Service Manual Needed - Page 1
Forum section: electronics / general

author: Zenwizard
author_rank: Regular Contributor
timestamp: May 21, 2020, 07:15:56 pm
content: Does anyone have a service manual for a EDC 1030G I think this is the same as the A just with a meter? I was able to locate the operator manual for the servicing and cal part is missing. I am thinking this one has dirty switches and needs a a light cal. 10.00344 Vdc on the 10 V range. for my immediate needs it is fine need to cal some DMM502A's from tektronix but I would like this unit firing on all cylinders.

author: zekeymonkey
author_rank: Newbie
timestamp: May 22, 2020, 12:47:55 am
content: Would you be able to share a copy of the user manual? I also have a EDC 1030G.

author: ArthurDent
author_rank: Super Contributor
timestamp: May 22, 2020, 03:21:03 am
content: "I am thinking this one has dirty switches and needs a a light cal."Manuals, schematics, and cal procedure are available on some other models of Krohn-Hite/EDC standards that might give you some general information but I don't believe there is anything like a "light cal" for any of these standards even if you have the correct manual. The calibration process is involved and requires a reference of higher accuracy otherwise any changes you make might make matters worse. You might be able to use a 6.5 or higher accuracy bench meter and your standard as-is and just match the readings on the 2 meters to get close enough for the Tektronix DMM502A 4.5 digit plugins and leave the calibration on the EDC1030G alone. I have 'calibrated' or adjusted a 5.5 digit meter against a 6.5 digit meter that way and it does work.Oh, and there is a warning in one manual NOT to clean and use regular oil on the switches in these EDC standards because it might shorten the switch life to about 2 months, that isn't by 2 months, but to just 2 months.https://xdevs.com/review/mv106_review/

author: Zenwizard
author_rank: Regular Contributor
timestamp: May 23, 2020, 06:49:26 pm
content: Sorry for he confusion I ment light cal as it is not very far off but far enough to warrant adjustment. It is strange it is off exactly 0.003 mV. I also noticed about 3mV p-p ripple on the output and there was 102mV p-p on the filters. So I am replacing the 2 filter caps and seeing if that brings it back in to spec. I have deoxed the switches. It is the recommended cleaner in the manual. Currently at a stand still till the Digikey box arrives.My main meter in the lab is a Keithly DMM 6500. 6.5 I want to use the tek meter when I am working on gear with more then one power rail rails so I can just watch them all when I am powering things up. I am looking to shortly upgrade to a DM 7510 at the moment an 8.5 is a little out of my reach.Technical Note #012Back to Table of ContentsSwitch Maintenance for Models: 330, 1030, 4032, 4600, 4601, CR series, E100RC, MV series.The decade and range switches of the Models referred to above are lubricated at the factory. It is recommended that these switches DO NOT receive any service during the first year of operation. If you feel there is a problem, consult the factory.Note:Over-zealous, arbitrary, or unnecessary cleaning may damage the switch contacts, which should be maintained below 10 milliohms.Cleaning:Do not arbitrarily clean the switches. In many instances, lubrication may be all that is required.Relubricate After Cleaning!Lubricating - DO NOT USE OIL!The use of a cleaner without lubricating could shorten the life of the switches to about two months.Contamination From Silicone Based Lubricants:Silicone based cleaners/lubricants should not be used where electrical contacts and other electrical components are used. Silicone will react with plastics and atmospheric contamination to form insulating films and silicone carbide compounds. Over time, silicone will react with plastics, softening them, thereby breaking down the integrity of the component (switch, relay, etc.). Silicone-based lubricants may also have been used as a mold release agent or as a general cleaner for housings. Since silicone can migrate great distances, it is recommended to clean the silicone off the surfaces. DeoxIT and PreservIT will displace the silicone.Do Not Use Pencil Erasers:Do not use an eraser - any type of eraser - to clean contacts. Erasers are highly abrasive and will remove the precious metal plating. Further, the glue in erasers leave behind a film that is extremely difficult to remove which can later cause intermittent operation. Rubbing an eraser back and forth across the contacts can be a potential static generator.General Information & PrecautionsWhen using any aerosol, the unit should be de-energized (turned off) and used in well ventilated areas.Switch Contacts cleaner. DeoxIT is a fast-acting, deoxidizing solution that cleans, preserves, lubricates and improves conductivity on metal connectors and contacts.Switch Contacts lubrication. PreservIT seals, lubricates and preserves metal surfaces for protection from oxidation and contamination. For use on clean/new surfaces or those pre-cleaned with DeoxIT. PreservIT contains no cleaners or de-oxidizers. It provides long-lasting protection for newly manufactured components or those cleaned by ultrasonics, DeoxIT or other procedures. PreservIT is recommended as a final treatment for surfaces that are in constant motion and/or subject to higher degrees of atmospheric contamination.Spray Products DirectionsDeoxIT Cleaner:Ideal for general purpose applications. Contains petroleum naphtha as the carrier solvent. It is flammable but non-aggressive to almost all materials. Apply a short burst to metal surface and operate device to assist breaking up of oxide layers. For severely oxidized surfaces, wait a few minutes before operating. Then use lint-free applicators on accessible surfaces and wipe until surface appears clean. In inaccessible areas flush away oxides with DeoxIT D5. As a final step, spray a short burst of DeoxIT for protection. Includes precise, three-way adjustable valve for controlled dispensing with minimal waste and over-spray.PreservIT P5 Lubricant:Ideal for general purpose applications. Contains petroleum naphtha as the carrier solvent. It is flammable but non-aggressive to almost all materials. After cleaning metal surface, apply a short burst of PreservIT. If accessible, wipe with a lint- free applicator. If discoloration appears, the metal surface is not clean - use DeoxIT first. As a final step, spray a short burst of PreservIT for protection. PreservIT P5 includes precise, three-way adjustable valve for controlled dispensing with minimal waste and over-spray.