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

David: I will be guessing that you are discussing the lack of Q14 that is chassis mounted on some versions of A4, driven by Q13. I have sent you by PM a pdf of a 732A manual that I probably got from FLUKE. If you look at the schematic for A4 this one has the chassis mounted Q14 shown and

Re: [volt-nuts] Get 10K resistor calibrated in UK

Frans: Mine which was built in 1979, and corrected for the 1990 change in the ohm, and calibrated last in 2009 has drifted upwards by 1.61 ppm total. So about 0.054 ppm/year. I don't have any data from those 30 years so this is the beginning and end points. These all seem to have a spectacular

Re: [volt-nuts] Update on 720A

David: I had the same problem as you when I got my used 720A years ago. Both the "A" and "B" decade had a few resistors that had changed over the years. I don't think as bad as you experienced but still they would not balance within the range of the adjustment pots. So I "adjusted" those

Re: [volt-nuts] Update on 720A

David: Ignore my previous post. In thinking about this while out shopping this morning I know the answer. The output resistance of the 720A is about 66k ohms. Your voltmeter has an input resistance of 10 megohms. You are simply loading the output of the 720A. The reason that the 0.1

Re: [volt-nuts] Update on 720A

David: First suggestion would be to see what the output measures, with the input still set to 100.0014 volts (same as before), when setting the dials to: 0.9X(equivalent to setting the "A" decade to "0.1") 1.9X(equivalent to setting the "A" decade to

Re: [volt-nuts] Fluke 332B

David: The 332D and the 332B are identical except for the accuracy specs for the stability of the output voltages. 332B spec for 10 Volts is +/- .002% (20 ppm) for 90 days while the 332D spec for 10 Volts is +/- .001% (10 ppm) for 60 days. The monthly drift specs are also slightly

Re: [volt-nuts] Initial Turn-On Fluke 332D?

Good point. I have found that checking all the electrolytic caps on the PC Boards is a good idea. Many have failed over the years and the unit will not work properly, including oscillations on the output. Usually they have little or no capacitance. I have done this step to 4 units over the

Re: [volt-nuts] Initial Turn-On Fluke 332D?

Brooke: The 332D has no internal batteries, CPU or other internal memory. Accuracy is dependent upon the internal reference on the reference card and the adjustments of the first 3 decade resistors, the three range resistors, the reference resistor and the three zero range resistor

Re: [volt-nuts] Fluke DVMP Care Plan

Ken: I had my 732B calibrated at FLUKE in Everett WA last year. I had the Z540 with before and after data cal done. The price was $695 which included FLUKE shipping the 732B back to me, one day service. FLUKE wanted me to ship it to them overnight delivery by 10 AM which cost $250 UPS.

Re: [volt-nuts] fluke 731b battery pack

Eric: I have been using NiMH AA batteries in my 731B for at least 15 years now. I am sure that the specs say don't use them in a circuit designed for NiCd but I haven't had any problems with over heating or overcharging. You have to do some mods to the battery mounting to get them in there

Re: [volt-nuts] “A Solid-State Reference System”. Author: John R. Pickering

Alan: The best information I have ever been ever to dig up on this subject is contained in US patent #6,342,780. I will sent this to you by PM as well as trying to attach it to this post. Bill - Original Message - From: "Alan Ambrose" To:

Re: [volt-nuts] any voltnuts in the Chicagoland area?

Randy: Ok so does Morgan Hill qualify? Or is that too far away for you? Just kidding as usual. Bill - Original Message - From: "Randy Evans" To: "Discussion of precise voltage measurement" Sent: Thursday, October 01, 2015 8:18 AM

Re: [volt-nuts] 540b Arrival...........

David: Sounds like you got a good find. Clean, batteries hold a charge and has been updated by someone. The lithium batteries are probably the power for the modification that solves the problem that the Mercury Battery for the Reference Supply being "unobtainium" anymore. I have a pdf of

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

David: I just looked inside my 720A at the 20 turn 5K trimpots. They are Bourns 3005P-502 printed on them, cermets, standard 3/4", tempco 50 ppm. So the replacement is available directly from stock and nothing fancy. Mine are date code 8412 so my unit was built somewhere in the mid '80s.

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

David: Run the numbers. Assuming that the 5K-20 turn pot R1005 is set in the middle of it's travel (2.5K), that all of the other resistors, in series and parallel ( R1006,R1007,R1008 and R302), that make up one step of the "A" decade have a "0" TC, only R1005 has a maximum of +/- 100 ppm per

Re: [volt-nuts] Sometimes you just gotta gloat............

