Re: [volt-nuts] 3457A (6.5 digit multi-meter). Is it best to keep it on?

I would recommend leaving it on. You want to make sure it soaks as long as possible and then test it before shipping. Keysight soaks the 3458A before testing and it makes sense since you want to calibrate the meters as if they are in use 24/7. Inspect the supplies and make sure you have no

Re: [volt-nuts] 3458A Multi-Year Calibration/Service Agreement

Don, I have not negotiated the agreement but am happy with the cost. You will be too if the meter fails cal and needs repair. I paid for the 5 years of service up front and the calibration agreement is paid annually. I found it easier to do it this way. I changed the calibration level to the one

Re: [volt-nuts] Fluke 732A schematic re-drawn?

Bill, The reason why Q14 was dropped was that there was an additional pcb added to the reference. The A8 preheater did not exist on the older models. It appears the heating was changed to a split design where the heaters were divided into two groups. The control line still goes out P2-1 but

Re: [volt-nuts] Neon bulbs for HP 3420B or 419A chopper

Randy, There appears to be no MOQ on those bulbs and they have 972 in stock. I think you can order what you want. Todd On Sat, Jan 6, 2018 at 12:34 PM, Randy Evans wrote: > Is there a relaible source for the GT-NE6H1925T neons? Mouser has them for > special order

Re: [volt-nuts] GPIB Issue with 3458A

Randy, Check that your firmware version on the Prologix is up to date. The latest USB version is 6.107. You can see it in the Prologix GPIB Configurator utility that can be downloaded from a link on their website. http://prologix.biz/resources.html I have uploaded a pic of my settings shown in

Re: [volt-nuts] GPIB Issue with 3458A

g. All it does is print out "HP3458A" on > the output console and then just sits there. > > Randy > > On Sat, Dec 30, 2017 at 7:43 PM, Todd Micallef <tmical...@gmail.com> > wrote: > > > Randy, > > > > I just remembered that I changed the dura

Re: [volt-nuts] GPIB Issue with 3458A

Randy, I just remembered that I changed the duration from 30 minutes to 2 minutes to speed up the test. I forgot to change it back. Todd On Sat, Dec 30, 2017 at 10:27 PM, Todd Micallef <tmical...@gmail.com> wrote: > Randy, > > I just sent it. I haven't modified Martin's cod

Re: [volt-nuts] GPIB Issue with 3458A

gt; > Sent from my Verizon, Samsung Galaxy smartphone > Original message ----From: Todd Micallef <tmical...@gmail.com> > Date: 12/30/17 6:40 PM (GMT-08:00) To: Discussion of precise voltage > measurement <volt-nuts@febo.com> Subject: Re: [volt-nuts] GPIB Issue wi

Re: [volt-nuts] GPIB Issue with 3458A

ain, > Randy > > Sent from my Verizon, Samsung Galaxy smartphone > ---- Original message From: Todd Micallef <tmical...@gmail.com> > Date: 12/30/17 6:13 PM (GMT-08:00) To: Discussion of precise voltage > measurement <volt-nuts@febo.com> Subject: Re: [volt

Re: [volt-nuts] GPIB Issue with 3458A

ode per your directions (V1.02). > > Thanks, > > Randy > > On Sat, Dec 30, 2017 at 3:55 PM, Todd Micallef <tmical...@gmail.com> > wrote: > > > Randy, > > > > I will continue to look for my adapter. I haven't used it for quite a > > while. >

Re: [volt-nuts] GPIB Issue with 3458A

ss,TRIGGER_SOURCE);// Hold trigger > > until meter can be setup > >EZGPIB_BusWriteData(gpib_address,'INBUF ON'); > >EZGPIB_BusWriteData(gpib_address,AUTO_ZERO); > >EZGPIB_BusWriteData(gpib_address,OUTPUT_FORMAT); > > end; > > > > > > Rand

Re: [volt-nuts] GPIB Issue with 3458A

>EZGPIB_BusWriteData(gpib_address,'INBUF ON'); >EZGPIB_BusWriteData(gpib_address,AUTO_ZERO); >EZGPIB_BusWriteData(gpib_address,OUTPUT_FORMAT); > end; > > > Randy > > On Sat, Dec 30, 2017 at 11:20 AM, Todd Micallef <tmical...@gmail.com> > wrote: > > &

