Solartron 7081 testing
Hi, my friends! Hi, Joe!
Now, I examine the characteristics of the Solartron 7081 after ROM upgrade, PCB repairing and small schematic modifications. I need some help with the measurements with a known good device 7081, connected to PC with the RS232 and terminal program. Measurements does not require any special input or input leads at all, only some terminal commands and result logs needed.
Step 1: Activate terminal program and log all output to the file. Switch on the 7081.
Step 2: Via 7081 front panel buttons select 7x9 mode and TRACK.
Step 3: Via terminal program enter the following two commands:
OUTPUT,RS232,ON
DRIFT,OFF
MODE,TEST0
After that, TSTV0 appears on the 7081 display with ADC zero measurement results.
Step 4: Wait approximately 30-60 minutes while the statistics are collected and saved to log file.
Step 5: Enter the following commands via terminal program. After each command need a delay about 20-30 sec for result sampling!!!
DRIFT,NOW
MODE,TEST10
DRIFT,NOW
MODE,TEST0
DRIFT,NOW
MODE,TESTK
DRIFT,NOW
MODE,TEST0
DRIFT,NOW
That's all! Now you can stop logging, turn off the 7081 and shut down the terminal program.
Mickle T.
Mickle,
I can probably do this if I can find the time. Perhaps this weekend. Will
I be doing anything to upset my 'fresh' calibration?
Just to make sure I understand the commands, can you send me the command
list with parenthesis around what I need to enter, such as (OUTPUT,RS232,ON)
(DRIFT,OFF), etc. I don't want to add additional stuff to the command that
should not be there. I also note there is a 'TEST0' which I think is a zero
but since there is a 'TESTK', I just want to make sure. I have not read the
manual in detail. Are these commands discussed in the manual? Also, do I
need to 'short' the input or just leave it open? If I need to 'short' the
input, do I 'short' just 'Lo' to 'Hi' or do I need to include the 'Ohm
source' Lo and Hi as well as the 'Guard'? How long do I need to let the
meter 'warm up' before running the tests?
What ROM upgrade did you do?
Would also love to see the details of your repair.
Joe
-----Original Message-----
From: volt-nuts-bounces@febo.com [mailto:volt-nuts-bounces@febo.com] On
Behalf Of Òèìîôååâ Ìèõàèë
Sent: Thursday, December 01, 2011 5:35 AM
To: 'Discussion of precise voltage measurement'
Subject: [volt-nuts] Solartron 7081 testing
Hi, my friends! Hi, Joe!
Now, I examine the characteristics of the Solartron 7081 after ROM upgrade,
PCB repairing and small schematic modifications. I need some help with the
measurements with a known good device 7081, connected to PC with the RS232
and terminal program. Measurements does not require any special input or
input leads at all, only some terminal commands and result logs needed. Step
1: Activate terminal program and log all output to the file. Switch on the
7081. Step 2: Via 7081 front panel buttons select 7x9 mode and TRACK. Step
3: Via terminal program enter the following two commands: OUTPUT,RS232,ON
DRIFT,OFF MODE,TEST0 After that, TSTV0 appears on the 7081 display with ADC
zero measurement results. Step 4: Wait approximately 30-60 minutes while the
statistics are collected and saved to log file. Step 5: Enter the following
commands via terminal program. After each command need a delay about 20-30
sec for result sampling!!! DRIFT,NOW MODE,TEST10 DRIFT,NOW MODE,TEST0
DRIFT,NOW MODE,TESTK DRIFT,NOW MODE,TEST0 DRIFT,NOW
That's all! Now you can stop logging, turn off the 7081 and shut down the
terminal program.
Mickle T.
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.
Joe,
Thank you very much for your help!