David: I don't suppose you would give us the address of this Equipment Surplus Center of yours I like those places where they don't have an IDEA of what they have and what it is worth!!! Great catch to say the least. At least you will have something to do for a while. What

Re: [volt-nuts] Test Leads

Randy: From my own experiences and what I have done over the years about low thermal leads. I have made my own leads from the Pomona #4892 double gold plated banana plugs along with using Pomona #5406 single gold plated banana plugs, where I needed to spread the leads futher apart than

Re: [volt-nuts] HP 3456A -3 Fault

Dave: These things are NOTORIOUS for filter cap failures in the power supplies. Check both the voltages and the RIPPLE on the various power supplies. It is not sufficent to just check the voltages. You must check the ripple with an o'scope. At least this is the first step before looking

Re: [volt-nuts] 845ab Led Mod Update

Sorry I should have said uv where ever I said mv. Too early in the morning where I live in the world. Bill - Original Message - From: Bill Gold wpgold3...@att.net To: Discussion of precise voltage measurement volt-nuts@febo.com Sent: Thursday, September 25, 2014 8:10 AM Subject: Re

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

TIA: Push blue key then blue R ( the shifted TRIG key) and ENTER. Then press the downarrow V key 4 times to get to the REV? on the display. Then press ENTER and two numbers will be displayed with a comma in the middle. The first number is the multimeter's master processor firmware revision.

Re: [volt-nuts] Fluke 5200A extender board.

Ken: I have a 5200 extender kit including the PC Board and the cables. In looking at it the center PC board that has the traces on it is enclosed on both sides with a piece of blank PC board material (no copper or traces) so you wind up with 3 ea 0.062 PC Boards riveted together. The center

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

, August 26, 2014 2:16 PM Subject: Re: [volt-nuts] 732A and Prologix received Bill, I measured the time between SMPL symbols with NPLC set to 1000 and it is approximately 33 seconds. It takes an hour to complete 100 readings. Randy On Mon, Aug 25, 2014 at 10:01 PM, Bill Gold wpgold3

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

seems oriented at programming automatic rather than manual measurements. Randy On Sun, Aug 24, 2014 at 4:46 PM, Bill Gold wpgold3...@att.net wrote: Randy: The MATH function is accessible from the keypad. I don't have an IEEE interface right now that works. You can also program

Re: [volt-nuts] Access to Volt-Nuts Web site

Randy: It doesn't work for me either. Same error message. Must be down for some reason. Time-Nuts is down also. Bill - Original Message - From: Randy Evans randyevans2...@gmail.com To: volt-nuts@febo.com Sent: Monday, August 25, 2014 7:28 AM Subject: [volt-nuts] Access to

Re: [volt-nuts] AC calibration

There is one more thing that enters into this discussion and that is reversal errors on the DC. The complicates the transfer somewhat. AC is always going + and -. DC is in one direction so you have to then reverse the voltage to the Thermal Transfer Standard and then take the average of the two

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

, Aug 24, 2014 at 4:46 PM, Bill Gold wpgold3...@att.net wrote: Randy: The MATH function is accessible from the keypad. I don't have an IEEE interface right now that works. You can also program the numeric keypad keys to have preprogrammed functions. DEFKEY I have made my own

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

outage and would not hold a charge after that. Todd On Sat, Aug 23, 2014 at 1:21 PM, Bill Gold wpgold3...@att.net wrote: Randy: I get 6 volt 4 amp/hr (or 4.5 amp/hr) batteries and they will fit perfect. Power Sonic PS-640, Genesis NP4-6, Panasonic LC-R064R5C and others

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

some better cables to make sure the errors are not due to thermals again. Randy On Sat, Aug 23, 2014 at 10:21 AM, Bill Gold wpgold3...@att.net wrote: Randy: I get 6 volt 4 amp/hr (or 4.5 amp/hr) batteries and they will fit perfect. Power Sonic PS-640, Genesis NP4-6, Panasonic LC

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

Randy: I get 6 volt 4 amp/hr (or 4.5 amp/hr) batteries and they will fit perfect. Power Sonic PS-640, Genesis NP4-6, Panasonic LC-R064R5C and others that are in this size and package. Order from one of the usual electronics distributors like Allied, Mouser, Digikey. This is a very common

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

When I removed the original NVRAM devices and then put in sockets, I plugged the original devices back in just to see if everything worked. Apparently some cal data was lost just desoldering the devices as I got error messages. It really didn't concern me as I intended to completely recal the

Re: [volt-nuts] HP 3458A Mem test 1 hight. How do youread 32K memorychips?