Re: [volt-nuts] GPIB Issue with 3458A

> Todd, > > I have version 1.01. Yes, please e-mail me your modified version. Maybe it > will help. > > Thanks, > > Randy > > On Sat, Dec 30, 2017 at 4:24 AM, Todd Micallef <tmical...@gmail.com> > wrote: > > > Randy, > > > > Is there a

Re: [volt-nuts] GPIB Issue with 3458A

Randy, Is there a version number at the top of the file? I had two versions (1.00 and 1.01). I can't remember all that changed between the two since it has been a while but I did find an additional timeout code that limited the wait time for reading data to 1 minute. I am guessing I had a problem

Re: [volt-nuts] EPROM Programmer

Randy, I use the GQ-4X from mcumall.com. It works great and I have had no problems with it. I have bought a few adapters to support PLCC and SOIC packages. For the NVRAM, don't overlook the STMicroelectronics memory. I have used the M48Z12 as a direct replacement.with no issues. The only thing I

Re: [volt-nuts] Best way to measure micro Ohms

can't tell by the photo. Todd On Mon, Sep 18, 2017 at 5:44 PM, Dr. David Kirkby (Kirkby Microwave Ltd) < drkir...@kirkbymicrowave.co.uk> wrote: > On 18 September 2017 at 18:36, Todd Micallef <tmical...@gmail.com> wrote: > > > Dave, > > > > Another meter is t

Re: [volt-nuts] Best way to measure micro Ohms

Dave, Another meter is the Cambridge LOM-510A. I am not sure if it is in your budget but there has been a review made on EEVBlog. There is one currently on eBay with a current amplifier that I have never seen before today. It may be worth reviewing if it meets your needs. Todd On Mon, Sep 18,

Re: [volt-nuts] Fluke 732a concernes

Igor, Congratulations on your purchase. Your initial readings on the 10v and 1.018v did not appear too high. It depends on which jumpers were already selected. I think on all of mine the 40ppm jumper was the only one installed. The problem with the 1v output might be due to a broken trimmer pot.

Re: [volt-nuts] Datron 4700 manual and options

se my friend retires. > > Fred > > . > > On 07/20/2017 04:51 PM, Todd Micallef wrote: > >> Fred, >> >> Shorted tantalums most likely. I had several on mine that went bad as >> quickly as I replaced them. I would start with the inguard supply board. >>

Re: [volt-nuts] Datron 4600 Transconductance Amplifier

Dave, I have the same problem. I ordered some connectors from an auction and they are due to arrive this week. They were ordered as a set since the female connector was hard to find. I was going to ask the group if both cables were straight through and if any of the wires were of any special

Re: [volt-nuts] Solartron 7060G

I don't have one in my collection but fellow member Dave Partridge had a similar issue on a 7081. His detailed repair is here http://www.perdrix.co.uk/Solartron7081/index.htm Perhaps there are some similarities between the two models that can point you in the right direction? If you have a

[volt-nuts] Datron 1281 Keys

This is a follow-up to my post last November https://www.febo.com/pipermail/volt-nuts/2015-November/004562.html I was able to track down the manufacturer of the keyswitch. It appears that Lorlin is the manufacturer and the key number is the same. With the help of another member I was able to

Re: [volt-nuts] Keithley 2001 - do you need to open it to calibrate it?

. On Sun, Jun 26, 2016 at 5:29 PM, Dr. David Kirkby (Kirkby Microwave Ltd) < drkir...@kirkbymicrowave.co.uk> wrote: > On 26 June 2016 at 20:46, Todd Micallef <tmical...@gmail.com> wrote: > > > David, > > > > I have found that many sellers like to remove an

Re: [volt-nuts] Keithley 2182A

at that TP. Without a schematic, it will take some > time to determine what is different after the TP652 point - maybe there are > in fact 2 ADCs, but it's not obvious either way. > > Russ > > On Sun, Jun 26, 2016 at 11:16 AM, Todd Micallef <tmical...@gmail.com> > wrote: &g

Re: [volt-nuts] Keithley 2001 - do you need to open it to calibrate it?

