005 VDC on the 3458A and 4230 ohms on the
Fluke 8050A.

Thanks for your help.

Joe

-----Original Message-----
From: volt-nuts-bounces@febo.com [mailto:volt-nuts-bounces@febo.com] On
Behalf Of R.Phillips
Sent: Sunday, December 29, 2013 8:40 AM
To: Discussion of precise voltage measurement
Subject: Re: [volt-nuts] Fluke 732A Questions

Hi Joe
I also obtained a Fluke 732A back in October last, and I have fitted a new
set of SLA batteries and it is working just fine - I am still very impressed
by its accuracy and stability, and its build quality.
First, the external 3-pin power socket is a HYPERTRONICS 'D' type connector
(female) type 100-166 - but I have not found one to date !
I also expected the temperature monitoring thermistor to give a 3 to 4 K
ohms, as indicated in the manual P/N 645051 dated May 1983 - but I guess
that you have a later model as I do, mine being serial # 4845***, some
modifications were made,and I understand that this included a change of
thermistor, so the standard reading is in keeping with your result. My unit
gives a very stable 4.520 K ohms, being between 4.52080 and 4.52090 K ohms.
Judging by your findings, you are also using the 1983 copy of the User
Manual - we could both use a more up to date issue.
I am awaiting the repair of my 3458A - so I am having to rely upon a
recently calibrated Keithley 2015 and my good old 3456A - but they both give
very impressive results - The Keithley giving 1.000007 volts for the 1 volt
output, and 10.00000 volts for the 10 volt output (how I miss that final
digit).
Looking forward to your further results and any other owners comments.
Best regards

Roy

-----Original Message-----
From: J. L. Trantham
Sent: Saturday, December 28, 2013 10:51 PM
To: volt-nuts@febo.com
Subject: [volt-nuts] Fluke 732A Questions

I have reviewed the prior postings on Volt-nuts (a very rewarding review,
BTW)) regarding the 732A and have two questions:

1.    Has anyone determined the part number, or a source, for the mating
   

plug to J10, the external power connector for the 732A-7005 battery pack?  I
noted some postings recently about this but did not find a definitive
response regarding the identity of this plug.  The alternative would appear
to be a complete replacement of J10 and its plug, as long is it all fits in
the opening in the panel.  I hate to 'bore holes' in vintage equipment.

2.   The oven thermistor in my 'new to me' unit measures 4229 ohms (+/-
   

an ohm or two) after the unit has warmed up for a week or so.  I note the
manual refers to 3K to 4K for the value of this thermistor when the unit is
'stable' as well as other's posting values in the mid 3500's ohms for their
units.  Should I be concerned?  The unit seems to be stable to within about
2 uV over about a week (as measured by my 3458A - see below).  Should I open
the unit and try to measure the oven temperature or just be satisfied that
the unit seems to be working?

I had to replace the four 6V 4AH SLA batteries and they charged up
appropriately as judged by the front panel LED's.  I had to remove the
'jumper' for the '40' option on the A7 board and connect the jumper to the
'20' and '10' options (total of '30') in order to get the unit to adjust to
10.0000000 VDC on my 'Agilent In Cal'd' 3458A.

The need to change the jumpers, perhaps, could be just an ageing issue or,
on the other hand, a 'temperature' issue with the oven.

Should I open the unit and directly measure the temperature (supposedly
about 48 degrees C) or just be satisfied with what I have?

My recently added 735C also needed moving some 'jumpers' in order to get it
'on scale', as determined by my 3458A, although it's thermistor measures
about 3330 ohms (after being on for several weeks).

Thanks for everyone's help.

Joe

volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to
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Hi Joe,
As Roy has already said, this is a hypertronics connector. I've had one other piece of equipment with this type of connector, a nitrogen laser. See < http://www.thinksrs.com/products/NL100.htm > The downloadable user manual has details. Sorry, I don't have any, or a cheap source.

Robert G8RPI.

From: J. L. Trantham jltran@att.net
To: volt-nuts@febo.com
Sent: Saturday, 28 December 2013, 22:51
Subject: [volt-nuts] Fluke 732A Questions

I have reviewed the prior postings on Volt-nuts (a very rewarding review,
BTW)) regarding the 732A and have two questions:

1.        Has anyone determined the part number, or a source, for the mating
plug to J10, the external power connector for the 732A-7005 battery pack?  I
noted some postings recently about this but did not find a definitive
response regarding the identity of this plug.  The alternative would appear
to be a complete replacement of J10 and its plug, as long is it all fits in
the opening in the panel.  I hate to 'bore holes' in vintage equipment.