-nuts-boun...@febo.com] On Behalf Of Bill Gold Sent: Thursday, August 21, 2014 9:33 AM To: Discussion of precise voltage measurement Subject: Re: [volt-nuts] HP 3458A Mem test 1 hight. How do you read 32K memorychips? When I removed the original NVRAM devices and then put in sockets, I

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

John: I have replaced the 3 NVRAM devices in two different 3458A meters. I didn't do anything to the devices other than to install sockets to make future replacements easier when that issue comes up again. I did not program them or anything, just put the blank NVRAMS in and turned on the

Re: [volt-nuts] RE new 3458A

Randy: Look at page #23 of the 3458A Calibration Manual. Make yourself a 4 Terminal Short as shown and put it in as shown. Before I did an ACAL I had around -000.00025 mVDC. After ACAL I now read +000.2 mVDC. I did the CAL 0 myself so I would expect that the meter should return to

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

Randy: I have 6 ea Fluke 732A instruments. The results of being an over the edge and deeply obsessed Volt Nut, they just kept adding (reproducing?) over the years. My readings for the themistors range from 3.407K OHMS to 4.514K OHMS and all work just fine. 3.6K OHMS would seem just fine to

Re: [volt-nuts] A Fluke 732A: Return it or keep it?

Roy: I use a ( General Cement ) GC 8276 adjustment tool to make the pot adjustments in the 732A. I use the end that has the recessed metal blade. The pots are about 3.5 inches back from the front panel. It sometimes is very difficult to engage the tool slot in the pot. It helps to look

Re: [volt-nuts] What made a HP3458A so expensive

to 4E-12 with no additional calibration. Joe On 1/18/2014 3:37 PM, Tom Miller wrote: Can you imagine what it would cost to get that calibrated? Tom - Original Message - From: Bill Gold wpgold3...@att.net To: Discussion of precise voltage measurement volt-nuts@febo.com Sent: Saturday

Re: [volt-nuts] What made a HP3458A so expensive

In fact if you look at a 1982 HP catalog you will see that the 3456A was selling for around $3,700 and given inflation the 3458A is still a pretty good bargain when it was introduced in 1989. In 1989 the 3456A was selling for $4,600 while the 3458A was selling for $5,900. I wonder if there will

Re: [volt-nuts] Connector PN

Randy: The 3458A CLIP shows this connector as a Molex 22-17-2052. Looking on Molex this seems to be a current number. Mouser and Digikey don't have any stock. Alliedelect doesn't show anything. Good luck. Bill - Original Message - From: Randy Evans randallgrayev...@yahoo.com

Re: [volt-nuts] Connector PN

update The HP/AGILENT/KEYSIGHT P/N is 1251-6041 and is in stock at $5.13 ea. Bill - Original Message - From: Bill Gold wpgold3...@att.net To: Randy Evans randallgrayev...@yahoo.com; Discussion of precise voltage measurement volt-nuts@febo.com Sent: Thursday, January 16, 2014 7:17 AM

Re: [volt-nuts] Fluke 732A/AN Manual

Joe: Not to steal Todd's thunder but you can find these files on Didier's ftp site and you can download them from there until he gets a chance to place them on his regular website. I have already got them and they are just like the manual I have. Great job Todd! This is the first time I

Re: [volt-nuts] Fluke 732A Questions

Joe: A correction on the dropout voltage when the In Cal light goes out, I found my notes and it is 21 volts instead of 22 volts. The way I did this was to remove the battery pack, AC voltage and then just feed in a power supply where the battery pack would have delivered it's voltage to the

Re: [volt-nuts] Fluke 732A Questions

Message- From: volt-nuts-boun...@febo.com [mailto:volt-nuts-boun...@febo.com] On Behalf Of Bill Gold Sent: Monday, December 30, 2013 7:03 PM To: Discussion of precise voltage measurement Subject: Re: [volt-nuts] Fluke 732A Questions Joe: My 732A units vary in thermistor resistance

Re: [volt-nuts] Fluke 732B

Joe: The 731A and 731B were run at room temp and therefore were subject to room variations. They both use the same Reference Amplifier as the 732A B use. I have one 731B and it is amazingly stable for the room temp variations I experience at home. When I was working we had a 731B that

Re: [volt-nuts] Fluke 732B

Joe: Thanks for the upgrade, but they are only 732As not Bs. I got all of these at less than the going price of one 732B that recently sold on the infamous action site. Bill ___ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to

Re: [volt-nuts] Fluke 732B

Joe: That was a very interesting teardown of the 732B on eevblog. The one thing that this answered for me was if Fluke was using their Reference Amplifier in all of the 732B production and Fluke did. If you look at a paper by David Deaver called Predictability of Solid State

Re: [volt-nuts] (New to me) 3458A Trivia

Speaking of the 03458-66529 reference board added to the HP 3458A by Fluke (before Fluke offered the 8508A), has anyone ever seen a schematic of that board or how Fluke could rate that reference at 2 ppm? One person on this forum theorized that by lowering the operating temperature of the