Testing that I needed is absolutely safe and does not affect the 'fresh'
calibration. The commands list with parenthesis around what you need to enter is:
Step 3:
(OUTPUT,RS232,ON)
(DRIFT,OFF)
(MODE,TEST0)
Step 5:
(DRIFT,NOW)
(MODE,TEST10)
(DRIFT,NOW)
(MODE,TEST0)
(DRIFT,NOW)
(MODE,TESTK)
(DRIFT,NOW)
(MODE,TEST0)
(DRIFT,NOW)
All of these commands discussed in the Operating Manual. (DRIFT,OFF) allows to
temporarily disable periodic ADC drift correction. (MODE,TEST0) disables input
amplifier and shorts ADC. (DRIFT,NOW) runs single drift correction cycle.
(MODE,TEST10) connects input amplifier to internal reference (+ 10 V).
(MODE,TESTK) connects ADC integrator input to Ohms current source, that is
equivalent to about 1.6 V ADC input value.
All of these commands are part of the standart internal Self Test. 7081 input
does not matter because its automatically disconnects during tests procedure.
7081 must be cold, i.e. no 'warm up' before running the tests.
My Solartron 7081 was very ill: no LED signs, no display, no life at all :(
I'm spent amount of time to research Earthy Logic and Processor boards, I/O and
memory map, disassemble some of the early ROM procedures, emulate 7081 firmware
via 6809 CPU emulator, change RAM/ROM chips decoding structure to replace the
old and rare 2564 and 6117 chips and adopt PCB for new 28F010 and 6264 ones. I'm
recompiling all of the 2564 ROM contents (1984 year) to the linear block and add to it
recompiled ROMs content by Dave Partridge (1986 year) and flash its to the one
28F010 EEPROM. Now the DMM came to life again :) and I'm continue to research
the ADC and analog subsistem.
This is the replaced parts, including old and broken boards interconnection
cable, two semi-defective RAM and ROM chips: http://img710.imageshack.us/img710/3870/oldromram.jpg
This is the new sub-PCB with two banked ROM 28F010 and address decoders:
http://img811.imageshack.us/img811/1777/pcb4.jpg
Mickle T. (sorry for my horrible English)
Thursday, December 1, 2011, 6:38:00 PM, you wrote:
JLT> Mickle,
JLT> I can probably do this if I can find the time. Perhaps this weekend. Will
JLT> I be doing anything to upset my 'fresh' calibration?
JLT> Just to make sure I understand the commands, can you send me the command
JLT> list with parenthesis around what I need to enter, such as (OUTPUT,RS232,ON)
JLT> (DRIFT,OFF), etc. I don't want to add additional stuff to the command that
JLT> should not be there. I also note there is a 'TEST0' which I think is a zero
JLT> but since there is a 'TESTK', I just want to make sure. I have not read the
JLT> manual in detail. Are these commands discussed in the manual? Also, do I
JLT> need to 'short' the input or just leave it open? If I need to 'short' the
JLT> input, do I 'short' just 'Lo' to 'Hi' or do I need to include the 'Ohm
JLT> source' Lo and Hi as well as the 'Guard'? How long do I need to let the
JLT> meter 'warm up' before running the tests?
JLT> What ROM upgrade did you do?
JLT> Would also love to see the details of your repair.
JLT> Joe
JLT> -----Original Message-----
JLT> From: volt-nuts-bounces@febo.com [mailto:volt-nuts-bounces@febo.com] On
JLT> Behalf Of Òèìîôååâ Ìèõàèë
JLT> Sent: Thursday, December 01, 2011 5:35 AM
JLT> To: 'Discussion of precise voltage measurement'
JLT> Subject: [volt-nuts] Solartron 7081 testing
JLT> Hi, my friends! Hi, Joe!