David, I have found that many sellers like to remove any calibration stickers or tamper evident stickers. Not sure why they do that as a sticker does not mean the item is calibrated. If you have 14 days, run it through the paces and perform self-tests. There are some test scripts here

Re: [volt-nuts] Thermal EMF of common solder

Andrea, Thank you for your research. A few years ago I purchased some Pb free solder from Radio Shack. I recently discovered it is listed as 96/4 solder. The part number is 640-0025 https://www.radioshack.com/products/lead-free-solder-0-25-oz?variant=5717831877 The MSDS is listed on the

Re: [volt-nuts] Thermal EMF of common solder

I believe it is listed in the document that comes with Keithley's 2188 connector. There is a brief mention here ... http://www.signaltestinc.com/v/vspfiles/assets/datasheet/Cnctr-Adpt-Tools_Acc.pdf Todd On Sun, Jun 26, 2016 at 12:55 PM, David wrote: > There was a

Re: [volt-nuts] Keithley 2182A

I have to review my notes, but I know of the two bad parts that were found, one was the TF-245. I happened to have a spare on hand. I will look through any notes to get the other part number. Todd Sent from my iPad > On Jun 26, 2016, at 10:09, Russ Ramirez wrote: > >

Re: [volt-nuts] PCB fasteners for Datron meters (David C. Partridge)

t; Dave > > -Original Message- > From: volt-nuts [mailto:volt-nuts-boun...@febo.com] On Behalf Of Todd > Micallef > Sent: 26 April 2016 21:12 > To: Discussion of precise voltage measurement > Subject: Re: [volt-nuts] PCB fasteners for Datron meters (David C. > Partrid

[volt-nuts] PCB fasteners for Datron meters

Sure. I have a couple of broken fasteners. What is smallish quantities? I would be willing to take 10 or more if a minimum quantity is needed. Todd On Sun, Apr 24, 2016 at 10:33 AM, David C. Partridge < david.partri...@perdrix.co.uk

Re: [volt-nuts] Datron 1281 NVRAM woes

I will get it this evening. Hope to be finished with work within the next couple of hours. On Thursday, April 14, 2016, Bert Kachler wrote: > Hi Todd and ??, > > thanks for your answers! > I think it is a good suggestion to > try to see first whether the Eproms are intact.

Re: [volt-nuts] Datron 1281 NVRAM woes

Bert, I did a test not that long ago for another volt-nut by disconnecting the cable between the digital and DCV boards. I got the following error: "9005.9 Pon tru/compl 00173A". One of mine came with a 9005.7 00150C error and it turned out to be a disconnected cable on one of the option boards

Re: [volt-nuts] Before I order the connector for the Solartron 7081 ....

Try keiconn.com Kensington Electronics is a distributor, they have a minimum order but you will probably meet it. Todd On Tuesday, March 15, 2016, Pete Lancashire wrote: > Anyone recommend a North American source ? or have one they are not using ? > > And where

Re: [volt-nuts] Solartron 7081 .. what to look for

I have seen the photos of one in a 3458A go bad. Not a pretty sight but it looks like the gunk is removable. The input filters are being changed out on most of my older gear (Fluke,Keithley,Solartron,Datron) and not all of it is Schaffner. I think that anything going back that far and is

Re: [volt-nuts] Fw: Datron 1281 / 1271 secret GPIB cmds for CALRAM-Readout

PeLuLe, I am currently working on two 1281's. If you have anything you would like me to try, let me know. I am certain my cal constants are not good on one of them. The battery was just changed a few days ago and it appears to be the original from '87. I also had some intermittent NVRAM errors.