2.       The oven thermistor in my 'new to me' unit measures 4229 ohms (+/-
an ohm or two) after the unit has warmed up for a week or so.  I note the
manual refers to 3K to 4K for the value of this thermistor when the unit is
'stable' as well as other's posting values in the mid 3500's ohms for their
units.  Should I be concerned?  The unit seems to be stable to within about
2 uV over about a week (as measured by my 3458A - see below).  Should I open
the unit and try to measure the oven temperature or just be satisfied that
the unit seems to be working?

I had to replace the four 6V 4AH SLA batteries and they charged up
appropriately as judged by the front panel LED's.  I had to remove the
'jumper' for the '40' option on the A7 board and connect the jumper to the
'20' and '10' options (total of '30') in order to get the unit to adjust to
10.0000000 VDC on my 'Agilent In Cal'd' 3458A. 

The need to change the jumpers, perhaps, could be just an ageing issue or,
on the other hand, a 'temperature' issue with the oven.

Should I open the unit and directly measure the temperature (supposedly
about 48 degrees C) or just be satisfied with what I have?

My recently added 735C also needed moving some 'jumpers' in order to get it
'on scale', as determined by my 3458A, although it's thermistor measures
about 3330 ohms (after being on for several weeks).

Thanks for everyone's help.

Joe

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and follow the instructions there.

Robert,

Thanks for the info.

The picture of the socket on the Nitrogen LASER certainly looks like what
the Hypertronics catalog shows and the part number for the plug is certainly
similar (except the LASER has female connectors and the plug has male
connectors) to what I would think would be the plug for the 732A.  However
the picture of the D01 socket on the LASER is not the same as the socket on
the 732A.  The plug, though, might fit both.

I emailed Hypertronics asking if there is a link between Hypertronics and
'FRE' (whatever that is) and if the part number I came up with is available
or not.  The 'automated' responses mentioned 'out of the office' until Jan 6
or so.

We'll see what response I get.

Did you, perhaps, get a plug with the LASER?  If so, did you see if it would
fit the 732A?

Thanks again for the info.

Joe

-----Original Message-----
From: volt-nuts-bounces@febo.com [mailto:volt-nuts-bounces@febo.com] On
Behalf Of Robert Atkinson
Sent: Sunday, December 29, 2013 1:14 PM
To: Discussion of precise voltage measurement
Subject: Re: [volt-nuts] Fluke 732A Questions

Hi Joe,
As Roy has already said, this is a hypertronics connector. I've had one
other piece of equipment with this type of connector, a nitrogen laser. See
< http://www.thinksrs.com/products/NL100.htm > The downloadable user manual
has details. Sorry, I don't have any, or a cheap source.

Robert G8RPI.

From: J. L. Trantham jltran@att.net
To: volt-nuts@febo.com
Sent: Saturday, 28 December 2013, 22:51
Subject: [volt-nuts] Fluke 732A Questions

I have reviewed the prior postings on Volt-nuts (a very rewarding review,
BTW)) regarding the 732A and have two questions:

1.        Has anyone determined the part number, or a source, for the mating
plug to J10, the external power connector for the 732A-7005 battery pack?  I
noted some postings recently about this but did not find a definitive
response regarding the identity of this plug.  The alternative would appear
to be a complete replacement of J10 and its plug, as long is it all fits in
the opening in the panel.  I hate to 'bore holes' in vintage equipment.

2.       The oven thermistor in my 'new to me' unit measures 4229 ohms (+/-
an ohm or two) after the unit has warmed up for a week or so.  I note the
manual refers to 3K to 4K for the value of this thermistor when the unit is
'stable' as well as other's posting values in the mid 3500's ohms for their
units.  Should I be concerned?  The unit seems to be stable to within about
2 uV over about a week (as measured by my 3458A - see below).  Should I open
the unit and try to measure the oven temperature or just be satisfied that
the unit seems to be working?

