1. Solartron 7081 calibration problems (David C. Partridge)

It has been some years since I last worked on a 7081, and I don't have the manuals at hand.. Is there a way to clear the EAROM contents and perhaps load starting cal constants? I think the EAROM data is corrupt or so far off that it cannot compute new values. Bob On 4/22/2016 9:00 AM, volt-nuts-request@febo.com wrote: > Send volt-nuts mailing list submissions to > volt-nuts@febo.com > > To subscribe or unsubscribe via the World Wide Web, visit > https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > or, via email, send a message with subject or body 'help' to > volt-nuts-request@febo.com > > You can reach the person managing the list at > volt-nuts-owner@febo.com > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of volt-nuts digest..." > > > Today's Topics: > > 1. Solartron 7081 calibration problems (David C. Partridge) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Thu, 21 Apr 2016 20:52:30 +0100 > From: "David C. Partridge" <david.partridge@perdrix.co.uk> > To: "'Discussion of precise voltage measurement'" > <volt-nuts@febo.com>, <Solartron_Schlumberger_Equipment@groups.io> > Subject: [volt-nuts] Solartron 7081 calibration problems > Message-ID: <00c701d19c07$588e7410$09ab5c30$@perdrix.co.uk> > Content-Type: text/plain; charset="US-ASCII" > > I spent some of today attempting to calibrate a 7081 that has had the EAROM > chip (ER3400) on the in-guard (floating) logic board replaced. > > > > For each calibrate command issued I get a "Cal Incomplete" message rather > than a "Cal OK" message (this *may* be OK, or *may* be a fault). > > > > When I try to issue calibrate, reference, 10.00000 I get a message "Factor > out of range" (all other VDC, VAC, and KOHM calibrate commands worked apart > from the Cal Incomplete message). > > > > Does anyone know what the problem is, or have any thoughts as to what the > probable cause might be? > > > > On a very related point, how do you calibrate the Ratio calibration constant > (there's nothing in either the Service manual or the Test Specification > about this other than item 21 in the automated checks section on page 16 > which says: > > > > 22. Ratio - ratio is calibrated. > > > > Dave > > > > > > > > > > > > > > > > > > ------------------------------ > > Subject: Digest Footer > > _______________________________________________ > volt-nuts mailing list > volt-nuts@febo.com > https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > > ------------------------------ > > End of volt-nuts Digest, Vol 80, Issue 14 > ***************************************** >

Yes, there is: The monitor mode command "I" (upper case i) will write a test pattern to the NVM and checksum it. ************** Any calibration constants will be lost ********************** As you don't have the manuals handy here's the long form: Use your favourite software terminal emulator (e.g. Putty) to connect to the 7081 using the serial port. (straight through serial cable). The baud rate is determined by dip-switch S1 on the earthy logic board. If all serial port rate switches are to the right, it's set to 9600 baud. Issue the following commands: out,rs232,on monitor I Ctrl-X Dave -----Original Message----- From: volt-nuts [mailto:volt-nuts-bounces@febo.com] On Behalf Of Four Designs Company Sent: 22 April 2016 17:20 To: volt-nuts@febo.com Subject: Re: [volt-nuts] volt-nuts Digest, Vol 80, Issue 14; Solratron cal issue It has been some years since I last worked on a 7081, and I don't have the manuals at hand.. Is there a way to clear the EAROM contents and perhaps load starting cal constants? I think the EAROM data is corrupt or so far off that it cannot compute new values. Bob