JLT> Now, I examine the characteristics of the Solartron 7081 after ROM upgrade,
JLT> PCB repairing and small schematic modifications. I need some help with the
JLT> measurements with a known good device 7081, connected to PC with the RS232
JLT> and terminal program. Measurements does not require any special input or
JLT> input leads at all, only some terminal commands and result logs needed. Step
JLT> 1: Activate terminal program and log all output to the file. Switch on the
JLT> 7081. Step 2: Via 7081 front panel buttons select 7x9 mode and TRACK. Step
JLT> 3: Via terminal program enter the following two commands: OUTPUT,RS232,ON
JLT> DRIFT,OFF MODE,TEST0 After that, TSTV0 appears on the 7081 display with ADC
JLT> zero measurement results. Step 4: Wait approximately 30-60 minutes while the
JLT> statistics are collected and saved to log file. Step 5: Enter the following
JLT> commands via terminal program. After each command need a delay about 20-30
JLT> sec for result sampling!!! DRIFT,NOW MODE,TEST10 DRIFT,NOW MODE,TEST0
JLT> DRIFT,NOW MODE,TESTK DRIFT,NOW MODE,TEST0 DRIFT,NOW
JLT> That's all! Now you can stop logging, turn off the 7081 and shut down the
JLT> terminal program.
JLT> Mickle T.
JLT> _______________________________________________
JLT> volt-nuts mailing list -- volt-nuts@febo.com
JLT> To unsubscribe, go to
JLT> https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts
JLT> and follow the instructions there.
JLT> _______________________________________________
JLT> volt-nuts mailing list -- volt-nuts@febo.com
JLT> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts
JLT> and follow the instructions there.
--
Ñ óâàæåíèåì,
?????? mailto:timka2k@yandex.ru
Mickle,
Thanks for the pictures and info. I have an '86 version of firmware in my
7081 but, if I recall correctly, it is very slightly different from David
Partridge's data. I'd have to go back and compare, file to file, to make
sure.
Your efforts seem 'Herculean'. I am impressed by your determination. By
the way, your English is just fine too.
I appreciate your pictures. Do I see a Lithium battery on the lower right
hand corner on the bottom board shown in your picture? I don't recall
seeing that on my meter but I have not opened it up since its return from
AMETEK in England. I have a battery on the top board towards the lower
right hand corner that looks a lot like the battery on your board on the
left hand edge. The battery on the left edge of my meter is sort of
'square'.
I have left my meter on continuously for the past 2 or 3 weeks and it seems
perfectly stable. I can turn it off tomorrow, leave it off over night and,
hopefully, get the measurements done on Saturday.
Joe
-----Original Message-----
From: volt-nuts-bounces@febo.com [mailto:volt-nuts-bounces@febo.com] On
Behalf Of ??????
Sent: Thursday, December 01, 2011 11:15 AM
To: Discussion of precise voltage measurement
Subject: Re: [volt-nuts] Solartron 7081 testing
Joe,
Thank you very much for your help!
Testing that I needed is absolutely safe and does not affect the 'fresh'
calibration. The commands list with parenthesis around what you need to
enter is:
Step 3:
(OUTPUT,RS232,ON)
(DRIFT,OFF)
(MODE,TEST0)
Step 5:
(DRIFT,NOW)
(MODE,TEST10)
(DRIFT,NOW)
(MODE,TEST0)
(DRIFT,NOW)
(MODE,TESTK)
(DRIFT,NOW)
(MODE,TEST0)
(DRIFT,NOW)
All of these commands discussed in the Operating Manual. (DRIFT,OFF) allows
to
temporarily disable periodic ADC drift correction. (MODE,TEST0) disables
input
amplifier and shorts ADC. (DRIFT,NOW) runs single drift correction cycle.
(MODE,TEST10) connects input amplifier to internal reference (+ 10 V).
(MODE,TESTK) connects ADC integrator input to Ohms current source, that is
equivalent to about 1.6 V ADC input value.
All of these commands are part of the standart internal Self Test. 7081
input
does not matter because its automatically disconnects during tests
procedure.
7081 must be cold, i.e. no 'warm up' before running the tests.
My Solartron 7081 was very ill: no LED signs, no display, no life at all :(
I'm spent amount of time to research Earthy Logic and Processor boards, I/O
and
memory map, disassemble some of the early ROM procedures, emulate 7081
firmware
via 6809 CPU emulator, change RAM/ROM chips decoding structure to replace
the
old and rare 2564 and 6117 chips and adopt PCB for new 28F010 and 6264 ones.
