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

[Steve Krull]

Joe,

I was within a couple of hundred yards of your 7081 this past week, if 
it shipped to England without any delay! The Ametek/Solartron building 
is just up the road from our pilot training center at Farnborough 
Airport and I was there for meetings this past week. I had intended to 
wander up the road and see if there was anyone left from the test 
equipment group but time got away from me. The closest I got was driving 
by the entrance to the industrial park.

While in England I did manage, through a friend, to pick up a set of 
Solartron test leads with banana plugs, and he's going to see if he can 
find his Kelvin clip set and probe set too. With the leads, good food, 
good ale, good weather, and good company, it was a great trip. I 
generally have at least one meeting a year at Farnborough and Gatwick 
airports so I hope to eventually make it up the road to 
Ametek/Solartron. Not sure if I want to take my 7081 in my luggage but I 
may yet.

Steve




On Sun, Sep 25, 2011 at 11:31 AM, J. L. Trantham wrote:

> 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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