Re: [volt-nuts] Wavetek 1281 - Calibration Key

inal Message - From: "Todd Micallef" <tmical...@gmail.com> > To: "Discussion of precise voltage measurement" <volt-nuts@febo.com> > Sent: Sunday, November 01, 2015 8:23 PM > Subject: Re: [volt-nuts] Wavetek 1281 - Calibration Key > > > Unfortunat

Re: [volt-nuts] Wavetek 1281 - Calibration Key

Unfortunately, when I had my keys made for the 4700, I took the lock out of a broken 1071 to the locksmith. I originally showed them photos of an actual key and they looked at me like I was crazy. I could only find two locksmiths near me for the 4700 and a Valhalla 2724A. Both wanted a lock before

Re: [volt-nuts] Wavetek 1281 - Selfcal Module

No problem. I was just looking back at the documents wondering if I missed anything. The transformer solution is interesting and I see that the 8508A has a second low voltage transformer (T1). I have no idea if it performs the same function using a different calibration. On Sat, Oct 31, 2015 at

Re: [volt-nuts] Wavetek 1281 - Selfcal Module

Ok, I will look at them again. Sent from my iPad > On Oct 30, 2015, at 07:26, Frank Stellmach wrote: > > Hello Todd, > > many thanks for the reference schematics. > > But that's not the SelfCAL module. > > This should be capable of doing precise 10:1 ratio

Re: [volt-nuts] Wavetek 1281 - Selfcal Module

I recently picked up a 1281 that is throwing a couple of errors. While researching the problem, I looked for the SelfCAL description and did not see anything conclusive. I will pull out my schematics and see if there are any references to a particular module. I was under the impression they were

Re: [volt-nuts] Fluke 720a self calibration repair

I noticed that some of the vendors listed overall end-end tcr and at least one that listed the wiper tcr too. Hopefully you can get the datasheets with both. Todd On Saturday, September 26, 2015, David Garrido wrote: > Thank you for all of the input on this folks. > > Does

Re: [volt-nuts] Making a Reference IC

Dave, What is the problem with the original reference? I have not heard of too many failing. There was also a reply from Hank on another message. Perhaps he can provide the needed parts from a 732A? Todd On Mon, Sep 14, 2015 at 6:45 PM, Dave M wrote: > After making a

Re: [volt-nuts] Anyone know how to make stable inductors?

Here is a DIY guide to making some lab standards. It is detailed with some component values. http://nopr.niscair.res.in/bitstream/123456789/4848/1/JSIR%2065%286%29%20510-513.pdf On Wed, Aug 19, 2015 at 8:48 PM, Dave M dgmin...@mediacombb.net wrote: Here's a paragraph from IETLab's web site on

Re: [volt-nuts] Precision resistors

David, Depending on the time frame needed for these resistors you can order many (but not all) of the parts from Farnell. I believe the Rhopoint resistors are the recommended brand. The high value resistors could be Caddock USF series. Another alternative would be to contact Edwin Pettis. He

Re: [volt-nuts] Test Leads

Randy, I made my own version of the Fluke 5440A-7003 cables here ... http://us.flukecal.com/products/accessories/test-leads-probes-and-clips/5440a-7003 I bought some Belden 8719 cable, blue Pomona patch cables (B-18-6), and some gold-plated spade lugs from here

Re: [volt-nuts] easy 3458A AC calibration

I used a Fluke 5100B and 8920A for my SCAL calibration. I got lucky and it passed at Agilent. I think if you use a 3325A , you should get results that are close. Todd Sent from my iPad On May 20, 2015, at 15:46, Electronics and Books via volt-nuts volt-nuts@febo.com wrote: It is stated

Re: [volt-nuts] Bls: Bls: How accurate is a fluke after 9 years

The 5700A5720A verification test lists a maximum deviation from nominal on the resistance ranges. Is there any information on how well Fluke's hybrid resistors are maintaining their specs over the lifetime of the calibrator? Anyone have access to long term records of the resistance values? Todd

Re: [volt-nuts] How accurate is a fluke after 9 years

Frans, Do you perform an in-house calibration with a 10V reference and 1 ohm 10k resistors? I have been studying the recommended calibration intervals of Fluke's 57xx series calibrators and I wonder how well the unit maintains its stability over long intervals between trips to a cal lab.