I'm
recompiling all of the 2564 ROM contents (1984 year) to the linear block and
add to it
recompiled ROMs content by Dave Partridge (1986 year) and flash its to the
one
28F010 EEPROM. Now the DMM came to life again :) and I'm continue to
research
the ADC and analog subsistem.
This is the replaced parts, including old and broken boards interconnection
cable, two semi-defective RAM and ROM chips:
http://img710.imageshack.us/img710/3870/oldromram.jpg
This is the new sub-PCB with two banked ROM 28F010 and address decoders:
http://img811.imageshack.us/img811/1777/pcb4.jpg
Mickle T. (sorry for my horrible English)
Thursday, December 1, 2011, 6:38:00 PM, you wrote:
JLT> Mickle,
JLT> I can probably do this if I can find the time. Perhaps this weekend.
Will
JLT> I be doing anything to upset my 'fresh' calibration?
JLT> Just to make sure I understand the commands, can you send me the
command
JLT> list with parenthesis around what I need to enter, such as
(OUTPUT,RS232,ON)
JLT> (DRIFT,OFF), etc. I don't want to add additional stuff to the command
that
JLT> should not be there. I also note there is a 'TEST0' which I think is a
zero
JLT> but since there is a 'TESTK', I just want to make sure. I have not
read the
JLT> manual in detail. Are these commands discussed in the manual? Also,
do I
JLT> need to 'short' the input or just leave it open? If I need to 'short'
the
JLT> input, do I 'short' just 'Lo' to 'Hi' or do I need to include the 'Ohm
JLT> source' Lo and Hi as well as the 'Guard'? How long do I need to let
the
JLT> meter 'warm up' before running the tests?
JLT> What ROM upgrade did you do?
JLT> Would also love to see the details of your repair.
JLT> Joe
JLT> -----Original Message-----
JLT> From: volt-nuts-bounces@febo.com [mailto:volt-nuts-bounces@febo.com] On
JLT> Behalf Of Òèìîôååâ Ìèõàèë
JLT> Sent: Thursday, December 01, 2011 5:35 AM
JLT> To: 'Discussion of precise voltage measurement'
JLT> Subject: [volt-nuts] Solartron 7081 testing
JLT> Hi, my friends! Hi, Joe!
JLT> Now, I examine the characteristics of the Solartron 7081 after ROM
upgrade,
JLT> PCB repairing and small schematic modifications. I need some help with
the
JLT> measurements with a known good device 7081, connected to PC with the
RS232
JLT> and terminal program. Measurements does not require any special input
or
JLT> input leads at all, only some terminal commands and result logs needed.
Step
JLT> 1: Activate terminal program and log all output to the file. Switch on
the
JLT> 7081. Step 2: Via 7081 front panel buttons select 7x9 mode and TRACK.
Step
JLT> 3: Via terminal program enter the following two commands:
OUTPUT,RS232,ON
JLT> DRIFT,OFF MODE,TEST0 After that, TSTV0 appears on the 7081 display with
ADC
JLT> zero measurement results. Step 4: Wait approximately 30-60 minutes
while the
JLT> statistics are collected and saved to log file. Step 5: Enter the
following
JLT> commands via terminal program. After each command need a delay about
20-30
JLT> sec for result sampling!!! DRIFT,NOW MODE,TEST10 DRIFT,NOW MODE,TEST0
JLT> DRIFT,NOW MODE,TESTK DRIFT,NOW MODE,TEST0 DRIFT,NOW
JLT> That's all! Now you can stop logging, turn off the 7081 and shut down
the
JLT> terminal program.
JLT> Mickle T.
JLT> _______________________________________________
JLT> volt-nuts mailing list -- volt-nuts@febo.com
JLT> To unsubscribe, go to
JLT> https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts
JLT> and follow the instructions there.
JLT> _______________________________________________
JLT> volt-nuts mailing list -- volt-nuts@febo.com
JLT> To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts
JLT> and follow the instructions there.
--
Ñ óâàæåíèåì,
?????? mailto:timka2k@yandex.ru
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.
