Solartron 7081 Calibration Problem
I went through the calibration process today, using the manual and my 'new'
Fluke 5100B. I made a 'short circuit plug' by connecting 'HI' to 'LO' only.
All was OK until the last step of 'CALIBRATE REFERENCE'. I kept getting
'FACTOR OUT OF RANGE'. What am I missing?
However, after checking it against my other, Ametek calibrated, 7081, the
readings on the various scales are very close, about 10 uV at 10 VDC, for
instance, and 2 mV at 10 VAC using a 1 kHz signal and about 36 ohms at 1
MegOhm. This is a significant improvement from where it started.
Thanks for any help.
Joe
Joe,
What was the exact value of the DC reference voltage you were applying?
I wonder if the 7081 has a limit built in so that if you're not using a
reference that is pretty close to 10 vdc it will generate the error
you're seeing? Just something to try - adjust your 10 vdc reference
source a couple of millivolts each way and see what you get.
Steve
On 9/2/2012 5:57 PM, J. L. Trantham wrote:
I went through the calibration process today, using the manual and my 'new'
Fluke 5100B. I made a 'short circuit plug' by connecting 'HI' to 'LO' only.
All was OK until the last step of 'CALIBRATE REFERENCE'. I kept getting
'FACTOR OUT OF RANGE'. What am I missing?
However, after checking it against my other, Ametek calibrated, 7081, the
readings on the various scales are very close, about 10 uV at 10 VDC, for
instance, and 2 mV at 10 VAC using a 1 kHz signal and about 36 ohms at 1
MegOhm. This is a significant improvement from where it started.
Thanks for any help.
Joe
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Steve,
I thought of that and tried a voltage that was within about 10 uV of 10 VDC
as measured by my other, Ametek calibrated, 7081 and it still did not help.
Has me puzzled.
Joe
-----Original Message-----
From: volt-nuts-bounces@febo.com [mailto:volt-nuts-bounces@febo.com] On
Behalf Of Steve Krull
Sent: Sunday, September 02, 2012 7:15 PM
To: Discussion of precise voltage measurement
Subject: Re: [volt-nuts] Solartron 7081 Calibration Problem
Joe,
What was the exact value of the DC reference voltage you were applying?
I wonder if the 7081 has a limit built in so that if you're not using a
reference that is pretty close to 10 vdc it will generate the error
you're seeing? Just something to try - adjust your 10 vdc reference
source a couple of millivolts each way and see what you get.
Steve
On 9/2/2012 5:57 PM, J. L. Trantham wrote:
I went through the calibration process today, using the manual and my
'new'
Fluke 5100B. I made a 'short circuit plug' by connecting 'HI' to 'LO'
only.
All was OK until the last step of 'CALIBRATE REFERENCE'. I kept getting
'FACTOR OUT OF RANGE'. What am I missing?
However, after checking it against my other, Ametek calibrated, 7081, the
readings on the various scales are very close, about 10 uV at 10 VDC, for
instance, and 2 mV at 10 VAC using a 1 kHz signal and about 36 ohms at 1
MegOhm. This is a significant improvement from where it started.
Thanks for any help.
Joe
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Joe,
'CALIBRATE REFERENCE' command refers to RATIO/REFERENCE input channel
calibration, located on the back side of 7081. It isn't calibration of the
internal voltage reference (zener). So, you should apply a +10 V to 'RATIO HI' input and connect
-10 V to 'RATIO LO', 0V and main input LO.
Regards,
Mickle T.
Monday, September 3, 2012, 2:57:28 AM, you wrote:
JLT> I went through the calibration process today, using the manual and my 'new'
JLT> Fluke 5100B. I made a 'short circuit plug' by connecting 'HI' to 'LO' only.
JLT> All was OK until the last step of 'CALIBRATE REFERENCE'. I kept getting
JLT> 'FACTOR OUT OF RANGE'. What am I missing?
JLT> However, after checking it against my other, Ametek calibrated, 7081, the
JLT> readings on the various scales are very close, about 10 uV at 10 VDC, for
JLT> instance, and 2 mV at 10 VAC using a 1 kHz signal and about 36 ohms at 1
JLT> MegOhm. This is a significant improvement from where it started.
JLT>
JLT> Thanks for any help.
JLT>
JLT> Joe
Mickle,
Thanks for your response. How is your 7081 doing that you were making PCB
modifications to?
I guess I missed that somewhere in the manual. They just said connect to
the input. I missed the 'reference' to reference input. I will need to get
a proper connector. So, if I understand, short the front panel input and
apply 10 VDC to the Reference input.
Also, what do you use for a 'short circuit plug'? I just made up a
connector connecting pin 2 to pin 4 (HI to LO) and left the other pins open.
Is that correct?