Re: [volt-nuts] HP-3458a display board

Definitely good price. My replacement display board for a Keithley 2400 was ~$480.00 US. I could have replaced a few 3458A boards for a little more. Agilent typically sent me parts next day for no additional overnight charge. Keithley/Tek was ~$30 for standard shipping. The bad thing is that

Re: [volt-nuts] Calibration of voltage standards

A Data Proof scanner seems to be the standard of some primary labs. They don't show up often on the auction site. This company makes one that fits the front of a 732B. I have never seen it in use. http://www.hpd-online.com/reversing_switch.php There also appears to be a Guildline 9600 up for

Re: [volt-nuts] 3458A reference boards on ebay

There is currently a thread on EEVBlog where one has already been built. I believe it can be purchased once the final layout is completed. http://www.eevblog.com/forum/projects/project-kx-diy-calibrator-reference-sourcemeter/ Todd On Fri, Jan 30, 2015 at 8:24 AM, Dr. David Kirkby (Kirkby

Re: [volt-nuts] Design Spark PCB Design Package

Has anyone had any Gerber file compatibility issues with batch pcb manufacturers? For example, pad sizes or trace widths not matching what is on the screen. Todd On Mon, Jan 5, 2015 at 4:41 PM, David C. Partridge david.partri...@perdrix.co.uk wrote: Lack of forward/back annotation would kill

Re: [volt-nuts] The averaging reference

I believe the 1281 uses the LTZ1000. The datasheet mentions dual references. My 4920 has both a ltz1000 and a lm399. I think you can find pics of the 1281 dual ref setup on eevblog. I would not be surprised if the 8508a has a similar configuration. Todd On Saturday, December 20, 2014, Richard

Re: [volt-nuts] Agilent 34970A (34401A) self test error 606

Andrea, If the problem is related to temperature, maybe you can find the offending part by freezing it? Todd On Sat, Dec 13, 2014 at 1:46 PM, Poul-Henning Kamp p...@phk.freebsd.dk wrote: In message 20141213183546.ga27...@sol.ermione.com, Andrea Baldoni writes: Someone has the

Re: [volt-nuts] Datron 1281 calibration enable key

I did the same for my Datron 4700 and Valhalla 2724a. I took a picture of that ebay listing to the locksmith for a laugh. The lock on the 4700 came out easily once the outer threaded cap of the lock was removed. Todd Sent from my iPad On Dec 7, 2014, at 11:10, David C. Partridge

Re: [volt-nuts] Completion of LED Mod's for the Fluke 845AB 845AR Null Meter.

I have uploaded the mod file to the ko4bb ftp server. I could not find the AR or AB manuals so I also added them. Right now they are sitting in the Recent Uploads directory. Todd On Sun, Nov 23, 2014 at 10:31 PM, Dallas Smith dosm...@outlook.com wrote: Thank you, that will be fine. I'm

Re: [volt-nuts] Precision resistor testing

Andreas has a good thread on EEVblog http://www.eevblog.com/forum/projects/t-c-measurements-on-precision-resistors/ I am guessing that you want to calculate the alpha and beta coefficients over a certain temperature range? I am also interested in doing something similar, having collected

Re: [volt-nuts] Fluke 893 vs 895.........or other?

David, Congratulations on your new (to you) gear. I had typed a long drawn out response that was putting me to sleep. I decided to reduce it to a couple of paragraphs. The problem with testing / calibrating standards and references is that you need an even more accurate measurement system, a

Re: [volt-nuts] 732A rear panel battery connector

panel was removed. Todd On Tue, Oct 14, 2014 at 4:52 AM, acb...@gmx.de wrote: do you know what the part number is for the 7081 connector? I just purchased a 7071 and would need one. thanks Gesendet: Dienstag, 14. Oktober 2014 um 03:26 Uhr Von: Todd Micallef tmical...@gmail.com

Re: [volt-nuts] 732A rear panel battery connector

Randy, I had ordered the connectors from Fluke, but they do not come with the contacts. The best place to get one is from Kensington Electronics. They cost me $9.06 ea. back in March. The shipping costs were not included. Unfortunately, they have a minimum order and you would need to order about

Re: [volt-nuts] Banana jack probes for Fluke 8506A, etc.