Mickle,
Just sent you the file by PM.
Would love to know what it was I just did. Hope it helps
Joe
-----Original Message-----
From: volt-nuts-bounces@febo.com [mailto:volt-nuts-bounces@febo.com] On
Behalf Of ??????
Sent: Thursday, December 01, 2011 11:15 AM
To: Discussion of precise voltage measurement
Subject: Re: [volt-nuts] Solartron 7081 testing
Joe,
Thank you very much for your help!
Testing that I needed is absolutely safe and does not affect the 'fresh'
calibration. The commands list with parenthesis around what you need to
enter is:
Step 3:
(OUTPUT,RS232,ON)
(DRIFT,OFF)
(MODE,TEST0)
Step 5:
(DRIFT,NOW)
(MODE,TEST10)
(DRIFT,NOW)
(MODE,TEST0)
(DRIFT,NOW)
(MODE,TESTK)
(DRIFT,NOW)
(MODE,TEST0)
(DRIFT,NOW)
All of these commands discussed in the Operating Manual. (DRIFT,OFF) allows
to
temporarily disable periodic ADC drift correction. (MODE,TEST0) disables
input
amplifier and shorts ADC. (DRIFT,NOW) runs single drift correction cycle.
(MODE,TEST10) connects input amplifier to internal reference (+ 10 V).
(MODE,TESTK) connects ADC integrator input to Ohms current source, that is
equivalent to about 1.6 V ADC input value.
All of these commands are part of the standart internal Self Test. 7081
input
does not matter because its automatically disconnects during tests
procedure.
7081 must be cold, i.e. no 'warm up' before running the tests.
My Solartron 7081 was very ill: no LED signs, no display, no life at all :(
I'm spent amount of time to research Earthy Logic and Processor boards, I/O
and
memory map, disassemble some of the early ROM procedures, emulate 7081
firmware
via 6809 CPU emulator, change RAM/ROM chips decoding structure to replace
the
old and rare 2564 and 6117 chips and adopt PCB for new 28F010 and 6264 ones.
I'm
recompiling all of the 2564 ROM contents (1984 year) to the linear block and
add to it
recompiled ROMs content by Dave Partridge (1986 year) and flash its to the
one
28F010 EEPROM. Now the DMM came to life again :) and I'm continue to
research
the ADC and analog subsistem.
This is the replaced parts, including old and broken boards interconnection
cable, two semi-defective RAM and ROM chips:
http://img710.imageshack.us/img710/3870/oldromram.jpg
This is the new sub-PCB with two banked ROM 28F010 and address decoders:
http://img811.imageshack.us/img811/1777/pcb4.jpg
Mickle T. (sorry for my horrible English)
Thursday, December 1, 2011, 6:38:00 PM, you wrote:
JLT> Mickle,
JLT> I can probably do this if I can find the time. Perhaps this weekend.
Will
JLT> I be doing anything to upset my 'fresh' calibration?
JLT> Just to make sure I understand the commands, can you send me the
command
JLT> list with parenthesis around what I need to enter, such as
(OUTPUT,RS232,ON)
JLT> (DRIFT,OFF), etc. I don't want to add additional stuff to the command
that
JLT> should not be there. I also note there is a 'TEST0' which I think is a
zero
JLT> but since there is a 'TESTK', I just want to make sure. I have not
read the
JLT> manual in detail. Are these commands discussed in the manual? Also,
do I
JLT> need to 'short' the input or just leave it open? If I need to 'short'
the
JLT> input, do I 'short' just 'Lo' to 'Hi' or do I need to include the 'Ohm
JLT> source' Lo and Hi as well as the 'Guard'? How long do I need to let
the
JLT> meter 'warm up' before running the tests?
JLT> What ROM upgrade did you do?
JLT> Would also love to see the details of your repair.