I had to replace the four 6V 4AH SLA batteries and they charged up
appropriately as judged by the front panel LED's.  I had to remove the
'jumper' for the '40' option on the A7 board and connect the jumper to the
'20' and '10' options (total of '30') in order to get the unit to adjust to
10.0000000 VDC on my 'Agilent In Cal'd' 3458A. 

The need to change the jumpers, perhaps, could be just an ageing issue or,
on the other hand, a 'temperature' issue with the oven.

Should I open the unit and directly measure the temperature (supposedly
about 48 degrees C) or just be satisfied with what I have?

My recently added 735C also needed moving some 'jumpers' in order to get it
'on scale', as determined by my 3458A, although it's thermistor measures
about 3330 ohms (after being on for several weeks).

Thanks for everyone's help.

Joe

volt-nuts mailing list -- volt-nuts@febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts
and follow the instructions there.

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and follow the instructions there.

Joe,

I have the external battery pack (732A-7003) that I picked up a while ago.
It is indeed the D01 connector. It is printed clearly on the outside edge
along with the three letters that look like ARB.

The company's website states they are now owned by Smiths Connectors and the
connector is part of Hypertac. No list of distributors was found on the website.

I found a seller Astrex Electronics, but they do not have a price listed for
the female version, just the male. I searched for D01P306FSTAH. This is the
female plug with solder cups.

To date, I have reconditioned three 732A's and they have been operating fine
with little issues, except when I lost power for an extended time and two
batteries in one of the packs died. All four were replaced and they have
been working fine.

The two older 732A's have thermistor values in the 3k-4k range. The newer
unit (based on the newer heater rev) is around 4.25K.

All three had their potentiometers changed on the regulator and
pre-regulator boards. The datecodes on all appeared to be from 1985. The
parts list must have been updated as some of the pots did not have the same
value as the ones installed. I cannot remember which ones were different. I
did not see a mention in the change/errata.

Also, I had to remove the reference ovens to repair broken 10V
potentiometers, as someone had broken one (free spinning) and another unit
appeared to have a noisy wiper so it was replaced as well. The 1V and 1.018V
pots were not changed. The third 10V pot was replaced because I had success
with the other two and it was much easier the third time around. The jumpers
on the all the A7 boards were adjusted.

I highly recommend checking the inline fuse to the heater if you suspect it
is not working. You can find it tucked inside behind the oven. It should be
covered in heat shrink.

Lastly, there was a rev done that does not appear in the downloadable users
manual on Didier's website.  It appears the heaters were separated into two
groups of two instead of one group of four. Some of the parts were mounted
under the oven assembly on the A8 Preheater PCA. If you look at the A4 board
from the top, you will see either one or two transistors mounted to the
frame (Q4,Q14). If you see only one (Q4), chances are you have the newer rev.

I bought the manual recently and just noticed these revs were in my book.
I will try and scan the extra info and upload them.

Todd

Todd,

Very good information.

Sounds like we are getting close to the correct P/N for the mating plug for
the socket.

My 732A has only a single transistor mounted to the frame from the A4
Regulator Assembly, in the position of Q4, and the resistance is 4230 ohms
after the unit is 'warmed up' and stable.

I recently bought a manual as well but it did not have any 'update sheets'.
I would love to have a copy of your 'update sheets'.

I did a 'clean up' of the update sheets on Didier's site and can send them
to anyone that wants one.

I printed the .PDF from the Fluke site and added the 'cleaned up' version of
the update sheets and it makes a very nice manual.  I would love to add the
other sheets to this.

I also have a 735C that is very similar to the 732A but lot's of mechanical
differences.  It has two transistors on the Regulator Assembly, presumably
A4 and Q4 and Q14.  I do not have a manual for the 735C.

It's thermistor value is in the mid 3K range.  It, too, is very stable and
has many similarities to the 732A but has recently developed a 'new
problem'.  The 'NO CAL' LED comes on after a few days for no apparent
reason.  I need to open it up again and take a look at that circuit to see
what the problem is.

On the 732A, the 'IN CAL' LED is continuously lighted when there has been no
power interruption.  On the 735C, the 'NO CAL' LED illuminates when power is
restored after a power failure.

I replaced the NiCd battery pack and all seems to be well but the 'NO CAL'
LED comes on after having been reset (by inserting a copper wire in the
'adjust' opening).  I wonder if my 'reset' process is the problem.  On the
732A, you connect to the negative terminal then touch the 'pad' inside the
'RESET' opening.  There is no such 'RESET' opening on the 735C.  Just
placing the wire (that I use to adjust the 10 V adjustment) inside the
adjustment opening and aiming to the side would reset the LED.