How about the ones recommended for the 3458a? http://www.newark.com/agilent-technologies/34137a/test-lead-1kv/dp/01P1238 It is getting harder to find quality leads that fit a standard binding post. Todd Sent from my iPad On Oct 7, 2014, at 16:25, Mark Kahrs mark.ka...@gmail.com wrote:

Re: [volt-nuts] Solartron 7081 Calibration

I wonder if Ametek can be persuaded to release any official calibration / performance testing procedures if they are no longer supporting the 7081. Does any one here have any contacts at Ametek? Todd Sent from my iPad On Sep 28, 2014, at 12:14, J. L. Trantham jlt...@att.net wrote: I know

[volt-nuts] Fluke 732A pre-regulator revs

I wanted to pass on some information that may not have been previously discussed. I just finished working on a 732A with minor issues. I replaced the R10 and R20 pots on the A3 board just like on my other 732A's along with the two big caps C1 and C3. After performing the same battery charger

Re: [volt-nuts] Old HP3458A - SN: 2823A 03939

I have replaced a fan in one of my 3458A. I used this one ... http://www.digikey.com/product-detail/en/622L/381-2266-ND/1131198 I contacted ebm-papst with the original part number. They were not able to pull the original specs to offer a newer sub. I happened to notice it was made in West

Re: [volt-nuts] More grounding guarding references

http://www.hparchive.com/appnotes.htm http://www.analog.com/static/imported-files/application_notes/41727248AN_347.pdf Sent from my iPad On Sep 4, 2014, at 9:48, Dave Daniel kc0...@gmail.com wrote: Do you mean that they are on the web, or that they should be and you haven't found them,

Re: [volt-nuts] Fluke 732A battery module (and possible circuit replacement)

Mark, If you need any scans or measurements, let me know. I have one that will be disassembled for the next 24hrs. I can get this for you tomorrow evening before I replace the batteries. Todd Sent from my iPad On Aug 25, 2014, at 21:10, Mark Sims hol...@hotmail.com wrote: I have a 732A

Re: [volt-nuts] 732A and Prologix received

on the time - which is correct? For the moment, i am only concerned with stability. The need for absolute accuracy will come later. Randy On Fri, Aug 22, 2014 at 8:06 PM, Todd Micallef tmical...@gmail.com wrote: Randy, You have two possible choices. It can be configured with 4 x

Re: [volt-nuts] Looking for Datron 4000 series calibration key!

Chris, Where do you live? I just had some keys made last week for my Datron units. The first set fit my 4000A and 1071, but they did not fit my 4700. The 4000A key looked more like the pictures online, but the 4700 was completely different. Someone may have rekeyed or damaged the lock on the

Re: [volt-nuts] 732A drift

Randy, I looked at the 3458a input impedance, and it is difficult to get the meter set to the FixedZ (10M) mode. However, the 100v range is 10M. It should default to HiZ on reset. I forgot to mention to check the outputs and guard resistance to ground. One of my 732a had some foam baffling

Re: [volt-nuts] 732A drift

luck. Joe -Original Message- From: volt-nuts-boun...@febo.com [mailto:volt-nuts-boun...@febo.com] On Behalf Of Todd Micallef Sent: Saturday, August 23, 2014 4:13 AM To: Discussion of precise voltage measurement Subject: Re: [volt-nuts] 732A drift Randy, I looked

Re: [volt-nuts] 732A drift

Never mind. I tested it myself. You should be able to get the in cal led working without batteries. Todd On Sat, Aug 23, 2014 at 7:20 AM, Todd Micallef tmical...@gmail.com wrote: The output impedance of both the 1v outputs is ~1k ohm. I wonder if Randy could check the 3458a input impedance

Re: [volt-nuts] HP 3458A Mem test 1 hight. How do you read 32K memory chips?

John, Don't forget to measure your 5V power supply output. I doubt you are having a problem with it but the NVRAM write is disabled below a certain voltage (~4.25v) Todd On Wed, Aug 20, 2014 at 6:50 PM, acb...@gmx.de wrote: the easy way to read nvram through usb is a usb-programmer that has

Re: [volt-nuts] HP 3458A Mem test 1 hight. How do you read 32K memory chips?

: Thanks... I have been looking at the http://www.ebay.com/itm/Universal-EEPROM-Flash-SPI-BIOS-24-25-BR90-93-USB-Programmer-6000-CHIPS-SP8-B-/371031966902?pt=LH_DefaultDomain_0hash=item56633a84b6 Do you think that would do the chips? On Wed, Aug 20, 2014 at 4:25 PM, Todd Micallef tmical

Re: [volt-nuts] What's All This Low Thermal EMF Test Lead Stuff?