JLT> Joe
JLT> -----Original Message-----
JLT> From: volt-nuts-bounces@febo.com [mailto:volt-nuts-bounces@febo.com] On
JLT> Behalf Of Òèìîôååâ Ìèõàèë
JLT> Sent: Thursday, December 01, 2011 5:35 AM
JLT> To: 'Discussion of precise voltage measurement'
JLT> Subject: [volt-nuts] Solartron 7081 testing
JLT> Hi, my friends! Hi, Joe!
JLT> Now, I examine the characteristics of the Solartron 7081 after ROM
upgrade,
JLT> PCB repairing and small schematic modifications. I need some help with
the
JLT> measurements with a known good device 7081, connected to PC with the
RS232
JLT> and terminal program. Measurements does not require any special input
or
JLT> input leads at all, only some terminal commands and result logs needed.
Step
JLT> 1: Activate terminal program and log all output to the file. Switch on
the
JLT> 7081. Step 2: Via 7081 front panel buttons select 7x9 mode and TRACK.
Step
JLT> 3: Via terminal program enter the following two commands:
OUTPUT,RS232,ON
JLT> DRIFT,OFF MODE,TEST0 After that, TSTV0 appears on the 7081 display with
ADC
JLT> zero measurement results. Step 4: Wait approximately 30-60 minutes
while the
JLT> statistics are collected and saved to log file. Step 5: Enter the
following
JLT> commands via terminal program. After each command need a delay about
20-30
JLT> sec for result sampling!!! DRIFT,NOW MODE,TEST10 DRIFT,NOW MODE,TEST0
JLT> DRIFT,NOW MODE,TESTK DRIFT,NOW MODE,TEST0 DRIFT,NOW
JLT> That's all! Now you can stop logging, turn off the 7081 and shut down
the
JLT> terminal program.
JLT> Mickle T.
JLT> _______________________________________________
JLT> volt-nuts mailing list -- volt-nuts@febo.com
JLT> To unsubscribe, go to
JLT> https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts
JLT> and follow the instructions there.
JLT> _______________________________________________
JLT> volt-nuts mailing list -- volt-nuts@febo.com
JLT> To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts
JLT> and follow the instructions there.
--
Ñ óâàæåíèåì,
?????? mailto:timka2k@yandex.ru
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.
Mickle,
Forgot to mention that I had left the meter off overnight and had it hooked
up to my Fluke 731B 10 VDC Standard at turn on. Shop temp was 27.1 C.
Joe
-----Original Message-----
From: volt-nuts-bounces@febo.com [mailto:volt-nuts-bounces@febo.com] On
Behalf Of J. L. Trantham
Sent: Saturday, December 03, 2011 2:55 PM
To: '??????'; 'Discussion of precise voltage measurement'
Subject: Re: [volt-nuts] Solartron 7081 testing
Mickle,
Just sent you the file by PM.
Would love to know what it was I just did. Hope it helps
Joe
-----Original Message-----
From: volt-nuts-bounces@febo.com [mailto:volt-nuts-bounces@febo.com] On
Behalf Of ??????
Sent: Thursday, December 01, 2011 11:15 AM
To: Discussion of precise voltage measurement
Subject: Re: [volt-nuts] Solartron 7081 testing
Joe,
Thank you very much for your help!
Testing that I needed is absolutely safe and does not affect the 'fresh'
calibration. The commands list with parenthesis around what you need to
enter is:
Step 3:
(OUTPUT,RS232,ON)
(DRIFT,OFF)
(MODE,TEST0)
Step 5:
(DRIFT,NOW)
(MODE,TEST10)
(DRIFT,NOW)
(MODE,TEST0)
(DRIFT,NOW)
(MODE,TESTK)
(DRIFT,NOW)
(MODE,TEST0)
(DRIFT,NOW)
All of these commands discussed in the Operating Manual. (DRIFT,OFF) allows
to
temporarily disable periodic ADC drift correction. (MODE,TEST0) disables
input
amplifier and shorts ADC. (DRIFT,NOW) runs single drift correction cycle.
(MODE,TEST10) connects input amplifier to internal reference (+ 10 V).
(MODE,TESTK) connects ADC integrator input to Ohms current source, that is
equivalent to about 1.6 V ADC input value.