Happy to help with the scanning of the manual and update sheets if needed.

Thanks again for the info.

Joe

-----Original Message-----
From: volt-nuts-bounces@febo.com [mailto:volt-nuts-bounces@febo.com] On
Behalf Of T. Micallef
Sent: Sunday, December 29, 2013 6:05 PM
To: volt-nuts@febo.com
Subject: Re: [volt-nuts] Fluke 732A Questions

Joe,

I have the external battery pack (732A-7003) that I picked up a while ago.
It is indeed the D01 connector. It is printed clearly on the outside edge
along with the three letters that look like ARB.

The company's website states they are now owned by Smiths Connectors and the
connector is part of Hypertac. No list of distributors was found on the
website.

I found a seller Astrex Electronics, but they do not have a price listed for
the female version, just the male. I searched for D01P306FSTAH. This is the
female plug with solder cups.

To date, I have reconditioned three 732A's and they have been operating fine
with little issues, except when I lost power for an extended time and two
batteries in one of the packs died. All four were replaced and they have
been working fine.

The two older 732A's have thermistor values in the 3k-4k range. The newer
unit (based on the newer heater rev) is around 4.25K.

All three had their potentiometers changed on the regulator and
pre-regulator boards. The datecodes on all appeared to be from 1985. The
parts list must have been updated as some of the pots did not have the same
value as the ones installed. I cannot remember which ones were different. I
did not see a mention in the change/errata.

Also, I had to remove the reference ovens to repair broken 10V
potentiometers, as someone had broken one (free spinning) and another unit
appeared to have a noisy wiper so it was replaced as well. The 1V and 1.018V
pots were not changed. The third 10V pot was replaced because I had success
with the other two and it was much easier the third time around. The jumpers
on the all the A7 boards were adjusted.

I highly recommend checking the inline fuse to the heater if you suspect it
is not working. You can find it tucked inside behind the oven. It should be
covered in heat shrink.

Lastly, there was a rev done that does not appear in the downloadable users
manual on Didier's website.  It appears the heaters were separated into two
groups of two instead of one group of four. Some of the parts were mounted
under the oven assembly on the A8 Preheater PCA. If you look at the A4 board
from the top, you will see either one or two transistors mounted to the
frame (Q4,Q14). If you see only one (Q4), chances are you have the newer
rev.

I bought the manual recently and just noticed these revs were in my book.
I will try and scan the extra info and upload them.

Todd

volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to
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and follow the instructions there.

Joe,

I don't know if it makes any difference but my manual is for the 732A/AN p/n
788414

I found a couple of brochures that I scanned and uploaded too.

I forgot to mention, I have been collecting information regarding the
techniques used to do intercomparisons using scanners like the Data Proof
models. While searching a couple of weeks ago, I came across an old document
from a Measurement Science Conference back in 1983. The document contains an
article regarding the testing of the Fluke 735C. I thought you may have
little to no info regarding your reference and thought I would let you know
about it.

The document is easy to find using google. It is named MSC1983.pdf
I will upload it as well, but I was not sure if Didier wants to track
conference docs.

Todd

Hi Todd
I would appreciate a copy of your later issue manual for the 732A - please
let me know when you make this available  -  Dider's site ?
Many thanks
Roy

-----Original Message-----
From: T. Micallef
Sent: Monday, December 30, 2013 4:03 AM
To: volt-nuts@febo.com
Subject: Re: [volt-nuts] Fluke 732A Questions

Joe,

I don't know if it makes any difference but my manual is for the 732A/AN p/n
788414

I found a couple of brochures that I scanned and uploaded too.

I forgot to mention, I have been collecting information regarding the
techniques used to do intercomparisons using scanners like the Data Proof
models. While searching a couple of weeks ago, I came across an old document
from a Measurement Science Conference back in 1983. The document contains an
article regarding the testing of the Fluke 735C. I thought you may have
little to no info regarding your reference and thought I would let you know
about it.

The document is easy to find using google. It is named MSC1983.pdf
I will upload it as well, but I was not sure if Didier wants to track
conference docs.

Todd

volt-nuts mailing list -- volt-nuts@febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts
and follow the instructions there.