[volt-nuts] Serious problems fluke 731A, 720 and solartron

[J. L. Trantham]

Fred,

I have recently acquired a Solartron 7081 and have had a lot of fun getting
to know the meter.  In an effort to get it 'calibrated', I chased down the
US branch of AMETEK, the company that now apparently owns Solartron.  I
shipped my meter to them yesterday and they will ship it to England for
calibration, repair and alignment, as needed.  The 7081 ceased production in
1998 and full support ended in 2008 but it is still supported, 'best
endeavours'.

When I was on the phone with them this AM to give them my credit card
information, I asked if they still supported the 7061, remembering this
thread.  She said the 7061 is still on the list of supported equipment.  So,
worst case scenario, you could contact AMETEK and see what options might
exist for your 7061.

Joe

-----Original Message-----
From: volt-nuts-bounces at febo.com [mailto:volt-nuts-bounces at febo.com]On
Behalf Of Fred Schneider
Sent: Thursday, September 29, 2011 5:35 PM
To: Discussion of precise voltage measurement
Subject: Re: [volt-nuts] Serious problems fluke 731A, 720 and solartron

The voltage collapses. I have to measure how much but not just a few uV.
More like 200 mV if I remember it right. I know it is a resitive divider but
the influence on each other is getting worse if it is on 24/7,  another sign
something is wrong. The 1V influences akso the 10 V so you keep it
adjusting. If i set 10 V correct and then the 1 V's the 10 V is off again.


The 845 AB had its nicads removed and they placed a big zener instead. The
most important thing, I made a regulated and good filtered powersupply. I
placed the pcb for that in the space the nicds were mounted.
I also have a HP frequency standard that had a batterybox. But they were
dead and i did not needed that so now i build a trimble thunderbolt into
that space and used the 100 KHz output of the HP for the 10 MHz. That is the
advantage of having gear with a battery option ;-)

I can think i can fix the solartron Problem if I can find a service manual.
But now I can not even check the powersupply voltages because I do not know
them. Filtercaps are good.

Fred


>>
>
> Fred,
>
> What happens to the 10 volt position of the Fluke 731 when you attach a 10
MegOhm input Voltmeter ?
>
> I am sure you know that the 1 volt positions are just resistive dividers
and any loading of any kind will drop their value.
>
> Also, could you give details on what modifications you made to the 845AB ?
>
> thanks,
>
> Bill....WB6BNQ
>
>
>
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