All of these commands are part of the standart internal Self Test. 7081
input
does not matter because its automatically disconnects during tests
procedure.
7081 must be cold, i.e. no 'warm up' before running the tests.
My Solartron 7081 was very ill: no LED signs, no display, no life at all :(
I'm spent amount of time to research Earthy Logic and Processor boards, I/O
and
memory map, disassemble some of the early ROM procedures, emulate 7081
firmware
via 6809 CPU emulator, change RAM/ROM chips decoding structure to replace
the
old and rare 2564 and 6117 chips and adopt PCB for new 28F010 and 6264 ones.
I'm
recompiling all of the 2564 ROM contents (1984 year) to the linear block and
add to it
recompiled ROMs content by Dave Partridge (1986 year) and flash its to the
one
28F010 EEPROM. Now the DMM came to life again :) and I'm continue to
research
the ADC and analog subsistem.
This is the replaced parts, including old and broken boards interconnection
cable, two semi-defective RAM and ROM chips:
http://img710.imageshack.us/img710/3870/oldromram.jpg
This is the new sub-PCB with two banked ROM 28F010 and address decoders:
http://img811.imageshack.us/img811/1777/pcb4.jpg
Mickle T. (sorry for my horrible English)
Thursday, December 1, 2011, 6:38:00 PM, you wrote:
JLT> Mickle,
JLT> I can probably do this if I can find the time. Perhaps this weekend.
Will
JLT> I be doing anything to upset my 'fresh' calibration?
JLT> Just to make sure I understand the commands, can you send me the
command
JLT> list with parenthesis around what I need to enter, such as
(OUTPUT,RS232,ON)
JLT> (DRIFT,OFF), etc. I don't want to add additional stuff to the command
that
JLT> should not be there. I also note there is a 'TEST0' which I think is a
zero
JLT> but since there is a 'TESTK', I just want to make sure. I have not
read the
JLT> manual in detail. Are these commands discussed in the manual? Also,
do I
JLT> need to 'short' the input or just leave it open? If I need to 'short'
the
JLT> input, do I 'short' just 'Lo' to 'Hi' or do I need to include the 'Ohm
JLT> source' Lo and Hi as well as the 'Guard'? How long do I need to let
the
JLT> meter 'warm up' before running the tests?
JLT> What ROM upgrade did you do?
JLT> Would also love to see the details of your repair.
JLT> Joe
JLT> -----Original Message-----
JLT> From: volt-nuts-bounces@febo.com [mailto:volt-nuts-bounces@febo.com] On
JLT> Behalf Of Òèìîôååâ Ìèõàèë
JLT> Sent: Thursday, December 01, 2011 5:35 AM
JLT> To: 'Discussion of precise voltage measurement'
JLT> Subject: [volt-nuts] Solartron 7081 testing
JLT> Hi, my friends! Hi, Joe!
JLT> Now, I examine the characteristics of the Solartron 7081 after ROM
upgrade,
JLT> PCB repairing and small schematic modifications. I need some help with
the
JLT> measurements with a known good device 7081, connected to PC with the
RS232
JLT> and terminal program. Measurements does not require any special input
or
JLT> input leads at all, only some terminal commands and result logs needed.
Step
JLT> 1: Activate terminal program and log all output to the file. Switch on
the
JLT> 7081. Step 2: Via 7081 front panel buttons select 7x9 mode and TRACK.
Step
JLT> 3: Via terminal program enter the following two commands:
OUTPUT,RS232,ON
JLT> DRIFT,OFF MODE,TEST0 After that, TSTV0 appears on the 7081 display with
ADC
JLT> zero measurement results. Step 4: Wait approximately 30-60 minutes
while the
JLT> statistics are collected and saved to log file. Step 5: Enter the
following
JLT> commands via terminal program. After each command need a delay about
20-30
JLT> sec for result sampling!!! DRIFT,NOW MODE,TEST10 DRIFT,NOW MODE,TEST0
JLT> DRIFT,NOW MODE,TESTK DRIFT,NOW MODE,TEST0 DRIFT,NOW
JLT> That's all! Now you can stop logging, turn off the 7081 and shut down
the
JLT> terminal program.