Stan, I have seen this Fluke book mentioned occasionally. I am not sure if has the tutorials that you seek. It is advertised as specific to dc/ lf ac. http://www.amazon.com/Calibration-Philosophy-Practice-Fluke-Corporation/dp/0963865005 Todd On Tue, Aug 19, 2014 at 7:35 PM, Stan Katz

Re: [volt-nuts] Fluke 732A themistor reading

Randy, Two of mine read in the 3.7-3.8K range, another reads in the 4.2K range. It is a good sign if the reading dropped in a few hours after turn-on. I believe the lower thermistor readings indicate the older 732A oven. Some minor changes were made and both manuals are available on Didier's

Re: [volt-nuts] Guildline 9578 / Solartron 7081 SchaffnerReplacement

Dave, Thanks for the heads up. I went ahead and verified that all pins matched the schematic by changing the cam to the four settings and all are as expected. The new cams have 230vac printed on them and the old one has 220 vac. I went ahead and installed the old one to prevent any future issues

Re: [volt-nuts] RE new 3458A

Randy, Do you mean that you can select it, but it won't give you a temperature? Or do you mean that you can't find it in the menu? If you go to the MENU option, select FULL or something like that. It should enable all the extra menus. If you can see it, I believe all you have to do is find it

Re: [volt-nuts] New HP3458A

Randy, I have had two 3458a that had bad front / rear switches. It was easy to determine during the calibration of the Cal 0 that failed. A copper short across both of the inputs, as per the calibration procedure, showed more than .5 ohm in 2-wire mode on the lowest range. The resistance was

Re: [volt-nuts] HP-419 and Fluke 845 Modifications

Randy, I am looking forward to your test results. Does your 845 have the separate board for the chopper amp as mentioned in the change/errata sheet dated 7/93? I have not seen any further documents from online sources that references this change. I have two AR models and it appears support for it

Re: [volt-nuts] HP3458A calibration memory backup

Mark, I am using the STMicroelectronics M48Z12 series in at least one of my 3458A's. I had trouble sourcing one of the two different memory modules from a reputable seller when I replaced my NVRAM. I purchased a DS1220 previously from Jameco and it died shortly afterward. The datecode on the

Re: [volt-nuts] Desperately seeking OPTION 10 for Datron 4708

Chris, I believe the current and resistance functions are on the same board. My 4700 is missing one board and it has both missing features. Todd Sent from my iPad On Jul 16, 2014, at 8:48, Chris caal...@gmail.com wrote: Thank you for the bad news :( I am starting to come to terms with the

Re: [volt-nuts] AC Voltage Measurement Standards

Ben, Do you have the 4921 Current Shunt Adapter option for the 4920? I have not found any information on it other than what is listed in the 4920 user's handbook. It mentions the unit simulates the impedance of a 540B. The guide says that the instructions are included with the 4921. Do you happen

Re: [volt-nuts] AC Voltage Measurement Standards

The remark about calibrating the resistors was merely an example of how I thought you may have been transferring the calibration of the 10V TVC. My first thought was that you compared the 10V TVC to the next closest model at fixed points. The inter-comparison would then continue from that model to

Re: [volt-nuts] 732b transformer replacement

Willy asked me to post this I just bought the battery pack on ebay for $700... that was me! Yes, the transformer and regulator board are OK and I have them powering the 732b right now! Can you put this message on volt-nuts for me? I can't figure out the process.. Thanks! Willy

Re: [volt-nuts] 732b transformer replacement

Sorry, Tom beat me to it, I was having trouble with my jems misspelling. On Wed, Jun 4, 2014 at 6:03 PM, Todd Micallef tmical...@gmail.com wrote: Willy, Have you contacted Fluke about getting a replacement transformer? I would guess it would cost a lot, but one of your other alternatives

Re: [volt-nuts] 732b transformer replacement

Willy, Have you contacted Fluke about getting a replacement transformer? I would guess it would cost a lot, but one of your other alternatives is to buy the external battery pack when it pops up on fleabay. The last one cost about $700, but I bought mine for less than that. That would give you