I also, just now, noted that I missed a few steps in the resistance
calibration.
Back to the drawing board, so to speak.
Thanks again.
Joe
-----Original Message-----
From: volt-nuts-bounces@febo.com [mailto:volt-nuts-bounces@febo.com] On
Behalf Of Ìèõàèë (Mickle)
Sent: Sunday, September 02, 2012 11:33 PM
To: Discussion of precise voltage measurement
Subject: Re: [volt-nuts] Solartron 7081 Calibration Problem
Joe,
'CALIBRATE REFERENCE' command refers to RATIO/REFERENCE input channel
calibration, located on the back side of 7081. It isn't calibration of the
internal voltage reference (zener). So, you should apply a +10 V to 'RATIO
HI' input and connect -10 V to 'RATIO LO', 0V and main input LO.
Regards,
Mickle T.
Monday, September 3, 2012, 2:57:28 AM, you wrote:
JLT> I went through the calibration process today, using the manual and
JLT> my 'new' Fluke 5100B. I made a 'short circuit plug' by connecting
JLT> 'HI' to 'LO' only. All was OK until the last step of 'CALIBRATE
JLT> REFERENCE'. I kept getting 'FACTOR OUT OF RANGE'. What am I
JLT> missing? However, after checking it against my other, Ametek
JLT> calibrated, 7081, the readings on the various scales are very
JLT> close, about 10 uV at 10 VDC, for instance, and 2 mV at 10 VAC
JLT> using a 1 kHz signal and about 36 ohms at 1 MegOhm. This is a
JLT> significant improvement from where it started.
JLT>
JLT> Thanks for any help.
JLT>
JLT> Joe
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and follow the instructions there.
Mickle,
I have re-read the manual (again), reading the description of the
'Reference' input.
If I understand correctly, the positive side of 10 VDC goes to the HI
Reference input and the negative side goes to three terminals, the Reference
LO input, the Reference 0V input, and the main LO of the front panel input.
Correct?
Joe
-----Original Message-----
From: volt-nuts-bounces@febo.com [mailto:volt-nuts-bounces@febo.com] On
Behalf Of J. L. Trantham
Sent: Monday, September 03, 2012 6:45 AM
To: 'Ìèõàèë'; 'Discussion of precise voltage measurement'
Subject: Re: [volt-nuts] Solartron 7081 Calibration Problem
Mickle,
Thanks for your response. How is your 7081 doing that you were making PCB
modifications to?
I guess I missed that somewhere in the manual. They just said connect to
the input. I missed the 'reference' to reference input. I will need to get
a proper connector. So, if I understand, short the front panel input and
apply 10 VDC to the Reference input.
Also, what do you use for a 'short circuit plug'? I just made up a
connector connecting pin 2 to pin 4 (HI to LO) and left the other pins open.
Is that correct?
I also, just now, noted that I missed a few steps in the resistance
calibration.
Back to the drawing board, so to speak.
Thanks again.
Joe
-----Original Message-----
From: volt-nuts-bounces@febo.com [mailto:volt-nuts-bounces@febo.com] On
Behalf Of Ìèõàèë (Mickle)
Sent: Sunday, September 02, 2012 11:33 PM
To: Discussion of precise voltage measurement
Subject: Re: [volt-nuts] Solartron 7081 Calibration Problem
Joe,
'CALIBRATE REFERENCE' command refers to RATIO/REFERENCE input channel
calibration, located on the back side of 7081. It isn't calibration of the
internal voltage reference (zener). So, you should apply a +10 V to 'RATIO
HI' input and connect -10 V to 'RATIO LO', 0V and main input LO.
Regards,
Mickle T.
Monday, September 3, 2012, 2:57:28 AM, you wrote:
JLT> I went through the calibration process today, using the manual and
JLT> my 'new' Fluke 5100B. I made a 'short circuit plug' by connecting
JLT> 'HI' to 'LO' only. All was OK until the last step of 'CALIBRATE
JLT> REFERENCE'. I kept getting 'FACTOR OUT OF RANGE'. What am I
JLT> missing? However, after checking it against my other, Ametek
JLT> calibrated, 7081, the readings on the various scales are very
JLT> close, about 10 uV at 10 VDC, for instance, and 2 mV at 10 VAC
JLT> using a 1 kHz signal and about 36 ohms at 1 MegOhm. This is a
JLT> significant improvement from where it started.
JLT>
JLT> Thanks for any help.
JLT>
JLT> Joe
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and follow the instructions there.
Mickle,
I have re-read the manual (again), reading the description of the
'Reference' input.
If I understand correctly, the positive side of 10 VDC goes to the HI
Reference input and the negative side goes to three terminals, the Reference
LO input, the Reference 0V input, and the main LO of the front panel input.
Correct?
Joe