JLT> Mickle T.
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--
Ñ óâàæåíèåì,
?????? mailto:timka2k@yandex.ru
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Joe,
I am very grateful to you! All of the data your acquired was completely
coincided with my results. Now I'm think I'm found a bottleneck in the Solartron
7081 perfomance. Slow analog multiplexor that are part of the Ratio
Circuit leads to improper function of the periodic drift correction (ADC Zero,
AutoZero) and to large DC voltage measurement errors, up to 5-7 ppm at the all
ranges.
This is the simple description of the problem I found: http://img31.imageshack.us/img31/9798/solartron7081autozerobu.jpg
This is the summary of the your measurement results: http://img856.imageshack.us/img856/636/adczero.png
This is the multiplexor and ADC schematic diagrams with my comments:
http://img822.imageshack.us/img822/2377/solartron7081adc.jpg
http://img40.imageshack.us/img40/371/solartron7081ratiocircu.jpg
Mickle T.
Sunday, December 4, 2011, 12:54:41 AM, you wrote:
JLT> Mickle,
JLT> Just sent you the file by PM.
JLT> Would love to know what it was I just did. Hope it helps
JLT> Joe
Mickle,
Happy to help.
The meter I have I got from a list member in California for a reasonable
price. It seemed to work OK but I researched the original manufacturer and
sent it to AMETEK in Oak Ridge, TN, who, in turn, sent it to AMETEK in
England, the current 'owner' of Solartron/Schlumberger, who ceased 'full
support' for the 7081 in 2008. However, they still support it 'best
efforts' and returned my unit with a full set of CAL data along with the
removed and replaced parts consisting of a back up battery, the front panel
connector and three 1K resistors, all for $800, including return shipping.
My shipping to Oak Ridge was about $50.
If you would like a copy of the calibration data, I can send it to you.
I have generally left it on for weeks at a time and I can repeat the test,
warmed up, if you like. I have left it connected to a Fluke 731B along with
two 3458A's. Interestingly, the 7081 seems to be the most stable. After a
few days, the 3458A's will be 5 or 10 uV off but, after an 'ACAL ALL', they
come back very close, typically about 1 uV from the 7081.
My 3458A's have not been calibrated yet but will be just as soon as I figure
out how to read the CALRAM via HPIB. That is proving to be quite the
challenge. I am going to need some serious education in IEEE 488.2 before
this is all over.
Sounds like you are quite dedicated to digesting all the intricacies of the
7081.
Joe
-----Original Message-----
From: volt-nuts-bounces@febo.com [mailto:volt-nuts-bounces@febo.com] On
Behalf Of ??????
Sent: Sunday, December 04, 2011 1:52 PM
To: Discussion of precise voltage measurement
Subject: Re: [volt-nuts] Solartron 7081 testing
Joe,
I am very grateful to you! All of the data your acquired was completely
coincided with my results. Now I'm think I'm found a bottleneck in the
Solartron 7081 perfomance. Slow analog multiplexor that are part of the
Ratio Circuit leads to improper function of the periodic drift correction
(ADC Zero,
AutoZero) and to large DC voltage measurement errors, up to 5-7 ppm at the
all ranges. This is the simple description of the problem I found:
http://img31.imageshack.us/img31/9798/solartron7081autozerobu.jpg
This is the summary of the your measurement results:
http://img856.imageshack.us/img856/636/adczero.png
This is the multiplexor and ADC schematic diagrams with my comments:
http://img822.imageshack.us/img822/2377/solartron7081adc.jpg
http://img40.imageshack.us/img40/371/solartron7081ratiocircu.jpg
Mickle T.
Sunday, December 4, 2011, 12:54:41 AM, you wrote:
JLT> Mickle,
JLT> Just sent you the file by PM.
JLT> Would love to know what it was I just did. Hope it helps Joe
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